Pub Date : 2021-09-01DOI: 10.23967/composites.2021.082
M. Fagerström, G.Catalanotti, R. Weerts, O. Cousigné, Klaas Kunze, M. Geers, J. Remmers
Composite-overwrapped pressure vessels are typically used to store gases such as hydrogen under high pressure. Internal damage due to an impact may reduce the strength of the vessel
复合包裹压力容器通常用于在高压下储存氢气等气体。撞击造成的内部损伤可能会降低容器的强度
{"title":"The Influence of the Internal Pressure on the Impact Behavior of Composite-Overwrapped Pressure Vessels","authors":"M. Fagerström, G.Catalanotti, R. Weerts, O. Cousigné, Klaas Kunze, M. Geers, J. Remmers","doi":"10.23967/composites.2021.082","DOIUrl":"https://doi.org/10.23967/composites.2021.082","url":null,"abstract":"Composite-overwrapped pressure vessels are typically used to store gases such as hydrogen under high pressure. Internal damage due to an impact may reduce the strength of the vessel","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126776991","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 : 2021-09-01DOI: 10.23967/composites.2021.083
A. Mousavi, B. Arash, R. Rolfes
Adding boehmite nanoparticles inside epoxy materials shows outstanding potential in improving the fracture properties. Coarse-grained models for pure epoxy and agglomerated boehmite nanoparticle/epoxy nanocomposites with initial single-edged cracks are developed. An optimization assisted modified iterative Boltzmann inversion method is proposed to calibrate coarse-grained force fields. Furthermore, the coarse-grained force field of nanoparticles is obtained using the strain energy conservation between coarse-grained models and all-atom systems [1]. In the proposed model, the energy release rate is obtained from the load-displacement curve of specimens [2]. Due to the size of the agglomerated boehmite nanoparticles, the molecular dynamic approach is not able to capture the fracture properties of agglomerated boehmite nanoparticle/epoxy nanocomposite; therefore, the existence of a coarse-grained model is crucial. The applicability of the coarse-grained model to estimate the fracture properties of the polymer reinforced nanocomposites is evaluated using experimental data. It is shown that the fracture properties of the nanocomposites depend on the weight fraction and distribution of nanoparticles. The dependence of the critical energy release rate on the initial crack length is also studied.
{"title":"Fracture Properties of Agglomerated Nanoparticle Reinforced Polymers: A Coarse-Grained Model","authors":"A. Mousavi, B. Arash, R. Rolfes","doi":"10.23967/composites.2021.083","DOIUrl":"https://doi.org/10.23967/composites.2021.083","url":null,"abstract":"Adding boehmite nanoparticles inside epoxy materials shows outstanding potential in improving the fracture properties. Coarse-grained models for pure epoxy and agglomerated boehmite nanoparticle/epoxy nanocomposites with initial single-edged cracks are developed. An optimization assisted modified iterative Boltzmann inversion method is proposed to calibrate coarse-grained force fields. Furthermore, the coarse-grained force field of nanoparticles is obtained using the strain energy conservation between coarse-grained models and all-atom systems [1]. In the proposed model, the energy release rate is obtained from the load-displacement curve of specimens [2]. Due to the size of the agglomerated boehmite nanoparticles, the molecular dynamic approach is not able to capture the fracture properties of agglomerated boehmite nanoparticle/epoxy nanocomposite; therefore, the existence of a coarse-grained model is crucial. The applicability of the coarse-grained model to estimate the fracture properties of the polymer reinforced nanocomposites is evaluated using experimental data. It is shown that the fracture properties of the nanocomposites depend on the weight fraction and distribution of nanoparticles. The dependence of the critical energy release rate on the initial crack length is also studied.","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114381924","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 : 2021-09-01DOI: 10.23967/composites.2021.123
S. Pinho, M. Matos, R. Costa, A. Ibbotson, M. Ostergaard
{"title":"Enabling Multiscale Analysis of Very Large Composite Structures","authors":"S. Pinho, M. Matos, R. Costa, A. Ibbotson, M. Ostergaard","doi":"10.23967/composites.2021.123","DOIUrl":"https://doi.org/10.23967/composites.2021.123","url":null,"abstract":"","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124825586","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 : 2021-09-01DOI: 10.23967/composites.2021.036
C. Breite, S. Lomov, Y. Swolfs
The recent development of a high precision fibre segmentation method by Emerson et al. [1] enabled the automated identification of fibre breaks in unidirectional composites (Breite et al. [2]). It is now possible to investigate the correlation of microstructural parameters of the fibre trajectories with the formation of fibre breaks and clusters of fibre breaks. The dataset used in the present study is based on the fibre trajectories segmented from a volume of ~0.36 mm 3 , taken out from a flat sample, in-situ loaded under synchrotron radiation computed tomography to a tensile stress corresponding to 91% of the ultimate tensile stress. It consists of ~5000 fibres, ~9∙10 5 fibre segments of ~6.5 μm length and 92 fibre breaks. Statistical comparisons have been performed for the local fibre volume fraction, fitted sinusoidal parameters as measures for the local fibre waviness and the local in-plane and out-of-plane fibre angles measured in each of the fibre segments. The statistical methodology relies on repeated resampling from large population down to the size of the sparsely populated fibre breaks data. Insights were gained on differences between distributions of the microstructure parameters near broken fibres vs. un-broken fibres, fibre break sites vs. intact regions and single fibre break sites vs. clustered fibre break sites (Figure 1). In contrast to earlier work by Rosini et al. [3], the present work demonstrates a previously unknown link between the local disturbance of the alignment angles and the formation of fibre break clusters. This result highlights a major drawback in most state-of-the-art tensile failure models, which do not consider the micro-scale misalignment
Emerson等人[1]最近开发了一种高精度纤维分割方法，可以自动识别单向复合材料中的纤维断裂(Breite等人[2])。现在有可能研究纤维轨迹的微观结构参数与纤维断裂和纤维断裂簇的形成之间的相关性。本研究中使用的数据集是基于从~0.36 mm 3的体积中分割的纤维轨迹，从平面样品中取出，在同步辐射计算机断层扫描下原位加载，拉伸应力对应于最终拉伸应力的91%。它由~5000根纤维、~9∙10 5根长度为~6.5 μm的纤维段和92根纤维断裂组成。对局部纤维体积分数进行了统计比较，拟合的正弦参数作为局部纤维波纹度的测量，以及在每个纤维段中测量的局部面内和面外纤维角度。统计方法依赖于从大量人口到稀疏人口的纤维断裂数据的重复重新采样。研究人员深入了解了断裂纤维与未断裂纤维、纤维断裂位点与完整区域、单个纤维断裂位点与成簇纤维断裂位点之间微观结构参数分布的差异(图1)。与Rosini等人的早期工作[3]相反，本研究表明，在定向角的局部扰动与纤维断裂簇的形成之间存在先前未知的联系。这一结果突出了大多数最先进的拉伸破坏模型的一个主要缺点，即不考虑微观尺度的错位
{"title":"On Correlations Between Local Microstructure and The Appearance of Fibre Breaks in Unidirectional Composite Materials","authors":"C. Breite, S. Lomov, Y. Swolfs","doi":"10.23967/composites.2021.036","DOIUrl":"https://doi.org/10.23967/composites.2021.036","url":null,"abstract":"The recent development of a high precision fibre segmentation method by Emerson et al. [1] enabled the automated identification of fibre breaks in unidirectional composites (Breite et al. [2]). It is now possible to investigate the correlation of microstructural parameters of the fibre trajectories with the formation of fibre breaks and clusters of fibre breaks. The dataset used in the present study is based on the fibre trajectories segmented from a volume of ~0.36 mm 3 , taken out from a flat sample, in-situ loaded under synchrotron radiation computed tomography to a tensile stress corresponding to 91% of the ultimate tensile stress. It consists of ~5000 fibres, ~9∙10 5 fibre segments of ~6.5 μm length and 92 fibre breaks. Statistical comparisons have been performed for the local fibre volume fraction, fitted sinusoidal parameters as measures for the local fibre waviness and the local in-plane and out-of-plane fibre angles measured in each of the fibre segments. The statistical methodology relies on repeated resampling from large population down to the size of the sparsely populated fibre breaks data. Insights were gained on differences between distributions of the microstructure parameters near broken fibres vs. un-broken fibres, fibre break sites vs. intact regions and single fibre break sites vs. clustered fibre break sites (Figure 1). In contrast to earlier work by Rosini et al. [3], the present work demonstrates a previously unknown link between the local disturbance of the alignment angles and the formation of fibre break clusters. This result highlights a major drawback in most state-of-the-art tensile failure models, which do not consider the micro-scale misalignment","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127630993","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 : 2021-09-01DOI: 10.23967/composites.2021.057
K. Anam, M. Todt, H. Pettermann
simulation of progressive delamination in multilayered laminate components
多层叠合件中渐进分层的模拟
{"title":"Computationally Efficient Modeling of Delamination Behavior in Laminated Composites","authors":"K. Anam, M. Todt, H. Pettermann","doi":"10.23967/composites.2021.057","DOIUrl":"https://doi.org/10.23967/composites.2021.057","url":null,"abstract":"simulation of progressive delamination in multilayered laminate components","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"2007 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127307305","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 : 2021-09-01DOI: 10.23967/composites.2021.044
A. Schlothauer, G. Pappas, P. Ermanni
{"title":"Mechanical Response of Highly Deformable thin Shell Composites","authors":"A. Schlothauer, G. Pappas, P. Ermanni","doi":"10.23967/composites.2021.044","DOIUrl":"https://doi.org/10.23967/composites.2021.044","url":null,"abstract":"","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130846957","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 : 2021-09-01DOI: 10.23967/composites.2021.048
T. Do, P. Karamian
{"title":"Evaluation of the Influence of the Matrix-inclusion Interface Based on FFT Methods","authors":"T. Do, P. Karamian","doi":"10.23967/composites.2021.048","DOIUrl":"https://doi.org/10.23967/composites.2021.048","url":null,"abstract":"","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125352728","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 : 2021-09-01DOI: 10.23967/composites.2021.107
S. Chaibi, C. Bouvet, F. Laurin, J. Rannou, J. Berthe, F. Congourdeau
This work is dealing with an experimental and numerical study of the behavior and strength of a carbon/epoxy toughened composite material subjected to low-velocity impact [1]. A specific experimental device has been developped to monitor the evaluation of damage mechanisms during a low-velocity impact, using advanced instrumentation technologies (such as IR thermography and digital image correlation associated with superfast cameras) (Figure 1). Additionally, 3D nondestructive evaluation methods (X-ray tomography, ultrasonic scans) are considered in order to assess and understand the damage mechanisms in such a material. The tests have been simulated using a 3D FEM with contacts, a continuum damage model for the intra-ply damage (fiber failure and matrix damage) [2] and delamination modeling using cohesive elements. The impact problem is solved using an implicit solver while taking into account several sources of nonlinearities (geometrical, material and contacts). Experimental and numerical comparisons will be presented and discussed in order to evaluate the predictive capabilities of the proposed approach.
{"title":"Prediction of Damages Induced by a Low-Velocity Impact on Last Generation Composite Laminates","authors":"S. Chaibi, C. Bouvet, F. Laurin, J. Rannou, J. Berthe, F. Congourdeau","doi":"10.23967/composites.2021.107","DOIUrl":"https://doi.org/10.23967/composites.2021.107","url":null,"abstract":"This work is dealing with an experimental and numerical study of the behavior and strength of a carbon/epoxy toughened composite material subjected to low-velocity impact [1]. A specific experimental device has been developped to monitor the evaluation of damage mechanisms during a low-velocity impact, using advanced instrumentation technologies (such as IR thermography and digital image correlation associated with superfast cameras) (Figure 1). Additionally, 3D nondestructive evaluation methods (X-ray tomography, ultrasonic scans) are considered in order to assess and understand the damage mechanisms in such a material. The tests have been simulated using a 3D FEM with contacts, a continuum damage model for the intra-ply damage (fiber failure and matrix damage) [2] and delamination modeling using cohesive elements. The impact problem is solved using an implicit solver while taking into account several sources of nonlinearities (geometrical, material and contacts). Experimental and numerical comparisons will be presented and discussed in order to evaluate the predictive capabilities of the proposed approach.","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126245523","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 : 2021-09-01DOI: 10.23967/composites.2021.124
G. Lubineau, P. Hu
The degradation modes of laminated composites have been studied for a long time. It is usual to distinguish between so-called “intralaminar” degradation mechanisms such as for example transverse cracks [1], and “interlaminar” mechanisms such as local or global delamination. One of the most difficult tasks is to accurately predict how these different mechanisms interact with each other. A well-known example is precisely the coupling between intra-and inter-laminar damage which significantly influences the mechanical response of laminates. These coupling mechanisms can be harmful (for example when transverse cracking accelerates degradation by local delamination of the interface) or beneficial (when transverse cracking activates new modes of interfacial dissipation, and in particular large-scale bridging mechanisms [2]). The objective of this presentation is to pave the way for a pragmatic and efficient modeling of these effects. For this, we first contribute to the enrichment of experimental knowledge on this point, by the systematic study of the evolution of the bridging of the interlaminar interface as a function of the density of intralaminar cracks. Original tests are developed, for which cross-ply composites are first pre-cracked under plane loading in order to introduce a pre-defined crack density. These sequences are then subjected to macroscopic delamination tests, in order to evaluate the effect of this pre-cracking on the interface tenacity. Secondly, a modeling approach is proposed, based on a new type of interface model [3]. Unlike the classical cohesive elements, which only consider the out-of-plane part of the
{"title":"Encounting for Intra/Interlaminar Coupling by Using both In-Plane and Out-of-Plane Strains in an Hybrid Interface Model","authors":"G. Lubineau, P. Hu","doi":"10.23967/composites.2021.124","DOIUrl":"https://doi.org/10.23967/composites.2021.124","url":null,"abstract":"The degradation modes of laminated composites have been studied for a long time. It is usual to distinguish between so-called “intralaminar” degradation mechanisms such as for example transverse cracks [1], and “interlaminar” mechanisms such as local or global delamination. One of the most difficult tasks is to accurately predict how these different mechanisms interact with each other. A well-known example is precisely the coupling between intra-and inter-laminar damage which significantly influences the mechanical response of laminates. These coupling mechanisms can be harmful (for example when transverse cracking accelerates degradation by local delamination of the interface) or beneficial (when transverse cracking activates new modes of interfacial dissipation, and in particular large-scale bridging mechanisms [2]). The objective of this presentation is to pave the way for a pragmatic and efficient modeling of these effects. For this, we first contribute to the enrichment of experimental knowledge on this point, by the systematic study of the evolution of the bridging of the interlaminar interface as a function of the density of intralaminar cracks. Original tests are developed, for which cross-ply composites are first pre-cracked under plane loading in order to introduce a pre-defined crack density. These sequences are then subjected to macroscopic delamination tests, in order to evaluate the effect of this pre-cracking on the interface tenacity. Secondly, a modeling approach is proposed, based on a new type of interface model [3]. Unlike the classical cohesive elements, which only consider the out-of-plane part of the","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116971327","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 : 2021-09-01DOI: 10.23967/composites.2021.073
S´ergio Costa, Hana Zrida, Miguel Herraez, Robin Olsson, Rickard ¨Ostlund
A mesoscale model for fibre kinking [2] is merged with a model for matrix fracture [1]. The fibre kinking behaviour is based on fibre kinking theory and finite deformation. The nonlin-ear behaviour is pressure dependent and is modelled by combining damage and friction on the fracture plane. The damage and fibre rotation due to kinking growth affects the transverse behaviour and vice-versa. The model shows efficiency considering the high complexity mech-anisms involved. For verification the model is tested against micro-mechanical FE simulations with multi-axial stress states such as σ 22 − σ 11 and τ 12 − σ 11 and against selected component tests. The combination of both models results in a high definition and physically-based 3D constitutive model for damage growth and crash of composite materials.
{"title":"Modelling Damage Growth Using a Physically-Based and Finite Deformation Model","authors":"S´ergio Costa, Hana Zrida, Miguel Herraez, Robin Olsson, Rickard ¨Ostlund","doi":"10.23967/composites.2021.073","DOIUrl":"https://doi.org/10.23967/composites.2021.073","url":null,"abstract":"A mesoscale model for fibre kinking [2] is merged with a model for matrix fracture [1]. The fibre kinking behaviour is based on fibre kinking theory and finite deformation. The nonlin-ear behaviour is pressure dependent and is modelled by combining damage and friction on the fracture plane. The damage and fibre rotation due to kinking growth affects the transverse behaviour and vice-versa. The model shows efficiency considering the high complexity mech-anisms involved. For verification the model is tested against micro-mechanical FE simulations with multi-axial stress states such as σ 22 − σ 11 and τ 12 − σ 11 and against selected component tests. The combination of both models results in a high definition and physically-based 3D constitutive model for damage growth and crash of composite materials.","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"634 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133000314","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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