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Impact response and damage in laminated composite cylindrical shells

机译：层压复合圆柱壳的冲击响应和损伤

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摘要

Impact response of a laminated composite cylindrical shell is determined both by the classical Fourier series and the finite element methods. Impact response determined by the finite element method also includes a prediction of the impact-induced damage deploying the semi-empirical damage prediction model of Choi-Chang. In the analytical method, the solution is obtained by means of an alternative numerical procedure incorporating the non-linear Hertz's contact law which enables consideration of local indentation produced by the indentor on the impacted surface, instead of the Laplace Transforms technique used in an earlier work. The above procedure is also extended to the problem of impact on a cylindrical shell panel. The analytical procedure also provided information such as the natural frequencies of vibration of the impacted shell which helped in selecting appropriate mesh and time step sizes for the finite element method. A parametric study was carried out by the finite element method to determine the effect of varying the controlling parameters such as impactor mass, its approach velocity, curvature of the shell, on both the impact response and on the impact-induced damage. A reduction of the stiffnesses of the failed laminas on the impact response concurrently as the solution proceeded has also been incorporated.
机译：层压复合圆柱壳的冲击响应是通过经典的傅里叶级数和有限元方法确定的。通过有限元方法确定的冲击响应还包括使用Choi-Chang的半经验损伤预测模型对冲击引起的损伤的预测。在分析方法中，解决方案是通过包含非线性赫兹接触定律的替代数值程序获得的，该定律可以考虑压头在受冲击表面上产生的局部压痕，而不是先前工作中使用的拉普拉斯变换技术。 。上述过程还扩展到了对圆柱形壳体面板的冲击问题。分析程序还提供了信息，例如，受冲击壳体的固有振动频率，这些信息有助于为有限元方法选择合适的网格和时间步长。通过有限元方法进行了参数研究，以确定改变控制参数（如冲击器质量，其进近速度，壳体曲率）对冲击响应和冲击诱发损伤的影响。随着解决方案的进行，同时降低了失效薄片对冲击响应的刚度。

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