Pub Date : 2025-10-31DOI: 10.1177/10567895251391013
Danni Luo, Zhikai Hu, Yi Shi, Jiann-Wen Woody Ju, Guoshao Su
The mechanical properties of rocks with different degrees of damage can affect the safety and stability of underground engineering projects, and their acoustic characteristics relevant to the analysis, prediction and early warnings of internal failure. In this study, uniaxial compression, biaxial compression, direct shear and Brazilian splitting tests of granite were performed, and the entire process of rock failure was monitored in real time by microseismic (MS), sound, and acoustic emission (AE) systems. The variations in granite strength and deformation characteristics under different stress states versus the initial damages in rock were studied, and the evolution characteristics of MS, sound, and AE signals of granite with different degrees of damage under various stress states were compared and analyzed. The results show that: (1) Under various stress states, granite strength significantly decreases with increasing initial damage, and the corresponding magnitude of each decrease in strength follows the order of Brazilian splitting strength > uniaxial compressive strength > shear strength > biaxial compressive strength. Moreover, as the initial damage increases, the failure characteristics tend to transform from brittle failure to ductile failure, and the compressive failure mode changes from tension-based failure to shear-based failure. (2) The evolution of the MS, sound, and AE signals of rock specimens with different degrees of damage generally exhibits significant differences when D > 0.37 and D < 0.37. (3) Based on the evolutionary characteristics of MS, sound and AE signals, precursor information about rock failure and the initial damage in rock can be obtained. In general, for rocks with different degrees of damage, MS signals provide the most abundant precursor information and criteria, followed by AE signals and sound signals. These differences are related to the differences in the signal frequency band, acquisition frequency, acquisition mode, and sensitivity of the three types of acoustic signals.
{"title":"Experimental study on the microseismic, sound, and acoustic emission characteristics of different damages in granites subjected to various loads","authors":"Danni Luo, Zhikai Hu, Yi Shi, Jiann-Wen Woody Ju, Guoshao Su","doi":"10.1177/10567895251391013","DOIUrl":"https://doi.org/10.1177/10567895251391013","url":null,"abstract":"The mechanical properties of rocks with different degrees of damage can affect the safety and stability of underground engineering projects, and their acoustic characteristics relevant to the analysis, prediction and early warnings of internal failure. In this study, uniaxial compression, biaxial compression, direct shear and Brazilian splitting tests of granite were performed, and the entire process of rock failure was monitored in real time by microseismic (MS), sound, and acoustic emission (AE) systems. The variations in granite strength and deformation characteristics under different stress states versus the initial damages in rock were studied, and the evolution characteristics of MS, sound, and AE signals of granite with different degrees of damage under various stress states were compared and analyzed. The results show that: (1) Under various stress states, granite strength significantly decreases with increasing initial damage, and the corresponding magnitude of each decrease in strength follows the order of Brazilian splitting strength > uniaxial compressive strength > shear strength > biaxial compressive strength. Moreover, as the initial damage increases, the failure characteristics tend to transform from brittle failure to ductile failure, and the compressive failure mode changes from tension-based failure to shear-based failure. (2) The evolution of the MS, sound, and AE signals of rock specimens with different degrees of damage generally exhibits significant differences when <jats:italic toggle=\"yes\">D</jats:italic> > 0.37 and <jats:italic toggle=\"yes\">D</jats:italic> < 0.37. (3) Based on the evolutionary characteristics of MS, sound and AE signals, precursor information about rock failure and the initial damage in rock can be obtained. In general, for rocks with different degrees of damage, MS signals provide the most abundant precursor information and criteria, followed by AE signals and sound signals. These differences are related to the differences in the signal frequency band, acquisition frequency, acquisition mode, and sensitivity of the three types of acoustic signals.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"1 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145412085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-28DOI: 10.1177/10567895251380211
Enmar Khalis, Larbi Boubchir, Boubaker Daachi
This paper comprehensively analyzes the artificial intelligence (AI) models that predict low-cycle fatigue life for an aluminum alloy, considering tension–compression and torsion–torsion experiments. The study highlights the crucial need for precise fatigue life predictions to ensure the reliability and safety of structures subjected to different cyclic loading conditions. By incorporating diverse loading scenarios, the aim is to develop AI models that surpass traditional approaches’ limitations, offering enhanced predictive capabilities. This work explores the potential of AI models for fatigue life prediction, focusing on bridging the gap between traditional learning and ensemble learning predictive techniques. Its analysis improves the understanding of fatigue and contributes to developing accurate and versatile predictive tools. The ensemble learning techniques that combine the strengths of different algorithms are targeted to assess their performance. Based on the methodology, the results provide a thorough explanation of the proposed AI models for normal and shear strain-controlled cyclic loading conditions. The impact of ensemble learning methods, LightGBM, XGBoost, CatBoost, extra trees, and nearest neighbors are investigated on the accuracy of fatigue life prediction. A comparative evaluation of these AI models in terms of their predictive capabilities in different strain scenarios is presented. This approach enhances the overall efficacy of the learning system by considering a host of perspectives and drawing on the strengths of diverse models.
{"title":"Ensemble learning-based artificial intelligence approaches for predicting low-cycle fatigue life for aluminum alloys","authors":"Enmar Khalis, Larbi Boubchir, Boubaker Daachi","doi":"10.1177/10567895251380211","DOIUrl":"https://doi.org/10.1177/10567895251380211","url":null,"abstract":"This paper comprehensively analyzes the artificial intelligence (AI) models that predict low-cycle fatigue life for an aluminum alloy, considering tension–compression and torsion–torsion experiments. The study highlights the crucial need for precise fatigue life predictions to ensure the reliability and safety of structures subjected to different cyclic loading conditions. By incorporating diverse loading scenarios, the aim is to develop AI models that surpass traditional approaches’ limitations, offering enhanced predictive capabilities. This work explores the potential of AI models for fatigue life prediction, focusing on bridging the gap between traditional learning and ensemble learning predictive techniques. Its analysis improves the understanding of fatigue and contributes to developing accurate and versatile predictive tools. The ensemble learning techniques that combine the strengths of different algorithms are targeted to assess their performance. Based on the methodology, the results provide a thorough explanation of the proposed AI models for normal and shear strain-controlled cyclic loading conditions. The impact of ensemble learning methods, LightGBM, XGBoost, CatBoost, extra trees, and nearest neighbors are investigated on the accuracy of fatigue life prediction. A comparative evaluation of these AI models in terms of their predictive capabilities in different strain scenarios is presented. This approach enhances the overall efficacy of the learning system by considering a host of perspectives and drawing on the strengths of diverse models.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"208 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145397496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-17DOI: 10.1177/10567895251380209
Zhao Zhang, Hang Huang, Heng Yang, Heng Li
Tubular titanium components have been widely used in advanced equipment in aerospace, marine, energy, and healthcare fields over the past decades. For commercial pure titanium (CP-Ti) tubes with hexagonal close-packed (HCP) crystal structure, the limited slip systems and the strong texture caused by multi-pass thermal–mechanical processing make the material always exhibit a strong anisotropy in damage evolution, which easily leads to early failure of components during forming processes. The accurate characterization and modeling of anisotropic damage evolution is a non-trivial issue for excavating the forming potential of materials. In this study, firstly, by taking the large-diameter thin-walled CP-Ti tube as a case material, the uniaxial tension tests along the 0°, 45°, and 90° directions, as well as the simple shear and plane strain tension tests, were designed and conducted to obtain the anisotropic plasticity and fracture behaviors. Then, by integrating a direction-dependent damage rate multiplier and the Hill'48 yield function into the Lode-parameter dependent Lemaitre (Lode-Lemaitre) damage model, the modified Lode-Lemaitre model was established, numerically implemented, and calibrated for the description of the anisotropic damage evolution of the CP-Ti tube. Finally, the prediction ability of the modified Lode-Lemaitre model was evaluated, and the damage evolution of the CP-Ti tube under various loading conditions was analyzed. The comparisons of the experimental and simulation results show that the prediction error of fracture displacement was reduced from 43.2% to 5.48%, and the wall thickness distribution of the Y-shaped tube was accurately predicted. These results prove that the modified Lode-Lemaitre model can accurately describe the anisotropic damage evolution of the CP-Ti tube.
{"title":"Characterization and modeling of anisotropic damage evolution for large-diameter thin-walled CP-Ti tube","authors":"Zhao Zhang, Hang Huang, Heng Yang, Heng Li","doi":"10.1177/10567895251380209","DOIUrl":"https://doi.org/10.1177/10567895251380209","url":null,"abstract":"Tubular titanium components have been widely used in advanced equipment in aerospace, marine, energy, and healthcare fields over the past decades. For commercial pure titanium (CP-Ti) tubes with hexagonal close-packed (HCP) crystal structure, the limited slip systems and the strong texture caused by multi-pass thermal–mechanical processing make the material always exhibit a strong anisotropy in damage evolution, which easily leads to early failure of components during forming processes. The accurate characterization and modeling of anisotropic damage evolution is a non-trivial issue for excavating the forming potential of materials. In this study, firstly, by taking the large-diameter thin-walled CP-Ti tube as a case material, the uniaxial tension tests along the 0°, 45°, and 90° directions, as well as the simple shear and plane strain tension tests, were designed and conducted to obtain the anisotropic plasticity and fracture behaviors. Then, by integrating a direction-dependent damage rate multiplier and the Hill'48 yield function into the Lode-parameter dependent Lemaitre (Lode-Lemaitre) damage model, the modified Lode-Lemaitre model was established, numerically implemented, and calibrated for the description of the anisotropic damage evolution of the CP-Ti tube. Finally, the prediction ability of the modified Lode-Lemaitre model was evaluated, and the damage evolution of the CP-Ti tube under various loading conditions was analyzed. The comparisons of the experimental and simulation results show that the prediction error of fracture displacement was reduced from 43.2% to 5.48%, and the wall thickness distribution of the Y-shaped tube was accurately predicted. These results prove that the modified Lode-Lemaitre model can accurately describe the anisotropic damage evolution of the CP-Ti tube.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"20 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145311118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-06DOI: 10.1177/10567895251380193
Abhik Sur, Sudip Mondal
The present work is devoted to study the thermoelastic interaction for a homogeneous thermoelastic rod, exposed to a moving heat source under the purview of hyperbolic two-temperature thermoelasticity. The constitutive relations for the present problem has been framed in the context of nonlocal elasticity theory taking into account the mechanical damage. The heat conduction equation in the present situation has been established taking into account the Moore–Gibson–Thompson generalized heat equation within a slipping interval on assimilating the memory-dependent derivative. The rod is assumed to be fixed at both ends and thermally insulated. The governing equations have been solved by the Laplace transform mechanism and in order to arrive at the solutions in real space–time domain, inversion of the Laplace transform has been performed using the method of Zakian. The computational results have been obtained for various values of damage parameter to reveal significant effect of various parameters such as hyperbolic two-temperature parameter, classical two-temperature parameter, various kernel function, nonlocal parameter and the time delay also. Various comparative studies have been performed to analyze the impact of damage on each physical fields. Moreover, a comparative study between hyperbolic two-temperature theory and one-temperature theory is also carried out.
{"title":"Computational assessment of mechanical damage in a thermoelastic rod under hyperbolic two-temperature theory with nonlocal and memory effects","authors":"Abhik Sur, Sudip Mondal","doi":"10.1177/10567895251380193","DOIUrl":"https://doi.org/10.1177/10567895251380193","url":null,"abstract":"The present work is devoted to study the thermoelastic interaction for a homogeneous thermoelastic rod, exposed to a moving heat source under the purview of hyperbolic two-temperature thermoelasticity. The constitutive relations for the present problem has been framed in the context of nonlocal elasticity theory taking into account the mechanical damage. The heat conduction equation in the present situation has been established taking into account the Moore–Gibson–Thompson generalized heat equation within a slipping interval on assimilating the memory-dependent derivative. The rod is assumed to be fixed at both ends and thermally insulated. The governing equations have been solved by the Laplace transform mechanism and in order to arrive at the solutions in real space–time domain, inversion of the Laplace transform has been performed using the method of Zakian. The computational results have been obtained for various values of damage parameter to reveal significant effect of various parameters such as hyperbolic two-temperature parameter, classical two-temperature parameter, various kernel function, nonlocal parameter and the time delay also. Various comparative studies have been performed to analyze the impact of damage on each physical fields. Moreover, a comparative study between hyperbolic two-temperature theory and one-temperature theory is also carried out.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"33 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-29DOI: 10.1177/10567895251380239
Shakir Hussain Chaudhry, Pu Xue, Ameer S Zirjawi
Composite T-joint application as a stiffener is a conjoint aspect in many thin-shell aero-structures; however, these structures are often prone to low-velocity impacts that can drastically reduce their load-carrying capacity. This article implements a new effective approach to determine damage sensitivity and progression. The first part includes a detailed assessment of the three-dimensional (3D) stress status and the result shows that the shear stresses substantially influence the deltoid matrix failure and skin-stiffener debonding. In the second part, a high-fidelity 3D damage model, with a modified damage initiation failure criterion based on Hashin and Puck is implemented via ABAQUS/EXPLICIT VUMAT user-subroutine. The intralaminar damage model considers 3D stress states and continuous stiffness degradation theory while for interlaminar failure, the cohesive-zone method based on bi-linear traction separation law is used. The mechanical response, as well as the intralaminar and interlaminar damage predicted by the model, shows a good correlation with the experimental findings. The results model shows a maximum error of 8% in the case of load versus time and a maximum error of 2.5% in the case of energy absorbed with the experimental results. Overall, the impact behavior of integrated composite structures can be effectively predicted using the recommended method.
{"title":"A 3D failure criterion for damage assessment in composite T-joints under complex multiaxial stress status","authors":"Shakir Hussain Chaudhry, Pu Xue, Ameer S Zirjawi","doi":"10.1177/10567895251380239","DOIUrl":"https://doi.org/10.1177/10567895251380239","url":null,"abstract":"Composite T-joint application as a stiffener is a conjoint aspect in many thin-shell aero-structures; however, these structures are often prone to low-velocity impacts that can drastically reduce their load-carrying capacity. This article implements a new effective approach to determine damage sensitivity and progression. The first part includes a detailed assessment of the three-dimensional (3D) stress status and the result shows that the shear stresses substantially influence the deltoid matrix failure and skin-stiffener debonding. In the second part, a high-fidelity 3D damage model, with a modified damage initiation failure criterion based on Hashin and Puck is implemented via ABAQUS/EXPLICIT VUMAT user-subroutine. The intralaminar damage model considers 3D stress states and continuous stiffness degradation theory while for interlaminar failure, the cohesive-zone method based on bi-linear traction separation law is used. The mechanical response, as well as the intralaminar and interlaminar damage predicted by the model, shows a good correlation with the experimental findings. The results model shows a maximum error of 8% in the case of load versus time and a maximum error of 2.5% in the case of energy absorbed with the experimental results. Overall, the impact behavior of integrated composite structures can be effectively predicted using the recommended method.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"114 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145188783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-25DOI: 10.1177/10567895251380244
Suchart Limkatanyu, Worathep Sae-Long, Nattapong Damrongwiriyanupap, Piti Sukontasukkul, Griengsak Kaewkulchai, Hamid M Sedighi, Hexin Zhang
This study proposes a new beam–foundation model for analyzing the static behavior of recycled aggregate concrete (RAC) beam resting on Kerr-type foundations. The novelty of the approach lies in the integration of three distinct damage models—the Voigt parallel model, the Reuss serial model, and the generalized self-consistent model—into a force-based framework. These models are employed to capture stiffness degradation in RAC beams under isotropic and homogeneous conditions, addressing the need for more realistic damage representation in sustainable concrete structures. The Kerr-type foundation model accounts for interaction between the beam and its underlying foundation, while the Euler–Bernoulli beam theory governs the beam's deformation behavior under small displacements. The governing equations are formulated using the virtual force principle. Through a series of numerical simulations, the study investigates how damage mechanisms and system parameters influence the bending response of the RAC beam–foundation system. The results demonstrate that both the type of damage model and foundation characteristics significantly affect the structural stiffness, leading to either softening or stiffening responses.
{"title":"Stiffness degradation analysis of recycled aggregate concrete beam on Kerr-type foundation: Force-based approach","authors":"Suchart Limkatanyu, Worathep Sae-Long, Nattapong Damrongwiriyanupap, Piti Sukontasukkul, Griengsak Kaewkulchai, Hamid M Sedighi, Hexin Zhang","doi":"10.1177/10567895251380244","DOIUrl":"https://doi.org/10.1177/10567895251380244","url":null,"abstract":"This study proposes a new beam–foundation model for analyzing the static behavior of recycled aggregate concrete (RAC) beam resting on Kerr-type foundations. The novelty of the approach lies in the integration of three distinct damage models—the Voigt parallel model, the Reuss serial model, and the generalized self-consistent model—into a force-based framework. These models are employed to capture stiffness degradation in RAC beams under isotropic and homogeneous conditions, addressing the need for more realistic damage representation in sustainable concrete structures. The Kerr-type foundation model accounts for interaction between the beam and its underlying foundation, while the Euler–Bernoulli beam theory governs the beam's deformation behavior under small displacements. The governing equations are formulated using the virtual force principle. Through a series of numerical simulations, the study investigates how damage mechanisms and system parameters influence the bending response of the RAC beam–foundation system. The results demonstrate that both the type of damage model and foundation characteristics significantly affect the structural stiffness, leading to either softening or stiffening responses.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"23 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Effective concrete breaking is a challenge for concrete recycling engineering. Macroscopic and microscopic tests were conducted to explore the thermal damage evolution of concrete under microwave irradiation in this paper. Uniaxial compressive strength test was employed to investigate the impact of microwave irradiation on concrete macroscopic mechanical. Concurrently, scanning electron microscopy test, X-Ray diffraction analysis, and computed tomography scan test were utilized to investigate microstructure evolution and chemical content variation. The results show that the response of basalt aggregate to microwaves was stronger than that of the mortar, resulting in thermal gradient stress between them, leading to interface debonding and concrete damage. Within the temperature range of 100°C–300°C, the water liberated by AFt (Ettringite) hydrolysis evaporated in conjunction with the free water within the concrete, leading to the increment of porosity and rapid growth of cracks. Within 300°C–500°C, CH and C-S-H decomposed, which causes internal crack propagation. A main fracture zone was formed in concrete after sufficient power input, creating a zone of concentrated damage. The fracture mainly occurred and propagated at aggregate–mortar interface. The study can provide a reference for the application of microwave-assisted concrete breaking.
混凝土有效破碎是混凝土回收利用工程面临的挑战。通过宏观和微观试验研究了微波辐照下混凝土的热损伤演化过程。采用单轴抗压强度试验研究了微波辐照对混凝土宏观力学性能的影响。同时，利用扫描电镜、x射线衍射分析和计算机断层扫描测试对其微观结构演变和化学成分变化进行了研究。结果表明：玄武岩骨料对微波的响应强于砂浆，两者之间产生热梯度应力，导致界面脱落，混凝土损伤；在100°C - 300°C的温度范围内，AFt（钙矾石）水解释放的水与混凝土内部的自由水一起蒸发，导致孔隙率增加，裂缝快速增长。在300℃- 500℃范围内，CH和C- s - h发生分解，导致内部裂纹扩展。足够的功率输入后，混凝土内部形成主断裂带，形成集中破坏区。断裂主要发生和扩展在骨料-砂浆界面。研究结果可为微波辅助混凝土破碎的应用提供参考。
{"title":"Microwave assisted concrete breakage: The viewpoint on analysing concrete thermal and mechanical behaviour","authors":"Wei Wei, Xing wang Chen, Zhenyang Zong, Rujia Qiao, Qian Geng","doi":"10.1177/10567895251380241","DOIUrl":"https://doi.org/10.1177/10567895251380241","url":null,"abstract":"Effective concrete breaking is a challenge for concrete recycling engineering. Macroscopic and microscopic tests were conducted to explore the thermal damage evolution of concrete under microwave irradiation in this paper. Uniaxial compressive strength test was employed to investigate the impact of microwave irradiation on concrete macroscopic mechanical. Concurrently, scanning electron microscopy test, X-Ray diffraction analysis, and computed tomography scan test were utilized to investigate microstructure evolution and chemical content variation. The results show that the response of basalt aggregate to microwaves was stronger than that of the mortar, resulting in thermal gradient stress between them, leading to interface debonding and concrete damage. Within the temperature range of 100°C–300°C, the water liberated by AFt (Ettringite) hydrolysis evaporated in conjunction with the free water within the concrete, leading to the increment of porosity and rapid growth of cracks. Within 300°C–500°C, CH and C-S-H decomposed, which causes internal crack propagation. A main fracture zone was formed in concrete after sufficient power input, creating a zone of concentrated damage. The fracture mainly occurred and propagated at aggregate–mortar interface. The study can provide a reference for the application of microwave-assisted concrete breaking.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"102 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-19DOI: 10.1177/10567895251380199
Hou Huiming, Yan Chong, Zhao Linshuang
In present work, a new microcrack-based anisotropic damage model is proposed for initially anisotropic rocks, such as sedimentary rock. A second-order damage tensor is adopted to represent the density and direction of the microcracks. The anisotropic mechanical damage evolution law is determined by the propagation of microcracks. Local tensile stress and linear elastic fracture mechanics are used to describe the propagation of microcrack. The orientation of bedding plane is also taken into account in damage evolution equation. The constitutive equations are developed by considering the coupling effects between the inherent and induced anisotropies. The model parameters can be determined by triaxial compression tests of rocks with different bedding orientations. The proposed model is applied to describe the mechanical behavior of a typical sedimentary rock. The experimental and simulated results are in good agreement. The model can capture the general anisotropic behavior and damage properties of the initially anisotropic rocks. Due to the crack-controlled model, snap-back behavior in the early softening regime is also captured.
{"title":"A microcrack-based continuum damage model for initially anisotropic sedimentary rocks","authors":"Hou Huiming, Yan Chong, Zhao Linshuang","doi":"10.1177/10567895251380199","DOIUrl":"https://doi.org/10.1177/10567895251380199","url":null,"abstract":"In present work, a new microcrack-based anisotropic damage model is proposed for initially anisotropic rocks, such as sedimentary rock. A second-order damage tensor is adopted to represent the density and direction of the microcracks. The anisotropic mechanical damage evolution law is determined by the propagation of microcracks. Local tensile stress and linear elastic fracture mechanics are used to describe the propagation of microcrack. The orientation of bedding plane is also taken into account in damage evolution equation. The constitutive equations are developed by considering the coupling effects between the inherent and induced anisotropies. The model parameters can be determined by triaxial compression tests of rocks with different bedding orientations. The proposed model is applied to describe the mechanical behavior of a typical sedimentary rock. The experimental and simulated results are in good agreement. The model can capture the general anisotropic behavior and damage properties of the initially anisotropic rocks. Due to the crack-controlled model, snap-back behavior in the early softening regime is also captured.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"11 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145089627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-08DOI: 10.1177/10567895251375352
Yuhan Tang, Yuedong Wang, Yonghua Li, Tao Guo, Qiyu An, Qi Dong
The fatigue failure of the rail vehicle bogie frame is primarily attributed to nonlinear fatigue damage under complex loading conditions. As one of the key technologies for promoting digitization in the field of rail transport, the related studies focusing on nonlinear fatigue damage assessment of the bogie frame based on a digital twin are being developed. In response to this case, a five-dimensional digital twin model of the bogie frame with a new approach for accumulation fatigue damage is established. To enhance the accuracy of the fatigue damage assessment in the digital twin model, an improved Manson–Halford nonlinear cumulative analytical model is presented based on the analogy between the decomposition of organic matter in ecology and the degradation of mechanical properties of materials. Additionally, to boost the efficiency of mapping between the physical entity and the virtual entity based on physical programming and particle swarm optimization. The proposed digital twin model uniquely merges data-driven and mechanics-driven methodologies, offering a robust solution for the structural design and durability optimization of the bogie frame.
{"title":"A five-dimensional digital twin model of bogie frame with a new approach for accumulation fatigue damage","authors":"Yuhan Tang, Yuedong Wang, Yonghua Li, Tao Guo, Qiyu An, Qi Dong","doi":"10.1177/10567895251375352","DOIUrl":"https://doi.org/10.1177/10567895251375352","url":null,"abstract":"The fatigue failure of the rail vehicle bogie frame is primarily attributed to nonlinear fatigue damage under complex loading conditions. As one of the key technologies for promoting digitization in the field of rail transport, the related studies focusing on nonlinear fatigue damage assessment of the bogie frame based on a digital twin are being developed. In response to this case, a five-dimensional digital twin model of the bogie frame with a new approach for accumulation fatigue damage is established. To enhance the accuracy of the fatigue damage assessment in the digital twin model, an improved Manson–Halford nonlinear cumulative analytical model is presented based on the analogy between the decomposition of organic matter in ecology and the degradation of mechanical properties of materials. Additionally, to boost the efficiency of mapping between the physical entity and the virtual entity based on physical programming and particle swarm optimization. The proposed digital twin model uniquely merges data-driven and mechanics-driven methodologies, offering a robust solution for the structural design and durability optimization of the bogie frame.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"69 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145017273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-19DOI: 10.1177/10567895251365631
Yihao Ren, Bao Qin, Zheng Zhong
Once sulfate ions enter a concrete structure, they can react with multiple aluminate phases within the concrete to form ettringite, which eventually leads to swelling and cracking of the structure. To reveal the mechanism of external sulfate attack (ESA), a fully coupled nonlinear constitutive model is developed for transient diffusion-reaction-deformation response of concrete exposed to sulfate environment, by introducing the concentration of sulfate diffusion and the extents of multiple sulfate reactions as independent variables to characterize their respective contributions to free energy and volume expansion. In addition, a structural damage function is incorporated to measure the effect of ESA on elastic constants and diffusion coefficient of concrete. Specially, multiple reaction kinetics equations are established to satisfy the dissipation inequality, which depend not only on the concentrations of the species involved, but also on the stress. The model is then validated by comparing with the experimental results of one-dimensional sulfate attack, and numerical examples are used to illustrate the competing mechanisms between multiple reaction pathways and the interaction between chemical reactions and mechanical loading.
{"title":"Modeling of concrete under external sulfate attack considering the effect of multiple chemical reactions","authors":"Yihao Ren, Bao Qin, Zheng Zhong","doi":"10.1177/10567895251365631","DOIUrl":"https://doi.org/10.1177/10567895251365631","url":null,"abstract":"Once sulfate ions enter a concrete structure, they can react with multiple aluminate phases within the concrete to form ettringite, which eventually leads to swelling and cracking of the structure. To reveal the mechanism of external sulfate attack (ESA), a fully coupled nonlinear constitutive model is developed for transient diffusion-reaction-deformation response of concrete exposed to sulfate environment, by introducing the concentration of sulfate diffusion and the extents of multiple sulfate reactions as independent variables to characterize their respective contributions to free energy and volume expansion. In addition, a structural damage function is incorporated to measure the effect of ESA on elastic constants and diffusion coefficient of concrete. Specially, multiple reaction kinetics equations are established to satisfy the dissipation inequality, which depend not only on the concentrations of the species involved, but also on the stress. The model is then validated by comparing with the experimental results of one-dimensional sulfate attack, and numerical examples are used to illustrate the competing mechanisms between multiple reaction pathways and the interaction between chemical reactions and mechanical loading.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"25 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144899920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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