静态效应只影响最终断裂条件，而动态效应影响疲劳过程中的损伤演化规律和强度退化速率。
The static effect affects only ultimate fracture condition (the critical residual strength), while the dynamic effect affects damage evolution and residual strength degradation rate.
对于复杂载荷下的疲劳问题，应该把平均应力效应分为“静态效应”和“动态效应”两个方面。
It is proposed that mean stress effect should be divided into two aspects, i. e. static effect and dynamic effect for fatigue under complex loading.
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