Finite element model was used for modeling the structure. The effects of four different temperatures (0, 23, 40 and 60 ☌) on two core densities (80 and 130 kgm-3) and three core thickness (15, 20 and 25mm) were studied under the fracture behavior concept. The effects of core density and core thickness on the fracture behavior of the sandwich composites at different temperatures were examined. The special test apparatus was designed and manufactured for this experimental study. For testing mode I, Single Cantilever Beam (SCB) test configuration was distinguished in order to prevent crack kinking. The strain energy release rateGI values (SERR) was obtained by analytical and experimental methods. This study investigates the fracture behavior of the marine sandwich composite with a PVC foam core and face sheets of the glass fibre reinforced polymer fabricated by vacuum assisted resin infusion method. The various failure modes observed from the test are analyzed and used to illustrate the strengthening mechanics operating in the interface-reinforced honeycomb. Overall, the interfaced-reinforced cores performed much better than the traditional core, with the former and latter being stronger in the transverse and longitudinal directions, respectively. Modified Beam Theory (MBT) and Elastic Foundation Model (EFM) are employed to calculate the critical strain energy release rate. In addition, the influences of cell wall thickness and loading direction with respect to the orientation of core macrostructures are also investigated. Double cantilever beam (DCB) test is performed to compare the bonding and behavior of the beams, which are tested alongside beams of a traditional honeycomb that is used as a control sample. The two interfaces reinforced cores are identical, except for the presence of machined holes in the strengthened fillet created to accommodate adhesive fillets formed during bonding. A modified tailor-folding method is employed to fabricate two designs of the interface-reinforced honeycomb. To overcome this, in this paper, a type of interface-reinforced honeycomb core is proposed to improve the bonding by enlarging the bonding area and thus increasing the strength of the face sheet-to-core attachment. This has limited the development and the expanded application of these sandwich structures. The weakest link in traditional sandwich beams constructed of carbon fiber reinforced polymer (CFRP) honeycomb core is arguably the bonded face sheet-core interface.
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