Evaluation of ultimate tensile strength using Miniature Disk Bend Test

Kumar, Kuljit; Pooleery, Arun; Madhusoodanan, K.; Singh, Ranjit; Chakravartty, J.K.; Shriwastaw, R.S.; Dutta, B.K.; Sinha, R.K.

doi:10.1016/j.jnucmat.2015.02.029

Cited by 29 publications

(20 citation statements)

References 15 publications

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“…Many empirical correlations between SP characteristic values and tensile properties have been published in the literature [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], mostly for steels.…”

Section: Correlations With Tensile Propertiesmentioning

confidence: 99%

Development and validation of small punch testing at NIST

Lucon¹,

Benzing²,

Hrabe³

2020

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Small Punch (SP) testing is a methodology that uses tiny disks (generally 8 mm in diameter and 0.5 mm thick) to estimate mechanical properties of metallic materials, such as tensile properties, fracture toughness, and ductile-to-brittle transition temperature. Empirical correlations are typically used to infer conventional mechanical properties from characteristic forces and displacements obtained from the SP test record. At NIST in Boulder, Colorado, we recently developed experimental and analytical procedures for running SP tests on various materials. We conducted SP tests on three steels with widely different tensile and fracture properties. The NIST setup was successfully qualified by comparing our results on A533B steel to the results obtained in an international round-robin, and also by comparing empirical correlations between SP data and tensile properties to similar relationships published in the literature. We also tested specimens with different surface roughness, to investigate the influence of surface finish on SP test results.

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Section: Correlations With Tensile Propertiesmentioning

confidence: 99%

Development and validation of small punch testing at NIST

Lucon¹,

Benzing²,

Hrabe³

2020

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“…The present research was initiated taking into consideration the same fact exposed previously by Kumar et al [15] and followed by Altstadt et al: points prior to the P m are more suitable for the estimation of ultimate tensile strength σ u .…”

Section: Introductionmentioning

confidence: 99%

“…Kumar et al [15] showed in their research that the SPT specimen, in the proximity of the maximum load P m , had initial cracks. Thus, material damage is initiated before reaching the maximum load of the SPT curve.…”

Section: Introductionmentioning

confidence: 99%

A New Prediction Method for the Ultimate Tensile Strength of Steel Alloys with Small Punch Test

2018

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The load–deflection curve acquired from the Small Punch Test (SPT) is used to obtain the mechanical properties of materials using different correlation methods. The scattering level of these regressions tends to be high when a wide set of materials is analyzed. In this study, a correlation method based on a specific slope of the SPT curve was proposed to reduce scattering. Assuming the Ramberg–Osgood hardening law, the dependence of the SPT curve slope on the yield strength and the hardening coefficient is demonstrated by numerical simulations (FEM). Considering that the ultimate tensile strength could be obtained from the hardening coefficient, a response surface of the ultimate tensile strength with the yield strength and SPT curve slope, along with its equation, is presented for steel alloys. A summary of steel mechanical properties, based on the Boiler and Pressure Vessel Code (BPVC) and limited to yield strengths lower than 1300 MPa, is shown to select a set of experimental tests (tensile tests and SPTs) for which the range is completely covered. This experimental analysis validates the previous FEM analyses and the validity of the proposed correlation method, which shows more accurate correlations compared to the current methods.

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“…Small punch specimens are suitable for identifying yield strength and UTS [5], while miniaturized standard specimens are suitable for identifying the whole stress/strain curve including Young's modulus [1]. Small punch specimens are rather standard, with most being either square 10mm x 10mm x 0.5mm [5] or circular with a diameter between 3mm [6] and 10mm [7] and similar thickness to square specimens. The force/displacement curves of these are complicated, with many different regions representing different stages of deformation in the small punch specimen, making the data difficult to interpret.…”

Section: Introductionmentioning

confidence: 99%

The development of a novel small ring specimen tensile testing technique

Kazakeviciute

Rouse

Hyde

2018

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The use of small specimens in routine testing would reduce resource requirements, however, limitations exist due to concerns over size effects, manufacturing difficulties, uncertainties related to the application of representative loading conditions, and complex interpretation procedures of non-standard data. Due to these limitations, small specimen testing techniques have been mostly applied for ranking exercises and to determine approximate or simple material parameters such as Young's modulus, creep minimum strain rate and fracture toughness. The small ring method is a novel, high sensitivity small specimen technique for creep testing and has been extended in the present work for the determination of tensile material properties. Wrought aluminium alloy 7175-T7153 was tested at room temperature at 5 different loading rates. Finite element analysis was completed to evaluate the equivalent gauge section and equivalent gauge length in order to compare uniaxial tensile testing results and small ring specimen tensile testing results. An analytical solution has also been derived in order to validate the finite element analysis. It was discovered that the finite element analysis model was suitable, validated by both experimental results and analytical solution as well as that small ring specimens can be used to acquire same stress/strain data as uniaxial specimens.

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Evaluation of ultimate tensile strength using Miniature Disk Bend Test

Cited by 29 publications

References 15 publications

Development and validation of small punch testing at NIST

Development and validation of small punch testing at NIST

A New Prediction Method for the Ultimate Tensile Strength of Steel Alloys with Small Punch Test

The development of a novel small ring specimen tensile testing technique

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