40CrMnSiMoVA钢棒材和锻材裂纹扩展特性对比分析

Comparison Analysis for 40CrMnSiMoVA Bar and Forging Crack Growth Character

在分析40CrMnSiMoVA钢棒材和锻材力学性能的基础上,对其裂纹扩展特性进行了统计分析,并对其均值和方差进行了假设检验。结果表明:两种材料的裂纹扩展速率和寿命均随着裂纹的增加而增加;其裂纹扩展寿命的分散性均随裂纹长度的增加而减少;而其裂纹扩展速率的分散性,先随裂纹长度的增加而减小,达到一定程度后则随裂纹长度的增加而增加。锻材的分散性大于棒材。该结论对于了解该材料的裂纹扩展性能,合理使用材料均有积极的意义。

Based on study of mechanical performance of 40CrMnSiMoVA bar and forging, their crack growth character is statistically analyzed, mean value and variance are statistically tested. The result showed that crack growth rate and life of both material increase with crack increase, the divergence of crack growth life increases with crack length increases, the divergence of crack growth rate decreases at the beginning and increases in the end with crack length increase. The divergence of 40CrMnSiMoVA forging is larger than that of bar material. The results can be used for material selection and application.