# 탄성일인자방법을 적용한 단일방향 탄소섬유/에폭시 DCB 시편의 파괴인성 결정

Rhee, Kyeong-Yeop;Lee, Joong-Hee
이경엽;이중희

• Published : 1998.03.01
• 16 4

#### Abstract

Compliance calibration method is frequently used to determine $G_IC$ from the DCB composite specimen. However, the method requires at least 4 to 5 fracture test (loading-unloading) records. In this study, $G_IC$ of unidirectional graphite/epoxy DCB composites was determined from the elastic work factor approach which uses a single fracture test record. In order to inspect the validity of the elastic work factor approach, $G_IC$ determined from the elastic work factor approach was compared to that of determined from the compliance calibration method. It was shown that $G_IC$ determined from the elastic work factor approach was comparable to that determined from the compliance calibration method. That is, the elastic work factor approach can be used to determine $G_IC$ of unidirectional graphite/epoxy DCB specimen from a single fracture record.

#### Keywords

DCB Specimen;Laminated Composites;Energy Release Rate;Mode I Fracture Toughness;Compliance;Elastic Work Factor Approach;Compliance Calibration method