수정된 하중비법을 이용한 배관 시험편의 균열 길이 계산

다국어 초록 (Multilingual Abstract)

The objective of this paper is to apply the load ratio method to the measurement of the crack length of the real scale pipe specimen. The load ratio method was modified and finite element analyses were performed to derive the relationship between the normalized compliance and the normalized crack length for the pipe specimen. In order to measure the crack length, the direct current potential drop method and the modified load ratio method were applied to the pipe test. The applicability of the modified load ratio method was confirmed by comparing the calculated crack length with the measured crack length from the pipe experiment.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 하중비법의 수정
• 3. 표준 시험편의 균열 길이 계산
• 4. 균열 길이와 컴플라이언스와의 관계식
• 5. 배관의 균열 길이 계산
• 5. 결론
• 후기
• 참고문헌

참고문헌 (Reference)

1 ASTM, "Standard Test Method for Measurement of Fracture Toughness In:ASTM Standard E1820-01"

2 Hudak, S. J., "Review and Extension of Compliance Information for Common Crack Growth Specimens" 14 (14): 453-468, 1978

3 Landes, J.D., "Normalization method for developing J R curves – with the LMN function" 19 : 305-311, 1991

4 Lee, B. S., "J-R Characterization of CT Specimens by the Load-Ratio-Method" 990-995, 1997

5 Chen, X., "Improved Load Ratio Method for Predicting Crack Length In: Special Applications and Advanced Techniques for Crack Size Determination, ASTM STP 1251"

6 Moulin, D., "French Experimental Studies of Circumferentially Through- Wall Cracked Austenitic Pipes Under Static Bending" 65 (65): 343-352, 1996

7 Dutta, B. K., "Experimental and Analytical Study of Three Point Bend Specimen and Throughwall Circumferentially Cracked Straight Pipe" 77 (77): 455-471, 2000

8 Yoon, H. K., "Evaluation on Elastic Fracture Toughness of SA533B-1 Steel by Load Ratio Analysis and Multiple Specimen Method" A23 (A23): 1598-1605, 1999

9 Joyce, J. A., "Direct Evaluation of J-Resistance Curves from Load Displacement Records" 222-236, 1980

10 Landes, J. D., "Calculation of J From Test Records for the Growing Crack" 36 : R15-R20, 1988

11 Kackett E. M., "An Evaluation of J-R Curve Testing of Nuclear Piping Materials using the Direct Current Potential Drop Technique" 1986

12 Landes, J. D., "A New Look at J-R Curve Analysis" 36 : R9-R14, 1988