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Influence of through-thickness reinforcement aspect ratio on mode I delamination fracture resistance

机译：增厚纵横比对I型分层抗断裂性的影响

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摘要

Interlaminar reinforcement may be achieved in a composite laminate by the insertion and bonding of stiff rods through the thickness. It is experimentally shown in the paper that increased aspect ratio (AR) of through-thickness rods significantly elevates mode I maximum delamination fracture resistance of a laminate. This effect is explained through the analysis of rod/laminate interfacial stress transfer. Lower interfacial shear stresses occur for interlaminar rods of greater AR for equivalent bridging traction against opening delamination. Thereby, a larger AR allows the rod to develop a greater closure force prior to the rod debonding from the laminate. Further, these results show that this approach for interlaminar reinforcement is best applied to laminates of thickness-to-rod diameter ratio sufficient to allow for insertion of high aspect ratio reinforcement rods. (C) 2015 Elsevier Ltd. All rights reserved.
机译：可以通过在整个厚度范围内插入和粘合刚性棒来在复合材料层压板中实现层间加固。论文通过实验表明，增加厚度通孔棒的纵横比（AR）可以显着提高层压板的I型最大分层抗断裂性。通过分析杆/层压板的界面应力传递可以解释这种作用。对于等效的跨接牵引力以防止开口分层，较大的AR的层间杆会产生较低的界面剪切应力。由此，较大的AR允许杆在杆从层压体上脱粘之前产生较大的闭合力。此外，这些结果表明，这种层间增强方法最适用于厚度与棒直径比足以允许插入高纵横比增强棒的层压材料。 （C）2015 Elsevier Ltd.保留所有权利。

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