梁的蠕变脆断弯曲损伤Norton分析和预测

A CREEP DAMAGE ANALYSIS OF BEAMS UNDER PURE BENDING

提出了纯弯曲梁的蠕变脆断损伤失效分析方法。与Ｋａｃｈａｎｏｖ的材料受载横截面减少 定义拉伸损伤变量类似，以梁的弯曲惯性矩减少定义弯曲损伤变量。为了讨论问题的广泛性， 应力和应交关系采用Ｎｏｒｔｏｎ非线性关系。推导了梁的弯曲蠕变脆断损伤基本方程，其中的材 料常数可由Ｋａｃｈａｎｏｖ拉伸损伤模型的材料常数确定。并且提出了便于工程应用的蠕变失效预 测方程。

This paper is concerned with the evolution equations of creep damage beams under pure bending. The reduction of moment of inertia is defined as the bending damage variable. The material constants of the equations are determined by Kachanov's tensile damage model. The nature of creep damage failure of beams is discussed in details. For the convenience of failure prediction in engineering, the evolution equation of bending damage variable is simplified.