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首页> 外文期刊>Composite Structures >Increase of contact radius due to deflection in low velocity impact of composite laminates and prediction of delamination threshold load
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Increase of contact radius due to deflection in low velocity impact of composite laminates and prediction of delamination threshold load

机译：复合材料层合板在低速冲击中的挠度引起的接触半径的增加以及分层阈值载荷的预测

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An analytical method is proposed to calculate the increase of contact radius due to the deflection of the laminate subjected to low velocity impact with respect to that calculated with Hertz contact law. The method is validated with finite element method (FEM). The model of delamination threshold load (DTL) is improved based on the corrected contact radius. The low velocity impacts were conducted on a composite wing box, and the DTLs of skins were measured under the impacts of three indenters variant in diameter. The linear model was fist employed to prediction the DTLs, the maximum error of which reaches 27%. The increase of contact radius was calculated for each impact, which is ranging from 41% to 44%. The DTL were then recalculated based on the revised contact radius, and the prediction errors are lower than 6.5%. The presented method is less time consuming in comparison to the FEM and is applicable to predict the DTLs of a laminate family when the interlaminar shear strength is given. (C) 2016 Elsevier Ltd. All rights reserved.
机译：提出了一种分析方法来计算相对于赫兹接触定律所计算的接触速度的增加，该接触半径是由于层压板在低速冲击下的挠度而引起的。该方法已通过有限元方法（FEM）进行了验证。基于校正的接触半径，改进了分层阈值负载（DTL）的模型。在复合机翼盒上进行低速冲击，并在三个直径变化的压头的冲击下测量蒙皮的DTL。首先采用线性模型预测DTL，其最大误差达到27％。计算出每种冲击的接触半径的增加，范围从41％到44％。然后根据修订后的接触半径重新计算DTL，并且预测误差低于6.5％。与有限元法相比，该方法耗时少，适用于在给出层间剪切强度时预测层压板系列的DTL。 （C）2016 Elsevier Ltd.保留所有权利。

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