基于子模型法的带有表面裂纹钢丝应力强度因子研究

发布时间：2018-05-31 23:32

本文选题：钢丝 + 子模型法　；参考：《计算力学学报》2017年02期

【摘要】：钢丝裂纹应力强度因子是进行钢丝疲劳断裂寿命评估、疲劳裂纹扩展分析和钢丝断裂强度评估等工作的重要参数。本文首先介绍了裂纹扩展分析软件FRANC3D,然后基于子模型法模拟研究了拉伸荷载作用下带有表面裂纹钢丝的应力强度因子,裂纹种类包括直线形裂纹和半圆形裂纹,最后拟合得到拉伸荷载作用下带表面裂纹钢丝的应力强度因子形状修正系数表达式,分析了利用该公式进行承载力评估时产生误差的原因。研究结果表明,利用子模型模拟分析拉伸荷载作用下带有表面裂纹的钢丝应力强度因子时计算精度高,计算速度快,对计算机硬件要求低;利用该方法得到的钢丝裂纹应力强度因子,在进行索承式桥梁吊索安全性能评估时,评估结果更精确。
[Abstract]:Stress intensity factor of steel wire crack is an important parameter to evaluate fatigue fracture life of steel wire, fatigue crack propagation analysis and fracture strength evaluation of steel wire. In this paper, the crack growth analysis software FRANC3D is introduced, and then the stress intensity factor of steel wire with surface crack under tensile load is simulated based on sub-model method. The crack types include linear crack and semicircular crack. Finally, the expression of shape correction coefficient of stress intensity factor for steel wire with surface crack under tensile load is obtained by fitting. The reason of error when using this formula to evaluate the bearing capacity is analyzed. The results show that the calculation accuracy of stress intensity factor of steel wire with surface crack under tensile load is high, the calculation speed is fast, and the requirement of computer hardware is low. Using the stress intensity factor of steel wire crack obtained by this method, the evaluation results are more accurate when evaluating the safety performance of cable bridge slings.
【作者单位】：宿迁学院建筑工程系;东南大学混凝土及预应力混凝土结构教育部重点试验室;
【基金】：国家自然科学基金(51078080) 江苏省自然科学基金(BK2012562) 江苏省高校自然科学研究(10KJB58005) 宿迁市交通运输科学研究(KY2014-1)资助项目
【分类号】：U441.4

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