Development of an improved correlation method for the yield strength of steel alloys in the small punch test

Calaf-Chica, José; Díez, Pedro Miguel Bravo; Calzada, Mónica Preciado

doi:10.5334/uproc.12

Cited by 3 publications

(5 citation statements)

References 11 publications

(13 reference statements)

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“…The fitting coefficients in Eq. 17 can be compared with the values 47.41 and 1.736 × 10 -4 published in [24].…”

Section: Yield Strength Correlationsmentioning

confidence: 94%

“…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%

“…Finally, Chica et al [24] proposed an exponential correlation between Rp0.2 and the slope of the initial linear portion of the SP test record, Slopeini, normalized by h0. For our tests on polished specimens (see Annex 3 for rough specimen data), we obtained:…”

Section: Yield Strength Correlationsmentioning

confidence: 99%

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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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“…The fitting coefficients in Eq. 17 can be compared with the values 47.41 and 1.736 × 10 -4 published in [24].…”

Section: Yield Strength Correlationsmentioning

confidence: 94%

Section: Correlations With Tensile Propertiesmentioning

confidence: 99%

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Development and validation of small punch testing at NIST

Lucon¹,

Benzing²,

Hrabe³

2020

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“…-Fh0/10,off, normalized by ℎ 0 2 [23]; -F0.1mm,off, normalized by ℎ 0 2 [22,24]; -Slopeini, normalized by h0 [28].…”

Section: Correlations With Tensile Propertiesmentioning

confidence: 99%

“…-Finfl, normalized by h0•um [27]; -F0.48mm [27], F0.645mm [25], and F0.65mm [28], all normalized by ℎ 0 2 .…”

Section: Correlations With Tensile Propertiesmentioning

confidence: 99%

Small punch testing to estimate mechanical properties of additively manufactured Ti-6Al-4V

Lucon¹,

Benzing²,

Hrabe³

2020

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Small Punch (SP) testing is a methodology that uses small disk-shaped specimens, 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 test record. Most of the available literature relates to SP testing of steels, while relatively little information is available for other metallic materials. At NIST in Boulder, Colorado, SP tests were conducted on additively manufactured (AM) Ti-6Al-4V with different processing parameters and heat treatment conditions. The shape of force/punch displacement curves appeared different than typically reported for conventionally manufactured steels, and correlations with tensile parameters were generally weaker than those published for steel samples. We are led to conclude that the application of the SP technique, characterized by a biaxial loading mode, to materials with high anisotropy, such as current batches of AM Ti-6Al-4V, may be somewhat problematic and therefore of limited applicability. Finally, the use of actuator displacement instead of punch displacement in test analyses appeared to cause a generalized worsening of the correlations.

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