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摘要: 利用高速空气炮进行了冰雹撞击复合材料T型接头的实验，研究了不同撞击速度下结构的损伤情况。同时，采用光滑质点流体动力学方法与黏聚区模型相结合的方法，对冰雹撞击复合材料T型接头进行了数值模拟。通过与实验结果的对比，验证了数值模拟模型的有效性。在此基础上，利用数值模型研究了影响复合材料T型接头冰雹撞击损伤的各种因素。计算结果表明：冰雹撞击对复合材料T型接头造成的损伤主要为分层损伤；冰雹的撞击速度、尺寸、入射角等，都对T型接头的损伤程度有很大影响；T型接头的分层面积与冰雹的撞击能量之间呈近似线性关系，分层面积随着撞击能量的增大而增大；冰雹的入射角越大，分层面积与撞击力峰值也越大。Abstract: This paper was dedicated to developing a numerical model which could predict the delamination of composite T-joint structures caused by high velocity impact of hailstone. Experiments of hailstone impact and subsequent numerical analyses were performed to study the performance of composite T-joints under hailstone impact. The smooth particle hydrodynamic (SPH) approach and the cohesive zone model (CZM) were both employed in numerical simulations to predict the delamination of composite T-joints, and the numerical results show good agreement with that of experiments such as delamination size and displacement of the composite T-joints. In addition, based on the numerical simulation, the influence of calculation parameters on the damages of the T-joints were investigated, and the results show that the velocity, the dimension and the impact angle of hailstone had great influence on the damage of the composite T-joint structures. The numerical simulation show an approximately linear relationship between the impact energy and the delamination size. The peak force of impact and the delamination size increase with the increase of the impact angle.
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Key words:
- solid mechanics /
- delamination damage /
- cohesive zone model /
- composite T-joint /
- hailstone /
- high velocity impact
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图 9 试验件筋条顶点处z方向位移曲线
Figure 9. Displacement in z direction at the top of fillet of the specimen
图 10 冰雹接头在x方向的分层长度与撞击能量关系
Figure 10. Delamination length in x direction versus impact energy
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