利用光学显微镜原位研究在Ⅰ型动态加载下玻璃布增强ＰＣ复合材料层板的分层断裂过程及其微观机理．结果表明，分层损伤微裂纹易萌生在平行于裂纹扩展方向的纱线束和交织面内．在层板边缘，主裂纹可沿经纱的方向穿过经纱和纬纱的交织面向前扩展，造成织物分隔．随裂纹张开位移的增大，纬纱才回到原织物平面内． The optical microscope was used to study the delamination and fracture mechanism of PC composite laminates under the dynamic loading of type Ⅰ and its microscopic mechanism. The results show that the delaminated micro-cracks are easy to occur in the bundles of yarn and interlacing in parallel with the crack propagation direction. At the edge of the laminates, the main crack can propagate forward in the warp direction across the interlacing face of the warp and weft, causing the fabric to separate. As the crack open displacement increases, weft yarn back to the original fabric plane.