铸造铝合金ZL116持久寿命预测探讨

Prediction discussion about stress rupture life of ZL116 cast aluminum alloy

通过一系列持久试验研究了铸造铝合金ZL116在200℃不同应力条件下的持久寿命,并采用等温线外推法模型和线性回归运算得到持久寿命双对数应力-时间曲线,获得了中值曲线公式、50%置信度99.9%存活率曲线公式和95%置信度97.7%存活率曲线公式,并将ZL116在200℃时的理论计算数据与试验数据进行比对。结果表明:理论计算数据与试验数据吻合良好,实现了通过给定持久强度预测持久寿命的可能性,节约了设计成本,提高了设备安全性。

The stress rupture life of ZL116 cast aluminum alloy under different stress conditions at 200℃was studied through a series of stress rupture tests.The double logarithmic stress-strain curve of stress rupture life was obtained by isotherm extrapolation model and linear regression operation.The median curve formula,50%confidence 99.9%survival rate curve formula,and 95%confidence 97.7%survival rate curve formula were obtained.The theoretical calculation data of ZL116 at 200℃were compared with the experimental data.The results showed that the theoretical calculation data matched well with the experimental data,realizing the possibility of predicting the stress rupture life through the given durability strength.This pethood could save design costs and improve the equipment safety.