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1·The fatigue breakage is one important of damage style in mechanic fractures. Forecasting structure fatigue life is very important.

疲劳破坏是机械结构的主要破坏形式之一，准确预测机械结构工作疲劳寿命至关重要。

2·Fork failure of a forklift truck mainly takes a form of plastic deformation exceeding allowable limit, fragile breakage and early stage fatigue breakage.

叉车货叉失效方式主要表现为塑性变形超差，脆性断裂和早期疲劳断裂。

3·It is found that inherent frequencies are much larger than pumping frequencies and resonance cannot emerge before and after optimization. Fatigue breakage is caused by overload mainly.

结果发现优化前后支架的固有频率都远大于激励频率，不会产生共振，疲劳破坏主要由载荷超重引起的。

4·The primary cause of breakage is that the dynamic stress exceeded the allowable fatigue limit of the beam, and another cause is that the structure of the beam is unreasonable.

通过计算证明引起断裂的根本原因是动应力超过了梁的许用疲劳极限，另一原因是梁的结构不合理。

5·Main failure modes of automobile water pump bearings are: breakage of shaft, wear and fatigue flaking of rolling contact surfaces.

水泵轴连轴承失效形式主要为：心轴断裂，心轴滚动表面、外圈沟(滚)道表面、滚动体表面的磨损和疲劳剥落及密封失效。

6·Die breakage or cracking is due to mechanical fatigue and occurs in cases where the dies are overloaded and local stresses are high.

模具破裂或产生裂纹是由于机械疲劳，并且是在模具过载和局部应力高等情况下发生的。

7·Both fibers feature plastic cladding to protect the fiber during buffer stripping and prevent breakage, while increasing fiber strength and reducing static fatigue in humid environments.

这两种纤维都具有塑料覆盖，在缓冲条剥落期间保护光纤，防止断裂，同时提高纤维强度和减少在潮湿环境中的静态疲劳。

8·It should be pointed out that upgrading the strength of materials to resist multi-shock fatigue is an effective approach to reduce the socket-breakage rate as well as to improve bit's service life.

并指出，提高材料抗多冲疲劳的强度将是减少钎头断裤率，延长其使用寿命的有效途径。