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Article Materials and Design ; Volume 46 , 2013 , Pages 654-659 ; 02641275 (ISSN) ; Naghdy, S ; Sharif University of Technology
In this work, hot tension tests were conducted on as cast and wrought samples of a high carbon high chromium tool steel to study the hot workability under the rolling conditions. The flow curves illustrate the classical shape of dynamic recrystallization (DRX). It is observed that broken carbide nets in the wrought samples result in lower deformation activation energy 398. kJ/mol in comparison to the as cast samples 432. kJ/mol. Necking strains were calculated using the inflection point of the work-hardening (θ) vs. stress curves. Wrought samples show higher hot ductility and lower maximum stress than the as cast ones. It is shown that lower activation energy of deformation and lower stress...
Article International Journal of Therapy and Rehabilitation ; Volume 14, Issue 2 , 2007 , Pages 63-69 ; 17411645 (ISSN) ; Karimi, H ; Farahmand, F ; Naghdi, S ; Faghihzadeh, S ; Sharif University of Technology
MA Healthcare Ltd 2007
The assessment of the various impairments in brain damage including spasticity is important. The purpose of this study was to develop a new biomechanical method based on quantification of velocity reduction (VR) suitable for clinical use