Fractal analysis on fracture toughness of particulate composites

J. Ocean Eng. Technol. 1996;10(4):84-91.

입자강화 복합재료의 파괴인성에 관한 프랙탈 해석

김엄기,남승훈,고성위

공주대학교 기계공학과,한국표준과학연구원,부경대학교 제어계측공학과

Keywords: Fractal, Dimension, Fracture Toughness, Particulate Composites, Fractography

핵심용어: 프랙탈, 차원, 파괴인성, 입자강화 복합재료, 파단면 해석법

Abstract

A fractal analysis on fracture surface of aluminium-particulate SiC composites was attempted. As the volume fraction of SiC in composites increases, the fractal dimension tends to increase. However, no correlation between the fractal dimension and the fracture toughness in terms of critical energy release rate was observed. Since the fractal dimension represents the roughness of fracture surface, the fracture toughness would be a function of not only fracture surface roughness but also additional parameters. Thus the applicability of fractal analysis to the estimation of fracture toughness must depend on the proper choice and interpretation of additioal paramerters. In this paper, the size of characteristic strctural unit for fracture was considered as an additional parameter. As a result, the size appeared to be a function of only volume fraction of SiC. Finally, a master curve for fracture toughness of aluminium-particulate SiC composites was proposed as a function of fractal dimension and volume fraction of SiC.