Attiyannan, Bharani Dharan (2017) Creep Response of Sandwich Panels with Thermoplastic core. Research Masters thesis, University of Southern Queensland. (Unpublished)
Abstract
The purpose of the thesis is to analyze the behavior sandwich panel with thermoplastic core under creep. In addition to creep behavior, thermoplastic core which is a viscoelastic material can fail from indentation due to concentrated load. Indentation is analyzed by calculating the deflection of the skin. The skin is supported by viscoelastic medium and using Winkler foundation model, the deflection of the skin is analytically modelled. In the timescale we are considering the skin does not creep but the core creeps.
The creep of sandwich panel with polypropylene core is predicted using the creep compliance material function property. The material property relaxation modulus is first calculated from stress relaxation data. The Burger mechanical model is used to fit the relaxation modulus data as Burger model closely predicts the real behavior of viscoelastic materials. The relaxation modulus is then converted to creep compliance using the interconversion method. Then the creep strain is calculated using the creep compliance when a sandwich panel is loaded at 20%, 40% and 60% of its core shear strength. The creep strain curves showed nonlinear scaling with increase in applied stress. At lower stress levels it is linear scaling to an approximation, which conclude that the creep strain can be predicted in sandwich panels under lower stress levels.
ANSYS simulation software is used for numerical modelling of sandwich beam using SHELL 181 element. Static deflection check of the model produced 17.9% error compared with experimental data. Analyzing for creep behavior in ANSYS produced errors and desired results were not attained. Further work is required in analyzing creep behavior of sandwich h panels in ANSYS.
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| Item Type: | Thesis (Non-Research) (Research Masters) |
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| Item Status: | Live Archive |
| 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: | 19 Mar 2026 03:24 |
| Last Modified: | 19 Mar 2026 03:24 |
| Uncontrolled Keywords: | sandwich panel; thermoplastic; creep |
| URI: | https://sear.unisq.edu.au/id/eprint/53185 |
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