基于断裂参量K因子的焊接接头等承载设计系统
Equal load carrying capacity design system of joint based on stress intensity factor
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摘要: 以高效准确的获得含不同缺陷接头满足等承载时的形状参数为目标,结合断裂力学理论及专家系统思想,开发了基于断裂参量K因子的焊接接头等承载设计系统.结果表明,该系统不但可以高效准确的给出焊缝和母材都含缺陷以及焊缝含缺陷母材无缺陷的接头满足等承载时的形状参数,显著提高了等承载接头的设计效率及准确性,推广了等承载接头设计思想.而且能够计算含缺陷接头承受静载时的应力强度因子、J积分、裂纹尖端张开位移、临界载荷和临界裂纹尺寸以及含缺陷接头承受疲劳载荷时的许用载荷幅值和裂纹扩展速率等相关参量,为准确指导含缺陷接头形状设计及安全性评估提供了基础.Abstract: In order to efficiently obtain the equal load carrying capacity (ELCC) joint shape parameters of joint with different defects,an ELCC design system of joint based on stress intensity factor was developed by combining fracture mechanics theory and expert system. The results show that ELCC joint shape parameters of joint with different defects could be efficiently obtained using this system. The efficiency and accuracy of ELCC joint design could be obviously improved,and the ELCC design method could also be extended. Stress intensity factor,J-integral, crack tip opening displacement,critical stress and critical crack length of defected joint under static load could be obtained with this system. The allowable load amplitude,crack growth rate and other corresponding parameters of defected joint under fatigue load could also be obtained with this system. This system can guide the joint shape design and safety assessment.