| 摘要: |
| 在双悬臂梁试验测得的力位移曲线基础上，现有的大部分理论将断裂韧性取为常数来预测层间开裂行为，导致仿真结果与试验测试存在较大偏差。为了完善现有的复合材料层合板脱层理论，采用经典梁理论和断裂力学理论，分析了纤维增强复合材料层合板的双悬臂测试。此外，考虑脱层过程中纤维桥接效应，利用双线性内聚力模型开展相应的数值模拟，数值结果与已有的理论预测以及试验测试进行了对比。结果表明，纤维桥接使得断裂韧性增加，模拟得到的力位移曲线与试验测试结果非常吻合，因而在模拟中考虑纤维桥接效应对临界能量释放率进行修正可以更准确地预测裂纹起始和扩展过程。 |
| 关键词: 双悬臂梁测试 纤维桥接 内聚力模型 R曲线 |
| DOI： |
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| 基金项目:国家自然科学基金（12272310）；国家专项基金(MJZ5-2N22) |
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| Simulation Study on Delamination Evolution of Composite Double Cantilever Beams Considering Fiber Bridging Effect |
| HUANG Chenguang,XIE Qian,CHEN Long,KONG Fanjie,KONG Jie |
| (Northwestern Polytechnical University School of Mechanics and Civil Architecture, Xi'an 710072, China;Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China;Northwestern Polytechnical University School of Chemistry and Chemical Engineering, Xi'an 710072, China) |
| Abstract: |
| Based on the force-displacement curve measured for double cantilever beam, the fracture toughness was usually regarded as a constant to predict the interface cracking behavior, resulting in significant deviations between simulation results and experimental observations. For improving the delamination theory of composite laminates, in this paper, we adopt classical beam and fracture theories to analyze the double cantilever testing of fiber-reinforced composite laminates. Moreover, by taking into account fiber bridging effect during delamination, the numerical simulations are carried out based on the bilinear cohesive zone model. The numerical results are compared with the existing theoretical predictions and experimental tests. The results indicate that fiber bridging results in an increase in fracture toughness, and the force-displacement curve obtained by simulation is highly consistent with the experimental results. Thus, the modification of the critical energy release rate with consideration of the fiber bridging effect can predict the crack initiation and propagation process more accurately. |
| Key words: Double cantilever beam test Fiber bridging Cohesive model R curve |