Identification of Debonding Propagation in Ship Deck Sandwich Materials—Experimental Investigation

An innovative material currently being investigated is theSandwichsandwich materialSandwich material, which serves diverse purposes in marine vessels, such as for ramp doors, inner bottoms, passenger ship decks, stiffener plates, and bottoms. This investigation focuses on assessing coreCoredamageDamage in the sandwich materialSandwich material, particularly during theDebondingdebondingCrack debonding process. The research entails conducting experimentsExperiment utilizing laboratory-scale sandwichSandwich plates featuring three initial crack lengths: 25 mm, 50 mm, and 75 mm, while maintaining faceplates of 4 mm and a coreCore thickness of 20 mm. These experimentsExperiment subject the sandwichSandwich plates to tensile loading, mimicking the conditions ofDouble cantilever beam double cantilever beams (DCB) to illustrate mode I fracture delamination using theModified beam theory modified beam theory (MBT). The primary objective is to determine the energy strainStrain release rate and observe the propagation of debondingDebonding, a factor that significantly impacts the resilience of the sandwichSandwich plates. The experimental findings indicate that the strain energy release rateStrain energy release rate increases with longer crack lengths, but reaches a point where it decreases.