단일섬유 복합재료의 계면 전단강도를 평가하기 위한 새로운 반구형 미소접합시험

Abstract

Interfacial shear strength between epoxy and carbon fiber was analyzed utilizing the hemispherical microbond specimens adhered onto single carbon fiber. The shear stress distributions along the fiber/matrix interface were calculated by finite element analyses using such models as hemispherical, droplet, and cylindrical pull-out. (1) The interfacial shear stress analysis showed that lower stress concentration arose along the fiber/matrix interface for the hemispherical microbond specimen than for the droplet one. (2) Hemispherical microbond specimens showed low interfacial strength, which was caused by the reduction of the meniscus effects and the stress concentration in the region contacting with the tip of micro-vise and/or pin hole.