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ISSN: 2168-9873

Journal of Applied Mechanical Engineering
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Research Article

New Approach of Metals Ductility in Tensile Test

Badreddine R1*, Abderrazak D1 and Kheireddine S2

1Departement de metallurgie et génie des materiaux, laboratoire de metallurgie et genie des materiaux, universite badjimokhtar 23000 Annaba

2Research Center in Industrial Technologies, CRTI P. O. Box 64, Cheraga 16014 Algiers, Algeria

*Corresponding Author:
Badreddine R
Department de métallurgie et genie des materiaux
laboratoire de métallurgie et genie des matériaux
université badjimokhtar 23000 Annaba
Tel: +213 661 04 08 93
E-mail: [email protected]

Received date: June 14, 2016; Accepted date: June 30, 2016; Published date: July 03, 2016

Citation: Badreddine R, Abderrazak D, Kheireddine S (2016) New Approach of Metals Ductility in Tensile Test. J Appl Mech Eng 5: 225. doi: 10.4172/2168-9873.1000225

Copyright: © 2016 Badreddine R, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Abstract

Ductility is the ability of a material to deform plastically before rupture. This is an important feature in shaping because it helps to define the behavior of materials. Ductility is therefore essential to know and thus determine to anticipate the behavior of materials in various situations of stress. Ductility is commonly defined by the two parameters A elongation (in percent) or necking Z (in percent) with:

A(%) = ΔL/L_0(%) = (L_1-L_0)/L_0(%) and Z(%) = ΔS/S_0(%) = (S_0-S_1)/S_0(%)

These two parameters are determined from tensile tests on standard specimens.

We will focus on the study and analysis of ductility using the tensile test.

However these two indicators (A) and (Z) of the ductility may present deficiencies (contradictions) in the interpretation of the ductility in case where for two samples (1) and (2) with same original dimensions (Lo) and (So) and different composition we could have : A1>A2 and Z1<Z2 or A1 <A2 and Z1> Z2.

These two cases show the anomaly between A and Z in the assessment of the ductility, in fact in the first case the sample (1) is more ductile than the sample (2) in terms of elongation (A) is less ductile necking in terms of (Z) against the 2nd case we find the opposite behavior; it is this inconsistency that we will approach the ductility by introducing a parameter which will be called ductility (D) which takes into account the elongation and necking in a single formulation. In fact, (D) could remedy this deficiency involving computational approaches by activating the settings of the length (L) and Section (S) across the diameter (d) together in a first approach and to other computational approaches that take into account the elongation A and the neck.

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