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An efficient approach to determine compression after impact strength of quasi-isotropic composite laminates

机译：确定准各向同性复合材料层压板冲击强度后压缩的有效方法

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摘要

An approach to obtain accurate estimates of the compression after impact strength of quasi-isotropic composite laminates is presented. The method makes use of the damage size and type calculations obtained previously, and models the damaged region as an area of concentric ellipses each with different stiffness and strength properties. A Rayleigh-Ritz approach is used to calculate the stresses in each of the inclusions representing the damage. Failure is predicted as material failure when local stresses exceed the load carrying capability of the elliptical inclusion in question. Once a portion of the damaged region fails, its load is redistributed to adjacent elliptical inclusions or sub-laminates. A progressive failure analysis follows until the entire laminate fails. This process requires an accurate prediction of the undamaged failure stress. Comparison with test results shows the analytical predictions to be in good agreement for the majority of cases.
机译：提出了一种在准各向同性复合材料层压板的冲击强度后获得压缩强度准确估计值的方法。该方法利用先前获得的损伤大小和类型计算，并将损伤区域建模为同心椭圆形区域，每个椭圆形具有不同的刚度和强度属性。 Rayleigh-Ritz方法用于计算代表损伤的每个夹杂物中的应力。当局部应力超过所讨论的椭圆形夹杂物的承载能力时，将其预测为材料破坏。一旦损坏区域的一部分失效，其载荷就会重新分配给相邻的椭圆形夹杂物或子叠层。随后进行渐进式失效分析，直到整个层压板失效为止。此过程需要准确预测未损坏的破坏应力。与测试结果的比较表明，在大多数情况下，分析预测都非常吻合。

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