A grain boundary damage model for delamination

作者：Messner M C; Beaudoin A J; Dodds R H Jr

来源：Computational Mechanics, 2015, 56(1): 153-172.

DOI：10.1007/s00466-015-1164-z

• Delamination
• Intergranular
• Aluminum-lithium
• Multiscale
• Damage

Intergranular failure in metallic materials represents a multiscale damage mechanism: some feature of the material microstructure triggers the separation of grain boundaries on the microscale, but the intergranular fractures develop into long cracks on the macroscale. This work develops a multiscale model of grain boundary damage for modeling intergranular delamination-a failure of one particular family of grain boundaries sharing a common normal direction. The key feature of the model is a physically-consistent and mesh independent, multiscale scheme that homogenizes damage at many grain boundaries on the microscale into a single damage parameter on the macroscale to characterize material failure across a plane. The specific application of the damage framework developed here considers delamination failure in modern Al-Li alloys. However, the framework may be readily applied to other metals or composites and to other non-delamination interface geometries-for example, multiple populations of material interfaces with different geometric characteristics.

• 出版日期2015-7