玻璃纤维单丝拔出实验及其有限元模拟

Simulation and Analysis of Single Fibreglass Pull-out Test with FEM

在细观有限元模型基础上,利用ANSYS有限元程序对不同埋入长度的玻璃纤维/水泥复合材料的纤维拔出行为进行了数值模拟,结合玻璃纤维/水泥复合材料的纤维拔出实验数据验证数值模拟的合理性,并讨论接枝对复合材料拔出行为的影响。结果表明,环氧树脂接枝对复合材料的界面平均剪切强度、破坏模式均有较大影响,与无接枝情况相比,两种接枝中环氧树脂接枝的复合材料界面的平均剪切强度提高了92%;破坏模式与接枝有关,界面破坏导致无接枝玻璃纤维拔出,水泥破坏导致环氧树脂接枝玻璃纤维拔出。此外,还通过有限元分析结果讨论了破坏模式特征及其演化规律,研究结果有助于分析该类复合材料的破坏机理。

Based on the single fiber representative volume element of fiber reinforced composites, the single fibre pull-out test of Fiberglass/Cement composites were numerically simulated by using finite element eode ANSYS and considering different embedment length. According to experimental data of Fiberglass/Cement composites, the numeri-eal simulation is reasonable. The effect of graft on the single fibre pull-out of the composite was discussed. The results show that the epoxy resin graft has a great effect on the interfacial shear strength and failure mode. Compared with no graft, the interfacial shear strength results indicated that the epoxy resin graft reinforced composites improved by 92%. Failure mode has a relationship with the graft. The interfacial failure modes lead to Fiberglass of non-grafted pull out, the cement failure modes lead to Fiberglass of epoxy resin graft pull out. Moreover, based on the numerical results, the failure mode and its evolution features were also discussed, which are useful to study the failure mechanism of fiber reinforced composites.