基于三点弯小试样测量蠕变参数的理论分析  

Theoretical Interpretation of Creep Parameters from Three-point Bending Tests

作　　者：马渊睿[1] 周帼彦[1] 涂善东[1] 

机构地区：[1]华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室,上海200237

出　　处：《压力容器》2010年第6期21-27,58,共8页Pressure Vessel Technology

基　　金：国家自然科学基金资助项目(50835003);上海市自然科学基金资助项目(09ZR1408000)

摘　　要：通过三点弯小试样试验,推导出Norton方程蠕变参数的理论公式,实现了与传统单轴拉伸蠕变试验结果之间的转换。在此基础上建立了1Cr0.5Mo耐热钢小试样的三点弯有限元模型,分析了在550℃、恒载荷条件下的试样中心挠度、应力随时间的变化规律,得到蠕变参数,验证了三点弯试验获得材料蠕变性能的可行性,并模拟分析了影响结果的各种因素,发现结果对小试样的尺寸偏差相当敏感,制备试样的过程中要特别注意尺寸精度。Based on the Norton equation, the creep properties are derived from the three point bending specimen, and correlated with the conventional standard tensile test by using the beam bending theory. Finite element computation of the three - point bending creep test of 1 Cr0.5 Mo steel is carried out. The variation of central deflection and stress with time subjected to constant forces are analyzed and the creep parameters are estimated. The numerical results show that the method proposed in this paper is feasible to obtain creep parameters from the small bending specimen, and the result is influenced significantly by the dimension of specimen preparation, so it is important to pay attention to the machining accuracy.

关 键 词：三点弯 小试样 有限元 蠕变参数 

分 类 号：TQ175.73[化学工程—硅酸盐工业]