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首页> 外文会议>Virtual European Conference on Fracture >A cohesive-based method to bridge the strain rate effect and defects of RTM-6 epoxy resin under tensile loading
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A cohesive-based method to bridge the strain rate effect and defects of RTM-6 epoxy resin under tensile loading

机译：基于衔接性的方法，以弥合拉伸载荷下RTM-6环氧树脂的应变率效应和缺陷

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The objective of the present work is to investigate the relationship between the strain rate effect of RTM-6 epoxy resin and the presence of defects under tensile loading by means of a numerical modelling approach. High-strain-rate tensile tests were conducted using a split Hopkinson tension bar (SHTB) test facility. Axial strains were locally measured within the gauge section of the sample using a high-speed stereo digital image correlation technique (high-speed 3D DIC). Additionally, quasi-static tensile tests were conducted to study the tensile behaviour over a wide range of strain rates. The dynamic experimental results showed an increase in strength and modulus, but also a noticeable reduction in the failure strain, compared to the quasi-static tests. Latter observation may be attributed to the effect of defects present in brittle polymeric materials. Defects lead to the generation of microcracks before the failure of samples, as confirmed by experimental observations. Two different cohesive models were therefore created to replicate the constitutive model of the material with and without defects. Through an inverse method fitting, the failure mechanism of cohesive elements was calibrated and the tensile behaviour at various strain rates was replicated. The results showed that the strain rate effect can be accurately simulated by implementing cohesive elements that mimic the presence of defects. The number of simulated defects that allows an accurate reproduction of the behaviour depends on the strain rate level and the material appears more sensitive to defects at high strain rates. Therefore, the present work validates the assumption of the relationship between strain rate effect and defects for brittle polymeric materials.
机译：本作作品的目的是研究RTM-6环氧树脂的应变率效应与借助于数值建模方法的拉伸负荷缺陷之间的关系。使用分裂霍普金森张力杆（SHTB）测试设施进行高应变速率拉伸试验。使用高速立体声数字图像相关技术（高速3D DIC），在样品的仪表部分内局部测量轴向菌株。另外，进行了准静态拉伸试验，以研究在广泛的应变率上的拉伸行为。与准静态试验相比，动态实验结果表明强度和模量的增加，也是失效应变的显着降低。后一种观察可归因于脆性聚合物材料中存在的缺陷的效果。如实验观察所证实，缺陷导致样品失败前的微裂纹产生。因此，创建了两个不同的凝聚模型以复制材料的本构模型，无缺陷。通过逆方法配件，校准粘结元件的失效机理，并复制各种应变率的拉伸行为。结果表明，通过实施模仿缺陷的存在的粘性元素，可以精确模拟应变速率效应。允许精确再现行为的模拟缺陷的数量取决于应变速率水平，并且材料对高应变率的缺陷看起来更敏感。因此，本作工作验证了脆性聚合物材料的应变率效应和缺陷之间的关系的假设。

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