Reserce on the Well Three-Dimensional Cracks Stress Intensity Factor

With an aim at the solution multiplicity of the well three-dimensional cracks sress intensity factor under the load,the solution method of three-dimensional cracks stress intensity factor based on weight function theory is studied.By comparing the result curve with Newman result curve,the results are found to be well fitted,whereby indicating that weight function is considerably accurate and simple in calculating stress intensity factor.The stress tri-axicity fracture criterion,elastic fracture mechanics and fluid mechanics theory are comprehensively adopted to analyze the problems of the initial growth of the well three-dimentional cracks and three-dimentional extension.Also,this paper analyzes the extending rules of crack length,crack altitude and crack width with the variation in constructing time via the calculation examples.The results indicate that this method and the computation model are reliable and suitable.