An Analytic Research on the Damage of Plank joined with CFRP, Mg, AI and AIfoam under Torsional Load

Abstract

Background/Objectives: As lightweight materials,most of the studies have been focused on the destruction characteristics of a single material.Butthose materials as composites were examined in this study.

Methods/Statistical Analysis: Most of the studies in this field have been usedwith opening mode under a tensile load. On the other hand, this research was utilized with tearing mode under the anti-planar shear load to examine the destruction characteristics of specimens under torsional load. The specimen designswere conformed with the standard of ISO15310 to describe the experiments with specimens of each material combination under a torsional load.

Findings: In terms ofequivalent stresses on the specimens with each material combination, the maximum value was shown for the plank with CFRP and AIfoam combination. As other combinations, the specimen with Mg had higher equivalent stress. The equivalent stress as specific strength also demonstrated higher strength for the specimen with Mg than AI. The graph of reaction to displacement showed that the damage of CFRP’s fibrous layer caused the numerous amplitudeson the latter part of graph. Moreover, though the maximum reactions at specimens with Mg and AI seemed to be similar, the plankjoined with Mg and AIfoam had lighter weight and higher strength. As shown bythe adhesive damage trend, the displacement over 3mm reduced the adhesive strength by causing the plankto separations, and the separation occurred firstly at the parts against a jig. As seen by the maximum shear stress on the top of specimen, theplank with Mg and AIfoam combination were shown to have higher values than the otherplanks.

Improvements/Applications:  This research was investigated on the damagesof lightweight composite materials. This study result can be applied for the improvements on the parts of automobiles, airplanesand ships. 

Keywords: CFRP(Carbon fiber reinforced plastic), Adhesive, Torsional load,Tearing mode, Plank, Damage