作者：王家梁1, 吕哲源1, 陈向前1, 肖富君2, 孙亮1
作者单位：1. 装甲兵工程学院机械工程系, 北京 100072;
2. 总装备部南京军事代表局, 江苏 南京 210024
关键词：陶瓷材料;仪器化压入;弹性模量;屈服强度;应变硬化指数
摘要：
该文以典型陶瓷材料Si3N4和Al2O3为例, 分别应用材料弹性模量仪器化压入测试中的两种代表性方法Ma方法和Oliver-Pharr方法, 对两种材料的仪器化压入测试结果进行计算。结果表明:Ma方法对陶瓷材料弹性模量的测试误差小于Oliver-Pharr方法。利用两种不同面角的四棱锥压头分别对Si3N4和Al2O3材料进行仪器化压入实验, 并结合有限元数值分析方法, 确定Si3N4材料的塑性参数(屈服强度y=7 800 MPa和应变硬化指数n=0.02)和Al2O3材料的塑性参数(屈服强度y=4 100 MPa和应变硬化指数n=0.025), 从而为进一步研究陶瓷材料力学性能参数仪器化压入识别方法提供一定的理论基础。
Instrumented indentation methodologies for determining the elastic-plastic properties of ceramic materials
WANG Jialiang1, LÜ Zheyuan1, CHEN Xiangqian1, XIAO Fujun2, SUN Liang1
1. Department of Mechanical Engineering, Academy of Armored Force Engineering, Beijing 100072, China;
2. Nanjing Military Representative Bureau, General Armament Ministry, Nanjing 210024, China
Abstract: Taking typical ceramic materials (Si3N4 and Al2O3) for example, the two representative methods of instrumented indentation for determining the elastic modulus of the materials (Ma method and Oliver-Pharr method) were employed to calculate the instrumented indentation results of Si3N4 and Al2O3. The results show that the testing error in the elastic modulus of ceramic materials determined from the Ma method is lower compared to the Oliver-Pharr method. The instrumented indentation experiments of Si3N4 and Al2O3 were conducted by respectively using two pyramid indenters of different face angles. In addition, the finite element analysis method was applied as well to determine the plastic parameters of Si3N4 (yield strength σy=7 800 MPa and strain hardening exponent n=0.02) and Al2O3 (yield strength σy=4 100 MPa and strain hardening exponent n=0.025). This paper has provided a theoretical foundation for further studying the instrumented indentation method of determining the mechanical properties of ceramic materials.
Keywords: ceramic materials;instrumented indentation;elastic modulus;yield strength;strain hardening exponent
2015, 41(6): 12-17 收稿日期: 2014-11-13;收到修改稿日期: 2015-1-20
基金项目: 军队科研计划项目(2014CJ011)
作者简介: 王家梁(1986-),男,北京市人,博士,研究方向为材料力学性能测试方法。
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