形状记忆合金-玻璃纤维/环氧树脂复合材料在振动边界条件下的低速冲击数值模拟

Numerical analysis of the low-velocity impact resistance of shape memory alloy-glass fiber/epoxy resin composites under vibrating boundary condition

  • 摘要: 采用有限元方法(FEM)研究了振动边界条件对形状记忆合金(SMA)-玻璃纤维/环氧树脂复合材料的抗低速冲击性能的影响。在数值模拟过程中,将改进的三维Hashin失效准则和Brinson模型分别应用于玻璃纤维/环氧树脂复合材料层合板和SMA,以表征其本构关系。首先通过与固定边界条件下的SMA-玻璃纤维/环氧树脂复合材料板低速冲击实验进行比较,验证了数值模拟过程中所用模型及材料参数的准确性。其次,在模拟过程中,应用了包含不同振幅的一系列振动边界条件,对其进行模拟,揭示了振动边界条件对其抗低速冲击性能的影响。数值模拟结果表明,在大振幅条件下,无SMA复合材料的抗冲击性能比小振幅条件下弱;在相同振动边界条件下,SMA-玻璃纤维/环氧树脂复合材料与无SMA复合材料相比,其抗低速冲击性能提高。

     

    Abstract: Effect of the vibrating boundary condition on resistance of shape memory alloy (SMA)-glass fiber/epoxy resin composites subjected to low-velocity impact was investigated by finite element method (FEM). Hashin's failure criterion and Brinson's model were implemented into FEM to characterize the constitutive relations of glass fiber/epoxy resin laminates and SMA, respectively. Fixed boundary condition was maintained in simulation to verify the accuracy of material parameters and procedures by comparing with impact experiment of SMA-glass fiber/epoxy resin composite. A series of vibrating boundaries with amplitudes were applied during the simulation process to reveal the effect on impact resistances. The simulation results indicate that the impact resistance of the composite without SMA under large amplitude is lower than that under small amplitude; as for SMA-glass fiber/epoxy resin composite, the impact resistance is higher.

     

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