Pub Date : 1900-01-01DOI: 10.23967/WCCM-ECCOMAS.2020.127
C. Stoura, E. Dimitrakopoulos
. This paper studies the effect of vehicle-bridge interaction (VBI) on the vibration of the supporting bridge, and subsequently proposes a decoupled analysis scheme for the VBI problem with reference to high-speed railway systems. The study examines the VBI problem analytically and reveals the main coupling parameters between vehicles and bridges. It proves that, except for the stiffness ratio, the impedance ratio, defined as the ratio of the vehicle’s damping and bridge’s mechanical impedance, is also a dominant coupling parameter between vehicles and bridges. Following, the study shows that VBI alters the mechanical system of the bridge via an additional damping, an additional stiffness and a modified loading term. The coupling terms (i.e., the vehicle response) appear solely in the modified loading term. Assuming small stiffness ratio, which is realistic for practical train-bridge systems, the proposed decoupling scheme eliminates the vehicle response from the bridge’s equation of motion in a systematic manner. With respect to the fully coupled system, the proposed method returns more accurate results compared to well-known decoupling methodologies, such as the moving load approximation.
{"title":"Effect of Vehicle-Bridge-Interaction on the Vibration of the Bridge","authors":"C. Stoura, E. Dimitrakopoulos","doi":"10.23967/WCCM-ECCOMAS.2020.127","DOIUrl":"https://doi.org/10.23967/WCCM-ECCOMAS.2020.127","url":null,"abstract":". This paper studies the effect of vehicle-bridge interaction (VBI) on the vibration of the supporting bridge, and subsequently proposes a decoupled analysis scheme for the VBI problem with reference to high-speed railway systems. The study examines the VBI problem analytically and reveals the main coupling parameters between vehicles and bridges. It proves that, except for the stiffness ratio, the impedance ratio, defined as the ratio of the vehicle’s damping and bridge’s mechanical impedance, is also a dominant coupling parameter between vehicles and bridges. Following, the study shows that VBI alters the mechanical system of the bridge via an additional damping, an additional stiffness and a modified loading term. The coupling terms (i.e., the vehicle response) appear solely in the modified loading term. Assuming small stiffness ratio, which is realistic for practical train-bridge systems, the proposed decoupling scheme eliminates the vehicle response from the bridge’s equation of motion in a systematic manner. With respect to the fully coupled system, the proposed method returns more accurate results compared to well-known decoupling methodologies, such as the moving load approximation.","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"127 19","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120935086","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 : 1900-01-01DOI: 10.23967/WCCM-ECCOMAS.2020.245
A. Caboussat, J. Hess, A. Masserey, M. Picasso
. A mathematical model coupling the heat and fluid flow with solidification and free surfaces is presented. The numerical method relies on an operator splitting strategy, and a two-grid method. The free surfaces are tracked with a volume-of-fluid approach. A special emphasis is laid on the modeling of surface tension forces on the free surface. A comparison between approaches is highlighted, and a mesh convergence analysis is presented. Finally, the model is validated with the simulation of a static laser melting process.
{"title":"Numerical Simulation of Temperature-Driven Free Surface Flows, with Application to Laser Surface Melting","authors":"A. Caboussat, J. Hess, A. Masserey, M. Picasso","doi":"10.23967/WCCM-ECCOMAS.2020.245","DOIUrl":"https://doi.org/10.23967/WCCM-ECCOMAS.2020.245","url":null,"abstract":". A mathematical model coupling the heat and fluid flow with solidification and free surfaces is presented. The numerical method relies on an operator splitting strategy, and a two-grid method. The free surfaces are tracked with a volume-of-fluid approach. A special emphasis is laid on the modeling of surface tension forces on the free surface. A comparison between approaches is highlighted, and a mesh convergence analysis is presented. Finally, the model is validated with the simulation of a static laser melting process.","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126744732","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 : 1900-01-01DOI: 10.23967/WCCM-ECCOMAS.2020.282
A. Kolyshkin
In this paper we present a reduced order model for simulating mud motor performance and reliability. The model breaks down a mud motor power section to a set of 2D simulations with simplified drilling fluid flow description. It can reliably predict power curves and failure risks caused by elastomer fatigue, hysteresis heating, and debonding. The model can capture mud compatibility effects as well. Due to relatively short simulation time, it becomes feasible to perform simulations for new motor design, elastomer, failure analysis, or to find optimal motor type, elastomer, interference fit, and differential pressure for a specific job.
{"title":"Predicting Mud Motor Performance and Reliability with Reduced Order Modeling","authors":"A. Kolyshkin","doi":"10.23967/WCCM-ECCOMAS.2020.282","DOIUrl":"https://doi.org/10.23967/WCCM-ECCOMAS.2020.282","url":null,"abstract":"In this paper we present a reduced order model for simulating mud motor performance and reliability. The model breaks down a mud motor power section to a set of 2D simulations with simplified drilling fluid flow description. It can reliably predict power curves and failure risks caused by elastomer fatigue, hysteresis heating, and debonding. The model can capture mud compatibility effects as well. Due to relatively short simulation time, it becomes feasible to perform simulations for new motor design, elastomer, failure analysis, or to find optimal motor type, elastomer, interference fit, and differential pressure for a specific job.","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134397328","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 : 1900-01-01DOI: 10.23967/WCCM-ECCOMAS.2020.158
P. Karakitsios, G. Karaiskos, A. Leontaris, P. Kolios
{"title":"Geomiso TNL: A Software for Non-Linear Static T-Spline-Based Isogeometric Analysis of Complex Multi-Patch Structures","authors":"P. Karakitsios, G. Karaiskos, A. Leontaris, P. Kolios","doi":"10.23967/WCCM-ECCOMAS.2020.158","DOIUrl":"https://doi.org/10.23967/WCCM-ECCOMAS.2020.158","url":null,"abstract":"","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131390550","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 : 1900-01-01DOI: 10.23967/WCCM-ECCOMAS.2020.027
A. Zmitrowicz
Abstract. Friction models of polymers must be considered in terms of specific microstructures, specific friction mechanisms and different scales on external surfaces of polymeric solids and inside the polymeric materials. Presented friction models take into account: evolution of surface microstructures, friction anisotropy and heterogeneity on surfaces of polymeric solids, micromechanical models of macromolecules, friction anisotropy in bulk polymeric materials
{"title":"A Multiscale Approach to Friction On Surfaces of Polymeric Solids and in Bulk Polymeric Materials","authors":"A. Zmitrowicz","doi":"10.23967/WCCM-ECCOMAS.2020.027","DOIUrl":"https://doi.org/10.23967/WCCM-ECCOMAS.2020.027","url":null,"abstract":"Abstract. Friction models of polymers must be considered in terms of specific microstructures, specific friction mechanisms and different scales on external surfaces of polymeric solids and inside the polymeric materials. Presented friction models take into account: evolution of surface microstructures, friction anisotropy and heterogeneity on surfaces of polymeric solids, micromechanical models of macromolecules, friction anisotropy in bulk polymeric materials","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126778514","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 : 1900-01-01DOI: 10.23967/WCCM-ECCOMAS.2020.217
A. Ouazzi, N. Begum, S. Turek
{"title":"Newton-Multigrid FEM Solver for the Simulation of Quasi-Newtonian Modeling of Thixotropic Flows","authors":"A. Ouazzi, N. Begum, S. Turek","doi":"10.23967/WCCM-ECCOMAS.2020.217","DOIUrl":"https://doi.org/10.23967/WCCM-ECCOMAS.2020.217","url":null,"abstract":"","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129270815","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 : 1900-01-01DOI: 10.23967/WCCM-ECCOMAS.2020.313
J. Muralha, C. Silva, L. Eça, C. Klaij
. Although considering the fluid to be incompressible is a common and valid approximation in most hydrodynamic simulations, certain phenomena like sloshing or slamming involve compressibility effects. In order to capture such effects, the maritime CFD code ReFRESCO is being extended with a compressible flow solver for the air in two-phase flow simulations. The compressible Navier-Stokes equations, discretized with a cell-centered, collocated finite volume method, are solved with a pressure-based SIMPLE algorithm that is compatible with the incompressible flow solver and enforces pressure-velocity-density coupling with a pressure-correction equation and an equation of state. In this paper, the compressible solver is tested for subsonic, transonic and supersonic flow of an inviscid perfect gas in a channel with an arc circular bump. We confirm that the pressure-based solver can indeed achieve iterative convergence to levels close to machine accuracy for all three regimes, with moderate decrease of convergence rate at higher Mach numbers and on finer grids. Grid refinement studies are performed to determine its accuracy and show observed orders of grid convergence between one and two for different quantities and different convection schemes, with lowest order for the supersonic regime, as expected. Finally, we notice that monotonic grid convergence can be
{"title":"Solution Verification Studies of a Pressure-Based Compressible Flow Solver","authors":"J. Muralha, C. Silva, L. Eça, C. Klaij","doi":"10.23967/WCCM-ECCOMAS.2020.313","DOIUrl":"https://doi.org/10.23967/WCCM-ECCOMAS.2020.313","url":null,"abstract":". Although considering the fluid to be incompressible is a common and valid approximation in most hydrodynamic simulations, certain phenomena like sloshing or slamming involve compressibility effects. In order to capture such effects, the maritime CFD code ReFRESCO is being extended with a compressible flow solver for the air in two-phase flow simulations. The compressible Navier-Stokes equations, discretized with a cell-centered, collocated finite volume method, are solved with a pressure-based SIMPLE algorithm that is compatible with the incompressible flow solver and enforces pressure-velocity-density coupling with a pressure-correction equation and an equation of state. In this paper, the compressible solver is tested for subsonic, transonic and supersonic flow of an inviscid perfect gas in a channel with an arc circular bump. We confirm that the pressure-based solver can indeed achieve iterative convergence to levels close to machine accuracy for all three regimes, with moderate decrease of convergence rate at higher Mach numbers and on finer grids. Grid refinement studies are performed to determine its accuracy and show observed orders of grid convergence between one and two for different quantities and different convection schemes, with lowest order for the supersonic regime, as expected. Finally, we notice that monotonic grid convergence can be","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131208842","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 : 1900-01-01DOI: 10.23967/WCCM-ECCOMAS.2020.177
J. Brenneisen, S. Schuler, E. Kovacheva, T. Gerach, O. Dössel, A. Loewe
. Individualized computer models of the geometry of the human heart are often based on mag-netic resonance images (MRI) or computed tomography (CT) scans. The stress distribution in the imaged state cannot be measured but needs to be estimated from the segmented geometry, e.g. by an iterative algorithm. As the convergence of this algorithm depends on different geometrical conditions, we systematically studied their influence. Beside various shape alterations, we investigated the chamber volume, as well as the effect of material parameters. We found a marked influence of passive material parameters: increasing the model stiffness by a factor of ten halved the residual norm in the first iteration. Flat and concave areas led to a reduced robustness and convergence rate of the unloading algorithm. With this study, the geometric effects and modeling aspects governing the unloading algorithm’s convergence are identified and can be used as a basis for further improvement.
{"title":"Influence of Geometrical Properties for the Calculation of a Pressure-Free Whole Heart Geometry","authors":"J. Brenneisen, S. Schuler, E. Kovacheva, T. Gerach, O. Dössel, A. Loewe","doi":"10.23967/WCCM-ECCOMAS.2020.177","DOIUrl":"https://doi.org/10.23967/WCCM-ECCOMAS.2020.177","url":null,"abstract":". Individualized computer models of the geometry of the human heart are often based on mag-netic resonance images (MRI) or computed tomography (CT) scans. The stress distribution in the imaged state cannot be measured but needs to be estimated from the segmented geometry, e.g. by an iterative algorithm. As the convergence of this algorithm depends on different geometrical conditions, we systematically studied their influence. Beside various shape alterations, we investigated the chamber volume, as well as the effect of material parameters. We found a marked influence of passive material parameters: increasing the model stiffness by a factor of ten halved the residual norm in the first iteration. Flat and concave areas led to a reduced robustness and convergence rate of the unloading algorithm. With this study, the geometric effects and modeling aspects governing the unloading algorithm’s convergence are identified and can be used as a basis for further improvement.","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116616882","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 : 1900-01-01DOI: 10.23967/WCCM-ECCOMAS.2020.088
N. Delaissé, Toon Demeester, D. Fauconnier, J. Degroote
. Fluid-structure interaction (FSI) problems are frequently solved using partitioned simulation techniques with black-box solvers, reusing reliable and optimized codes. These problems can principally be reduced to solving a root-finding problem. In case of strong coupling, pure Gauss-Seidel iterations between the structure and flow solvers are unstable for lower modes. In these cases, quasi-Newton techniques are used, which construct an approximation of the Jacobian or its inverse by reusing information from previous iterations and time steps. Four different quasi-Newton techniques are compared: the interface quasi-Newton algorithm with an approximation for the inverse of the Jacobian from a least-squares model (IQN-ILS), the interface block quasi-Newton algorithm with approximate Jacobians from least-squares models (IBQN-LS), the interface quasi-Newton technique with multiple vector Jacobian (IQN-MVJ) and the multi-vector update quasi-Newton technique (MVQN). These coupling algorithms are differentiated based on whether the approximation of the Jacobian is performed for the entire black-box system (IQN-ILS and IQN-MVJ) or for both individual solvers (IBQN-LS and MVQN). Moreover, a distinction is made between methods which perform the approximation with either least-squares models (IQN-ILS and IBQN-LS) or multi-vector techniques (IQN-MVJ and MVQN). Their performance is compared by solving a 1D flexible tube case, using the in-house coupling software CoCoNuT. Both the memory usage and number of iterations between structure and flow solvers in each time step are examined. The techniques using a multi-vector approach require explicit matrix construction, so that memory requirements scale quadratically, whereas the least-squares techniques have a matrix-free implementation, resulting in linear scaling. In terms of convergence they are comparable.
{"title":"Comparison of Different Quasi-Newton Techniques for Coupling of Black Box Solvers","authors":"N. Delaissé, Toon Demeester, D. Fauconnier, J. Degroote","doi":"10.23967/WCCM-ECCOMAS.2020.088","DOIUrl":"https://doi.org/10.23967/WCCM-ECCOMAS.2020.088","url":null,"abstract":". Fluid-structure interaction (FSI) problems are frequently solved using partitioned simulation techniques with black-box solvers, reusing reliable and optimized codes. These problems can principally be reduced to solving a root-finding problem. In case of strong coupling, pure Gauss-Seidel iterations between the structure and flow solvers are unstable for lower modes. In these cases, quasi-Newton techniques are used, which construct an approximation of the Jacobian or its inverse by reusing information from previous iterations and time steps. Four different quasi-Newton techniques are compared: the interface quasi-Newton algorithm with an approximation for the inverse of the Jacobian from a least-squares model (IQN-ILS), the interface block quasi-Newton algorithm with approximate Jacobians from least-squares models (IBQN-LS), the interface quasi-Newton technique with multiple vector Jacobian (IQN-MVJ) and the multi-vector update quasi-Newton technique (MVQN). These coupling algorithms are differentiated based on whether the approximation of the Jacobian is performed for the entire black-box system (IQN-ILS and IQN-MVJ) or for both individual solvers (IBQN-LS and MVQN). Moreover, a distinction is made between methods which perform the approximation with either least-squares models (IQN-ILS and IBQN-LS) or multi-vector techniques (IQN-MVJ and MVQN). Their performance is compared by solving a 1D flexible tube case, using the in-house coupling software CoCoNuT. Both the memory usage and number of iterations between structure and flow solvers in each time step are examined. The techniques using a multi-vector approach require explicit matrix construction, so that memory requirements scale quadratically, whereas the least-squares techniques have a matrix-free implementation, resulting in linear scaling. In terms of convergence they are comparable.","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"64 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116271065","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 : 1900-01-01DOI: 10.23967/wccm-eccomas.2020.339
I. Meshi, U. Breiman, R. Haj-Ali
. A multiscale model based on finite element (FE) and the Parametric High-Fidelity-Generalized-Method-of-Cells (PHFGMC) micromechanical model was formulated and implemented to solve the compression problem in unidirectional IM7/977-3 carbon epoxy composite. The nonlinear PHFGMC governing equations were obtained from a two-layered (local-global) virtual work principle and solved using a incremental-iterative formulation. In addition, the semi-analytical modified Lo and Chim failure criterion (based on the buckling of Timoshenko’s beam) for unidirectional fiber-reinforced composite materials under compression [1] was adopted and combined with the FE-PHFGMC multiscale model. In this study, the criterion was employed for the general case of a multi-axial loading state accompanied with a nonlinear polymeric matrix behavior, where the local and thus effective properties of the composite change continuously throughout the loading path. Therefore the predicted lamina strength was incrementally reevaluated. In the present model, the use of the nonlinear constitutive model Ramberg-Osgood was used for the matrix media and a linear-elastic transversely-isotropic law for the fiber, as common for carbon fibrous composites. This extends the existing criterion to account for the material microstructure with a refined parametric discretization, as well as the effect of a nonlinear constitutive law. The advantage of the proposed model is to predict the compressive damage (kink band formation and its width) and the compressive strength (within 11% of experimental data)
． 为解决单向IM7/977-3碳环氧复合材料的压缩问题，建立并实现了基于有限元(FE)和参数化高保真广义单元法(PHFGMC)的多尺度模型。利用两层(局部-全局)虚功原理得到非线性PHFGMC控制方程，并采用增量迭代法求解。采用基于Timoshenko梁屈曲的单向纤维增强复合材料半解析修正Lo and Chim破坏准则[1]，并与FE-PHFGMC多尺度模型相结合。在本研究中，该准则适用于伴随非线性聚合物基体行为的多轴加载状态的一般情况，其中复合材料的局部和有效性能在整个加载路径中连续变化。因此，对预测的层板强度进行增量重新评估。在本模型中，基体介质采用非线性本构模型Ramberg-Osgood，纤维采用线弹性横向各向同性定律，与碳纤维复合材料一样。这扩展了现有的标准，以考虑材料微观结构与细化参数离散化，以及非线性本构律的影响。该模型的优点是可以预测材料的抗压损伤(扭结带的形成及其宽度)和抗压强度(在实验数据的11%以内)。
{"title":"The Parametric High-Fidelity-Generalized-Method-of-Cells (PHFGMC) Micromechanical Model for Compression Failure of FRP Composites","authors":"I. Meshi, U. Breiman, R. Haj-Ali","doi":"10.23967/wccm-eccomas.2020.339","DOIUrl":"https://doi.org/10.23967/wccm-eccomas.2020.339","url":null,"abstract":". A multiscale model based on finite element (FE) and the Parametric High-Fidelity-Generalized-Method-of-Cells (PHFGMC) micromechanical model was formulated and implemented to solve the compression problem in unidirectional IM7/977-3 carbon epoxy composite. The nonlinear PHFGMC governing equations were obtained from a two-layered (local-global) virtual work principle and solved using a incremental-iterative formulation. In addition, the semi-analytical modified Lo and Chim failure criterion (based on the buckling of Timoshenko’s beam) for unidirectional fiber-reinforced composite materials under compression [1] was adopted and combined with the FE-PHFGMC multiscale model. In this study, the criterion was employed for the general case of a multi-axial loading state accompanied with a nonlinear polymeric matrix behavior, where the local and thus effective properties of the composite change continuously throughout the loading path. Therefore the predicted lamina strength was incrementally reevaluated. In the present model, the use of the nonlinear constitutive model Ramberg-Osgood was used for the matrix media and a linear-elastic transversely-isotropic law for the fiber, as common for carbon fibrous composites. This extends the existing criterion to account for the material microstructure with a refined parametric discretization, as well as the effect of a nonlinear constitutive law. The advantage of the proposed model is to predict the compressive damage (kink band formation and its width) and the compressive strength (within 11% of experimental data)","PeriodicalId":148883,"journal":{"name":"14th WCCM-ECCOMAS Congress","volume":"21 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120999347","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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