碳纤维增强复合材料桥梁弯曲破坏过程有限元模拟

FEM SIMULATION OF FAILURE PROCESS UNDER BENDING TEST FOR CARBON FIBER REINFORCED COMPOSITES BRIDGE

利用MTS-810型万能强力机测试复合材料桥梁的弯曲性能,得到复合材料桥梁载荷-挠度曲线和弯曲破坏形态。基于复合材料桥梁的真实结构,建立连续实体壳单元桥梁模型,运用商用有限元软件Abaqus/Explicit计算桥梁的弯曲破坏过程。计算得到的载荷-挠度曲线与试验具有较好的一致性;破坏位置均发生在支撑辊的位置;复合材料桥梁的破坏模式主要表现为纤维断裂、基体开裂、分层破坏以及腹板屈曲失稳。研究结果表明,有限元法用于复合材料桥梁的性能预测和优化设计是有效的。

It is important to know the bending failure mechanisms for designing the composite structures in engineering field.The bending damage mechanisms and failure process of carbon fiber reinforced composites bridge are reported.The bending properties were tested on fiber reinforce composites bridge by MTS-810 universal testing machine.The load-deflection curve and failure modes were obtained.Based on the real structure of composites bridge,a continuum shell element model was established.Composites bridge was incorporated with a finite element code Abaqus/Explicit to simulate the bending failure process.Load-deflection curve obtained from the finite element method and the test result has good consistency.Failure was occurred in the position of the supporting rollers.Fiber breakage,matrix cracking,delamination and plate buckling were the main failure modes of the composites bridge.The result showed that the application of FEM in predicting the mechnical properties and optimization design of composites bridge is effective.