纯弯曲梁的应力损伤失效分析和预测

A STRESS DAMAGE FAILURE ANALYSIS AND PREDICTION OF BEAMS UNDER PURE BENDING LOADS

  • 摘要: 本文提出了梁的弯曲应力损伤失效分析方法,推导了梁弯曲应力损伤基本方程,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。并且弯曲损伤模型的材料常数可由Kachanov拉伸损伤模型的材料常数确定。并且对应力损伤材料提出了便于工程应用的失效预测方程。

     

    Abstract: In this paper, based on the basic assumptions of stress damaged beams, simple evolution equations of stress damaged beams under pure bending are derived. The bending damage variable is defined as the reduction of moment of inertia similar to that of tensile damage variable in Kachanov's model which is defined as reduction of loading area. The material's constants of the equations can be determined by Kachanov's tensile damage model. The nature of stress damage failure of beams is discussed in details. For the simplicity of failure prediction in engineering, the evolution law of bending stress damage variable is transformed into a simple form.

     

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