测定应力强度因子的守恒积分┐光弹性法

Conservative Integral Photoelastic Method for Determination of Stress Intensity Factors in Fractures Mechanics

提出了测定断裂力学中应力强度因子的守恒积分－光测弹性力学方法，推导了守恒积分中位移梯度的应力分量表达式，从而可由应力光图所提供的信息计算守恒积分，并确定应力强度因子．本方法克服了单参数法与双参数法固有缺点．由此所得结果与由边界配置法所得结果非常一致．

A conservation integral photoelasticity method is provided for determination of stress intensity factors in fracture mechanics.The displacement gradients in the expression of the concervative integral are expressed in terms of stress components.Then,the conservative integral can be evaluated by the interference fringe patterns in photoelastic experiments.Finally,the stress intensity factor will be determined by the J K Ⅰ relation in fracture mechanics.Due to the path independent property of conservative integral,the difficuties encountered in the methods of mono parameter,bi parameter and multi parameter can be overcomed by this one.The agreements between the results given by this method and those obtained from the boundary collocation method are satisfactory.