Pub Date : 2025-03-04DOI: 10.1177/10567895251324595
Armin Raiesi, Mahsa Kharazi
In this paper, a new thermodynamically consistent model is presented for predicting the elastoplastic-damage behavior of ductile materials using the ordinary state-based peridynamic theory. The innovative idea of this paper lies in the definition of a damage variable for each material point to simulate deterioration. By coupling the newly defined damage variable with the elastoplastic formulation, the presented peridynamic model is capable of demonstrating the initiation and evolution of damage in ductile materials subjected to cyclic loading. In this paper, the consideration of damage is based on phenomenological aspects. To capture this phenomenon, suitable state variables and corresponding thermodynamical forces are defined and isotropic and kinematic hardenings are incorporated based on the equivalent plastic stretch. By defining a dissipation potential that adheres to the requirements of the second law of thermodynamics, the presented peridynamic constitutive model achieves its purpose and the evolution laws for internal variables are derived from the defined dissipation potential. The numerical results, obtained through the employed integration algorithm, demonstrate that the presented peridynamic elastoplastic-damage model can accurately predict the initiation and growth of damage. Furthermore, the model exhibits the capability to simulate the behavior of low cycle fatigue and accurately predict material fatigue failure.
{"title":"An elastoplastic-damage model based on nonlocal peridynamic theory for ductile damage analysis under cyclic loading","authors":"Armin Raiesi, Mahsa Kharazi","doi":"10.1177/10567895251324595","DOIUrl":"https://doi.org/10.1177/10567895251324595","url":null,"abstract":"In this paper, a new thermodynamically consistent model is presented for predicting the elastoplastic-damage behavior of ductile materials using the ordinary state-based peridynamic theory. The innovative idea of this paper lies in the definition of a damage variable for each material point to simulate deterioration. By coupling the newly defined damage variable with the elastoplastic formulation, the presented peridynamic model is capable of demonstrating the initiation and evolution of damage in ductile materials subjected to cyclic loading. In this paper, the consideration of damage is based on phenomenological aspects. To capture this phenomenon, suitable state variables and corresponding thermodynamical forces are defined and isotropic and kinematic hardenings are incorporated based on the equivalent plastic stretch. By defining a dissipation potential that adheres to the requirements of the second law of thermodynamics, the presented peridynamic constitutive model achieves its purpose and the evolution laws for internal variables are derived from the defined dissipation potential. The numerical results, obtained through the employed integration algorithm, demonstrate that the presented peridynamic elastoplastic-damage model can accurately predict the initiation and growth of damage. Furthermore, the model exhibits the capability to simulate the behavior of low cycle fatigue and accurately predict material fatigue failure.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"30 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546455","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 : 2025-02-26DOI: 10.1177/10567895251322708
Dongqiao Liu, Yunpeng Guo, Manchao He
This study investigates the damage evolution characteristics throughout the complete deformation process of rocks. The analysis reveals five distinct stages in the stress–strain curves of rocks: elastic recovery, damage retention, damage initiation, damage acceleration, and damage slowdown. To simulate the stress–strain relationship of rocks, a damage model based on logistic equation is proposed. The model is developed using the “elastic modulus method,” derived from the hypothesis of strain equivalence, and experimental data obtained from complete stress–strain curves of marble and quartzite under various confining pressures. The proposed model effectively captures the brittle fracture deformation of rocks under uniaxial compression, as well as the strain softening, brittle–ductile transformation, and strain hardening deformation behaviors of rocks under different confining pressures. It adopts a simple function form with distinct parameters derived from physical characteristics, enabling the description of both pre-peak and post-peak deformation characteristics of rocks. The theoretical results obtained from the model align well with existing experimental findings. The physical significance of the model parameters is discussed in relation to damage evolution and constitutive relations, affirming the rationality of the proposed model. Overall, the proposed model exhibits significant potential for broad application in rock engineering.
{"title":"A unified rock damage constitutive model under different confining pressures","authors":"Dongqiao Liu, Yunpeng Guo, Manchao He","doi":"10.1177/10567895251322708","DOIUrl":"https://doi.org/10.1177/10567895251322708","url":null,"abstract":"This study investigates the damage evolution characteristics throughout the complete deformation process of rocks. The analysis reveals five distinct stages in the stress–strain curves of rocks: elastic recovery, damage retention, damage initiation, damage acceleration, and damage slowdown. To simulate the stress–strain relationship of rocks, a damage model based on logistic equation is proposed. The model is developed using the “elastic modulus method,” derived from the hypothesis of strain equivalence, and experimental data obtained from complete stress–strain curves of marble and quartzite under various confining pressures. The proposed model effectively captures the brittle fracture deformation of rocks under uniaxial compression, as well as the strain softening, brittle–ductile transformation, and strain hardening deformation behaviors of rocks under different confining pressures. It adopts a simple function form with distinct parameters derived from physical characteristics, enabling the description of both pre-peak and post-peak deformation characteristics of rocks. The theoretical results obtained from the model align well with existing experimental findings. The physical significance of the model parameters is discussed in relation to damage evolution and constitutive relations, affirming the rationality of the proposed model. Overall, the proposed model exhibits significant potential for broad application in rock engineering.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"1 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506912","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 : 2025-02-14DOI: 10.1177/10567895251319408
George Z Voyiadjis, Peter I Kattan
A mathematical formulation incorporating the relationship between the damage tensor, healing tensor, and fabric tensors is presented. This formulation provides for a direct link between the subjects of Damage and Healing Mechanics using Fabric Tensors. A new damage-healing tensor is introduced that is based on the fabric of the material. This new tensor is pivotal in characterizing the micro-structure of the material, especially the distributions of micro-cracks and other micro defects. It is noted that the theory applies to linear elastic materials but can be generalized to other constitutive models incorporating inelastic behavior. As examples, the authors solve three cases, namely those of plane stress, plane strain, and isotropic elasticity. The case of plane stress assumes plane damage and plane healing as will be illustrated in the equations. Similarly, the case of plane strain is also illustrated. The case of isotropic elasticity assumes the presence of isotropic damage and isotropic healing. As an illustration, a numerical example is shown for a certain micro-crack distribution. Finally, experimental results are shown to illustrate the relationship between the fabric tensor parameters and the components of the damage and healing tensors. Finally, the evolution of damage and healing are discussed based on sound thermodynamic principles.
{"title":"Use of fabric tensors in damage and healing mechanics of materials","authors":"George Z Voyiadjis, Peter I Kattan","doi":"10.1177/10567895251319408","DOIUrl":"https://doi.org/10.1177/10567895251319408","url":null,"abstract":"A mathematical formulation incorporating the relationship between the damage tensor, healing tensor, and fabric tensors is presented. This formulation provides for a direct link between the subjects of Damage and Healing Mechanics using Fabric Tensors. A new damage-healing tensor is introduced that is based on the fabric of the material. This new tensor is pivotal in characterizing the micro-structure of the material, especially the distributions of micro-cracks and other micro defects. It is noted that the theory applies to linear elastic materials but can be generalized to other constitutive models incorporating inelastic behavior. As examples, the authors solve three cases, namely those of plane stress, plane strain, and isotropic elasticity. The case of plane stress assumes plane damage and plane healing as will be illustrated in the equations. Similarly, the case of plane strain is also illustrated. The case of isotropic elasticity assumes the presence of isotropic damage and isotropic healing. As an illustration, a numerical example is shown for a certain micro-crack distribution. Finally, experimental results are shown to illustrate the relationship between the fabric tensor parameters and the components of the damage and healing tensors. Finally, the evolution of damage and healing are discussed based on sound thermodynamic principles.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"10 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417739","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 : 2025-02-10DOI: 10.1177/10567895241305592
Claudio Findeisen, Jörg Hohe
Due to crack bridging effects, ceramic matrix composites (CMCs) have outstanding properties that combine a quasi-ductile material behaviour with the high-temperature properties of ceramics. Combined with their high specific strength, this makes them perfectly suitable for high temperature safety relevant components. In view of the design process of CMC components elaborated continuum damage models are required that most importantly consider their anisotropy and damage deactivation effects in a mechanically and mathematically consistent manner. With respect to their damage effect, most of the existing anisotropic models fail with regard to the damage growth criterion leading to the unphysical effect of an increasing stiffness due to damage. Motivated by the modelling process of initially anisotropic composite materials like CMCs, this paper presents the systematic formulation and validation of a mechanically consistent damage effect model together with crack closure effects.
{"title":"Mechanically consistent continuum damage model for anisotropic composites including damage deactivation","authors":"Claudio Findeisen, Jörg Hohe","doi":"10.1177/10567895241305592","DOIUrl":"https://doi.org/10.1177/10567895241305592","url":null,"abstract":"Due to crack bridging effects, ceramic matrix composites (CMCs) have outstanding properties that combine a quasi-ductile material behaviour with the high-temperature properties of ceramics. Combined with their high specific strength, this makes them perfectly suitable for high temperature safety relevant components. In view of the design process of CMC components elaborated continuum damage models are required that most importantly consider their anisotropy and damage deactivation effects in a mechanically and mathematically consistent manner. With respect to their damage effect, most of the existing anisotropic models fail with regard to the damage growth criterion leading to the unphysical effect of an increasing stiffness due to damage. Motivated by the modelling process of initially anisotropic composite materials like CMCs, this paper presents the systematic formulation and validation of a mechanically consistent damage effect model together with crack closure effects.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"160 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385607","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 : 2025-02-07DOI: 10.1177/10567895251314676
Jun Li, Xiaoman Feng, Junling Hou, Yaohua Liu, Binglei Wang
The paper investigates the issue of damage in interfacial materials using M-integral. It demonstrates that the integration path of M-integral can cross the material interface. The numerical calculation of M-integral is realized by using domain integral method. The accuracy of the model was verified using analytical solutions. The factors affecting the M-integral of the interfacial material are explored with the help of finite elements. The study explores the effects of elastic modulus ratio, defects, and load on the M-integral, and proposes an equivalent damage calibration method based on the M-integral. The results suggest that once the elastic modulus ratio exceeds a certain threshold, it is no longer the primary factor influencing the M-integral. The equivalent defect for elastic problems is linked to the original defect configuration and elastic modulus ratio, and is independent of the external load. This study is important for calibrating damage levels of interfacial materials, designing for damage tolerance in structures, and assessing integrity.
{"title":"Damage evaluation of interfacial materials based on M-integral","authors":"Jun Li, Xiaoman Feng, Junling Hou, Yaohua Liu, Binglei Wang","doi":"10.1177/10567895251314676","DOIUrl":"https://doi.org/10.1177/10567895251314676","url":null,"abstract":"The paper investigates the issue of damage in interfacial materials using M-integral. It demonstrates that the integration path of M-integral can cross the material interface. The numerical calculation of M-integral is realized by using domain integral method. The accuracy of the model was verified using analytical solutions. The factors affecting the M-integral of the interfacial material are explored with the help of finite elements. The study explores the effects of elastic modulus ratio, defects, and load on the M-integral, and proposes an equivalent damage calibration method based on the M-integral. The results suggest that once the elastic modulus ratio exceeds a certain threshold, it is no longer the primary factor influencing the M-integral. The equivalent defect for elastic problems is linked to the original defect configuration and elastic modulus ratio, and is independent of the external load. This study is important for calibrating damage levels of interfacial materials, designing for damage tolerance in structures, and assessing integrity.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"1 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143258429","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 : 2025-01-21DOI: 10.1177/10567895241313243
Qiuping Li, Jie Liu, Hao Wang
To effectively prevent dynamic gas disasters, the adding vertical and unloading radial stress were investigated in laboratory and numerical simulation experiments. The objective about the research was to ascertain how various gas pressures and loading rates affected permeability and damage deformation. The results conclude that shear failure predominates in gassy coal, a rise in loading rate causes the permeability to mutate more slowly, and the plastic strain gradually decreases at the yield, peak, and post-peak stable points in gassy coal. As well, a rise in gas pressure causes an earlier transition from compression to expansion state of specimens, enhances permeability, and rises the plastic strain at specified points. Furthermore, the study focuses on the meso-scale failure and permeability characteristics. During failure, the seepage channel within the coal body gradually transitions from a vertical orientation to irregular deformation. In addition, a damage model is formulated centered around energy consumption, demonstrating that damage evolution curves exhibit an ‘ S’ shape with vertical strain. Meanwhile, higher axial loading rates delay the onset of unstable crack propagation, but raising gas pressure quickens the pace of damage to specimens. The conclusions of this research hold significant practical implications for mitigating coal-rock gas dynamic disasters.
{"title":"Damage and permeability of gassy coal in loading – Unloading path","authors":"Qiuping Li, Jie Liu, Hao Wang","doi":"10.1177/10567895241313243","DOIUrl":"https://doi.org/10.1177/10567895241313243","url":null,"abstract":"To effectively prevent dynamic gas disasters, the adding vertical and unloading radial stress were investigated in laboratory and numerical simulation experiments. The objective about the research was to ascertain how various gas pressures and loading rates affected permeability and damage deformation. The results conclude that shear failure predominates in gassy coal, a rise in loading rate causes the permeability to mutate more slowly, and the plastic strain gradually decreases at the yield, peak, and post-peak stable points in gassy coal. As well, a rise in gas pressure causes an earlier transition from compression to expansion state of specimens, enhances permeability, and rises the plastic strain at specified points. Furthermore, the study focuses on the meso-scale failure and permeability characteristics. During failure, the seepage channel within the coal body gradually transitions from a vertical orientation to irregular deformation. In addition, a damage model is formulated centered around energy consumption, demonstrating that damage evolution curves exhibit an ‘ S’ shape with vertical strain. Meanwhile, higher axial loading rates delay the onset of unstable crack propagation, but raising gas pressure quickens the pace of damage to specimens. The conclusions of this research hold significant practical implications for mitigating coal-rock gas dynamic disasters.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"46 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992031","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}
In the highway construction of the southwestern Transverse Mountain area of China, mass mudstone engineering disasters have occurred, primarily attributed to engineering disturbances and water-rock interaction. Engineering disturbances commonly lead to varying degrees of pre-peak damage. To elucidate the evolutionary laws of strength in pre-peak damaged mudstone, we first defined the pre-peak damage variable ( Da) for mudstone, and through triaxial loading and unloading tests, obtained the mechanical characteristics of pre-peak damaged mudstone, analyzing its brittle properties from an energy perspective. Subsequently, through scanning electron microscopy tests, we analyzed the microstructural features to reveal the failure mechanism. Finally, the damage ratio strength theory (DR) was introduced to characterize the strength of the mudstone and validate the suitability of the DR. The results demonstrate that: (1) Mudstone with pre-peak damage exhibits a significant weakening effect due to water-rock interaction, with a maximum reduction in peak strength of approximately 28%. Compared to the loading stress path (LSP), the overall strength of the mudstone is lower under the unloading stress path (ULSP), and the deformation modulus decreases more significantly with Da under the ULSP. (2) Both the Daand confining pressure contribute to a decrease in the brittleness index of the mudstone. Under the ULSP, the mudstone is more prone to brittle failure. (3) The development of micro-cracks in pre-peak damaged mudstone makes it more susceptible to water infiltration, exacerbating the deteriorating effect of water-rock interaction, thus affecting its mechanical properties. (4) The DR can effectively characterize the strength of pre-peak damaged mudstone. The Damage Ratio (ν D,c) of mudstone under the LSP is in the range of 1.07∼1.50, and under the ULSP is in the range of 1.11∼1.52. The ν D,c under the LSP is smaller than under the ULSP, decreases with the Da, and exhibits plastic deformation, indicating that the DR can simultaneously characterize the strength and brittleness of the mudstone. The research results can provide guidance for the design parameters and disaster prevention of disturbed mudstone engineering.
{"title":"Study on mechanical properties and strength criterion of mudstone under loading and unloading considering pre-peak damage","authors":"Hui Qin, Hua Tang, Xiaotao Yin, Xu Cheng, Shengping Tang","doi":"10.1177/10567895241297327","DOIUrl":"https://doi.org/10.1177/10567895241297327","url":null,"abstract":"In the highway construction of the southwestern Transverse Mountain area of China, mass mudstone engineering disasters have occurred, primarily attributed to engineering disturbances and water-rock interaction. Engineering disturbances commonly lead to varying degrees of pre-peak damage. To elucidate the evolutionary laws of strength in pre-peak damaged mudstone, we first defined the pre-peak damage variable ( D<jats:sub>a</jats:sub>) for mudstone, and through triaxial loading and unloading tests, obtained the mechanical characteristics of pre-peak damaged mudstone, analyzing its brittle properties from an energy perspective. Subsequently, through scanning electron microscopy tests, we analyzed the microstructural features to reveal the failure mechanism. Finally, the damage ratio strength theory (DR) was introduced to characterize the strength of the mudstone and validate the suitability of the DR. The results demonstrate that: (1) Mudstone with pre-peak damage exhibits a significant weakening effect due to water-rock interaction, with a maximum reduction in peak strength of approximately 28%. Compared to the loading stress path (LSP), the overall strength of the mudstone is lower under the unloading stress path (ULSP), and the deformation modulus decreases more significantly with D<jats:sub>a</jats:sub> under the ULSP. (2) Both the D<jats:sub>a</jats:sub>and confining pressure contribute to a decrease in the brittleness index of the mudstone. Under the ULSP, the mudstone is more prone to brittle failure. (3) The development of micro-cracks in pre-peak damaged mudstone makes it more susceptible to water infiltration, exacerbating the deteriorating effect of water-rock interaction, thus affecting its mechanical properties. (4) The DR can effectively characterize the strength of pre-peak damaged mudstone. The Damage Ratio (ν <jats:sub>D,c</jats:sub>) of mudstone under the LSP is in the range of 1.07∼1.50, and under the ULSP is in the range of 1.11∼1.52. The ν <jats:sub>D,c</jats:sub> under the LSP is smaller than under the ULSP, decreases with the D<jats:sub>a</jats:sub>, and exhibits plastic deformation, indicating that the DR can simultaneously characterize the strength and brittleness of the mudstone. The research results can provide guidance for the design parameters and disaster prevention of disturbed mudstone engineering.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"12 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936733","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 : 2025-01-06DOI: 10.1177/10567895241297301
Feker Mnif, Guesmi Youssef, Rémy Larouche, Hatem Mrad, Sébastien Morin, Robert Poirier, Ahmed Koubaa
In the wood panel industry, metallic contaminants raise significant concerns, especially regarding the press plate's surface integrity, which requires a thorough inspection. This study investigated the effect of metallic contaminants on press plate damage and evaluated the use of infrared thermography (IRT) and infrared (IR) spectroscopy as non-destructive testing (NDT) methods for detecting these contaminants in wood panel manufacturing. Metallic contaminants embedded within lab-scale wood panels demonstrated their impact on the surface quality of both the press plate and the resulting panels. Moreover, confocal laser microscope analysis revealed that the surface roughness of the press plate surface was influenced by the specific alloy composition of contaminants, with steel and chromium contaminants exhibiting the more severe damage (e.g., mean roughness values of 59,80 and 84,64 μm, respectively). Thermography images exhibited the efficacy of IRT in detecting contaminants close to the surface of thin panels. However, an advanced camera is recommended for thicker panels and deeper contaminants to obtain a more accurate inspection. The Fourier-transform infrared spectroscopy (FTIR) evaluation revealed the presence of the metal-oxygen vibration band at approximately 668 cm−1 across all alloy compositions, suggesting its potential as a reliable reference for detecting metallic contaminants.
{"title":"Metallic contaminants in wood panel production process: Evaluating press plate damage and detecting potential using IR thermography and spectroscopy","authors":"Feker Mnif, Guesmi Youssef, Rémy Larouche, Hatem Mrad, Sébastien Morin, Robert Poirier, Ahmed Koubaa","doi":"10.1177/10567895241297301","DOIUrl":"https://doi.org/10.1177/10567895241297301","url":null,"abstract":"In the wood panel industry, metallic contaminants raise significant concerns, especially regarding the press plate's surface integrity, which requires a thorough inspection. This study investigated the effect of metallic contaminants on press plate damage and evaluated the use of infrared thermography (IRT) and infrared (IR) spectroscopy as non-destructive testing (NDT) methods for detecting these contaminants in wood panel manufacturing. Metallic contaminants embedded within lab-scale wood panels demonstrated their impact on the surface quality of both the press plate and the resulting panels. Moreover, confocal laser microscope analysis revealed that the surface roughness of the press plate surface was influenced by the specific alloy composition of contaminants, with steel and chromium contaminants exhibiting the more severe damage (e.g., mean roughness values of 59,80 and 84,64 μm, respectively). Thermography images exhibited the efficacy of IRT in detecting contaminants close to the surface of thin panels. However, an advanced camera is recommended for thicker panels and deeper contaminants to obtain a more accurate inspection. The Fourier-transform infrared spectroscopy (FTIR) evaluation revealed the presence of the metal-oxygen vibration band at approximately 668 cm<jats:sup>−1</jats:sup> across all alloy compositions, suggesting its potential as a reliable reference for detecting metallic contaminants.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"13 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142935157","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 : 2024-12-30DOI: 10.1177/10567895241302543
Yamato Hoshikawa, Kazuki Ryuzono, Sota Onodera, Yoshiaki Kawagoe, Tomonaga Okabe
Fiber-reinforced composites are essential in the aerospace industry, highlighting the need for an in-depth understanding of their durability. This study introduces a novel approach that integrates viscoelasticity and damage evolution based on continuum damage mechanics, employing finite element analysis. The method utilizes an anisotropic viscoelastic constitutive law to examine creep behavior under constant stress, decomposing stresses into equilibrium and non-equilibrium components. Moreover, it integrates a transverse crack damage variable associated with crack density. After solving stiffness equations, a detailed analysis of transverse crack propagation is conducted. This technique was applied to creep tests on carbon fiber-reinforced plastics and 3D woven ceramic matrix composites, resulting in strain and crack density profiles. The numerical simulations successfully reproduced experimental outcomes. The developed method offers a comprehensive tool for analyzing transverse crack propagation under viscoelastic creep conditions through finite element analysis, significantly enhancing design considerations by incorporating aspects of long-term durability.
{"title":"Finite element modeling of viscoelastic creep behavior and transverse cracking in fiber-reinforced composite materials","authors":"Yamato Hoshikawa, Kazuki Ryuzono, Sota Onodera, Yoshiaki Kawagoe, Tomonaga Okabe","doi":"10.1177/10567895241302543","DOIUrl":"https://doi.org/10.1177/10567895241302543","url":null,"abstract":"Fiber-reinforced composites are essential in the aerospace industry, highlighting the need for an in-depth understanding of their durability. This study introduces a novel approach that integrates viscoelasticity and damage evolution based on continuum damage mechanics, employing finite element analysis. The method utilizes an anisotropic viscoelastic constitutive law to examine creep behavior under constant stress, decomposing stresses into equilibrium and non-equilibrium components. Moreover, it integrates a transverse crack damage variable associated with crack density. After solving stiffness equations, a detailed analysis of transverse crack propagation is conducted. This technique was applied to creep tests on carbon fiber-reinforced plastics and 3D woven ceramic matrix composites, resulting in strain and crack density profiles. The numerical simulations successfully reproduced experimental outcomes. The developed method offers a comprehensive tool for analyzing transverse crack propagation under viscoelastic creep conditions through finite element analysis, significantly enhancing design considerations by incorporating aspects of long-term durability.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"35 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904782","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}
This study focused on understanding the fatigue response of anisotropic spherulitic polymers by employing a multiscale microscopic modeling approach. The crystal plasticity model together with the Arruda-Boyce model were used to describe the mechanical response of crystalline phase and amorphous. The fatigue behaviors and crack initiation were captured by Fatemi-Socie multiaxial criterion and continuous damage theory under multiaxial and non-proportional loading conditions. The sheaf-like structure of spherulitic polymers was considered to shed light on the anisotropic nature of fatigue failure. The results highlight the role of features of sheaf structure, e.g., initiation orientation, on the fatigue performance of spherulitic polymers, which have not been reported. The localized degradation of mechanical properties and the accumulation of fatigue damage were systematically discussed with various loading patterns. This study provided an in-depth understanding of potential fatigue mechanisms, offering robust support for fatigue resistance design in engineering applications.
{"title":"Micromechanical analysis of spherulitic polymers in multiaxial and non-proportional fatigue crack nucleation","authors":"Chenxu Jiang, Jia Zhou, Jiaxin Cui, Changqing Miao","doi":"10.1177/10567895241302873","DOIUrl":"https://doi.org/10.1177/10567895241302873","url":null,"abstract":"This study focused on understanding the fatigue response of anisotropic spherulitic polymers by employing a multiscale microscopic modeling approach. The crystal plasticity model together with the Arruda-Boyce model were used to describe the mechanical response of crystalline phase and amorphous. The fatigue behaviors and crack initiation were captured by Fatemi-Socie multiaxial criterion and continuous damage theory under multiaxial and non-proportional loading conditions. The sheaf-like structure of spherulitic polymers was considered to shed light on the anisotropic nature of fatigue failure. The results highlight the role of features of sheaf structure, e.g., initiation orientation, on the fatigue performance of spherulitic polymers, which have not been reported. The localized degradation of mechanical properties and the accumulation of fatigue damage were systematically discussed with various loading patterns. This study provided an in-depth understanding of potential fatigue mechanisms, offering robust support for fatigue resistance design in engineering applications.","PeriodicalId":13837,"journal":{"name":"International Journal of Damage Mechanics","volume":"12 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142887747","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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