Fracture Mechanics Analysis of Multi-Phase Material by Finite Eelement Method

유한요소법에 의한 다상재료의 파괴역학적 해석

The objective of this paper is to develop a numerical technique for analyzing crack driving forces in multi-phase materials. The analysis was based on finite element method coupled with a virtual crack extension technique which is known as the most efficient tool in computational fracture mechanics analysis. The modified J-integral method, proposed by Miyamoto and Kikuchi for the analysis of dual-phase material was carried out by subtracting the J-values for contours surrounding each phase boundary from the J-values for overall contour. It was shown that the proposed numerical procedure, based on the modified J-integral coupled with a virtual crack extension technique, can be used as an effective numerical tool for determining crack driving forces in multi-phase materials.

본 연구에서는 가상균열진전법과 수정 J-적분식을 연계하여 사용할 수 있는 유한요소 프로그램을 개발하고, 이 프로그램을 기존 결과가 있는 2상재료에 적응하여 타당성을 검토한 후, 다상재료의 경우에도 확장하였고, 실제 상변태가 발생하는 중수(heavy water)형 원자로 압력관(pressure tube)의 균열해석에 적용하여 보았다.