Safety life of crane was determined by its fatigue intensity of metal structure.
起重机的安全寿命取决于其金属结构的疲劳强度。
The crane's metal structure intensity calculation and fatigue analysis is a fully complicated problem.
起重机金属结构的强度计算及疲劳分析是十分复杂的问题。
The results show that the closed finned tube is much more excellent than the opening finned tube on gross heat, heat of unit volume and metal thermal intensity with the same geometric parameters.
观察发现，几何参数相同时，封闭式翅片形式在总散热量、单位体积散热量和金属热强度方面均优于开放式翅片形式。
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