Abstract
This study was designed to predict work hardening exponent n of materials from AFM (atomic force microscope) observations of residual indentation impression in sharp indentations. FE simulations of nano-indentation were performed to 140 combinations to each parameter (elastic modulus E, yield stress σ y , work hardening exponent n, and Poisson’s ratio gv) expressing elastic-plastic behaviors of universal engineering metals. Using the results from FE simulations and dimensional analysis, dimensionless functions were established to correlate residual indentation profiles with the work hardening exponent. This function was examined with nano-indentation, tensile test, and AFM observations after indentation for two materials (Al6061-T6 and copper).
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Byung-Min Kim received his B.S. degree (1979), M.S. (1984) and Ph.D. (1987) from Pusan National University. He is currently a Professor at the School of Mechanical Engineer-ing at Pusan National University, and currently serving as a Director in PNU-IFAM Joint Research Center. His major area is metal forming process and hybrid joining technology.
Jung-Min Lee received his B.S. Degree(2001), M.S. (2003) and Ph.D. (2008) from Pusan National University. He is currently a Researcher at Korea Institute of Materials Science. His major area is metal forming process.
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Kim, BM., Lee, CJ. & Lee, JM. Estimations of work hardening exponents of engineering metals using residual indentation profiles of nano-indentation. J Mech Sci Technol 24, 73–76 (2010). https://doi.org/10.1007/s12206-009-1115-8
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DOI: https://doi.org/10.1007/s12206-009-1115-8