Effect of matrix damage on compressive strength in the fiber direction for laminated composites

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• 作者：G. Eyer^a ; O. Montagnier^a ; ^b ; ^{olivier.montagnier@defense.gouv.fr} ; C. Hochard^a ; J.-P. Charles^a
• 关键词：A. Polymer-matrix composites (PMCs) ; B. Strength ; C. Damage mechanics ; D. Mechanical testing
• 刊名：Composites Part A: Applied Science and Manufacturing
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：94
• 期：Complete
• 页码：86-92
• 全文大小：1671 K
• 卷排序：94

文摘

An original experimental method is proposed to characterize the influence of matrix damage on the compressive strength of laminated composites in the fiber direction using tubes. These composite tubes have a dumbbell-shaped geometry so that rupture occurs in the specimen center without stress concentration. They can be constituted of unidirectional or woven plies aligned with the axial direction. First, a torsional cyclic load is applied in order to damage the matrix. This damage is measured at the tube scale via the reduction in shear modulus. Second, a compressive load is applied up to failure for various damage levels.The method is applied to a woven carbon/epoxy material. Results show that the matrix damage affects significantly the compressive strength in the fiber direction. It is yet observed that longitudinal stiffness is not modified by damage. Finally, a simple model is proposed to describe this decrease of strength vs. matrix damage.