Study on elastic-plastic behaviour of inclusions in cold drawn wire by using reverse analysis and nanoindentation test

¹ PNU-IFAM JRC, Pusan National University, Geumjeong-gu, Busan, Korea
² Dongnam Regional Division, Korea Institute of Industrial Technology, Gangseo-gu, Busan, Korea
³ School of Mechanical Engineering, Pusan National University, Geumjeong-gu, Busan, Korea
⁴ ERC/ITAF, Pusan National University, Geumjeong-gu, Busan, Korea

^a Corresponding author: e-mail: bmkim@pusan.ac.kr

Abstract

The purpose of this study is to investigate the elastic-plastic behavior of inclusions, i.e. SiO₂ particles, in cold drawn wire using reverse analysis and nanoindentation test. First, the nanoindentation tests were performed to obtain indentation load P – penetration depth h curves. Second, the reverse analysis which is consisted of various dimensionless functions including change in E^∗/σ_r, W_p/W_t and n was used to extract the elastic-plastic properties of the indented inclusions and metals from indentation responses. To verify the accuracy of calculated properties, uniaxial tensile tests were performed for different materials which are AISI 1045 and AISI 1080. Results (E, σ_y, n) of tensile tests for each material were also compared with those of nanoindentation tests.