Effect of gauge length in superplastic tensile tests

Bate, Pete S.; Ridley, N.; Sotoudeh, Kasra

doi:10.1179/174328408x323113

Cited by 18 publications

(15 citation statements)

References 10 publications

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“…This could be attributed to the higher material flow to gauge length ratio, since the latter means an effectively wider gauge. Although the effect is small here, it agrees with the results presented by Bate et al [13], where specimens with smaller gauge length were shown to exhibit higher stress/strain curves. The three specimen geometries they considered showed more prominent disparities mainly because of their low gauge length to width ratio (1, 2 and 4), which meant high Fig.…”

Section: Combined Effects Of Gauge Length/widthsupporting

confidence: 93%

“…Their efforts concluded with an improved geometry that provides a constant strain rate in a major portion of the specimen's gauge. Bate et al [13], on the other hand, explored the geometry's impact on deformation homogeneity and stress/ strain curves, considering three AA5083 specimens with different gauge length-to-width ratios. They proposed a correction to stress/strain curves as a means to overcome the geometry's effects, particularly the associated material flow issue.…”

Section: Introductionmentioning

confidence: 99%

“…This could be a major source of errors in the captured stress/strain behaviour [11,12], hence indicating the great potentials for unaccounted for effects by the specimen geometry that require investigation. At least, it is likely to challenge the accuracy of claims of extreme superplastic elongations, particularly those exceeding 5000% [13]. Unhappily, the three standards on tensile testing of superplastic materials (JIS H 7501, ASTM E2448 and BS ISO 20032) do not address this issue adequately [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimum Specimen Geometry for Accurate Tensile Testing of Superplastic Metallic Materials

2010

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The high temperatures and large strain limits associated with superplastic materials amplify the possibility of the tensile test outcomes being sensitive to the shape and size of the specimen geometry. In spite of that, the disparities in the specimen geometries used throughout the numerous efforts on characterising this unique class of materials are rather astonishing. There is an urge to evaluate the dependency of a superplastic tensile test on specimen geometry, before a much-needed universally-adopted standard specimen can be designed; which is the main objective of this comprehensive experimental investigation. More than 20 geometries, covering multiple variations in gauge length, gauge width, grip length and grip width values, are tested at identical conditions, and the corresponding material behaviour is compared in terms of deformation uniformity, material flow and the extracted stress/strain curves. The results reveal the influences of each geometrical parameter, as well as their combined effects, and guide the selection of an optimum specimen geometry for accurate and unified tensile testing of superplastic metallic materials.

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Section: Combined Effects Of Gauge Length/widthsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimum Specimen Geometry for Accurate Tensile Testing of Superplastic Metallic Materials

2010

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“…Specimen dimensions also influence the tensile strength and ductility of the material. As the gauge length increased, it reduced the effect of localised deformation at necking on total elongation; i.e., by increasing the gauge length percentage elongation of the specimen is further reduced [35]. The strain-hardening capacity of material also has impacts on the percentage elongation.…”

Section: Tensile Propertiesmentioning

confidence: 97%

“…The research found the significant increase in tensile and yield strengths of the material whereas a decrease in the ductility [34]. The mechanical properties of superplastic materials were investigated on superplastic Al-4·5Mg alloy with different gauge lengths and elongation was found to increase to double when gauge length to width ratio reduced 4 to 1 [35]. The ultimate tensile and yield strengths of steel weld metals decreased but the impact strength of weld metals increased by Ni additions in a controlled manner with respect to Mn .…”

Section: Tensile Propertiesmentioning

confidence: 99%

Investigation of micro-structure and mechanical properties of three steel alloys

Jha¹

2017

Int. J. Automot. Mech. Eng.

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The significant demands of steel in industrial applications and automotive and building industries are increasing. Thus, there is a need for the improvement of its mechanical properties by adding suitable alloy elements to them so that they have more strengthweight ratio. The objective of this research is to study the effect of adding various alloys to steel material and their effects on tensile and impact strengths, hardness, and microstructure. The tensile test was conducted on a round bar standard specimens of three kinds of steel having different compositions to investigate their mechanical properties. The results of tensile tests are given in tables, based on their stress-strain curves plotted to facilitate the design engineer to know the strength and accordingly design lightweight structures from this material. After the test, the microstructure of the fracture surface was observed using an inverted microscope. The tensile and impact strengths and hardness of carbon steel, EN 8 steel, and mild steel were evaluated and compared based on the chemical composition and microstructural observation. The experimental result showed that the increasing percentage of carbon and silicon in EN 8 steel increased its ultimate tensile and yielded strengths but reduced the percentage elongation compared to carbon steel. Similarly, less content of manganese with an increased content of nickel enhanced the impact strength of the mild steel but slightly reduced the tensile strength and hardness of mild steel compared to EN 8 steel.

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Finite Element Simulations for Investigating the Effects of Specimen Geometry in Superplastic Tensile Tests

Nazzal

Abu-Farha

Curtis

2010

J. of Materi Eng and Perform

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Characterizing the behavior of superplastic materials is largely based on the uniaxial tensile test; yet the unique nature of these materials requires a particularly tailored testing methodology, different to that used with conventional materials. One of the crucial testing facets is the specimen geometry, which has a great impact on the outcome of a superplastic tensile test, as a result of the associated extreme conditions. And while researchers agree that it should take a notably different form than the typical dog-bone shape; there is no universal agreement on the specimenÕs particular size and dimensions, as evident by the disparities in test specimens used in the various superplastic testing efforts found throughout the literature. In view of that, this article is dedicated to understanding the effects of specimen geometry on the superplastic behavior of the material during tensile testing. Deformation of the Ti6Al4V titanium alloy is FE simulated based on a multitude of specimen geometries, covering a wide range of gauge length, gauge width, grip length, and grip width values. The study provides key insights on the influences of each geometrical parameter as well as their interactions, and provides recommendations on selecting the specimenÕs proportions for accurate and unified tensile testing of superplastic materials.

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Effect of gauge length in superplastic tensile tests

Cited by 18 publications

References 10 publications

Optimum Specimen Geometry for Accurate Tensile Testing of Superplastic Metallic Materials

Optimum Specimen Geometry for Accurate Tensile Testing of Superplastic Metallic Materials

Investigation of micro-structure and mechanical properties of three steel alloys

Finite Element Simulations for Investigating the Effects of Specimen Geometry in Superplastic Tensile Tests

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