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Recent Trends in Constitutive Modeling of Advanced Materials最新文献

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Material Modelling of Sheet Metal by Bi-Axial Loading Tests 通过双轴加载试验的金属薄板材料建模
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1197
H. H. Pijlman, J. Brinkman, H. Huetink, H. Vegter
{"title":"Material Modelling of Sheet Metal by Bi-Axial Loading Tests","authors":"H. H. Pijlman, J. Brinkman, H. Huetink, H. Vegter","doi":"10.1115/imece2000-1197","DOIUrl":"https://doi.org/10.1115/imece2000-1197","url":null,"abstract":"\u0000 A new material description for sheet metal forming has been developed. The material description exists of the Vegter yield criterion and a physically based hardening rule. In contrast to most former criteria, the Vegter yield criterion is based on measurements of multi-axial yield stress states. The yield criterion is extended with a physically based hardening rule, in which the flow stress depends on the strain and strain rate.\u0000 To measure the multi-axial stress states a biaxial test equipment is being designed. The test equipment will be capable of imposing a shear deformation and a plane strain deformation, including combinations of both deformations. To check whether the bi-axial test equipment will give reliable results, a Finite Element model of a part of the test piece and the clamp equipment is constructed.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132672315","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}
引用次数: 2
Development of a New Technique for Measuring Volume Change of Dry Particulate Systems Under Very Low Confining Pressures 极低围压下干燥颗粒系统体积变化测量新技术的发展
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1195
A. Abdel-hadi, N. Cristescu, O. Cazacu, R. Bucklin
{"title":"Development of a New Technique for Measuring Volume Change of Dry Particulate Systems Under Very Low Confining Pressures","authors":"A. Abdel-hadi, N. Cristescu, O. Cazacu, R. Bucklin","doi":"10.1115/imece2000-1195","DOIUrl":"https://doi.org/10.1115/imece2000-1195","url":null,"abstract":"\u0000 A new technique has been developed to measure volume change at very low confining pressures. Such low confining stress levels may be experienced in typical powder technology applications (storage and transport of particulate systems). The aim of this technique is to obtain more accurate information on the deformation, failure and flow behavior of cohesive powders under a variety of loading conditions and deformation rates. The technique allows covering the entire pressure regime that is covered by commercially available and industrially applied powder flow testers. It bridges the gap of multiple devices, whose ranges of test conditions do not overlap, thus facilitating cross-calibration of equipment and increases confidence (and reliability) of all compaction data obtained. The investigation of the effect of initial porosity on powder flowability was chosen to test the new experimental setup.\u0000 In particular, triaxial tests have been carried out on samples of different particulate systems and the results have been presented at different confining pressures and on samples of different initial porosities.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132370517","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}
引用次数: 1
Some Equivalences in the Theory of Linear Viscoelasticity and Their Implications in Modeling and Simulation 线性粘弹性理论中的一些等价及其在建模和仿真中的意义
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1191
K. Papoulia, V. Panoskaltsis, Igor Korovajchuk
{"title":"Some Equivalences in the Theory of Linear Viscoelasticity and Their Implications in Modeling and Simulation","authors":"K. Papoulia, V. Panoskaltsis, Igor Korovajchuk","doi":"10.1115/imece2000-1191","DOIUrl":"https://doi.org/10.1115/imece2000-1191","url":null,"abstract":"\u0000 A class of linear viscoelastic models is examined which accurately represent the response of many materials in a wide frequency range. These include power law and logarithmic type models, such as those of fractional order, the Kuhn model of linear viscoelasticity and generalizations thereof. An equivalence between the fractional element and the generalized Kuhn model is established. A continuous representation of these models is naturally available. It is shown that a discrete rheological representation, in the form of series of springs and dashpots, is also possible. This allows an internal variable formulation, which establishes the thermodynamic admissibility of this class of models, in the sense that they satisfy the dissipation inequality. Introduction of appropriate state variables leads to convolution type equations, which, in the finite deformation case, retain much of the structure of linear viscoelasticity. Numerical implementation of the models is enhanced by the equivalence principles. It is shown that the accuracy expected of a long chain of classical structural units is achieved with a greatly reduced number of model parameters.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132039120","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}
引用次数: 0
Assessment of Damage in Heterogeneous Concrete Composites 非均质混凝土复合材料损伤评估
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1200
Pawel Smolarkiewicz, K. Willam
{"title":"Assessment of Damage in Heterogeneous Concrete Composites","authors":"Pawel Smolarkiewicz, K. Willam","doi":"10.1115/imece2000-1200","DOIUrl":"https://doi.org/10.1115/imece2000-1200","url":null,"abstract":"\u0000 Ultrasonic testing provides non-destructive measurements, which are widely used to evaluate stiffness degradation in materials and structures. In a recent study, a computational simulation method was developed for modeling ultrasonic pulse propagation in heterogeneous concrete materials. This method is based on a two-phase finite element model of the particle composite consisting of linearly elastic aggregate inclusions and a cement matrix, the damage of which is assessed via dynamic wave transmission analogous to ultrasonic testing. The advantage of this approach is its ability to examine the heterogeneous meso-structure and the progressive degradation of the elastic stiffness properties of the cement matrix. Although it proved very informative to simulate the ultrasonic response in coarse concrete mixes, it is unfortunately computationally very demanding because of the high mesh resolution necessary in space and time. The question arises, whether a simpler, less expensive method based on homogenized effective stiffness properties can provide comparable results. It is the objective of this paper to show, that, in fact, the resolution of the heterogeneities is necessary, and that the use of homogenized concrete properties cannot provide the information when progressive degradation is considered in the cement matrix which magnifies the contrast of the heterogeneous meso-structure.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132628847","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}
引用次数: 0
Constitutive Modeling of Multiaxial Deformation and Induced Anisotropy in Superplastic Materials 超塑性材料多轴变形及诱导各向异性的本构建模
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1196
M. Khraisheh
{"title":"Constitutive Modeling of Multiaxial Deformation and Induced Anisotropy in Superplastic Materials","authors":"M. Khraisheh","doi":"10.1115/imece2000-1196","DOIUrl":"https://doi.org/10.1115/imece2000-1196","url":null,"abstract":"\u0000 The multiaxial deformation of superplastic materials is modeled within a continuum theory of viscoplasticity using a generalized anisotropic dynamic yield function. The anisotropic dynamic yield function is capable of describing the evolution of the initial anisotropic state of the yield potential through the evolution of unit vectors defining the direction of anisotropy. The evolution of the direction of anisotropy is represented by a constitutive spin such that initially it is identical to the Eulerian spin and as deformation continues, it tends towards an orthotropic spin. Experiments on the model Pb-Sn alloy were conducted and used to calibrate and verify the constructed model. It is shown that the model in conjunction with the anisotropic dynamic yield function is capable of predicting the actual trend of the induced axial stresses recorded in fixed-end torsion experiments.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124170922","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}
引用次数: 1
Multiscale Analysis of Trabecular Bone 骨小梁的多尺度分析
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1194
Frederic Bouyge, I. Jasiuk
{"title":"Multiscale Analysis of Trabecular Bone","authors":"Frederic Bouyge, I. Jasiuk","doi":"10.1115/imece2000-1194","DOIUrl":"https://doi.org/10.1115/imece2000-1194","url":null,"abstract":"\u0000 Bone has a complex hierarchical structure. We study trabecular bone as a multi-scale material. In particular, we distinguish the following scales: nanostructural (collagen fibrils and apatite crystals), microscale (single laminae and laminated structure), mesoscale (random network of struts), and macroscale. We first present experimental observations and an overview of existing theoretical models of bone. Then, we construct a hierarchical model to predict elastic properties of trabecular bone.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"10 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120864935","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}
引用次数: 0
Multiaxial Behavior and Viscoelastic Constitutive Modeling of Epoxy Polymers 环氧聚合物的多轴行为及粘弹性本构模型
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1192
Yafei Hu
{"title":"Multiaxial Behavior and Viscoelastic Constitutive Modeling of Epoxy Polymers","authors":"Yafei Hu","doi":"10.1115/imece2000-1192","DOIUrl":"https://doi.org/10.1115/imece2000-1192","url":null,"abstract":"\u0000 A nonlinear viscoelastic constitutive model previously proposed has been modified to account for hydrostatic stress influence. The modification is achieved by incorporating the hydrostatic stress in the equivalent stress definition. The present model predicts a shift of stress envelopes along equibiaxial compressive stress direction. It also predicts different octahedral shear stress versus octahedral shear strain curves for various strain paths. These trends indicate improved agreement between the model prediction and multiaxial experiment data.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"9 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120893450","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}
引用次数: 5
On a Constitutive Model for Twisted Hybrid Yarns 混合捻纱本构模型的研究
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1193
T. Godfrey, J. Rossettos
{"title":"On a Constitutive Model for Twisted Hybrid Yarns","authors":"T. Godfrey, J. Rossettos","doi":"10.1115/imece2000-1193","DOIUrl":"https://doi.org/10.1115/imece2000-1193","url":null,"abstract":"\u0000 A simple micromechanical model is developed for the interactions in a parallel square-stacked mixed array of elastic fibers representing the microstructure of a hybrid yarn undergoing axial extension. The mixed array consists of a small fraction of relatively high-modulus, low-elongation-to-break (LE) fibers dispersed among high-elongation-to-break (HE) fibers. The LE fibers are assumed to break into fragments, and the LE fiber fragments are assumed to slip relative to neighboring fibers in regions near the fragment tips. The fiber array experiences lateral compression arising from the remote tension on the twisted yarn, and frictional forces acting at slipping fiber-to-fiber contact surfaces are assumed to obey Amontons’ Law. Solutions of a dimensionless boundary value problem for deformations in a unit cell of the fiber array are presented. Dimensionless parameters involving the constituent LE and HE fiber properties are identified and their influence on hybrid yarn tensile behavior is illustrated.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133757065","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}
引用次数: 1
Cellular Automaton Approach on Micro Solidification Process of Two Phase Alloy in Horizontal Casting 水平铸造两相合金微凝固过程的元胞自动机研究
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1199
T. Tsuta, T. Iwamoto
{"title":"Cellular Automaton Approach on Micro Solidification Process of Two Phase Alloy in Horizontal Casting","authors":"T. Tsuta, T. Iwamoto","doi":"10.1115/imece2000-1199","DOIUrl":"https://doi.org/10.1115/imece2000-1199","url":null,"abstract":"\u0000 A mathematical model of micro morphology generation in solidification process has been developed using cellular automaton approach, and heterogeneous nucleations from the wall and the grain growth kinetics are simulated by using the Monte-Carlo simulation. In the next place, the change in the micro morphology from the dendritic to the equiaxial, has been analyzed in the same way, under the condition that the liquid metal in the vessel is excited from magnetic stirrer. The results are compared with those obtained by the experiments on horizontal, continuous casting and the applicability of the method has been verified.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131493825","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}
引用次数: 0
A Constitutive Model for Cyclic Loading and Relaxation 循环加载和松弛的本构模型
Recent Trends in Constitutive Modeling of Advanced Materials Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1198
H. Garmestani
{"title":"A Constitutive Model for Cyclic Loading and Relaxation","authors":"H. Garmestani","doi":"10.1115/imece2000-1198","DOIUrl":"https://doi.org/10.1115/imece2000-1198","url":null,"abstract":"\u0000 A new model is proposed which incorporates inelastic flow during cyclic loading and relaxation processes. The model is an extension of Hart’s constitutive model for inelastic flow and is based on the non-steady state condition for the frictional glide process. A new state variable is introduced here as a microhardness parameter which represents the strength or the average lifetime of the mobile dislocations relative to the frictional glide viscous drag process. The evolution of the microhardness parameter is very similar to that proposed for the hardness parameter except that the recovery plays a major role. The results show that the model can predict the transient behavior for both cyclic loading and the reloading phenomena during inelastic deformation and load relaxation.","PeriodicalId":245159,"journal":{"name":"Recent Trends in Constitutive Modeling of Advanced Materials","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128150918","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}
引用次数: 0
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