Analysis of interface fatigue debonding characteristics of type-Ⅰ steel sandwich plate
[Objective]In view of the failure of type-Ⅰ steel sandwich plate interfaces,this paper analyzes their interface fatigue debonding characteristics.[Methods]Based on the cohesive force model and consid-ering the time history,damage evolution equations and convergence criteria of 3D structural nodes with mul-tiple degrees of freedom,an interface fatigue debonding simulation program suitable for 3D complex struc-tures is developed.The accuracy of the developed program is verified through a comparison with the experi-mental results of welding joint debonding,and the interface fatigue debonding behavior of type-Ⅰ steel sand-wich plates is simulated numerically.[Results]The results show that the maximum simulation error between the 3D interface fatigue debonding test and debonding experimentis only 14.05％.When an type-Ⅰ sandwich plate is subjected to out-of-plane load,the debonding failure at the interface mainly manifests as sur-face crack propagation in the direction of the extended weld.When the crack propagation reaches about 70％of the length of the plate,the crack begins to penetrate through the web to form a penetrating crack.[Conclusion]The interface fatigue debonding program developed herein can effectively evaluate the inter-face fatigue debonding life of type-I steel sandwich plates,giving it certain guiding significance for practical engineering applications.
type-Ⅰ metal sandwich panelinterface debondingcohesive force modelweld defects3D complex structure
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