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Fatigue life prediction of joggle weld joint using virtual strain gauge and its validation through experiments

机译：通过实验使用虚拟应变仪的曲线焊接接头的疲劳寿命预测及其验证

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This paper highlights fatigue life prediction and interactions between weld design parameters and their effect on joggle weld joint using the virtual strain gauging and its validation through experimental testing. Based on the concept of linear elastic fracture mechanics, the effects of weld geometry, load conditions and the boundary constraints on the fatigue strength of joggle weld joint are investigated using the finite element analysis. Response surface methodology is used to evaluate the influences of three weld joint parameters: plate thickness (Pt), root gap (Rg) and load (Ld) on normal stress (St) and fatigue life (Lf). Main effect plot shows that the plate thickness and the load are important parameters affecting the normal strain and fatigue life, whereas root gap influences the fatigue life only up to 2 mm, but no influence on fatigue life is observed after 3 mm of root gap. Experimental results show that the presence of secondary bending affects the experimental values of fatigue life. Contour plot and regression equation are used to study the effects of weld joint parameters on normal stress and fatigue life.
机译：本文突出了焊接设计参数与焊接设计参数之间的相互作用及其通过实验测试使用虚拟应变计及其验证对慢焊缝的影响。基于线性弹性断裂力学的概念，使用有限元分析研究了焊接几何形状，负荷条件和边界约束对逐焊缝疲劳强度的影响。响应面方法用于评估三个焊接接头参数：板厚（Pt），根间隙（RG）和负载（LD）对正常应力（ST）和疲劳寿命（LF）的影响。主效应图表明，板厚和负荷是影响正常菌株和疲劳寿命的重要参数，而根间隙影响疲劳寿命仅高达2mm，但在3毫米根间隙后没有对疲劳寿命的影响。实验结果表明，二次弯曲的存在影响了疲劳寿命的实验值。轮廓图和回归方程用于研究焊接接头参数对正常应力和疲劳寿命的影响。

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