自动球压痕法测试材料力学性能的机理和普适性研究

项目名称： 自动球压痕法测试材料力学性能的机理和普适性研究

项目编号： No.51475269

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 王威强

作者单位： 山东大学

项目金额： 83万元

中文摘要： 本课题采用理论分析、材料破坏性和自动球压痕无损试验研究、有限元数值模拟等方法，研究过程工业装备常用钢力学性能的无损测试方法及测试理论基础，主要包括：（1）研究球压痕变形及其与材料破坏性能相互关联的机理，提出由自动球压痕试验结果反求材料应力应变关系的方法；（2）以反求的应力应变关系和自动球压痕试验结果为基础，给出估算非幂强化材料屈服强度和抗拉强度的方法；（3）基于自动球压痕试验和压痕显微分析结果，提出估算材料冲击吸收能量和断裂韧度的方法；（4）研究残余压痕的应力集中和残余应力变化规律，分析评价对材料表面服役性能的影响，提出球压头选择准则。本课题研究为服役材料性能的无损测试提供可靠技术手段和方法，论证方法的普适性，并建立和完善测试理论体系，为工业装备的安全服役提供科学保障。

中文关键词： 力学性能；测试；自动球压痕；机理；普适性

英文摘要： In this proposal, the non-destructive testing method for steels used in process industry equipment and its theoretical basis will be studied by theoretical analysis, material`s destructive testing，automated ball indentation testing, and finite element numerical simulation methods, et al. The research content includes: (1)To research the mechanism of ball indentation deformation and its relation with the material rupture properties, and to establish a method reversing stress-strain relationship from the automated ball indentation test results; (2)To give a method of estimating the yield strength and tensile strength of non-power law hardening materials，which is based on the automated ball indentation test results and stress-strain relationship; (3)To propose a method of estimating material`s impact absorption energy and fracture toughness by the automated ball indentation test results and impression microanalysis; (4)To research the variation rule of the stress concentration and residual stress caused by the residual impression, to analyze and evaluate the effect of the residual indentation on the surface durable properties of materials in service, and to propose ball indenter selection criterion. The researchers will build a reliable technical method of the non-destructive testing for industrial material properties in service, demonstrate the univerality of the method, and provide the theoretical basis and scientific guarantee for the service safety of industrial equipment.

英文关键词： mechanical properties;test;automated ball indentation;mechanism;universality