摘要
建立球形压痕试验三维有限元模型,通过单一变量法模拟了压痕载荷与不同材料力学性能参数(弹性模量90~210 GPa、屈服强度180~300 MPa、应变硬化指数0.1~0.3)的关系;在125组力学性能参数组合下进行球形压痕试验有限元模拟,得到基于压痕载荷的材料力学性能参数计算公式并进行了试验验证。结果表明:压痕载荷与弹性模量和屈服强度存在对数线性关系,其对数与应变硬化指数之间同样存在线性关系;将球形压痕试验测定得到的L450管线钢的压痕载荷代入材料力学性能参数计算公式,得到的弹性模量、屈服强度和应变硬化指数与拉伸试验结果的相对误差分别为-2.347%,-1.915%,-2.740%,说明基于压痕载荷的材料力学参数计算方法可以满足工程需要。
A three-dimensional finite element model was developed for ball indentation tests, and the relationships between indentation load and mechanical properties parameters of different materials(elastic modulus of 90~210 GPa, yield strength of 180~300 MPa, strain hardening exponent of 0.1~0.3) were simulated by the single variable method.The finite element simulation of the ball indentation test was carried out with 125 sets of mechanical property parameters, and the calculation equations of the mechanical property parameters based on the indentation load were obtained and verified experimentally.The results show that the indentation load is log-linearly related to the elastic modulus and yield strength, and its logarithm is also linearly related to the strain hardening exponent.By substituting the indentation load of L450 pipeline steel measured by the ball indentation test into the equation for mechanical properties of the material, the relative errors of the elastic modulus, yield strength and strain hardening exponent obtained from the tensile test results are-2.347%,-1.915%,and-2.740%,respectively, indicating that the method of calculating mechanical parameters of the material based on the indentation load can meet the engineering needs.
作者
薛河
路景智
贾宇磊
王帅
XUE He;LU Jingzhi;JIA Yulei;WANG Shuai(School of Mechanical Engineering,Xi′an University of Science and Technology,Xi′an 710054,China)
出处
《压力容器》
北大核心
2022年第7期7-14,共8页
Pressure Vessel Technology
基金
国家自然科学基金项目“在役核电焊接结构裂尖微观区域环境致裂扩展驱动力演化规律及定量表征”(52075434)
陕西省重点研发计划项目“焊接接头材料力学性能微/纳米压痕实验标定方法研究”(2021KW-36)。
关键词
L450管线钢
球形压痕试验
压痕载荷
力学性能参数
有限元模拟
L450 pipeline steel
ball indentation test
indentation load
mechanical property parameters
finite element simulation
