Failure Analysis of Low-density Polymer Foam Core Sandwich Structures under Three-point Bending Loading
Ç.Ü. Müh. Mim. Fak. Dergisi, 35(1), Mart 2020
10 Pages Posted: 11 Nov 2020
Date Written: march 10, 2020
In this study, low-density polymer foam core sandwich beams, non-existent in the literature, having woven carbon/epoxy face sheets in different core thicknesses and specimen lengths were fabricated and then subjected to three-point bending tests. The bending behavior of the sandwich beams were scrutinized experimentally. The effects of both core thickness and specimen length were revealed. As the ratio of face sheet to core decreases, transferring of shear forces between the face sheets decreases and the face sheets also become weaker. Hence, the failure mode changes from core shearing to indentation and the sandwiches have become tendency to fail by indentation. The theoretical models available in the literature was also utilized to predict the failure mode and collapse forces. The results indicated that both analytical calculations and experimental findings are compatible with each other.
Keywords: Core shear, Failure mode, Indentation, Sandwich structures, Three-point bending
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