Relations Between the Notched Beam Impact Test and the Static Tension Test

1944 ◽  
Vol 11 (1) ◽  
pp. A28-A34
Author(s):  
C. W. MacGregor ◽  
J. C. Fisher
Keyword(s):  
Impact Test ◽  
Tension Test ◽  
True Stress ◽  
Static Tension ◽  
Stress Strain ◽  
Impact Tests ◽  
Temperature Conditions ◽  
Tension Tests

Abstract Results of static tension tests of both notched and uniform bars are compared with notched beam impact tests through the use of true stress-strain values. For the materials tested and under the temperature conditions imposed, it was found that the effect of drawing and testing temperatures on the energy absorbed per unit of volume was essentially the same for both static notched tension and notched beam impact tests.

A Constitutive Description of the Yield Strength and Strain Hardening Behaviors of Nano-Twinned Metals

2013 ◽  
Vol 535-536 ◽  
pp. 109-112
Author(s):  
Chong Yang Gao ◽  
W.R. Lu
Keyword(s):  
Experimental Data ◽  
Yield Strength ◽  
Size Effects ◽  
True Stress ◽  
Stress Strain ◽  
Fine Grain ◽  
Tension Tests ◽  
Stress Strain Relation ◽  
Twin Spacing ◽  
Meso Scale

In this paper, a constitutive description of the true stress-strain behaviors of nano-twinned metals has been proposed. The size effects of nano-scale twin boundaries (TBs) and ultra-fine grain boundaries (GBs) are considered in the athermal stress. The evolution of the dislocation density with strain under the influence of strain rate and temperature is introduced in the thermal stress based on our previous meso-scale constitutive model. The new model can effectively describe the strength transition regime in nano-twinned metals. The proposed model’s predictions of true stress-strain relation curves for nano-twinned copper are compared with the experimental results of uniaxial tension tests for validation. The comparisons show that the previous models in literature for the dependence of initial yield strength on twin spacing cannot describe the experimental data correctly when the twin spacing tends to zero; however, the phenomenological model proposed in this paper for the twin spacing depending relation is theoretically rational and can well describe the experimental data in the whole range of twin spacing.

Stress-Stain Response of PVC Geomembrane under Uniaxial Tension Test

2014 ◽  
Vol 936 ◽  
pp. 1582-1586 ◽  
Author(s):  
Hai Min Wu ◽  
Yi Ming Shu
Keyword(s):  
Uniaxial Tension ◽  
True Strain ◽  
Tension Test ◽  
True Stress ◽  
Strain Response ◽  
Test Results ◽  
Stress Strain ◽  
Uniaxial Tension Test ◽  
Engineering Stress ◽  
Photographic Analysis

The mechanical property of polyvinyl chloride (PVC) geomembrane was usually expressed using engineering stress-strain response in traditional uniaxial tension test. By failing to account for deformation of specimen during the test, the deviation of true stress and strain maybe caused from the test results. In this paper, the true stress-strain response of PVC geomembrane was investigated using uniaxial tension test. The photographic analysis method was used to measure axial and lateral true strain of specimen. The Poissons ratio and true stress were also acquired based on measured true strain in the test. Then the true stress-strain relationship was obtained from the test results. By comparing with the engineering stress-strain results expressed by traditional method, it can be found that the engineering stress-strain result is unreasonable. The engineering stress-strain expression easily leads to the underestimation of the true stress.

Tension Tests at Constant True Strain Rates

1945 ◽  
Vol 12 (4) ◽  
pp. A217-A227
Author(s):  
C. W. MacGregor ◽  
J. C. Fisher
Keyword(s):  
Strain Rate ◽  
True Strain ◽  
Testing Temperature ◽  
True Stress ◽  
Strain Rates ◽  
Stress Strain ◽  
True Strain Rate ◽  
Influence Of Temperature ◽  
Tension Tests ◽  
Strain Type

Abstract Tension tests of the true stress-strain type are reported for which the true strain rate is maintained constant throughout each test. Several metals are investigated under testing temperatures ranging from −183 C to 665 C. The influence of temperature and strain velocity on the true stress-strain properties is described. A single variable called the velocity-modified temperature is used to represent the combined influences of true strain rate and testing temperature.

Fatigue Lives of Metals up to Crack Initiation

1977 ◽  
Vol 99 (3) ◽  
pp. 212-214
Author(s):  
Chiaki Ihara ◽  
Akira Tsurui ◽  
Akito Igarashi
Keyword(s):  
Crack Initiation ◽  
Stochastic Model ◽  
Probability Density ◽  
Material Properties ◽  
Probability Density Functions ◽  
Tension Test ◽  
True Stress ◽  
Density Functions ◽  
Stress Strain ◽  
Mean Values

Recently a stochastic model for fatigue of metals has been proposed by two of the present authors. In this paper some parameters adopted in that model are related to the material properties obtained from the static true stress-strain tension test. On this basis, the probability density functions of lives up to crack initiation and their mean values are estimated.

Intertester-Reliabilität des Upper Limb Neural Tension Tests (ULNT) 1

2019 ◽  
Vol 23 (02) ◽  
pp. 75-80
Author(s):  
Beate Schüßler ◽  
Andrea Pfingsten ◽  
Thomas Schöttker-Königer
Keyword(s):  
Upper Limb ◽  
Tension Test ◽  
Tension Tests

ZusammenfassungZur Überprüfung der Nervenleitfähigkeit werden Kraft, Reflexe und Sensibilität getestet. Bei der Untersuchung der Mechanosensitivität eines Nervs kommen neurodynamische Tests zum Einsatz. Der Upper Limb Neural Tension Test (ULNT) 1 bestimmt die Mechanosensitivität des N. medianus.Ziel der Studie war die Untersuchung der Intertester-Reliabilität des ULNT 1 von nicht spezialisierten Physiotherapeuten bei Probanden mit unilateralen Nacken- und/oder Armsymptomen.Die Therapeuten beurteilten binär und metrisch die Kriterien patientenspezifische Symptome, strukturelle Differenzierung und Bewegungsausmaß sowie das Gesamtergebnis bei 33 Patienten mit unilateralen Nacken- und/oder Armsymptomen. Bei den binären Daten bestimmte der Fleiss-Kappa und bei den metrischen Daten der Intraklassen-Korrelationskoeffizient die Reliabilität. Die zusätzlich erstellten Regressionsmodelle sollten den Einfluss der einzelnen Beurteilungskriterien auf die Gesamtentscheidung herausfiltern.Mit Ausnahme der Reproduzierbarkeit patientenspezifischer Symptome scheint die Beurteilung des ULNT 1 durch nicht spezialisierte Therapeuten nur schlecht vergleichbar zu sein. Da die metrische Bewertungsweise die individuellen Schwellenwerte besser darstellt, ist diese der binären vorzuziehen.

Characterization of Hyperelastic (Rubber) Material Using Uniaxial and Biaxial Tension Tests

2012 ◽  
Vol 570 ◽  
pp. 1-7
Author(s):  
Yawar Jamil Adeel ◽  
Ahsan Irshad Muhammad ◽  
Azmat Zeeshan
Keyword(s):  
Shear Test ◽  
Biaxial Tension ◽  
Constitutive Models ◽  
Hyperelastic Material ◽  
Strain Response ◽  
Stress Strain ◽  
Rubber Material ◽  
Tension Tests ◽  
Planar Shear

Hyperelastic material simulation is necessary for proper testing of products functionality in cases where prototype testing is expensive or not possible. Hyperelastic material is nonlinear and more than one stress-strain response of the material is required for its characterization. The study was focused on prediction of hyperelastic behavior of rubber neglecting the viscoelastic and creep effects in rubber. To obtain the stress strain response of rubber, uniaxial and biaxial tension tests were performed. The data obtained from these tests was utilized to find the coefficients of Mooney-Rivlin, Odgen and Arruda Boyce models. Verification of the behavior as predicted by the fitted models was carried out by comparing the experimental data of a planar shear test with its simulation using the same constitutive models.

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