单纤维压出实验是一种细观实验方法,用于测量复合材料的界面强度。本文采用子域法处理多域问题,利用轴对称边界元程序,对单纤维压出实验模型的应力传递进行了分析,并与常用的剪切滞后理论的分析结果进行了比较,发现在大部分纤维埋置区域,两种分析吻合很好,在纤维与基体的界面端部,边界元的分析结果显示界面应力在该区域有奇异现象,而剪滞理论则无法反映应力奇异现象。应力奇异现象的存在使得我们对该实验的界面强度判据需要重新进行研究。 Single fiber extrusion test is a mesoscopic experiment method for measuring the interfacial strength of composite materials. In this paper, the subdomain method is used to solve the multi-domain problem. By using the axisymmetric boundary element program, the stress transfer of the single-fiber extrusion model is analyzed and compared with the commonly used shear lag theory analysis. The analysis of the boundary element shows that the interfacial stress has a singularity in this area, while the shear lag theory can not reflect the stress singularity at the interface between fiber and matrix. The existence of stress singularity makes us need to re-study the interface strength criterion of this experiment.