（4 ）Nelson 累积失效模型（Cumulative Exposure Model, CEM）：样本的残存寿命仅依赖于 已累积的失效和当前应力，而与累积方式无关。
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对数累积损伤模型作为—个失效判据，已在某中口径自动舰炮输弹簧的疲劳寿命预测中得到较满意的应用。
Used as a fatigue failure criterion, application of the model to the fatigue life prediction for the feeding spring of a medium calibre automatic naval gun proved to be comparatively satisfactory.
证明了递减反向失效率(DRHR)性质关于卷积运算封闭，同时证明了该性质在累积发生率是凹的非齐次泊松冲击模型中也封闭。
It is also shown that the DRHR property can be preserved under non-homogeneous Poisson shock model with increasing concave cumulative rate of occurrence.
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