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The yield surface in crystal plasticity can be approached from variousdirections during mechanical loading. We consider the competition betweennanoindentation and tensile loading towards plastic yielding. For this purpose,we develop a two-dimensional discrete dislocation model that is then utilizedto investigate the hardness and pop-in event statistics during nanoindentationof single crystal under tensile pre-stress. Indentation is performed by usingcylindrical (circular in 2D) indentation with varying radius and under bothdisplacement and load control. Tensile in-plane stress, varying from zero toyield strength, is assigned to investigate the effect of pre-stress on hardnessand pop-in statistics. At small indentation depths, the measured hardness isfound to be smaller for larger tensile pre-stress; therefore, we conclude thatnanoindentation can be used to detect plasticity. When indentation depth islarger, the effect of pre-stress is barely seen. Moreover, we discuss eventstatistics and the related effect of pre-stress.

Discrete Dislocation Dynamics Simulations of Nanoindentation with Pre-stress: Hardness and Statistics of Abrupt Plastic Events