基于蠕变试验的ZChSnSb11-6应力松弛特性研究

Research on Stress Relaxation Characteristics of Babbitt Metal ZChSnSb11-6 Based on Creep Test

在相同温度下,对巴氏合金ZCh Sn Sb11-6做了蠕变试验,获得合金在Norton形式和指数形式下的稳态蠕变方程,并利用所得系数得到合金在两种形式下应力松弛计算公式。采用ANSYS有限元分析软件模拟巴氏合金ZCh Sn Sb11-6的应力松弛过程,得到松弛过程中的蠕变曲线,并比较了理论与有限元方法计算结果,两种方法相对误差不到0.5%。结果表明:在松弛过程中,Norton形式的蠕变速率比指数形式的蠕变速率小,且相比指数形式,Norton形式下的应力松弛计算公式精度更高,更适合于巴氏合金ZCh Sn Sb11-6.

Creep test of Babbitt metal ZChSnSbl 1-6 was conducted under the same temperature ,steady state creep equation of Norton form and exponential form was respectively obtained, and formula of stress relaxation based on creep coefficients was acquired. Stress relaxation process of Babbitt metal ZChSnSbl 1-6 was simulated by ANSYS, creep curve in stress relaxation process was obtained and relative error curve of stress relaxation between theory method and finite element method was less than 0.5%. The results show that creep rate of Norton form was smaller than that of exponential form, and computational accuracy of Norton form was higher than those of exponential form, which show that formula of stress relaxation based on Norton form was more suitable for Babbitt metal ZCh- SnSb 11-6.