Mohsin Muhammad Ameerul Atrash, Iannucci Lorenzo, Greenhalgh Emile S
Department of Aeronautics, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
Materials (Basel). 2021 Mar 27;14(7):1653. doi: 10.3390/ma14071653.
A dynamic tensile experiment was performed on a rectangular specimen of a non-crimp fabric (NCF) thermoplastic composite T700 carbon/polyamide 6.6 specimens using a split Hopkinson pressure (Kolsky) bar (SHPB). The experiment successfully provided useful information on the strain-rate sensitivity of the NCF carbon/thermoplastic material system. The average tensile strength at three varying strain rates: 700, 1400, and 2100/s was calculated and compared to the tensile strength measured from a standardized (quasi-static) procedure. The increase in tensile strength was found to be 3.5, 24.2, and 45.1% at 700, 1400, and 2100/s strain rate, respectively. The experimental findings were used as input parameters for the numerical model developed using a commercial finite element (FE) explicit solver LS-DYNA. The dynamic FE model was validated against experimental gathering and used to predict the composite system's behavior in various engineering applications under high strain-rate loading conditions. The SHPB tension test detailed in this study provided the enhanced understanding of the T700/polyamide 6.6 composite material's behavior under different strain rates and allowed for the prediction of the material's behavior under real-world, dynamic loading conditions, such as low-velocity and high-velocity impact.
使用分离式霍普金森压杆（科尔斯基杆，SHPB）对非卷曲织物（NCF）热塑性复合材料T700碳纤维/聚酰胺6.6的矩形试样进行了动态拉伸试验。该实验成功地提供了关于NCF碳/热塑性材料系统应变率敏感性的有用信息。计算了700、1400和2100/s三种不同应变率下的平均拉伸强度，并与通过标准化（准静态）程序测得的拉伸强度进行了比较。结果发现，在700、1400和2100/s应变率下，拉伸强度分别提高了3.5%、24.2%和45.1%。实验结果被用作使用商业有限元（FE）显式求解器LS-DYNA开发的数值模型的输入参数。动态有限元模型通过实验数据进行了验证，并用于预测复合材料系统在高应变率加载条件下在各种工程应用中的行为。本研究中详细介绍的SHPB拉伸试验增进了对T700/聚酰胺6.6复合材料在不同应变率下行为的理解，并能够预测该材料在实际动态加载条件下的行为，如低速和高速冲击。
