A New Fracture Analysis Technique for Charpy Impact Test Using Image Processing

다국어 초록 (Multilingual Abstract)

The Charpy impact test is used to identify the transition between ductility and brittleness. The percentages of ductile and brittle fractures in steel can be evaluated based on each fracture area, which is presently determined by an analyzer with the naked eye. This method may lead to subjective judgement, and difficulty accurately quantifying the percentage. To resolve this problem, a new analysis method based on image processing is proposed in this study. A program that can automatically calculate the percentage of the ductile and brittle fractures has been developed. The analysis is performed after converting an RGB fracture image into a binary image using image processing techniques. The final binary image consists of 0 and 1 pixels. The parts with the pixel values of 1 correspond to the brittle fracture areas, and the pixel values of 0 represent the ductile fracture areas. As a result, by counting the number of 0 pixels in the entire area, it is possible to automatically calculate the percentage of ductile fracture. Using the proposed automatic fracture analysis program, it is possible to selectively distinguish only the brittle fracture from the entire fracture area, and to accurately and quantitatively calculate the percentages of ductile and brittle fractures.

참고문헌 (Reference)

1 Z. Zhou, 97 : 836-, 2019

2 D. G. Bailey, 3 : 99-, 1985

3 M. P. Manahan, 25 : 3429-, 1990

4 S. Rzepa, 179 : 2017

5 S. S. Sutar, 1 : 1-, 2014

6 A. M. Muiruri, 29 : 284-, 2018

7 V. Dudko, 134 : 649-, 2018

8 B. Tanguy, 72 : 413-, 2005

9 D. Napoleon, 1 : 194-, 2013

10 Y. N. Mamatha, 40 : 174-, 2012

11 Khushbu, 5 : 11945-, 2017

12 S. Das, 3 : 180-, 2015

13 M. Zhang, 17 : 2324-, 2008

14 K. He, 1 : 1-, 2010

15 H. J. Vala, 2 : 387-, 2013

16 X. Yang, 3 : 468-, 2012

17 황병철, "고인성 라인파이프강의 인성과 천이온도의 분석 1. Charpy 충격특성과 유효결정립도" 대한금속·재료학회 42 (42): 691-700, 2004

18 C. Tomasi, "Bilateral Filtering for Gray and Color Images" 839-, 1998

19 "ASTM E23-18, Standard test methods for notched bar impact testing of metallic materials"

20 민경준, "API X80 라인파이프 강의 인장 및 샤르피 충격 특성에 미치는 Mo 및 Nb의 영향" 대한금속·재료학회 49 (49): 766-773, 2011