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

系统地研究了金属在微米尺度上的力学行为，建立了基于物理的梯度晶体塑性理论。在实验部分，对铝和铜单晶箔进行了弯曲方向相反的微弯曲试验。结果表明，由于几何上必要的位错（GNDs）排列不均匀，弯曲箔试样中存在内应力，而内应力作为背应力存在。在理论部分，将GNDs的影响纳入梯度晶体塑性理论的框架中。

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.