A Study on the Measurement of Stress Intensity Factors for the Fatigue Crack Propagation

Oh, Dong-Jin; Kim, Myung-Hyun

doi:2012.30.6.80

J Weld Join > Volume 30(6); 2012 > Article

Research Paper

Journal of KWJS 2012;30(6):80-85.
DOI: https://doi.org/10.5781/KWJS.2012.30.6.80 Published online December 23, 2012.

A Study on the Measurement of Stress Intensity Factors for the Fatigue Crack Propagation

Dong-Jin Oh^*, Myung-Hyun Kim^*

Correspondence: Myung-Hyun Kim,
Email: kimm@pusan.ac.kr

Abstract

Fatigue cracks in structural components are the most common cause of structural failure when exposed to fatigue loading. In this respect, fatigue crack detection and structural health assessment are very important. Currently, various smart materials are used for detecting fatigue crack and measurement of SIFs(Stress Intensity Factors). So, this paper presented a measurement of SIFs using MFC(Micro Fiber Composite) sensor which is the one of the smart material. MFC sensor is more flexible, durable and reliable than other smart materials. The SIFs of Mode Ⅰ(KⅠ) as well as Mode Ⅱ(KⅡ) based on the piezoelectric constitutive law and fracture mechanics are calculated. In this study, the SIF values measured by MFC sensors are compared with the theoretical results.

Key Words: Fatigue crack, SIFs(Stress Intensity Factors), Piezoeletric effect