摘要
用宏观与微观相结合的方法研究焊接接头疲劳损伤演变规律 .认为焊接接头中疲劳裂纹扩展路径在一定尺度范围内具有分形特征 ,用分形几何学方法建立裂纹扩展模型 ,将断裂力学的概念运用到损伤力学演化规律研究中 ,给出分形有效应力强度的表达式以及损伤演化率方程 ,推导出损伤演变方程 。
Based on the macroscopic and microscopic mechanics method,the law of fatigue damage evolution process inside welded joint is looked at The propagation paths of fatigue crack show the fractal characteristico in a scale range inside the welded joint Using the fractal geometry,a crack propagation model is analyzed A formula of fractal effective stress intensity and an equation of damage evolution is established A new effective method is provided for describing the fatigue fracture surfaces characters of welded structure from micro level and macro fracture characteristics
关键词
焊接结构
疲劳损伤
分形模型
welded structure
fatigue damage
fractal model
