内容介绍：Chapter 11 Alternating Stress(Alternating Stress)第十一章 交变应力（Alternating stress）§11–1 交变应力与疲劳失效(Alternating stress and fatigue failure) §11–2 交变应力的循环特征、应力幅和平 均应力(The cycle symbol,stress amplitudeand mea