Development of a micron-scale plasticity theory and its engineering application

系统地研究了金属在微米尺度下的力学行为，建立了基于物理的梯度晶体塑性理论。在实验部分，对铝单晶箔和铜单晶箔进行了反向弯曲微弯试验。结果强烈表明，由于几何必要位错(GND)的不均匀排列，弯曲箔试件中存在作为背应力的内应力。在理论部分，将GNDS效应纳入到梯度晶体塑性理论框架中。

Mechanical behavior of metals at the micron scale were systematically investigated, and a physically-based gradient crystal plasticity theory has been formulated. In the experimental part of the study, microbend tests with reversal of bending direction were carried out on aluminium and copper single-crystal foils. The results strongly suggested that internal stresses, which act as back-stresses, existed in the bent foil specimens due to a non-uniform array of the geometrically necessary dislocations (GNDs). In the theoretical part, the effect of the GNDs was incorporated into a framework of gradient crystal plasticity theory.