摘要
为了深入了解Ti-Si-N纳米复合表面的力学性能,尝试采用有限元方法对纳米压痕测量的加-卸载过程进行了模拟。详细介绍了该三维有限元仿真过程的各个细节,包括对标准Berkovich压头的建模和相关参数的确定,以及对Ti-Si-N表面模型边界条件、压头与表面接触方式和加-卸载方式的处理。采用有限元的非线性算法对一个Ti-Si-N表面纳米压痕测量的实验曲线进行了拟合。通过有限元仿真得到了Ti-Si-N样品的屈服极限和应力-应变关系。该研究表明,采用有限元仿真与纳米压痕测量相结合是研究纳米复合表面非线性塑性性能的有效方式。
In order to obtain the elastic and plastic properties of Ti-Si-N nano-composite coatings, the load-un- load process of nano-indentation test has been simulated with three-dimensional finite element model. All details of the FEM simulation are discussed, including the modeling of the standard Berkovich indenter and the determination of its parameters, the boundary conditions of Ti-Si-N coating, the contact mode between the indenter and the coating, and the loading and unloading mode. The non-linear finite element calculations are conducted to fit the indentation experi- ment curve of a Ti-Si-N composite coating. Through these FEM simulations, the yield stress and the stress-strain curve of the Ti-Si-N sample are obtained. It indicates that the combination of FEM simulation and nano-indentation test is an efficient way to investigate the nonlinear plastic properties of coatings.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2010年第8期73-76,共4页
Materials Reports
基金
国家自然科学基金项目(50845065)
内蒙古教育厅科研基金项目(NJ06077)
关键词
纳米压痕
有限元仿真
屈服极限
载荷-位移曲线
nano-indentation, FEM simulation, yield stress, load-displacement curves
