【摘要】：為了關(guān)注焊接接頭的局部力學(xué)特征,引入彈性缺口應(yīng)力法分析復(fù)雜焊接結(jié)構(gòu)的疲勞強(qiáng)度。文章采用Neuber應(yīng)力平均概念衡量微觀約束效應(yīng),并探討了虛擬缺口圓的構(gòu)造理論和參數(shù)選取;提出在缺口應(yīng)力的有限元分析中,局部模型的邊界條件控制采用節(jié)點(diǎn)力法比位移法更能有效避免應(yīng)力集中和應(yīng)力分布不均。運(yùn)用缺口應(yīng)力法對(duì)設(shè)計(jì)階段的機(jī)車(chē)焊接構(gòu)架進(jìn)行了疲勞分析,通過(guò)建立構(gòu)架整體三維粘接模型和局部缺口模型,分析了焊接接頭的缺口應(yīng)力和累積損傷。本文為機(jī)車(chē)關(guān)鍵焊接部件的疲勞評(píng)估提供了一種新的方法。
[Abstract]:In order to pay attention to the local mechanical characteristics of welded joints, the elastic notch stress method was introduced to analyze the fatigue strength of complex welded structures. In this paper, the concept of Neuber stress averaging is used to measure the micro-constraint effect, and the construction theory and parameter selection of virtual notched circle are discussed. In the finite element analysis of notched stress, the nodal force method is more effective than the displacement method to avoid the stress concentration and uneven stress distribution in the boundary condition control of the local model. Fatigue analysis of locomotive welded frame in design stage was carried out by using notched stress method. The notched stress and cumulative damage of welded joint were analyzed by establishing three-dimensional bonding model and local notch model of the frame. This paper provides a new method for fatigue evaluation of key welding parts of locomotive.
【作者單位】： 西南交通大學(xué)牽引動(dòng)力國(guó)家重點(diǎn)實(shí)驗(yàn)室;南車(chē)株洲電力機(jī)車(chē)有限公司;
【基金】：國(guó)家自然科學(xué)基金(51205324)
【分類(lèi)號(hào)】：U260.6;TG405

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