Equivalent Model Essay

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With respect to mechanical equivalent models, various mechanical equivalent models have been proposed for sandwich structures[11–14]; however, a certain equivalent model is usually and directly utilized as a research tool by previous investigations, rather than selecting an optimum equivalent model most suitable for aluminum honeycomb panels. The improper use of equivalent model in previous studies inevitably led to larger deviations. In this study, generally used mechanical equivalent models for sandwich structure are discussed and compared to the experimental data; further, the optimum equivalent model was determined and modified to reflect the mechanical properties of aluminum honeycomb panels more accurately. 1 Experimental 1.1 Flat…show more content…
Vertical loads are exerted continuously along the perpendicular direction to the face layer using an MTS experimental instrument at a loading speed of 0.5 mm/min until the failure of the sandwich structure or core layer. Consequently, the compressive strength and modulus can be further calculated by the failure load and the curve of load-deformation. Table 1 Specimen groups used in the flat crush test. 1.2 Flexural-tensile test Flexural-tensile tests were carried out according to GBT 1456-2005, i.e., "Test method for flexural properties of sandwich constructions"[16]. In this part, 11 specimen groups are involved, and every group consists of 5 specimens with an average size 400 mm × 150 mm and an average honeycomb grid size of 6 mm. Compared to the flat compressive test, besides the effects of the material and thickness of the face layer and core layer, the effect of the core layer layout on the flexural-tensile properties was also taken into consideration. Two different layouts, L-type and W-type, were designed, among which L-type layout denotes that one side of the honeycomb cell is parallel to the length direction of specimen, whereas W-type distribution denotes that one side of the
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