| Title |
Evaluation of Luders Strain by Analyzing the Deformation Characteristics around the Residual Indentation in Structural Steels |
| Authors |
최열(Yeol Choi),안정훈(Jeong Hoon Ahn),최종교(Jong Kyo Choi),주웅용(Wung Yong Choo),권동일(Dong Il Kwon) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
The continuous indentation test was used to evaluate Lu¨ders strain of various steels such as ultra-fine grained steels and AISI 1020 steels. Inhomogeneous pile-up deformation in the indentation test could be related to Lu¨ders strain in tensile test. The pile-up deformation could be characterized as a localized flow phenomena. We analyzed the pile-up area as the parameter of Lu¨ders strain, and described the pile-up amount more quantitatively by considering the relation between plastic-zone size and pile-up radius. Finally, we derived the master curve for some steels, which included the ratio of elastic modulus to hardness as plastic-zone size. For various steels in this study, the values of Lu¨ders strain obtained from the master curve are consistent with those measured from the tensile test. |