CAJ | 학술논문

为了关注焊接接头的局部力学特征，引入弹性缺口应力法分析复杂焊接结构的疲劳强度。文章采用Neuber应力平均概念衡量微观约束效应，并探讨了虚拟缺口圆的构造理论和参数选取；提出在缺口应力的有限元分析中，局部模型的边界条件控制采用节点力法比位移法更能有效避免应力集中和应力分布不均。运用缺口应力法对设计阶段的机车焊接构架进行了疲劳分析，通过建立构架整体三维粘接模型和局部缺口模型，分析了焊接接头的缺口应力和累积损伤。本文为机车关键焊接部件的疲劳评估提供了一种新的方法。
위료관주한접접두적국부역학특정，인입탄성결구응역법분석복잡한접결구적피로강도。문장채용Neuber응력평균개념형량미관약속효응，병탐토료허의결구원적구조이론화삼수선취；제출재결구응력적유한원분석중，국부모형적변계조건공제채용절점역법비위이법경능유효피면응력집중화응력분포불균。운용결구응역법대설계계단적궤차한접구가진행료피로분석，통과건립구가정체삼유점접모형화국부결구모형，분석료한접접두적결구응력화루적손상。본문위궤차관건한접부건적피로평고제공료일충신적방법。
In order to study the local mechanical properties of welded j oints,the elastic notch stress method is used to analyze the fatigue strength of a complex welded structure.The paper assesses the micro-structural notch support effect with the Neuber’s stress averaging approach,and discusses the modeling theory and pa-rameter selection of the fictitious notch rounding.The paper presents that,in the analysis of notch stress with FEM,when it comes to controlling the boundary conditions of the local model,the use of the nodal force can better avoid stress concentration and uneven stress distribution than the displacement method.Fatigue analysis by notch stress method is performed on the locomotive welded frame in the design stage.Notch stress and cu-mulative damage for welding joints are calculated through the establishment of the 3D overall model and sub-model.This paper provides a new method for the fatigue assessment of key welded structures of locomotives.