沸石分子筛单晶体弹塑性双线性本构关系的实验研究与有限元确定

THE DETERMINATION OF BILINEAR ELASTIC-PLASTIC CONSTITUTIVE RELATION OF ZEOLITE CRYSTALS

为研究两种沸石分子筛方钠石SOD和镁碱沸石FER的力学性能,采用纳米压痕技术,测得随载荷连续变化的位移,得到载荷-位移曲线图.根据Olive算法,利用接触刚度连续测量技术,得到这两种沸石分子筛的硬度及弹性模量.基于弹塑性双线性本构关系假定,用ANSYS有限元程序模拟纳米压痕实验过程,利用搜索法得到沸石大单晶SOD和FER的双线性本构关系.

The research of the determination of the mechanical properties of SOD and FER was reported in this paper. The experiment was measured directly by using MTS nano Indenter XP. The load-dis-placement curve of SOD and FER was obtained. Based on the calculation method given by Oliver and continuous stiffness measurement （CSM）, the hardness and the elastic modulus of two kinds of zeolite crystal were found. Then, according to the bilinear elastic-plastic material hypothesis, the indention processes were simulated with the ANSYS finite element code. The bilinear elastic-plastic constitutive relations of Zeolite sodalite and ferrierite crystals were gained from a number of finite element simulations using search method.