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- W935178971 abstract "The response of honeycomb sandwich structure to disbond damage, in a compressive stress field,has been assessed. Two types of disbond were considered; those extending through the full width ofa panel (through-width) and those enclosed within the panel boundaries (embedded). For each typeof disbond the failure process was established through four-point bend testing of 56 sandwichspecimens. For both types of disbond, failure was found to be governed by buckling-driven disbondgrowth and, consequently, models of buckling and disbond growth were developed.All of the models decoupled the face-sheets of the sandwich and treated the core as a springfoundation having a stiffness determined from equilibrium of a two-dimensional orthotropic solid.A linear Winkler beam model was used to predict buckling of a through-width disbond. The modelbuckling loads agreed with specimen test results with an average difference of 1.7%. A non-linearWinkler beam model was then developed to predict post-buckling behaviour and the initiation ofdisbond growth, through a fracture mechanics analysis. A characteristic growth curve, defining thework input required to initiate disbond growth, was developed and agreed with specimen test resultswith an average difference of 3.3%. The model also verified that disbond growth occurs in discreteincrements approximately equal to the diameter of the honeycomb cells.A linear Winkler plate model was used to predict buckling of an embedded disbond. The modelbuckling loads agreed with specimen test results with an average difference of 3.7%. A non-linearWinkler plate model was then developed to predict post-buckling behaviour of a sandwich panelcontaining an embedded disbond. The model considered contact conditions and modelled disbondgrowth by releasing fractured nodes during load incrementation. Disbond growth initiation loadsagreed with specimen test results with an average difference of 15.8%. Failure loads consistentlyover-predicted specimen test results by an average of 13.9%. It was concluded that the growthinitiation loads should be used as a conservative estimate of failure.The models developed may be used to assess the criticality of disbond damage in sandwich structurehaving thin-gauge, composite face-sheets." @default.
- W935178971 created "2016-06-24" @default.
- W935178971 creator A5037569749 @default.
- W935178971 date "2005-01-01" @default.
- W935178971 modified "2023-09-23" @default.
- W935178971 title "Buckling and growth of disbonds in honeycomb sandwich structure" @default.
- W935178971 hasPublicationYear "2005" @default.
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