人工蚀坑对复杂应力场下钢桥焊接接头疲劳寿命的影响
发布时间：2018-08-19 09:32
【摘要】：为研究人工蚀坑对复杂应力场下钢桥焊接接头疲劳寿命的影响规律,以45°倾角全熔透承载角焊缝十字形焊接接头为研究对象,构造两种不同深度的人工半球形蚀坑模拟实际腐蚀情况;对不同蚀坑深度下的焊接接头进行轴向拉伸疲劳试验,建立疲劳缺口系数与蚀坑深度的关系;提出一种考虑蚀坑深度和应力幅的腐蚀疲劳寿命影响系数定义方式。结果表明:在相同蚀坑半径下,随着蚀坑深度的增加,疲劳缺口系数及其变化率均增大,疲劳缺口敏感系数为0.389;不同蚀坑深度和应力幅下焊接接头的疲劳寿命不同,蚀坑深度对疲劳寿命的影响更灵敏;基于腐蚀疲劳寿命影响系数得到的疲劳寿命预测值与试验值最大相对误差为-21.5%,表明两者吻合较好,因此环境腐蚀下应综合考虑蚀坑深度和应力幅对焊接接头疲劳寿命降低程度的影响。
[Abstract]:In order to study the effect of artificial pit on fatigue life of welded joint of steel bridge under complex stress field, 45 掳inclination angle full penetration bearing angle weld cross welded joint is taken as the object of study. Two kinds of artificial hemispherical pits with different depths were constructed to simulate the actual corrosion conditions, and the axial tensile fatigue tests of welded joints with different depth of corrosion pits were carried out to establish the relationship between the fatigue notch coefficient and the depth of the pits. A method of defining the influence coefficient of corrosion fatigue life considering the depth and stress amplitude of corrosion pit is proposed. The results show that with the increase of pit depth, the fatigue notch coefficient and its change rate increase, and the fatigue notch sensitivity coefficient is 0.389, and the fatigue life of welded joint is different with different pit depth and stress amplitude. The influence of pit depth on fatigue life is more sensitive, and the maximum relative error between the predicted value of fatigue life and the test value is -21.5, which shows that the two parameters are in good agreement with each other. Therefore, the effect of pit depth and stress amplitude on fatigue life of welded joints should be considered.
【作者单位】： 宁波大学建筑工程与环境学院;西南交通大学土木工程学院;
【基金】：国家自然科学基金(51378430,51378431) 浙江省自然科学基金(LQ17E080005)
【分类号】：U441.4;U445.583
本文编号：2191261
[Abstract]:In order to study the effect of artificial pit on fatigue life of welded joint of steel bridge under complex stress field, 45 掳inclination angle full penetration bearing angle weld cross welded joint is taken as the object of study. Two kinds of artificial hemispherical pits with different depths were constructed to simulate the actual corrosion conditions, and the axial tensile fatigue tests of welded joints with different depth of corrosion pits were carried out to establish the relationship between the fatigue notch coefficient and the depth of the pits. A method of defining the influence coefficient of corrosion fatigue life considering the depth and stress amplitude of corrosion pit is proposed. The results show that with the increase of pit depth, the fatigue notch coefficient and its change rate increase, and the fatigue notch sensitivity coefficient is 0.389, and the fatigue life of welded joint is different with different pit depth and stress amplitude. The influence of pit depth on fatigue life is more sensitive, and the maximum relative error between the predicted value of fatigue life and the test value is -21.5, which shows that the two parameters are in good agreement with each other. Therefore, the effect of pit depth and stress amplitude on fatigue life of welded joints should be considered.
【作者单位】： 宁波大学建筑工程与环境学院;西南交通大学土木工程学院;
【基金】：国家自然科学基金(51378430,51378431) 浙江省自然科学基金(LQ17E080005)
【分类号】：U441.4;U445.583
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