Determination of yield surfaces by notched strip specimens

Baraya, G.L.; Parker, J.D.

doi:10.1016/0020-7403(63)90004-3

Cited by 11 publications

(9 citation statements)

References 8 publications

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“…Third, brittle fracture might occur in the specimen, originating from the stress concentrations at the roots of the notches. This was experimentally observed by Baraya and Parker (1963) in several aluminium alloys (in particular: 24ST and B51SWP). Fracture thereby occurred at right angles with the specimen axis.…”

Section: Figure 3 Fan Of Lines To Aid In Determining ψsupporting

confidence: 56%

“…Second, in materials with significant strain hardening a localized neck may not develop, but instead a diffuse neck forms. This phenomenon pre-empted Baraya and Parker (1963) from testing notched specimens of certain aluminium alloys (2SO and 3SO). Hill (1952) mathematically worked out the conditions under which a localized neck develops in a strain-hardening material.…”

Section: Figure 3 Fan Of Lines To Aid In Determining ψmentioning

confidence: 99%

“…However, for copper this was not the case, a fact which was attributed to anisotropy in the material. Baraya and Parker (1963) conducted tests on notched specimens of half-hard aluminium, varying the angle θ between 55 o and 80 o . They found that, within scatter, µ = ν. Tensile coupon tests at varying angles with the rolling direction showed a variation of up to 2.5% from the average tensile strength, indicating negligible anisotropy.…”

Section: Introductionmentioning

confidence: 99%

“…Hundy and Green estimated the accuracy of their method at 0.5 o . Baraya and Parker (1963) noted that errors result from the scribed lines not being perfectly straight and uniform in thickness and fine-tuned the technique further. They first scribed the fan of lines on a coated glass plate using a diamond scriber on a jig borer.…”

Section: Introductionmentioning

confidence: 99%

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Notched Strip Tensile Tests to Determine Yield Characteristics of Stainless Steel

et al. 2014

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The paper investigates the use of notched strip tensile tests, originally proposed by R. Hill, to determine the yield characteristics of stainless steel. The original concept is thereby improved in two important ways. First of all, digital image correlation techniques are used to allow an accurate measurement of strain rates in a very localized area. Second, new theoretical developments are presented, which eliminate the need for measuring the applied load and which allow the yield surface of an anisotropic material to be determined starting from a parameterized equation. An experimental program is described where the method has been successfully applied to a ferritic grade as well as an austenitic grade stainless steel. As a disadvantage, a relatively large scatter in test results appears to be intrinsic to the method of notched strip tests.

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Section: Figure 3 Fan Of Lines To Aid In Determining ψsupporting

confidence: 56%

Section: Figure 3 Fan Of Lines To Aid In Determining ψmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Notched Strip Tensile Tests to Determine Yield Characteristics of Stainless Steel

et al. 2014

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“…Anal.,70 (1979):[61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77]. -"A model for an elastic-plastic body."…”

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confidence: 99%

Mechanical Behavior of Anisotropic Solids / Comportment Méchanique des Solides Anisotropes

Boehler¹

1982

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A.SAWCZUK Polish Academy of SciencesPre/ace Sur Ie Comportement Mecanique des Solides Anisotropes Le comportement mecanique des solides presente sou vent un caracrere anisotrope, c'est-a-dire une variation de Ia reponse mecanique suivant l'orientation des sollicitations ex terieu res. L 'origine de i'anisotropie mecanique reside dans Ie caractere oriente de Ia structure interne des materiaux, dl1 aux modes de formation ou aux procedes de fabrication (anisotropie initiale): metaux lamines et files, alliages et eutectiques orientes, composites fibreux ou lamellaires, roches stratifiees, argiles consolidees, sables compactes, bois, tissus biologiques (os), etc. Lorsqu 'un materiau solide subit des dejormations plastiques irreversibles, la structure interne evolue jusqu a Ia rupture (reorientation des particules et des axes cristallographiques, glissements internes orientes, formation de fissures et de cavites orientees, etc.). Ces modifications de Ia structure microscopique provoquent une evolution de l'anisotropie des proprietes mecaniques macroscopiques (anistropie induite). Les proprietes mecaniques des solides anisotropes jouent un role important dans Ia Merallurgie, Ia Science de 11ngenieur, Ie Genie Civil et Ia Geologie. Une bonne comprehension, une description et une mesure appropriees de Ia njponse directionnelle des solides soumis d des sollicitations mecaniques, thermiques, electriques ou autres sont d'une importance vitale dans differentes branches de Ia technologie et concernent en generalles problemes de Ia Science de I1ngenieur dans les objectifs de la societe contemporaine. A titre d'exemples, on peut citer deux applications liees d des soucis de qualite des produits et d'economie de matieres premieres et d 'energie: optimisation des procedes de fabrication pour obtenir des materiaux presentant des caracteristiques mecaniques adaptees; optimisation de la tenue des structures soumises a des conditions d'utilisation severes. L 'utilite pratique du developpement des connaissances dans Ie domaine du comportement des solides anisotropes concerne des secteurs tres diversifies, comme Ia metallurgie, Ia mecanique de i'ingenieur, Ia construction navale, aeronautique et nucleaire, Ie developpement des materiaux composites et renforces, Ia geologie, Ia construction de tunnels et de zones de stockage sous-terrains, Ia prevention des avalanches, Ia sismologie, etc. Les etudes du comportement plastiflue des solides anisotropes peuvent etre regroupees suivant quatre axes: 1) tester, evaluer et decrire d 'une maniere XIV objective les proprietes mecaniques des materiaux anisotropes .. 2) synthetiser Ie comportement materiel dans des modeles mathematiques adequats, prenant en compte les effets des grandes deformations irreversibles .. 3) developper des methodes appropriees pour la resolution des problemes aux limites .. 4) resoudre des problemes specifiques concernant la deformabilite, la fissuration et la rupture, en vue de la mise en a?uvre de procedes technologiques adaptes et de la construction de structures optim...

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Determining the Yield Surface of a Metal Using Notched Strip Specimens: Geometry Optimization

Morales

Becque

2021

ce papers

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Determining the full yield surface of a metal by experimental means is a rather complex task, due to the need to subject the material to a multi‐axial stress state that includes shear. However, an interesting concept (originally credited to Hill and Bijlaard) has been proposed, whereby metal strips with oblique notches are loaded in uniaxial tension. This specific shape forces a narrow yield neck to develop between the roots of the notches, subject to multiaxial straining. The presented research aimed to further develop and optimize this concept. It was previously suspected that the geometry of the test specimens has a potentially significant effect on the results of the experiment. By means of the finite element method, a parametric study was completed to evaluate which geometric variables have the largest influence on the results and to determine the range within which these parameters yield reliable results. It was discovered that certain variables, such as the width of the neck and the radius of the notch root, had a significant impact on the results, whereas others, such as the neck angle or the opening angle of the notch, had very little or even no influence at all. Based on these results, a specific geometry was proposed for the test specimens, as a first step towards a standardized test procedure.

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Determination of yield surfaces by notched strip specimens

Cited by 11 publications

References 8 publications

Notched Strip Tensile Tests to Determine Yield Characteristics of Stainless Steel

Notched Strip Tensile Tests to Determine Yield Characteristics of Stainless Steel

Mechanical Behavior of Anisotropic Solids / Comportment Méchanique des Solides Anisotropes

Determining the Yield Surface of a Metal Using Notched Strip Specimens: Geometry Optimization

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