Document Details

Document Type : Thesis 
Document Title :
Yield stress sensitivity to Strain rate in Metals
حساسية الخضوع لمعدل الانفعال في المعادن
 
Subject : Faculty of Engineering - Department of Mechanical Engineering 
Document Language : Arabic 
Abstract : The research on mechanical characteristics of materials keep improving continuously in a purpose to be more accurate and specific. This thesis studies six constitutive equations already used in literature to describe the sensitivity of the yield stress to strain rate, it was discussed on this thesis to verify its validity to be applied on the metals by comparing it with the available experimental data in the literature for metals as the following , Couqe equation shown the best agreement with the experimental data but it was used to four parameters, standard Johnson Cook, modified Johnson Cook and Huh-Kang equations three of them wasn’t accepted to be applied on metals yield stress, because the standard Johnson cook haven’t good curve fitting with the experimental data for both copper and steel, the modified Johnson Cook equation shown also not accepted curve fitting shape, and the Huh Kang equation shown high percentage error and low correlation coefficient to the yield stress curve in addition to the not accepted curve fitting shape. The modified Eyring and Zerilli Armstrong equations shown good error percentage and stress curve fitting in addition to its involved to the lowest number of parameter so it was preferred and chosen as the constitutive equations that can be applied to study Yield stress sensitivity to strain rate in Metals with the lowest parameters in addition to Couqe equation which is involved to four parameters in its form. 
Supervisor : Dr. Ramzi Othman 
Thesis Type : Master Thesis 
Publishing Year : 1437 AH
2016 AD 
Added Date : Tuesday, June 7, 2016 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عمار عبدالجليل الصلاحيAl salahi, Ammar AbduljalilResearcherMaster 

Files

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 39198.pdf pdf 

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