The indentation test is one of the most commonly employed techniques for the characterization of mechanical properties of materials. It is an efficient and useful tool for the evaluation of mechanical properties of small volumes of materials, e.g., hardness, elastic modulus and fracture toughness, etc., through analyzing the relationship between contact force and contact depth on the indented specimens. As the contact depth is sensitive to the pile-up or sink-in of the indented specimens, crystal plasticity finite element method is used to study the phenomena of pile-up/sink-in during the spherical indentation simulation. The effects of single crystal plasticity material parameters on both the pile-up or sink-in behavior and macroscopic mechanical properties are studied. By comparing the effects of both macroscopic material parameters and crystal plasticity material parameters on the pile-up or sink-in behavior, the relationship between crystal plasticity material parameters and contact depth is revealed.

压痕测试是表征材料机械性能的最常用技术之一。通过分析压痕样品上的接触力和接触深度之间的关系，它是评估少量材料的机械性能（例如硬度，弹性模量和断裂韧性等）的有效工具。由于接触深度对压痕试样的堆积或下沉敏感，因此采用晶体塑性有限元方法研究球形压痕模拟过程中的堆积/下沉现象。研究了单晶可塑性材料参数对堆积或下沉行为以及宏观力学性能的影响。