考察了疲劳过程中刚度下降和疲劳裂纹产生情况。
The macroscopic fatigue behavior was characterized in terms of stiffness reduction and fatigue cracks.
本文提出了考虑残余应变刚度下降的复合材料疲劳累积损伤模型。
The research work in this paper is included following: 1, A fatigue model based on the 'Strain Equivalent Hypothesis' is presented.
通过对其疲劳性能的实验研究，发现裂纹扩展速率的大小及刚度的下降与加载的最大循环应力密切相关的规律。
The fatigue properties were researched and found that the crack propagation velocity and the decline of rigidity were related to the maximum cycle stress.
为使第二阶模态频率避开发动机一阶惯性力频率，文中对扶手架的质量、刚度进行局部修改，结果使手把振动有较大幅度的下降。
To separate these frequencies, we make a local modification to mass and stiffness of the handle and results in the vibration on the handle of walking tractor to reduce considerably.
预浸料工艺性能的差异及桨叶刚度不足是造成产品寿命下降的主要原因。
Difference of prepreg technique and the tail rotor rigidity were the key resulting in product life decline.
结果表明：皮肤的刚度随热损伤度的提高而下降，并且具有不同损伤度下的应变速率敏感性，这些特性主要是由皮肤的水合作用变化所引起的。
The results demonstrate that skin stiffness decreases with increasing thermal damage degree and there exist strain rate sensitivity at different damage levels, caused mainly by hydration changes.
优化后，结构固有频率及刚度变化不大，而床身质量却大大下降，取得明显效果。
After these, the structural natural frequency changes a little, but the grinder bed mass reduces greatly, thus the obvious result is achieved.
随着桥梁跨度的不断增加，桥梁的长细化使其刚度和阻尼不断下降。
As the increases of bridge span, the change of long and narrow declining it's stiffness and damping.
随着桥梁跨度的不断增加，桥梁的长细化使其刚度和阻尼不断下降。
As the increases of bridge span, the change of long and narrow declining it's stiffness and damping.
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