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首页> 外文期刊>Key Engineering Materials >A Comparative Study on the Fatigue Evaluation for Weldments under Out-of plane Bending Load using Structural Stress and Hot Spot Stress
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A Comparative Study on the Fatigue Evaluation for Weldments under Out-of plane Bending Load using Structural Stress and Hot Spot Stress

机译：利用结构应力和热点应力进行平面外弯曲载荷下焊缝疲劳评估的比较研究

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摘要

Fatigue strength assessments with two types of load carrying fillet weldment under out-of-plane bending load have been carried out by using both hot spot stress and structural stress methods. Basis for the derivation of structural stress method is discussed in detail. Finite element analyses using shell elements models have been petfonned for the fatigue strength assessment of weldments. As a result of the fatigue strength evaluation for load carrying transverse fillet weldment, hot spot stress method is found to be consistent with structural stress method as well as measurement. Hot spot stress, however, estimated for the load carrying longitudinal fillet weldment exhibit large variation with respect to mesh size and element type while the calculated structural stress for the longitudinal fillet weldment is relatively independent of mesh size. The fatigue life estimation according to structural stress has been introduced with the master S-N curve.
机译：通过使用热点应力和结构应力方法，在平面外弯曲载荷下采用两种类型的承载角焊缝进行了疲劳强度评估。详细讨论了结构应力法的推导依据。人们已经开始使用壳单元模型进行有限元分析，以评估焊件的疲劳强度。通过对承载横向角焊缝进行疲劳强度评估，发现热点应力方法与结构应力方法以及测量方法都一致。但是，对于承载纵向角焊缝的载荷估算的热点应力相对于网格尺寸和元素类型显示出较大的变化，而为纵向角焊缝计算的结构应力相对独立于网格尺寸。根据结构应力估算了疲劳寿命，并使用了主S-N曲线。

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