Experimental study on quasi-static bending and fatigue properties of PET foam sandwich structure
At the material scale,the mechanical properties of each component of polyethylene terephthalate(PET)foam sandwich struc-ture(PET foam core,aluminum alloy panel and adhesive),as well as the glass transition temperature and micro topological morphology of PET foam were obtained by experiments.At the structural scale,the three-point bending quasi-static experiments at different temperatures were conducted,and the influence of the temperatures on bending properties and influence mechanisms of temperature on deformation re-sponse process were investigated;meanwhile,three-point bending fatigue experiments were conducted at room temperature to analyze the effects of loading level and frequency on failure modes,fatigue life,stiffness degradation and other indicators;on this basis,three-point bending fatigue experiment considering temperature effect was conducted to explore the influence of environmental temperature on fatigue properties of PET foam sandwich structure.The results show that the deformation and failure mechanisms of PET foam sandwich structure under quasi-static and fatigue bending may be significantly influenced by temperature effect.
PET foam sandwich structurethree-point bendingfatiguetemperature effect
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