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소형펀치 시험법을 이용한 Al 2024 ECAP 재료의 강도특성 평가Assessment of Strength Characteristics of Al 2024 ECAP Metal Using Small Punch Testing
- Issue Date
- 2006
- Publisher
- 대한기계학회
- Keywords
- Small Punch Test; ECAP; Al 2024; Nanostructured Metal; Strength Assessment; Anisotropy; 소형펀치시험; 등통로각압축법; 알루미늄2024; 나노구조재료; 강도평가; 이방성
- Citation
- 대한기계학회논문집 A, v.30, no.1, pp 8 - 17
- Pages
- 10
- Journal Title
- 대한기계학회논문집 A
- Volume
- 30
- Number
- 1
- Start Page
- 8
- End Page
- 17
- ISSN
- 1226-4873
- Abstract
- When subjected to severe shear deformation by ECAP, microstructure of Al2024 becomes extremely refined. To measure the strength of that, small punch(SP) testing method was adopted as a substitute for the conventional uniaxial tensile testing because the size of material processed by ECAP were limited to φ12 mm in transverse direction. SP tests were performed with specimens in longitudinal and transverse directions of Al 2024 ECAP metal. For comparing the strength values with those assessed by SP tests, uniaxial tensile tests were also conducted with specimens in longitudinal direction. Failure surfaces of the tested SP specimens showed that failure mode was shear deformation and Al 2024 ECAP metal has an anisotropy in strength. Thus, conventional equations proposed for assessing the strength characteristics were improper to assess those of Al2024 ECAP metal. In this paper a way of assessing the strength of Al 2024 ECAP metal was proposed and was proven to be effective.
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