DCPD법을 이용한 배관 균열 길이 측정에 관한 연구

다국어 초록 (Multilingual Abstract)

In order to perform elastic-plastic fracture mechanical analyses, fracture resistance curves for concerned materials and real components are required. The unloading compliance method and the DCPD(Direct Current Potential Drop) method have been widely used for measuring the crack length and the extension for the standard specimen fracture resistance curve test. But the unloading compliance method is to be difficult on the real pipe fracture resistance curve test. The objective of this paper is to propose the calibration equation between the normalized crack length and the normalized electric potential, and to adapt to real pipe fracture resistance curve test. For these, finite element analyses were performed with various current input locations and crack front configurations, and the 4-point bending jig was manufactured for the pipe test and the DCPD method was used to measure the crack extension and the length for the pipe test. From the real pipe test results, it was observed that the crack extended to between the circumferential and the longitudinal direction and the modified crack length on the crack extension direction was to agree with test results within 5% errors.

목차 (Table of Contents)

• 1. 서론
• 2. 시험 장비 및 시험편
• 3. 균열 길이 측정을 위한 관계식 결정
• 4. 배관 파괴 저항 시험
• 5. 결론
• 참고문헌