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以聚乙烯(PE)材料为基体，应用玻璃纤维随机或定向分布，增加材料的强度、刚度和断裂韧性，是发展高压大口径复合材料天然气管道的需要。本文基于PFRAC程序的动态断裂分析能力[1]，增加了各向异性材料的本构条件，发展了对纤维增强复合材料未开裂和开裂管道的计算功能。由力学性能的试验结果，提供了材料的本构关系，对未开裂和开裂的管道进行了计算分析。结果表明，PE管道经纤维增强之后，与纯PE材料的管道相比，其环向位移下降到53%(纤维随机分布)~5%(纤维沿管道轴向80度分布)；裂纹驱动力相应下降到50%~17%，充分反映了纤维对PE材料的增强和增韧效果。
Taking polyethylene (PE) as matrix, the application of random or directional distribution of glass fibers to increase the strength, stiffness and fracture toughness of the materials is the need to develop high pressure and large diameter composite natural gas pipelines. Based on the dynamic fracture analysis capabilities of the PFRAC program [1], this paper increases the constitutive conditions for anisotropic materials and develops computational functions for the uncracked and cracked pipes of fiber reinforced composites. The test results of mechanical properties provide the constitutive relationship of the materials, and the uncracked and cracked pipes are calculated and analyzed. The results show that the circumferential displacement of PE pipe decreases to 53% (random distribution of fibers) to 5% (fibers are distributed 80 degrees along the pipe axis) compared with that of pure PE pipe after fiber reinforcement. The crack driving force corresponds to Down to 50% to 17%, fully reflects the fiber reinforced PE material and toughening effect.