PRACTICAL IMPLEMENTATION OF THE DOUBLE LINEAR DAMAGE RULE AND DAMAGE CURVE APPROACH FOR TREATING CUMULATIVE FATIGUE DAMAGE
PRACTICAL IMPLEMENTATION OF THE DOUBLE LINEAR DAMAGE RULE AND DAMAGE CURVE APPROACH FOR TREATING CUMULATIVE FATIGUE DAMAGE
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DOI：
10.1007/bf00053519
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发表时间：
1981-01-01
影响因子：
2.5
通讯作者：
HALFORD, GR
中科院分区：
文献类型：
--
作者：
MANSON, SS;HALFORD, GR
简单的程序处理累积疲劳损伤在复杂的加载历史下使用损伤曲线的概念或双线性损伤规则。提供了一个单一的方程与损伤曲线的方法使用;每个加载事件提供了一个分数的损伤，直到失败时，假设发生的损伤总和成为一个单位。对于双线性损伤准则，给出了确定两个寿命阶段的解析表达式。该程序包括两个步骤，每个步骤类似于常用的线性损伤规则的常规应用。当基于第一阶段寿命的循环比之和达到1时，假定第一阶段完成，并且进一步的载荷被加和为基于第二阶段寿命的循环比。当第二阶段总和达到1时，假定发生故障。对于所述两种累积损伤方法中的任何一种，除了常规线性损伤规则分析中通常使用的物理性质或材料常数外，不需要其他物理性质或材料常数。这两种方法的说明和比较进行了讨论。
Simple procedures are presented for treating cumulative fatigue damage under complex loading history using either the Damage Curve concept or the Double Linear Damage Rule. A single equation is provided for use with the Damage Curve approach; each loading event providing a fraction of damage until failure is presumed to occur when the damage sum becomes unity. For the Double Linear Damage Rule, analytical expressions are provided for determining the two phases of life. The procedure involves two steps, each similar to the conventional application of the commonly used Linear Damage Rule. When the sum of cycle ratios based on Phase I lives reaches unity, Phase I is presumed complete, and further loadings are summed as cycle ratios based on Phase II lives. When the Phase II sum reaches unity, failure is presumed to occur. No other physical properties or material constants than those normally used in a conventional Linear Damage Rule analysis are required for application of either of the two cumulative damage methods described. Illustrations and comparisons of both methods are discussed.