摘要
针对评估桥式起重机金属结构疲劳寿命的问题,以桥式起重机受力分析为基础,借助ANSYS软件的相互作用积分法,结合恒幅载荷下裂纹扩展寿命的理论,对箱型梁腹板跨中部位的腹板——下翼缘板处的裂纹进行分析,拟合出应力循环次数与裂纹尺寸的关系,得出恒幅载荷下桥式起重机的疲劳裂纹扩展寿命。同时,归纳桥式起重机疲劳寿命计算的影响因素及其试验推荐值。结果表明,循环次数与裂纹尺寸之间的关系符合疲劳裂纹扩展的客观规律。
Fatigue problem is one of the difficult evaluation problems of bridge crane steel structure. The life of crack on web-bottom flange of box beam was analyzed, which was based on the force bearing analysis on the bridge crane, with the help of the interaction integral method of ANSYS software and the theory of crack propagation life under constant amplitude loading. The relationship is fit from the stress cycles and crack, and the fatigue crack propagation life of bridge crane under constant amplitude loading was obtained. At the same time, the influent fac- tors of bridge crane fatigue life calculation were summarized, and the value of the experience was recommended. It shows that the relationship between cycles and crack size accords with the objective law of fatigue crack propaga- tion.
出处
《太原科技大学学报》
2016年第5期395-399,共5页
Journal of Taiyuan University of Science and Technology
基金
国家自然科学基金资助项目(51275329)
太原科技大学博士启动基金(20122034)
