失效准则对工程估算复合材料连接强度的影响

Usage of different failure vriteria in composite joint strength prediction based on poly technique

通过数值计算方法确定特征长度和特征曲线.以三种连接试验件作为分析对象,利用六种不同的失效准则进行失效判定和连接强度预估,并与实测结果进行对比.通过计算发现,利用不同的失效准则,预估的结果明显不同.其中Tsai-Wu准则的误差最大,其他五种失效准则中误差水平相当,对不同试验件各有优劣.因此,推荐使用相对简单的Yamada-Sun准则.

This paper determined the characteristic curve by means of the numerical analysis. Based on the present approach, comparison was made among six failure criteria for their ac- curacy to evaluate the failure modes and strength of three different joint specimens, the test data of which was available in the literature. The analysis results showed that the Tsai -Wu criterion was unacceptable because it brings large errors. The other five criteria present equal level of accuracy, but none of them had demonstrated consistently satisfied accuracy to all the three example specimens. The Yamada -Sun criterion was preferable for its simplicity and convenience to be applied.