Pub Date : 1900-01-01DOI: 10.23967/composites.2021.119
M. Nicol, F. Laurin, M. Hirsekorn, J. Maire, W. Albouy, S. Treutenaere
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{"title":"Modelling the Influence of The Stacking Order on Damage in Laminated Composites","authors":"M. Nicol, F. Laurin, M. Hirsekorn, J. Maire, W. Albouy, S. Treutenaere","doi":"10.23967/composites.2021.119","DOIUrl":"https://doi.org/10.23967/composites.2021.119","url":null,"abstract":".","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"36 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":"127761079","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/composites.2021.112
G. Fourrier, C. Fagiano, M. Hirsekorn, F. Leroy, A. Rassineux, E. Baranger
{"title":"Mesoscale Modelling of Woven Composite Materials with Manufacturing Defect Using Micro-Tomography Images","authors":"G. Fourrier, C. Fagiano, M. Hirsekorn, F. Leroy, A. Rassineux, E. Baranger","doi":"10.23967/composites.2021.112","DOIUrl":"https://doi.org/10.23967/composites.2021.112","url":null,"abstract":"","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"13 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":"133835975","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/composites.2021.085
T. Lang, M. Hasan, T. Gereke, A. Abdkader, C. Cherif
Due to the current trend towards lightweight design across diverse disciplines, the usage of composites such as carbon fiber reinforced polymers has increased enormously in the last decade. With the rising usage of carbon fibers, topics like repurposing of fibers are gaining more importance. One current approach is the production of hybrid yarns from recycled staple carbon fibers and thermoplastic fibers. During each processing step from fiber to hybrid yarn, the fibers are partially damaged [1]. The resulting broad fiber length distribution considerably affects the mechanical properties of the composite. Therefore, the influence of the different fiber lengths on the fiber structures and composite properties should be investigated thoroughly.
{"title":"Modeling and Simulation of Recycled Carbon Fiber Reinforced Composites with Varying Fiber Lengths","authors":"T. Lang, M. Hasan, T. Gereke, A. Abdkader, C. Cherif","doi":"10.23967/composites.2021.085","DOIUrl":"https://doi.org/10.23967/composites.2021.085","url":null,"abstract":"Due to the current trend towards lightweight design across diverse disciplines, the usage of composites such as carbon fiber reinforced polymers has increased enormously in the last decade. With the rising usage of carbon fibers, topics like repurposing of fibers are gaining more importance. One current approach is the production of hybrid yarns from recycled staple carbon fibers and thermoplastic fibers. During each processing step from fiber to hybrid yarn, the fibers are partially damaged [1]. The resulting broad fiber length distribution considerably affects the mechanical properties of the composite. Therefore, the influence of the different fiber lengths on the fiber structures and composite properties should be investigated thoroughly.","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"2 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":"133009168","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/composites.2021.065
M. Fagerström, G.Catalanotti, N. Traiforos, Thomas Turner, Patrik Runeberg, Daoud Fernass, Dimitrios Chronopoulos, F. Glock, Gerd Schuhmacher
A significant problem encountered during the manufacturing process of thermoset composite structures is the distortion of their shape from their CAD-nominal geometry. Shape distortions can be attributed to the residual stresses which are imposed within the structure during its manufacture
{"title":"An Updated Simulation Framework for the Prediction of Process Induced Shape Distortion in Thermoset Composites","authors":"M. Fagerström, G.Catalanotti, N. Traiforos, Thomas Turner, Patrik Runeberg, Daoud Fernass, Dimitrios Chronopoulos, F. Glock, Gerd Schuhmacher","doi":"10.23967/composites.2021.065","DOIUrl":"https://doi.org/10.23967/composites.2021.065","url":null,"abstract":"A significant problem encountered during the manufacturing process of thermoset composite structures is the distortion of their shape from their CAD-nominal geometry. Shape distortions can be attributed to the residual stresses which are imposed within the structure during its manufacture","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"132 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":"133181680","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/composites.2021.106
I. Cózar, P. Maimí, F. Otero, E. González, P. Camanho, S. Miot, A. Turón
The increasing use of advanced composite materials in complex structures requires extensive experimental test campaigns to understand their mechanical response. To reduce the size of the test campaigns, efficient and reliable numerical tools are required. A new constitutive model have been developed to allow for more accurate and robust description of the mechanical behaviour of composite materials. The constitutive model allows to predict the inelastic deformation and fracture of a transversely isotropic unidirectional composite material at the meso-scale level within the framework of the infinitesimal strain theory. In the directions governed by the polymer, the model initially accounts for an elastic behaviour until the onset of plasticity is reached. Then, plasticity is taken into account until the onset of damage. In the fibre direction, the model describes the elastic response until the onset of damage and no plasticity is considered. When a crack nucleates, it propagates without plasticity in any direction (i.e. polymer and fibre directions). In this study, a yield function combined with non-associated flow rule is proposed. It allows for the volumetric plastic strains to be imposed. The shape of the yielding and damage surfaces can be modified as a function of two and six parameters, respectively. The damage model is based on the
{"title":"A Novel Plasticity-Damage Constitutive Model for Unidirectional Long Fibre Reinforced Polymer","authors":"I. Cózar, P. Maimí, F. Otero, E. González, P. Camanho, S. Miot, A. Turón","doi":"10.23967/composites.2021.106","DOIUrl":"https://doi.org/10.23967/composites.2021.106","url":null,"abstract":"The increasing use of advanced composite materials in complex structures requires extensive experimental test campaigns to understand their mechanical response. To reduce the size of the test campaigns, efficient and reliable numerical tools are required. A new constitutive model have been developed to allow for more accurate and robust description of the mechanical behaviour of composite materials. The constitutive model allows to predict the inelastic deformation and fracture of a transversely isotropic unidirectional composite material at the meso-scale level within the framework of the infinitesimal strain theory. In the directions governed by the polymer, the model initially accounts for an elastic behaviour until the onset of plasticity is reached. Then, plasticity is taken into account until the onset of damage. In the fibre direction, the model describes the elastic response until the onset of damage and no plasticity is considered. When a crack nucleates, it propagates without plasticity in any direction (i.e. polymer and fibre directions). In this study, a yield function combined with non-associated flow rule is proposed. It allows for the volumetric plastic strains to be imposed. The shape of the yielding and damage surfaces can be modified as a function of two and six parameters, respectively. The damage model is based on the","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"118 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":"123244991","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/composites.2021.054
C. Bauer, S. Pfaller
{"title":"Discrete-to-Continuum Coupling of Pre-Deformed Thermoplastic Polymers","authors":"C. Bauer, S. Pfaller","doi":"10.23967/composites.2021.054","DOIUrl":"https://doi.org/10.23967/composites.2021.054","url":null,"abstract":"","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"35 3 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":"128805791","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/composites.2021.078
M. Todt, R. Tomáš, T. Koch, H. Pettermann
{"title":"Numerical Study of yhe Creep Buckling Response of Laminated Orthotropic Linear Viscoelastic Cylindrical Shells","authors":"M. Todt, R. Tomáš, T. Koch, H. Pettermann","doi":"10.23967/composites.2021.078","DOIUrl":"https://doi.org/10.23967/composites.2021.078","url":null,"abstract":"","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"83 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":"126274779","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/composites.2021.005
V. Tojaga, A. Prapavesis, J. Faleskog, T. Gasser, A. Vuure, S. Östlund
We develop a thermodynamically consistent continuum damage micromechanics model for the compressive failure of flax fiber composites. We used a micromechanics-based constitutive model reported recently [1]. It describes the microstructure of a unidirectional composite and captures the material behavior of the fiber and matrix constituents, respectively. The description has been formulated in the reference configuration (i.e. the undeformed state of the composite) and is therefore independent of fiber rotations that may appear during the deformation of the composite. A hyperelastic finite deformation plasticity with power law hardening [3] mimics the compressive elastic-plastic stress-strain response of the fiber (reported in [2]) and the matrix. The model has been extended to account for fiber damage, resulting in a thermodynamically consistent continuum damage micromechanics model. Our results indicate that fiber damage plays an utmost role in the compressive failure of flax fiber composites – it is a major determinant of the material’s compressive stress-strain response. X-ray Computed Tomography and Scanning Electron Microscopy show that fiber damage can be attributed to intra-fiber splitting and elementary fiber crushing.
{"title":"Continuum Damage Micromechanics Model for the Compressive Failure of Flax Fiber Composites and Experimental Validation","authors":"V. Tojaga, A. Prapavesis, J. Faleskog, T. Gasser, A. Vuure, S. Östlund","doi":"10.23967/composites.2021.005","DOIUrl":"https://doi.org/10.23967/composites.2021.005","url":null,"abstract":"We develop a thermodynamically consistent continuum damage micromechanics model for the compressive failure of flax fiber composites. We used a micromechanics-based constitutive model reported recently [1]. It describes the microstructure of a unidirectional composite and captures the material behavior of the fiber and matrix constituents, respectively. The description has been formulated in the reference configuration (i.e. the undeformed state of the composite) and is therefore independent of fiber rotations that may appear during the deformation of the composite. A hyperelastic finite deformation plasticity with power law hardening [3] mimics the compressive elastic-plastic stress-strain response of the fiber (reported in [2]) and the matrix. The model has been extended to account for fiber damage, resulting in a thermodynamically consistent continuum damage micromechanics model. Our results indicate that fiber damage plays an utmost role in the compressive failure of flax fiber composites – it is a major determinant of the material’s compressive stress-strain response. X-ray Computed Tomography and Scanning Electron Microscopy show that fiber damage can be attributed to intra-fiber splitting and elementary fiber crushing.","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"25 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":"116739165","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/composites.2021.089
S. García Rodriguez, A. Chiappini, C. Huchette, S. Miot, C. Fagiano, L. Barrière
While Automated Fibre Placement (AFP) enables the manufacturing of large and geometrically complex composite structures in relatively short cycle times, the robots induce singularities that may impair the structural integrity of the component [1-2]. The aim of this study is to characterize and predict the tensile response of composite coupons including “gaps” and “overlaps”. Several AFP carbon/epoxy laminates were manufactured and subsequently cured in the autoclave. To gain insight into the microstructure and wrinkling patterns associated to each AFP-configuration, non-tested coupons were inspected using an EasyTom 230 X-ray computed tomography (CT) system located at IRT Saint-Exupéry (e.g. Figure 1a). To characterize their mechanical response, a tensile experimental campaign was carried out at ONERA (plain and open-hole coupons assisted by digital image correlation and acoustic emission) combined with ex-situ X-ray tomography inspections at incremental stress levels. In parallel to the experimental campaign, a numerical methodology was developed to predict the ultimate strength of AFP-coupons. The finite-elements models relied on a realistic description of the coupon’s geometry based on the CT results (e.g. Figure 1b), and were performed using Abaqus/Standard coupled with Onera’s Progressive Failure Model (OPFM) [3].
虽然自动纤维放置(AFP)能够在相对较短的周期时间内制造大型和几何复杂的复合材料结构，但机器人会产生可能损害组件结构完整性的奇点[1-2]。本研究的目的是表征和预测复合材料的拉伸响应，包括“间隙”和“重叠”。制造了几种AFP碳/环氧层压板，随后在高压灭菌器中固化。为了深入了解与每个afp构型相关的微观结构和起皱模式，使用位于IRT saint - exupsamry的EasyTom 230 x射线计算机断层扫描(CT)系统对未测试的薄片进行检查(例如图1a)。为了表征它们的机械响应，研究人员在ONERA(通过数字图像相关和声发射辅助的平面和裸眼地层)进行了拉伸实验，并结合增量应力水平下的原位x射线断层扫描检查。与实验活动并行，开发了一种数值方法来预测afp优惠券的最终强度。有限元模型基于CT结果(如图1b)对接头几何形状的真实描述，并使用Abaqus/Standard与Onera的渐进失效模型(OPFM)[3]进行计算。
{"title":"Tensile Response of Automated Fibre Placement (AFP) Coupons Including Gaps and Overlaps: Experiments vs. Simulations","authors":"S. García Rodriguez, A. Chiappini, C. Huchette, S. Miot, C. Fagiano, L. Barrière","doi":"10.23967/composites.2021.089","DOIUrl":"https://doi.org/10.23967/composites.2021.089","url":null,"abstract":"While Automated Fibre Placement (AFP) enables the manufacturing of large and geometrically complex composite structures in relatively short cycle times, the robots induce singularities that may impair the structural integrity of the component [1-2]. The aim of this study is to characterize and predict the tensile response of composite coupons including “gaps” and “overlaps”. Several AFP carbon/epoxy laminates were manufactured and subsequently cured in the autoclave. To gain insight into the microstructure and wrinkling patterns associated to each AFP-configuration, non-tested coupons were inspected using an EasyTom 230 X-ray computed tomography (CT) system located at IRT Saint-Exupéry (e.g. Figure 1a). To characterize their mechanical response, a tensile experimental campaign was carried out at ONERA (plain and open-hole coupons assisted by digital image correlation and acoustic emission) combined with ex-situ X-ray tomography inspections at incremental stress levels. In parallel to the experimental campaign, a numerical methodology was developed to predict the ultimate strength of AFP-coupons. The finite-elements models relied on a realistic description of the coupon’s geometry based on the CT results (e.g. Figure 1b), and were performed using Abaqus/Standard coupled with Onera’s Progressive Failure Model (OPFM) [3].","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"26 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":"129230173","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/composites.2021.018
N. Rauter, I. Widera, R. Lammering
{"title":"Numerical - Experimental Approach for the Correlation Structure Determination of Short Fiber Reinforced Structures","authors":"N. Rauter, I. Widera, R. Lammering","doi":"10.23967/composites.2021.018","DOIUrl":"https://doi.org/10.23967/composites.2021.018","url":null,"abstract":"","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"21 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":"133643998","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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