A Study of Non-destructive Indentation and Small Punch Tests for Monitoring Materials Reliability
소재의 안전전단을 위한 비파괴 압입 및 소형펀치 시험법 연구
- Ok Myoung-Ryul (Division of Materials Science and Engineering, Seoul National University) ;
- Ju Jang-Bog (Division of Materials Science and Engineering, Seoul National University) ;
- Lee Jeong-Hwan (Division of Materials Science and Engineering, Seoul National University) ;
- Ahn Jeong-Hoon (Division of Materials Science and Engineering, Seoul National University) ;
-
Nahm Seung Hoon
(Failure Prevention Center, Korea Research Institute of Standards and Science)
;
-
Lee Hae-Moo
(Failure Prevention Center, Korea Research Institute of Standards and Science)
;
-
Kwon Dongil
(Division of Materials Science and Engineering, Seoul National University)
- 옥명렬 (서울대학교 재료공학부) ;
- 주장복 (서울대학교 재료공학부) ;
- 이정환 (서울대학교 재료공학부) ;
- 안정훈 (서울대학교 재료공학부) ;
-
남승훈
(한국표준과학연구원 방재기술센타)
;
-
이해무
(한국표준과학연구원 방재기술센타)
;
-
권동일
(서울대학교 재료공학부)
- Published : 1997.09.01
Abstract
Indentation and small punch tests are very powerful methods to monitor the materials reliability since they are very simple, easy and almost non-destructive. First, recently-developed continuous indentation test can provide the more material properties such as hardness, elastic modulus, yield strength, work-hardening exponent, etc., than the conventional hardness test. In our study, the true stress-strain curve was derived from the indentation load-depth curve for spherical indentation. In detail, the strain was able to be obtained from plastic depth/contact radius ratio, and the flow stress was from mean contact pressure through the analysis of elastic-plastic indentation stress field. Secondly, the small punch test was studied to evaluate the fracture toughness and defomation properties such as elastic modulus and yield strength. Like the indentation test, this test can be applied without severe damage of the target structure.
Keywords