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Criteria for skin rupture and core shear cracking induced by impact on sandwich panels

机译：冲击到夹芯板上引起的皮肤破裂和核心剪切开裂的标准

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Core shear cracking induced by impact on sandwich panels is a critical failure mode causing severe loss of structural performance. This paper reviews previous experimental and theoretical work in the area and derives improved closed form expressions for initiation of skin rupture and core shear cracking during impact on sandwich panels with foam cores. The criterion for skin rupture is also applicable to laminates without a core. It is shown that the skin rupture load limits the achievable core shear load, and that core shear cracking can be prevented by selecting a core thickness above a certain threshold value. The criteria are successfully validated by comparison with experimental results for a range of thicknesses of skins and cores in panels with carbon/epoxy skins and a Rohacell foam core. The criterion for skin rupture is also validated for plain laminates. (C) 2015 Elsevier Ltd. All rights reserved.
机译：冲击夹层板引起的岩心剪切开裂是一种严重的破坏模式，会导致结构性能的严重损失。本文回顾了该领域以前的实验和理论工作，并得出了改进的闭合形式表达式，用于在冲击带有泡沫芯的夹芯板期间引发皮肤破裂和芯剪切开裂。皮肤破裂的标准也适用于无芯的层压板。结果表明，表皮破裂载荷限制了可达到的岩心剪切载荷，并且通过选择高于一定阈值的岩心厚度可以防止岩心剪切开裂。通过与具有碳/环氧表皮和Rohacell泡沫内芯的面板中的一系列外皮和内芯厚度的实验结果进行比较，成功地验证了该标准。皮肤破裂的标准也适用于普通层压板。 （C）2015 Elsevier Ltd.保留所有权利。

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