Application of Pre-Strained Steels in Empirical Correlation Between Small Punch Test and Uniaxial Tensile Test

2020 ◽  
Vol 12 (6) ◽  
pp. 892-898
Author(s):  
Gang Liu ◽  
Kai-Shu Guan ◽  
Ji-Ru Zhong
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Tensile Test ◽  
Maximum Load ◽  
Empirical Correlation ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Small Punch Test ◽  
Punch Test

In order to research the method of strength empirical correlation between conventional small punch test (SPT) and uniaxial tensile test, a series of austenitic stainless steel including pre-strained SUS304 have been tested in this study. The conventional SPT is conducted on a small disc-shaped specimen whose edge is firmly gripped by a die, and the specimen is deformed by a punch. The method of empirical correlation between SPT and uniaxial tensile test is a direct way to obtain the mechanical properties of materials. Through establishing the strength empirical correlation, it can achieve to calculate the strength of material by SPT which is nondestructive to equipments. However, the per-strained steels have never been tested in this method. This study is to fill that gap and to obtain the empirical correlation between SPT and uniaxial tensile test with pre-strained steel. In this study, a series of austenitic stainless steel including SUS304 after different levels of pre-strain were tested successively by uniaxial tensile test and SPT. It is found that the tensile strength obtained from uniaxial tensile test increases with the increasing levels of pre-strain. However, the maximum load obtained from prestrained SPT specimen does not increase with the increasing levels of pre-strain. It is contradictory to the linear relation between maximum load and tensile strength. According to the analysis of conventional discshaped SPT specimen, the directions of maximum load obtained from SPT and tensile strength from tensile test are not uniform. It results in the non-linearity between the maximum load and the tensile strength with pre-strained steel, and it indicates the pre-strained steel cannot be applied to the conventional disc-shaped SPT specimen. Furthermore, the prestrained steel is a typical kind of anisotropic material. Therefore, extending to anisotropic material, the conventional disc-shaped SPT specimen is not suitable for the method of strength empirical correlation.

Design and development of aluminum alloy 6061-T6 pressure vessel liner for aerospace applications: A technical brief

2021 ◽  
pp. 146442072110651
Author(s):  
R Pramod ◽  
N Siva Shanmugam ◽  
C K Krishnadasan ◽  
G Radhakrishnan ◽  
Manu Thomas
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Weld Metal ◽  
Tensile Test ◽  
Pressure Vessel ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Aluminum Alloy 6061 ◽  
Custom Made ◽  
Alloy 6061

This work mainly focuses on designing a novel aluminum alloy 6061-T6 pressure vessel liner intended for use in launch vehicles. Fabrication of custom-made welding fixtures for the assembly of liner parts, namely two hemispherical domes and end boss, is illustrated. The parts of the liner are joined using the cold metal transfer welding process, and the welding trials are performed to arrive at an optimized parametric range. The metallurgical characterization of weld joint reveals the existence of dendritic structures (equiaxed and columnar). Microhardness of base and weld metal was 70 and 65 HV, respectively. The tensile strength of base and weld metal was 290 and 197 MPa, respectively, yielding a joint efficiency of 68%. Finite-element analysis of a uniaxial tensile test was performed to predict the tensile strength and location of the fracture in base and weld metal. The experimental and predicted tensile test results were found to be in good agreement.

A Method for Estimating Uncertainty of Indentation Tensile Properties in Instrumented Indentation Test

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Eun-chae Jeon ◽  
Joo-Seung Park ◽  
Doo-Sun Choi ◽  
Kug-Hwan Kim ◽  
Dongil Kwon
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Tensile Test ◽  
Tensile Properties ◽  
Indentation Test ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Instrumented Indentation ◽  
Estimation Model ◽  
Instrumented Indentation Test

The instrumented indentation test, which measures indentation tensile properties, has attracted interest recently because this test can replace uniaxial tensile test. An international standard for instrumented indentation test has been recently legislated. However, the uncertainty of the indentation tensile properties has never been estimated. The indentation tensile properties cannot be obtained directly from experimental raw data as can the Brinell hardness, which makes estimation of the uncertainty difficult. The simplifying uncertainty estimation model for the indentation tensile properties proposed here overcomes this problem. Though the influence quantities are generally defined by experimental variances when estimating uncertainty, here they are obtained by calculation from indentation load-depth curves. This model was verified by round-robin test with several institutions. The average uncertainties were estimated as 18.9% and 9.8% for the indentation yield strength and indentation tensile strength, respectively. The values were independent of the materials’ mechanical properties but varied with environmental conditions such as experimental instruments and operators. The uncertainties for the indentation yield and tensile strengths were greater than those for the uniaxial tensile test. These larger uncertainties were caused by measuring local properties in the instrumented indentation test. The two tests had the same tendency to have smaller uncertainties for tensile strength than yield strength. These results suggest that the simplified model can be used to estimate the uncertainty in indentation tensile properties.

scholarly journals Tensile Properties of Polymer Repair Materials - Effect of Test Parameters

2015 ◽  
Vol 1129 ◽  
pp. 445-452
Author(s):  
Z. Kamil ◽  
G. Andrzej ◽  
C. Sandra ◽  
A.J. Barroso
Keyword(s):  
Tensile Strength ◽  
Tensile Test ◽  
Modulus Of Elasticity ◽  
Deformation Rate ◽  
Effect Of Temperature ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Sample Shape ◽  
Repair Materials ◽  
Test Parameters

In this research, five types of polymer repair materials were selected for investigation of the influence of sample shape, deformation rate and test temperature on the mechanical properties determined with an uniaxial tensile test. The results showed the clear effect of measurement conditions on tensile strength, elongation and modulus of elasticity. The highest tensile strength and modulus of elasticity were exhibited by epoxy resin for the filling of concrete cracks, which achieved 1% elongation. The lowest coefficient of dispersion characterized the results of tensile test carried out using dumbbell samples at a deformation rate of 50 mm/min. The effect of temperature varied with the material type.

Experimental Study on Electroplastic Effect in AISI 316L Austenitic Stainless Steel

2015 ◽  
Vol 792 ◽  
pp. 568-571 ◽  
Author(s):  
Marco Breda ◽  
Francesco Michieletto ◽  
Elizaveta Beridze ◽  
Claudio Gennari
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Electric Current ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Aisi 316L ◽  
Flow Properties ◽  
Electroplastic Effect ◽  
316L Austenitic Stainless Steel ◽  
Electrically Assisted Manufacturing

Electrically Assisted Manufacturing (EAM) is a recently developed method for materials forming based on the Electro-Plastic Effect (EPE) induced by electric current on the flow properties of the material and enhancing their workability. In this technique, the concept of dislocations/electrons interaction and the localized resistive heating provided by electric current were found to be the main responsible for the observed increase in materials formability. However, the joule heating may hinder the induced EPE, since heat and electricity are contemporarily both present, and separation between these two contributions is mandatory to better understand the solely effect of electricity on plastic flow. The present experimental work on an AISI 316L austenitic stainless steel is aimed to study EPE by separating the effects of current from those of heating during EAM uniaxial tensile test, in order to ascribe the relative contributions.

scholarly journals Punching test for estimating tensile strength and total elongation of steel sheets

2021 ◽  
Author(s):  
Naotaka Nakamura ◽  
Ken-ichiro Mori ◽  
Hiroki Okada ◽  
Yohei Abe
Keyword(s):  
Tensile Strength ◽  
Shear Stress ◽  
Tensile Test ◽  
Total Elongation ◽  
Linear Functions ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Laboratory Environment ◽  
Steel Sheets ◽  
Sheared Edge

AbstractA punching test for simply estimating the tensile strength and total elongation of steel sheets and formed parts was proposed. The tensile strength and total elongation were estimated from the shear stress at the maximum punching load and percentage of the burnished depth at the sheared edge of the slug measured without cutting, respectively. For a variety of steel sheets with a range of the tensile strength from 360 to 1500 MPa, linear functions for the estimation were experimentally obtained. The correlation of the estimated tensile strength of the steel sheets with the measured one from the uniaxial tensile test was considerably high, and the correlation of the estimated total elongation was high. The distributions of tensile strength and total elongation for hot- and cold-stamped parts were estimated. The proposed punching test is available under not only a laboratory environment but also a factory environment.

scholarly journals Strength Behaviour of Hot Die Steel with Respect to its Heat Treatment

2020 ◽  
Vol 9 (1) ◽  
pp. 2100-2102
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Tensile Strength ◽  
Tensile Test ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Austenitizing Temperature ◽  
Tempering Temperature ◽  
Die Steel ◽  
The Impact

The surface temperature of hot die steel reaches typically up to 550ºC or above during processes like hot extrusion and casting non-ferrous material. The present paper explores the impact of austenitizing temperature as well as tempering temperature on the tensile strength of hot die steel. Heat treatment is done at three different austenitizing temperatures of 1010ºC, 1030ºC, and 1050ºC, followed by tempering done at two different temperatures of 540ºC and 580°C. Tempering is done twice for two hours. Metallographic grinding, polishing, and then etching using 2% Nital is done to investigate the microstructure of hot die steel with respect to its heat treatment. It is found that the grain size of hot die steel increases with an increase in austenitizing temperature. The impact on tensile strength of hot die steel for its heat treatment is examined by conducting the uniaxial tensile test to fracture. And investigation of the morphology of the fracture surface produced after the tensile test is done. It was found that hot die steel with large grain size exhibits lesser tensile strength. Whereas, the one having smaller grain has higher tensile strength that is found to be in accordance with the Hall-Patch equation

Sign in / Sign up

Export Citation Format

Share Document