BONDING OF SANDWICH STRUCTURES - THE FACESHEET/HONEYCOMB INTERFACE - A PHENOMENOLOGICAL STUDY

摘要

A predominant failure mechanism in sandwich structures is the de-bonding of the composite face-sheets from the core structures. In general, this type of de-bonding is initiated by impact damage on the surface and propagated by a flexural load where the damaged area is subjected to compression or cyclic fatigue. In case of core materials manufactured from Kevlar~R N636 and Nomex~R T412 papers, guideline to improve this bond will be discussed. The surface preparation prior to bonding is critical, but differs in cases of metallic versus non-metallic cores. Strength of these types of bonds is generally measured by climbing drum peel test - which is inadequate to compare strength of adhesion between dissimilar (composite) materials. Morphological examination of the failed surface will be presented to provide routes to better adhesion and adhesion test.