Abstract
The main objective of this study was to analyze the effect of debonding on the stiffness and long-term creep of sandwich panel. Sandwich panel is made of thermoplastic core which is viscoelastic in nature and debonding is the major failure mode of the sandwich panel. Sandwich beams were made of different types of materials and the different materials have different properties. Numerical modeling of sandwich beam with aluminium face sheet and polypropylene core is done. Analysis was performed by using ANSYS software and the element used in the modeling is SHELL181. Four-point load configuration was created for the model with loading of 60 % of core shear strength according to McCallum (2012) and the model were subjected to static deflection. Static deflection results were compared with experimental and theoretical results and stiffness of deboned sandwich beam was evaluated. Primary and Secondary creep was evaluated in ANSYS by using Time hardening and the Norton equations to the propylene core and Burger model was used to fit with the secondary creep of the bonded sandwich beam. The primary and the secondary creep of bonded and the deboned sandwich beams were compared and long-term creep of deboned sandwich beam was determined.
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