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首页> 外文会议>Eighth International Fatigue Congress Vol.5, Jun 3-7, 2002, Stockholm, Sweden >LOW CYCLE THERMAL-MECHANICAL FATIGUE OF LOW CARBON STEEL IN THIN SHELL STRUCTURES: A PRACTICAL APPROACH
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LOW CYCLE THERMAL-MECHANICAL FATIGUE OF LOW CARBON STEEL IN THIN SHELL STRUCTURES: A PRACTICAL APPROACH

机译：薄壳结构中低碳钢的低循环热机械疲劳：一种实用方法

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摘要

Irregular, thin shells loaded purely by arbitrary thermal fields in a slow cyclic manner present a very difficult thermal-mechanical fatigue analysis problem. Until recently, neither the strain nor the material fatigue strength, the two conventional controlling engineering parameters required to evaluate fatigue reliability, were known with sufficient accuracy to be used. Only time-consuming prototype fabrication and actual thermal cycling could be used to eventually establish acceptable reliability of the thin shell devices. Recently this problem has been solved by using a unique methodology combining finite element analysis, thermal imaging and the determination of thermal-mechanical fatigue strength of the base material. This has allowed solution of the full field strain, and its correlation to fatigue life. The new methodology has resulted in a significant decrease in development time and cost for the thin shell devices and provided a solution to a class of problem hitherto unsolvable.
机译：不规则的薄壳以缓慢的循环方式完全由任意热场加载，这是一个非常困难的热机械疲劳分析问题。直到最近，还没有以足够的精度使用应变或材料疲劳强度，这是评估疲劳可靠性所需的两个常规控制工程参数。只有耗时的原型制造和实际的热循环才能用于最终建立薄壳设备的可接受的可靠性。最近，已经通过使用一种独特的方法解决了这个问题，该方法结合了有限元分析，热成像和确定基材的热机械疲劳强度。这样就可以解决全场应变及其与疲劳寿命的关系。新方法已大大减少了薄壳设备的开发时间和成本，并为迄今为止无法解决的一类问题提供了解决方案。

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