材料裂纹体J～Q断裂准则的工程化方法研究

ENGINEERING TREATMENT METHOD FOR J^Q THEORY OF CRACKED STRUCTURE

结合现有材料裂纹体断裂参量的表达式,详细讨论了均匀材料裂纹体的J^Q 双参数准则,并对该准则中各参量的计算方法进行了简化。为了工程应用方便,进一步分析了Q 参量有限元数值解的分布规律,并曲线拟合得到了该参量的工程化计算方法,最后对工程化Q 参量计算方法在断裂参量计算中的有效性进行了讨论。

Based on the solution of stress-strain field of cracked structures, the double-parameter J-Q theory of homogeneous materials is discussed. The parameters in the theory are analyzed for engineering application, and the value of the parameter Q is calculated by the finite element method. As a result, the distribution of Q parameter is obtained. The effectiveness of the present method for assessing the safety of the cracked structure is discussed.