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Evaluation of methods for the analysis of buckling in composite laminate and sandwich plates subject to uni-axial compression
Jayaratne, Tharindu
Jayaratne, Tharindu
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t24054_Jayaratne.pdf
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2024-12
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Accurate analysis of buckling in composite structures, especially sandwich configurations, is critical for realizing the maximum weight savings potential that composites have to offer. This document first investigated the available analytical methods for determining critical buckling load in composites and testing performed to validate those methods. Test panels of various composite structural configurations were fabricated, and an experimental study conducted to determine the critical buckling load of these under uniaxial compressive loading. Digital image correlation was utilized to capture the buckling mode shape of test panels.
Various methods of determining critical buckling load from experimental data were evaluated and using a linear fit to the post-buckling regime of the load vs deflection squared plot was selected as the best method. Experimental critical buckling loads were compared to analytical methods when available and they correlated well. Finite element models were setup for the various configurations and eigen value solutions were obtained. Sensitivity studies were conducted for various modelling methods, mesh sizes, element types and usage of elemental offsets.
Applying offsets by invoking ZOFFS in the PCOMP card had no impact on critical buckling load. Both CQUAD and CQUADR elements yielded accurate results for solid laminates whilst CQUADR elements were more appropriate to model sandwich plates, as CQUAD elements and 3D elements tended to overpredict the buckling load. For asymmetric sandwich plates, no linear buckling analysis method was found to accurately predict both critical buckling load and mode, however modelling the core ramp region as solid laminate or non-linear buckling analysis yielded the better results. In conclusion, analysis methods for solid laminates and sandwich plates were found to be reasonably accurate. Further work is required to understand and accurately predict critical buckling loads for asymmetric sandwich plates.
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Thesis (M.S.)-- Wichita State University, College of Engineering, Dept. of Aerospace Engineering
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Wichita State University
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