基于改进层间剪切强度准则的层压板冲击分层阈值力预测

doi:10.7527/S1000-6893.2013.0512

Abstract

Abstract:

The contact radius of thin plates subjected to impacts with great deflection may be larger than that which is directly calculated with the Hertzian contact law. Two methods are proposed to calculate the contact radius with consideration of the deflection of a thin plate. The preliminary contact radius is calculated first based on the Hertzian contact law. The modified contact radius is then obtained by solving the simultaneous equations of a composite laminate's deflection and the geometry of the impactor. The modification of the contact radius is verified with finite element simulations. The modified contact radius is adopted to set up a new delamination threshold load (DTL) criterion based on the interlaminar shear strength. An approach of DTL prediction for the impact on composite laminates of different thicknesses by different tup diameters using a little test data is proposed based on this criterion. The proposed method is applied to predict the DTL of a low velocity impact on the skin of a composite wing box and it yields more accurate results.

Key words: delamination threshold load, composite laminate, interlaminar shear strength, contact radius, delamination prediction, finite element method

CLC Number:

V258

GAO Shangjun, YU Zhefeng, WANG Hai. Prediction of Delamination Threshold Load for Impact on Composite Laminate Based on Modified Interlaminar Shear Strength Criterion[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(5): 1329-1335.

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Prediction of Delamination Threshold Load for Impact on Composite Laminate Based on Modified Interlaminar Shear Strength Criterion

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