中文摘要：

选用六种常用或最新的多轴累积损伤模型，对不同种类阶梯谱下的LY12CZ铝合金试验数据进行损伤计算，统计了各模型总损伤计算值的准确率。统计结果表明，对于LY12CZ铝合金，六种模型在不同谱型下对两级阶梯谱的寿命预测能力有一定差别；没有一种累积损伤模型能同时对所有类型的两级阶梯谱具有最好的计算结果。

英文摘要：

Six accumulative damage models, which were common used or novel, were used to calculate the critical damages of the LY12CZ aluminum alloy under different kinds of 2-stage step loading spectra and the accuracy rate of each model was counted. Accord- ing to the comparison result, for a certain kind of spectra, the prediction capabilities of the six models have disparity, and none of them is the best model for all kinds of spectra.