Dynamic Failure & Damage Mechanisms

Through sophisticated analytical, numerical and simulation capabilities, we aim to achieve the following specific technical objectives in this research thrust:

· Develop modeling approaches that are able to accurately incorporate nanoscale information such as grain boundary properties and microscale information such as microstructure and the morphology of grain boundary networks into macroscale predictions of overall response and of the inherent variability of that response

· Develop an understanding of the coupling between the failure mechanisms in the material (such as shear bands) and the microstructure of the material, e.g., what microstructures control shear band density in metallic glass matrix composites (MGMCs)?

· Develop physics-based models for the problems of spallation in ductile materials, massive fragmentation processes and the coupling of failure mechanisms such as shear bands and cracks.

Achievement of these objectives will provide us with the mechanistic basis for the design and development of dramatically more capable material systems for impact applications.

 Long-Range Objectives

· Characterize micromechanisms of dynamic deformation and failure developed within the other CAMCS thrusts

· Develop physics-based models for the massive failure of lightweight metallic systems

· Develop mechanism-based models for the evolution of damage within heterogeneous materials under dynamic loading

Evolution of void size distribution under high-rate extension

Modeling and Simulation of Dynamic Failure

CRG