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首页> 外文会议>Proceedings of the American Society for Composites Twenty-Ninth technical conference, Proceedings of the 16th US-JAPAN conference on composite materials ASTM-D30 meeting >Failure Analysis of Unvented Honeycomb Structures
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Failure Analysis of Unvented Honeycomb Structures

机译：未通风蜂窝结构的失效分析

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摘要

Use of unvented aluminum honeycomb core in sandwich structures can lead to arnpositive differential pressure between the air trapped in the core and the externalrnenvironment. This pressure will increase as the aircraft or launch structure ascends orrnwhen entrapped gases are heated. Several launch and aircraft failures have occurred asrna result of the differential pressure combined with manufacturing flaws between therncore and the facesheet. The use of vented core is strongly recommended, but inrnexceptional cases where unvented core is the only option, a thorough analysis, test,rnnon-destructive evaluation, and acceptance program should be developed to define anrnallowable flaw for accepting, repairing, or rejecting the hardware. This paper providesrna brief outline of analysis and test methodologies for assessing unvented corernsandwich structures. A closed-form solution for critical debond size is presented andrnits limitations are discussed in light of results from finite element analysis using thernVirtual Crack Closure Technique. The effects of pressure differential, fracturerntoughness, facesheet thickness, core thickness, temperature exposure, and corernstiffness on the acceptable flaw size are investigated.
机译：在夹层结构中使用未通风的铝蜂窝芯可能会导致芯中捕获的空气与外部环境之间的正压差。当夹带的气体被加热时，该压力将随着飞机或发射结构的上升或上升而增加。由于压差以及铁芯和面板之间的制造缺陷，导致了几次发射和飞机故障。强烈建议使用通气芯，但在少数情况下，只有通气芯是唯一选择，应制定全面的分析，测试，无损评估和验收程序，以定义可接受，修复或拒绝硬件的可允许缺陷。 。本文提供了用于评估未通风芯夹心结构的分析和测试方法的简要概述。提出了用于临界脱粘尺寸的封闭形式解决方案，并根据使用虚拟裂纹闭合技术进行的有限元分析结果讨论了其局限性。研究了压差，断裂韧性，面板厚度，芯厚度，温度暴露和芯刚度对可接受的缺陷尺寸的影响。

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