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首页> 外文期刊>Engineering Structures >Fatigue strength capacity of load-carrying fillet welds on ultra-high-strength steel plates subjected to out-of-plane bending
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Fatigue strength capacity of load-carrying fillet welds on ultra-high-strength steel plates subjected to out-of-plane bending

机译：超高强度钢板上承载圆角焊缝疲劳强度能力，经受外平面弯曲的钢板

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摘要

Weld root fatigue strength capacity is an important design criterion in load-carrying (LC) fillet welded joints subjected to cyclic loads. This paper elaborates on the weld root fatigue strength capacity of fillet welded LC joints made of ultra-high-strength steel (UHSS) and subjected to out-of-plane bending. Experimental fatigue tests are carried out using constant amplitude loading with an applied stress ratio of R = 0.1 with both pure axial, i.e. DOB = 0 (degree of bending, bending stress divided by total stress) and bending, i.e. DOB = 1.0, load conditions. The applicability of different approaches - nominal weld stress, effective notch stress concepts, and 2D linear elastic fracture mechanics (LEFM) - for the fatigue strength assessment of weld root capacity is evaluated. Furthermore, a parametric LEFM analysis is used to evaluate the effect of weld penetration on the root fatigue strength capacity in axial and bending loading. The results indicate that in the case of bending, nominal weld stress can be calculated using the linear stress distribution over the joint section and FAT36 as a reference curve. In the bending loading, for the joints failing from the weld toe, a mean fatigue strength of up to 185 MPa in the nominal stress system was achieved, indicating that the reference curve FAT63 is overly conservative. The ENS concept with FAT225 seemed to be slightly unconservative for assessing the root fatigue strength capacity. LEFM analyses revealed that in the case of increasing weld penetration and bending loading, weld root fatigue strength capacity seemed to correlate with the nominal weld stress calculated using effective weld throat thickness, while in axial loading, weld stress should be calculated using external throat thickness summed with penetration length.
机译：焊接根疲劳强度容量是负载载荷（LC）焊接接头的重要设计标准，其循环负载。本文详细说明了由超高强度钢（UHSS）制成的圆角焊接LC接头的焊接根疲劳强度，并进行外平面弯曲。使用恒定幅度负载进行实验疲劳试验，其施加应力比R = 0.1与纯轴向，即DOB = 0（弯曲程度，弯曲应力除以总应力）和弯曲，即DOB = 1.0，负载条件。评估了不同方法的适用性 - 标称焊接应力，有效的凹口应力概念和2D线性弹性骨折力学（铅值） - 用于焊接根部容量的疲劳强度评估。此外，参数液晶分析用于评估焊接渗透对轴向和弯曲负载的根疲劳强度的影响。结果表明，在弯曲的情况下，可以使用接合部分和FAT36上的线性应力分布来计算标称焊接应力作为参考曲线。在弯曲负载中，对于从焊接脚趾未发生的接头，实现了标称应力系统中最多185MPa的平均疲劳强度，表明参考曲线FAT63过于保守。 EAS概念与FAT225似乎有轻微的难以评估根疲劳强度的能力。甲夫分析显示，在焊接渗透和弯曲负荷增加的情况下，焊接根疲劳强度容量似乎与使用有效焊接喉部厚度计算的标称焊接应力相关，而在轴向加载中，应使用外部喉部厚度总结计算焊接应力渗透长度。

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