Dynamic Crack Initiation and Growth in Bimaterial Interfaces

这项研究的目标是建立准确和物理上可证明的动态界面裂纹萌生和快速扩展准则。利用新开发的相干梯度传感器技术(CGS)和超高速摄影技术，将对双材料界面的近尖端变形场进行实验测量。双材料系统动态断裂的理论和三维数值研究将与实验并行进行。这将提供与实验的直接比较，并将确保光学测量的准确性。实时进行直接近尖端动态测量的能力将使我们能够研究惯性和速率敏感性对双材料系统的起始和传播韧性的影响。

The goal of the research is the establishment of accurate and physically demonstrable dynamic interfacial crack initiation and rapid crack growth criteria. Experimental measurement of the near-tip deformation fields at bimaterial interfaces will be performed by means of a newly developed Coherent Gradient Sensor technique (CGS) and ultra high speed photography. Theoretical and 3-D numerical studies of dynamic fracture in bimaterial systems will be conducted parallel to the experiments. These will provide direct comparison with the experiments and will ensure the accuracy of the optical measurements. The ability to perform direct near-tip dynamic measurements in real time will allow us to study the effects of inertia and rate sensitivity on the initiation and propagation toughness of bimaterial systems.