Pub Date : 2022-05-21DOI: 10.1142/s1756973722500019
Liang Dong, Xiong Sang, Wu Hao
ABAQUS was used to simulate the laminated Cu cladding Fe sheet during cold rolling, combining theoretical calculations, and the orthogonal test method was adopted. Meanwhiles, the rolling stress was taken as a consideration index to investigate the cold rolling processing rate, rolling speed, friction factor (upper roller), and friction factor (lower roller) 4, the best process parameters of layered metal copper/steel cold-rolled composite are selected. The results show that the cold-rolling processing rate is 52%, the rolling speed is 75 m/min, and the roller friction factor is 0.2 is the best process parameter. At this time, the rolling stress is small, and the bonding quality is the best. Cu cladding Fe sheet of the above-mentioned production process was taken into annealing experiments, SEM and an energy spectrometer were applied to photograph the surface morphology and the element distribution. The interface thickness was calculated by the diffusion distance of Fe and Cu elements, and the interface morphology and mechanical properties were combined for judgment. The results show that the annealing temperature is [Formula: see text]C and the bonding condition is the best under the condition of 4[Formula: see text]h heat preservation.
{"title":"Finite Element Simulation and Experiments of Laminated Cu Cladding Fe Sheet During Cold Rolling Bonding","authors":"Liang Dong, Xiong Sang, Wu Hao","doi":"10.1142/s1756973722500019","DOIUrl":"https://doi.org/10.1142/s1756973722500019","url":null,"abstract":"ABAQUS was used to simulate the laminated Cu cladding Fe sheet during cold rolling, combining theoretical calculations, and the orthogonal test method was adopted. Meanwhiles, the rolling stress was taken as a consideration index to investigate the cold rolling processing rate, rolling speed, friction factor (upper roller), and friction factor (lower roller) 4, the best process parameters of layered metal copper/steel cold-rolled composite are selected. The results show that the cold-rolling processing rate is 52%, the rolling speed is 75 m/min, and the roller friction factor is 0.2 is the best process parameter. At this time, the rolling stress is small, and the bonding quality is the best. Cu cladding Fe sheet of the above-mentioned production process was taken into annealing experiments, SEM and an energy spectrometer were applied to photograph the surface morphology and the element distribution. The interface thickness was calculated by the diffusion distance of Fe and Cu elements, and the interface morphology and mechanical properties were combined for judgment. The results show that the annealing temperature is [Formula: see text]C and the bonding condition is the best under the condition of 4[Formula: see text]h heat preservation.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41328191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-21DOI: 10.1142/s175697372146001x
Dingkun Pi, A. Ermakova, A. Mehmanparast
With the advancements in additive manufacturing (AM) technologies, it is expected that fast and efficient production using the AM techniques will gradually replace the traditional manufacturing processes. An important consideration in the design and life assessment of AM-built parts is the asset integrity management and in particular fatigue life enhancement of such components. Surface rolling treatment is known to be an efficient way to introduce deep compressive residual stresses into engineering components, and therefore it has been considered as a practical and effective life enhancement technology. In this study, the surface rolling effects on the fatigue life enhancement of wire arc additively manufactured (WAAM) parts have been investigated. For this purpose, a compact tension specimen geometry was modeled in ABAQUS and the rolling process was simulated by means of finite element simulations to predict the extent of compressive residual stresses induced into a WAAM built part. The simulation results have been discussed in terms of the beneficial effects of surface rolling on fatigue life enhancement of WAAM built parts.
{"title":"Numerical Analysis of Surface Rolling Effects on Fatigue Life Enhancement of Wire Arc Additively Manufactured Parts","authors":"Dingkun Pi, A. Ermakova, A. Mehmanparast","doi":"10.1142/s175697372146001x","DOIUrl":"https://doi.org/10.1142/s175697372146001x","url":null,"abstract":"With the advancements in additive manufacturing (AM) technologies, it is expected that fast and efficient production using the AM techniques will gradually replace the traditional manufacturing processes. An important consideration in the design and life assessment of AM-built parts is the asset integrity management and in particular fatigue life enhancement of such components. Surface rolling treatment is known to be an efficient way to introduce deep compressive residual stresses into engineering components, and therefore it has been considered as a practical and effective life enhancement technology. In this study, the surface rolling effects on the fatigue life enhancement of wire arc additively manufactured (WAAM) parts have been investigated. For this purpose, a compact tension specimen geometry was modeled in ABAQUS and the rolling process was simulated by means of finite element simulations to predict the extent of compressive residual stresses induced into a WAAM built part. The simulation results have been discussed in terms of the beneficial effects of surface rolling on fatigue life enhancement of WAAM built parts.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46787714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-23DOI: 10.1142/s1756973722500020
D. Bhattacharya, P. Purkait, M. Kanoria
{"title":"Memory Response on the Elasto-Thermodiffusive Interaction Subjected to Harmonically Varying Heat Source","authors":"D. Bhattacharya, P. Purkait, M. Kanoria","doi":"10.1142/s1756973722500020","DOIUrl":"https://doi.org/10.1142/s1756973722500020","url":null,"abstract":"","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43454877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-23DOI: 10.1142/s1756973722500032
T. Ino, Yohei Sonobe, Atsuhiro Koyama, A. Saimoto, Md. Abdul Hasib
{"title":"2D Stress Analysis of an Infinite Plate with Orthotropic Inclusions by Embedding Continuous Force Doublet","authors":"T. Ino, Yohei Sonobe, Atsuhiro Koyama, A. Saimoto, Md. Abdul Hasib","doi":"10.1142/s1756973722500032","DOIUrl":"https://doi.org/10.1142/s1756973722500032","url":null,"abstract":"","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47169296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-25DOI: 10.1142/s1756973721440066
Chen Ling, J. Nguejio, Riccardo Manno, L. St-Pierre, F. Barbe, I. Benedetti
Lattice materials, such as honeycombs, are remarkable in their ability to combine high stiffness, strength and toughness at low density. In addition, the recent and pervasive development of additive manufacturing technologies makes it easier to produce these cellular materials and opens new possibilities to improve their properties by implementing small modifications to their microstructure. Such developments open new opportunities towards the design of new classes of architectured materials. For example, recent computational studies have shown that honeycombs with lattice density gradients have a fracture energy under tensile loading up to 50% higher than their uniform counterparts. The aim of this study is to provide experimental evidence for these promising numerical results. To achieve this, single-edge notched tension specimens, with a honeycomb lattice structures, were manufactured by stereolithography using a ductile polymer resin. The performances of three different honeycombs were compared: (i) a uniform sparse lattice, (ii) a uniform dense lattice, and (iii) a gradient lattice with alternating bands of sparse and dense lattices. The results indicated that specimens with a density gradient may achieve a work of fracture per unit volume that is up to 79% higher than that of a uniform lattice.
{"title":"Fracture of Honeycombs Produced by Additive Manufacturing","authors":"Chen Ling, J. Nguejio, Riccardo Manno, L. St-Pierre, F. Barbe, I. Benedetti","doi":"10.1142/s1756973721440066","DOIUrl":"https://doi.org/10.1142/s1756973721440066","url":null,"abstract":"Lattice materials, such as honeycombs, are remarkable in their ability to combine high stiffness, strength and toughness at low density. In addition, the recent and pervasive development of additive manufacturing technologies makes it easier to produce these cellular materials and opens new possibilities to improve their properties by implementing small modifications to their microstructure. Such developments open new opportunities towards the design of new classes of architectured materials. For example, recent computational studies have shown that honeycombs with lattice density gradients have a fracture energy under tensile loading up to 50% higher than their uniform counterparts. The aim of this study is to provide experimental evidence for these promising numerical results. To achieve this, single-edge notched tension specimens, with a honeycomb lattice structures, were manufactured by stereolithography using a ductile polymer resin. The performances of three different honeycombs were compared: (i) a uniform sparse lattice, (ii) a uniform dense lattice, and (iii) a gradient lattice with alternating bands of sparse and dense lattices. The results indicated that specimens with a density gradient may achieve a work of fracture per unit volume that is up to 79% higher than that of a uniform lattice.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42594621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-01DOI: 10.1142/s1756973722020012
L. Rodríguez-Tembleque, J. Sanz-Herrera, M. Aliabadi
Proton Nuclear Magnetic Resonance (1H NMR) is a science to study the relationship between the energy level transitions of hydrogen nuclei in organic compounds under the action of magnetic field and the chemical environment in molecules. The NMR data of organic compounds mainly include the chemical shift (resonance frequency), the number of hydrogen atoms, the peak shape (peak splitting), and the coupling constant of hydrogen functional groups, which are closely related to the structure of organic compounds. In the process of conducting structural identification of organic compounds, we deeply feel that although we have understood the basic principle of nuclearmagnetic resonance phenomenonand the basic theory of chemical shift, peak integral area, spin coupling and spin splitting, coupling constant and so on, if there is no perceptual knowledge about nuclear magnetic resonance of various hydrogen functional groups in organic compounds, it is not enough to help us to analyze the structure of organic compounds skillfully. In addition, in the short 30 years from 1990s to now, with the theory and technology of NMR and computer science becomingmore and more mature, the research on the structure of organic compounds has tended to be micro, fast, and accurate, which greatly shortens the research period of natural organic compounds. On the basis of the development and wide application of separation and purification technology of natural organic compounds represented by conventional chromatography and preparative liquid chromatography, a large number of natural organic compounds with relatively complex structures have been identified, and the NMR signals of these compounds have been fully assigned, thus accumulating a large number of spectral data of natural organic compounds. These data are very important for researchers engaged in the research of organic chemistry (including natural organic chemistry), because they not only help to simplify the structural identification of known compounds obtained in organic chemistry research, but also can be used as an important reference in the structural identification of new similar compounds and even novel compounds. Natural organic chemistry is a basic subject to study the organic composition, structure, and change law of natural biological resources. It has been playing an important role in the research of organic chemistry, pharmaceutical chemistry, biochemistry, botany, and other disciplines, as well as the development of pharmaceutical industry and pesticide industry. For example, through the application of various natural organic compounds separation and purification methods and modern organic structure identification methods, tens of thousands of plant secondary metabolites have been identified in the field of phytochemistry, which not only greatly enriched the structure and types of organic compounds, but also proved that many components have significant physiological activities, or play an important role i
{"title":"Preface","authors":"L. Rodríguez-Tembleque, J. Sanz-Herrera, M. Aliabadi","doi":"10.1142/s1756973722020012","DOIUrl":"https://doi.org/10.1142/s1756973722020012","url":null,"abstract":"Proton Nuclear Magnetic Resonance (1H NMR) is a science to study the relationship between the energy level transitions of hydrogen nuclei in organic compounds under the action of magnetic field and the chemical environment in molecules. The NMR data of organic compounds mainly include the chemical shift (resonance frequency), the number of hydrogen atoms, the peak shape (peak splitting), and the coupling constant of hydrogen functional groups, which are closely related to the structure of organic compounds. In the process of conducting structural identification of organic compounds, we deeply feel that although we have understood the basic principle of nuclearmagnetic resonance phenomenonand the basic theory of chemical shift, peak integral area, spin coupling and spin splitting, coupling constant and so on, if there is no perceptual knowledge about nuclear magnetic resonance of various hydrogen functional groups in organic compounds, it is not enough to help us to analyze the structure of organic compounds skillfully. In addition, in the short 30 years from 1990s to now, with the theory and technology of NMR and computer science becomingmore and more mature, the research on the structure of organic compounds has tended to be micro, fast, and accurate, which greatly shortens the research period of natural organic compounds. On the basis of the development and wide application of separation and purification technology of natural organic compounds represented by conventional chromatography and preparative liquid chromatography, a large number of natural organic compounds with relatively complex structures have been identified, and the NMR signals of these compounds have been fully assigned, thus accumulating a large number of spectral data of natural organic compounds. These data are very important for researchers engaged in the research of organic chemistry (including natural organic chemistry), because they not only help to simplify the structural identification of known compounds obtained in organic chemistry research, but also can be used as an important reference in the structural identification of new similar compounds and even novel compounds. Natural organic chemistry is a basic subject to study the organic composition, structure, and change law of natural biological resources. It has been playing an important role in the research of organic chemistry, pharmaceutical chemistry, biochemistry, botany, and other disciplines, as well as the development of pharmaceutical industry and pesticide industry. For example, through the application of various natural organic compounds separation and purification methods and modern organic structure identification methods, tens of thousands of plant secondary metabolites have been identified in the field of phytochemistry, which not only greatly enriched the structure and types of organic compounds, but also proved that many components have significant physiological activities, or play an important role i","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42750678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-28DOI: 10.1142/s1756973721440029
F. Parrinello, I. Benedetti
The present contribution proposes a formulation based on the use of hybrid equilibrium elements (HEEs), for the analysis of inter-element delamination and fracture propagation problems. HEEs are defined in terms of quadratic stress fields, which strongly verify both the homogeneous and inter-element equilibrium equations and they are employed with interfaces, initially exhibiting rigid behavior, embedded at the elements’ sides. The interface model is formulated in terms of the same degrees of freedom of the HEE, without any additional burden. The cohesive zone model (CZM) of the extrinsic interface is rigorously developed in the damage mechanics framework, with perfect adhesion at the pre-failure condition and with linear softening at the post-failure regime. After a brief review, the formulation is computationally tested by simulating the behavior of a double-cantilever-beam with diagonal loads; the obtained numerical results confirm the accuracy and potential of the method.
{"title":"Inter-Element Crack Propagation with High-Order Stress Equilibrium Element","authors":"F. Parrinello, I. Benedetti","doi":"10.1142/s1756973721440029","DOIUrl":"https://doi.org/10.1142/s1756973721440029","url":null,"abstract":"The present contribution proposes a formulation based on the use of hybrid equilibrium elements (HEEs), for the analysis of inter-element delamination and fracture propagation problems. HEEs are defined in terms of quadratic stress fields, which strongly verify both the homogeneous and inter-element equilibrium equations and they are employed with interfaces, initially exhibiting rigid behavior, embedded at the elements’ sides. The interface model is formulated in terms of the same degrees of freedom of the HEE, without any additional burden. The cohesive zone model (CZM) of the extrinsic interface is rigorously developed in the damage mechanics framework, with perfect adhesion at the pre-failure condition and with linear softening at the post-failure regime. After a brief review, the formulation is computationally tested by simulating the behavior of a double-cantilever-beam with diagonal loads; the obtained numerical results confirm the accuracy and potential of the method.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49482971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1142/s1756973721440030
A. Materna, H. Lauschmann, J. Ondracek
{"title":"Residual Stress Around the Fatigue Crack front in a Rectangular Sample cut from CT Specimen","authors":"A. Materna, H. Lauschmann, J. Ondracek","doi":"10.1142/s1756973721440030","DOIUrl":"https://doi.org/10.1142/s1756973721440030","url":null,"abstract":"","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49035536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-14DOI: 10.1142/s1756973721440017
M. Lo Cascio, I. Benedetti
Numerical tools which are able to predict and explain the initiation and propagation of damage at the microscopic level in heterogeneous materials are of high interest for the analysis and design of modern materials. In this contribution, we report the application of a recently developed numerical scheme based on the coupling between the Virtual Element Method (VEM) and the Boundary Element Method (BEM) within the framework of continuum damage mechanics (CDM) to analyze the progressive loss of material integrity in heterogeneous materials with complex microstructures. VEM is a novel numerical technique that, allowing the use of general polygonal mesh elements, assures conspicuous simplification in the data preparation stage of the analysis, notably for computational micro-mechanics problems, whose analysis domain often features elaborate geometries. BEM is a widely adopted and efficient numerical technique that, due to its underlying formulation, allows reducing the problem dimensionality, resulting in substantial simplification of the pre-processing stage and in the decrease of the computational effort without affecting the solution accuracy. The implemented technique has been applied to an artificial microstructure, consisting of the transverse section of a circular shaped stiff inclusion embedded in a softer matrix. BEM is used to model the inclusion that is supposed to behave within the linear elastic range, while VEM is used to model the surrounding matrix material, developing more complex nonlinear behaviors. Numerical results are reported and discussed to validate the proposed method.
{"title":"Coupling BEM and VEM for the Analysis of Composite Materials with Damage","authors":"M. Lo Cascio, I. Benedetti","doi":"10.1142/s1756973721440017","DOIUrl":"https://doi.org/10.1142/s1756973721440017","url":null,"abstract":"Numerical tools which are able to predict and explain the initiation and propagation of damage at the microscopic level in heterogeneous materials are of high interest for the analysis and design of modern materials. In this contribution, we report the application of a recently developed numerical scheme based on the coupling between the Virtual Element Method (VEM) and the Boundary Element Method (BEM) within the framework of continuum damage mechanics (CDM) to analyze the progressive loss of material integrity in heterogeneous materials with complex microstructures. VEM is a novel numerical technique that, allowing the use of general polygonal mesh elements, assures conspicuous simplification in the data preparation stage of the analysis, notably for computational micro-mechanics problems, whose analysis domain often features elaborate geometries. BEM is a widely adopted and efficient numerical technique that, due to its underlying formulation, allows reducing the problem dimensionality, resulting in substantial simplification of the pre-processing stage and in the decrease of the computational effort without affecting the solution accuracy. The implemented technique has been applied to an artificial microstructure, consisting of the transverse section of a circular shaped stiff inclusion embedded in a softer matrix. BEM is used to model the inclusion that is supposed to behave within the linear elastic range, while VEM is used to model the surrounding matrix material, developing more complex nonlinear behaviors. Numerical results are reported and discussed to validate the proposed method.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45785861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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