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首页> 外文期刊>International Journal of Solids and Structures >Micromechanical modeling of the microbond test to quantify the interfacial properties of fiber-reinforced composites
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Micromechanical modeling of the microbond test to quantify the interfacial properties of fiber-reinforced composites

机译：微粘结测试的微力学建模，以量化纤维增强复合材料的界面性能

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摘要

The present study has focused on achieving a micromechanical understanding of the microbond test, which involves pulling a fiber out of a bead of matrix (i.e. droplet) through a knife-edge, in order to quantify the interfacial fracture properties of fiber-reinforced composites. According to the microbond test results for carbon-fiber and epoxy-resin system, matrix cracking occurred during the fiber pullout, in addition to the debonding at the fiber-matrix interface. Therefore, in evaluating the fracture properties of the fiber-matrix interface, we should pay attention to the coupling effects of matrix failure and interfacial debonding on the test results. Then, we discuss how to best extract the interfacial properties while excluding the influence of matrix plasticity and cracking, using numerical simulations. The key mechanism demonstrated here is that the pullout force, in the cases where the influence of matrix cracking is negligible, appears as the upper limit among the experimental data of the pullout force for a constant initial embedded length of the fiber in the matrix. For this reason, the upper-limit data all over the range of embedded fiber length in experiments can be reasonably evaluated by the simulation focusing on the debonding process with matrix plasticity. This evaluation technique is effective as a way of extracting interfacial properties appropriately from microbond test results.
机译：本研究着重于对微粘合测试的微观力学理解，该测试涉及通过刀口将纤维从基质珠粒（即小滴）中拉出，以量化纤维增强复合材料的界面断裂性能。根据碳纤维和环氧树脂系统的微粘合测试结果，除在纤维-基质界面处的脱粘外，在纤维拉出过程中还会发生基体开裂。因此，在评估纤维-基体界面的断裂特性时，应注意基体破坏和界面剥离对测试结果的耦合影响。然后，我们讨论了如何使用数值模拟在排除基体塑性和开裂影响的同时，最佳地提取界面性质。在此说明的关键机理是，在基体纤维的初始嵌入长度恒定的情况下，在基体开裂的影响可忽略不计的情况下，拉出力作为拉力的实验数据中的上限出现。因此，通过侧重于具有基体可塑性的脱胶过程的仿真，可以合理地评估实验中整个包埋纤维长度范围内的上限数据。这种评估技术可以有效地从微键测试结果中适当提取界面特性。

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