A Study On the Factors that Affect Fatigue Crack Growth Rate in Steels - Specimen Thickness Effect -

J. Ocean Eng. Technol. 1999;13(2):58-65.

Kim, Seon-Jin;Nam, Ki-Woo;Hong, Jin-Pyo;

강재의 피로균열전파율에 미치는 영향인자에 관한 연구

김선진;남기우;홍진표;

부경대학교 기계 ${cdot}$자동차공학부;부경대학교 재료공학부;한전기공(주);

Keywords: Specimen Thickness, Fatigue Crack Growth Rate, Variation, Fatigue Crack Growth Resistance, Size Effect, Weibull Distribution

핵심용어: 시험편 두께, 피로 균열전 파율, 변동성, 피로 균열전파저항, 치수효과, 와이블분포

Abstract

The effect of specimen thickness on fatigue crack growth rate was studied. The objective of the present study is to investigate the effect of specimen thickness on the fatigue crack growth behavior at various stress intensity factor ranges and also the variation of material restance to fatigue crack growth. The fatigue crack growth resistance was treated as a spatial stochastic process, which varies randomly on the crack path, Compact tension specimens with a LT orientation for structural steel were used. All testing was done at a constant stress intensity level. The experimental data were analyzed for the size effect to determine the Weibull distributions of the material resistance.