article · Mechanics of Advanced Materials and Structures
Functionally graded sandwich beams undergo complex deformations when exposed to simultaneous moisture, temperature changes, and physical forces. A recent investigation evaluates the bending behaviour of these advanced composite beams under combined hygro-thermo-mechanical loads, taking into account material properties that alter with variations in temperature and humidity. The analysis evaluates beam configurations constructed through distinct material distribution rules, including power-law, exponential, and sigmoidal schemes in both symmetric and unsymmetric arrangements. Using a finite element model based on higher-order zig-zag theory, the formulation maintains inter-laminar shear stress continuity across internal layers and zero shear stress at external surfaces. Notably, the assessment identifies upward displacement in the composite beams under specific combined loadings. Detailed stress distributions and displacement values are mapped out, delivering structural baseline data for future computational and theoretical investigations.
Composite components operating in demanding environments frequently face combined shifts in humidity, temperature, and physical stress. Understanding how these interacting factors drive bending and internal stresses helps structural analysts anticipate structural deformation and prevent premature failures in advanced sandwich structures subjected to severe operational environments.
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In the present work, an attempt has been made to carry out the bending analysis of sandwich FGM beams under combined hygro-thermo-mechanical loadings. Temperature and moisture-dependent material properties are used during the present study. A comparative study has also been carried out between the beams made up of different homogenization rules. The study has been carried out using recently proposed finite element-based HOZT. The present model satisfies the inter-laminar transverse shear stress continuity condition at interfaces and the zero condition at the top and bottom surfaces of the beam. The data is presented in the form of tables for displacement and stresses and graphs representing stress distribution across the thickness of the beam. For the first time, upward displacement of the sandwich FGM beam has been reported in the present work when subjected to hygro-thermo-mechanical loading. Several new results are also reported in the present work, which will serve as a benchmark for future studies in a similar direction.
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DOI: 10.1080/15376494.2021.1931993
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