基于虚裂纹模型的概念 ,导出了无限大板中心直裂纹在远场均匀拉应力作用下双参数模型的应力函数和位移函数 ,其解由线弹性断裂力学解、Dudale的解答和加权积分法导出的虚裂纹模型解所构成 ,最后给出了虚裂纹长度与应力强度因子及张开位移的关系 Based on the concept of virtual crack model, the stress function and displacement function of the two-parameter model under the uniform tensile stress in the infinite field are derived. The solution is derived from the solution of linear elastic fracture mechanics, Dudale’s solution and weighted integral method Finally, the relationship between the length of the virtual crack and the stress intensity factor and the open displacement is given