Kota, Manoj Kumar (2017) Effect of debonding on stiffness and long-term creep of sandwich panels. Coursework Masters thesis, University of Southern Queensland. (Unpublished)
Abstract
The purpose of this thesis is to analyse 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. There are many other failure modes such as face yielding, face wrinkling, intra-cell dimpling, core shear, and local indentation which are explained in the background. This research is mainly focused on debonding. Debonding is caused in facesheet/core interface when loaded. Sandwich beams are made of different types of materials and the different materials has different properties. Numerical modelling of sandwich beam with aluminium face sheet and polypropylene core. Analysis is performed using ANSYS software and the element used in the modelling is SHELL181. Four point load configuration is created for the model with loading of 60 % of core shear strength according to McCallum (2012) and the model is subjected to static deflection. Static deflection of sandwich beam model produced with an error of 7.9% compared with the theoretical calculations and with an error of 4.12 % with experimental data of McCallum (2012). The debonded sandwich beam has the higher deflection of 13% more than the deflection of bonded sandwich beam. After comparing the stiffness of bonded and debonded sandwich beams, bonded sandwich beam results to have more stiffness than the debonded sandwich beams. Primary and Secondary creep is evaluated in ANSYS using Time hardening and the Norton equations to the propylene core as it is viscoelastic material and the aluminium is in nature not prone to creep as more as polypropylene core. Burger model is used to fit with the secondary creep of the bonded sandwich beam as it has the linear slope and was resulted in 13% variance 5 with the ANSYS results though it is acceptable. The error might be caused due to the issue with Norton constants used in the analysis. The primary and the secondary creep of bonded and the debonded sandwich beams are compared. Debonded sandwich beam has the lower slope than the bonded sandwich beam. It might be due to local indentation. Further work is needed to analyse the creep behaviour of debonded sandwich beam in ANSYS by using combined hardening equation and by changing the frictional contact to get better results.
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| Item Type: | Thesis (Non-Research) (Coursework Masters) |
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| Item Status: | Live Archive |
| Additional Information: | Current UniSQ staff and students can request access to this thesis. Please email research.repository@unisq.edu.au with a subject line of SEAR thesis request and provide: Name of the thesis requested and Your name and UniSQ email address. |
| Faculty/School / Institute/Centre: | Current - Faculty of Health, Engineering and Sciences - No Department (1 Jul 2013 -) |
| Supervisors: | Banerjee, Sourish |
| Qualification: | Master of Engineering Sciences (Structural Engineering) |
| Date Deposited: | 14 Jul 2026 03:47 |
| Last Modified: | 14 Jul 2026 03:47 |
| URI: | https://sear.unisq.edu.au/id/eprint/53222 |
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