高强度螺栓应力腐蚀断裂过程的建模与仿真

Modeling and Simulating of Stress Corrosion Cracking in High Strength Bolt

为研究某产品轴承基座高强度联结螺栓使用中发生的延迟断裂失效问题,应用断裂力学的理论和方法建立了相关的数学模型,以描述和推测其断裂失效的真正原因,并在此模型的基础上应用Matlab/Simulink软件进行了仿真。仿真结果表明:控制螺栓内部的残余内应力和螺栓的初始裂纹长度对于提高螺栓抗应力腐蚀能力有非常重要的影响,但螺栓内部的残余内应力对于应力腐蚀裂纹扩展寿命的影响更为显著。

To the problem of the delay rupture of the bolts from the bearing base in cover system, This paper uses the theories and methods of fracture mechanics to build mathematical models of the stress corrosion cracking for describing the real reasons of its rupturing, and then uses Matlab/Simulink to simulate those mathematical methods. Results show that residual stress and crack length in the bolt have an important effect for improving the ability of anti-stress corrosion cracking, but the effect of residual stress in the bolt on tF is more notable.