The Role of Microstructure in Mixed Mode Fracture

本研究计划的目的是研究含有两种类型沉淀物的铝合金的混合模式断裂。通过平面应变和弯曲试验，研究了拉伸和压缩变形行为。地形和剪切局部化的程度，空洞的成核和生长，以及断口分析，随后为试样具有不同的颗粒尺寸和颗粒间距。表面粗糙度的确定和表面塑性不稳定性。对两相界面附近的位错-裂纹尖端构型进行了理论计算。

The objective of this research program is to study mixed-mode fracture of aluminum alloys containing two types of precipitates. Deformation behavior is examined in tension and compression, using plane strain and bend tests. The topography and extent of shear localization, void nucleation and growth, and fractography are followed for specimens with different particle sizes and particle spacings. Surface roughness is determined and related to surface plastic instability. Theoretical calculations are carried out for dislocation-crack tip configurations near a two-phase interface.