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首页> 外文期刊>Journal of the Mechanics and Physics of Solids >3Dynamic crack growth along a polymer composite-Homalite interface
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3Dynamic crack growth along a polymer composite-Homalite interface

机译：3沿聚合物复合材料-霍马岩界面的动态裂纹扩展

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摘要

Dynamic crack growth along the interface of a fiber-reinforced polymer composite-Homalite bimaterial subjected to impact shear loading is investigated experimentally and numerically. In the experiments, the polymer composite-Homalite specimens are impacted with a projectile causing shear dominated interfacial cracks to initiate and subsequently grow along the interface at speeds faster than the shear wave speed of Homalite. Crack growth is observed using dynamic photoelasticity in conjunction with high-speed photography. The calculations are carried out for a plane stress model of the experimental configuration and are based on a cohesive surface formulation that allows crack growth, when it occurs, to emerge as a natural outcome of the deformation history. The effect of impact velocity and loading rate is explored numerically. The experiments and calculations are consistent in identifying discrete crack speed regimes within which crack growth at sustained crack speeds is possible. We present the first conclusive experimental evidence of interfacial crack speeds faster than any characteristic elastic wave speed of the more compliant material. The occurrence of this crack speed was predicted numerically and the calculations were used to design the experiments. In addition, the first experimental observation of a mother-daughter crack mechanism allowing a subsonic crack to evolve into an intersonic crack is documented. The calculations exhibit all the crack growth regimes seen in the experiments and, in addition, predict a regime with a pulse-like traction distribution along the bond line.
机译：实验和数值研究了沿纤维增强的聚合物复合材料-Homalite双材料界面的动态裂纹扩展。在实验中，聚合物复合材料-霍马岩样品受到弹丸的冲击，导致以剪切为主的界面裂纹开始并随后沿界面生长，其速度快于霍马岩的剪切波速度。使用动态光弹性结合高速摄影观察到裂纹的扩展。计算是针对实验配置的平面应力模型进行的，并且基于具有粘性的表面配方，当出现裂纹扩展时，该裂纹扩展会作为变形历史的自然结果出现。数值研究了冲击速度和加载速率的影响。实验和计算在确定离散的裂纹速度范围内是一致的，在该范围内可能以持续的裂纹速度进行裂纹扩展。我们提出界面裂纹速度的第一个结论性实验证据要比更柔顺的材料的任何特征弹性波速度快。通过数值预测了该裂纹速度的发生，并使用计算来设计实验。另外，首次实验观察到母子裂纹机制允许亚音速裂纹发展为音速裂纹。计算结果显示了在实验中看到的所有裂纹扩展状态，此外，还预测了沿粘结线具有脉冲状牵引力分布的状态。

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