Modelling the small punch tensile behaviour of an aerospace alloy

Lancaster, Robert; Illsley, Henry; Davies, Gareth; Jeffs, Spencer; Baxter, Gavin

doi:10.1080/02670836.2016.1230168

Cited by 22 publications

(14 citation statements)

References 24 publications

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“…The SP curves obtained in this study are qualitatively similar to those reported in the literature for other investigations on EBM AM Ti64 [17][18][19][20], and differ significantly from conventional SP test records for steel specimens, as in the example illustrated in Fig. 2.…”

Section: General Remarkssupporting

confidence: 88%

“…The available literature on the application of various SP testing techniques, including fatigue and creep, to various types of Ti64 (forged, cast, and EBM) [17][18][19][20]41] demonstrates a significant level of interest in the material testing community. Published force-displacement curves of AM specimens [17][18][19][20] are similar to those we obtained in this study. Several references also show significantly lower tensile properties for AM Ti64 with respect to forged and cast material, as inferred from SP tests performed both at ambient and elevated temperatures [17,19,20].…”

Section: Discussionmentioning

confidence: 99%

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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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Section: General Remarkssupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

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

Lucon¹,

Benzing²,

Hrabe³

2020

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“…SP test is possible to apply to evaluation of strength in any aging time and predict the residual life. However, the load in the SP test sample is complex and scattered [6], so that detailed study on SP are required not only in stress distribution but also chemical reaction mechanism furthermore.…”

Section: Resultsmentioning

confidence: 99%

Degradation of PVC insulated cable by Small Punch test considering molecular weight change

2019

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PVC used as insulation material for industrial power cable was tried to evaluate degradation by Small Punch test (SP test) as a simple and easy assessment method. It was suggested that the SP test can analyze chemical changes from the correlation with IR. Qualitative assessment shows agreement between SP test and tensile test, and it is possible to apply to evaluation of strength at long aging times. However, the failure load in the SP test samples is complex and scattered, so that detailed study on SP test is required. Thus, we focused chemical reaction mechanisms and tried to clarify their influence on SP behavior. Molecular weight change was measured for each aging time by SEC and discussed how polymer chains are cut based on IR result. We discuss the relationship between molecular weight and the mechanical properties of PVC by SP test. The effectiveness of SP test as the evaluation method for residual life prediction will be addressed.

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“…Small punch tensile testing induces a complex biaxial stress state in test specimens [21,[30][31][32]. The load-displacement curves obtained from SPT tests typically exhibit up to four distinct bending regions [33], as shown in Figure 2, and there is currently no analytical solution available that allows strain to be calculated from all four bending regions without finite element analysis.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

The influence of microstructure on the ductile to brittle transition and fracture behaviour of HVOF NiCoCrAlY coatings determined via small punch tensile testing

Jackson

Sun

McCartney

2019

Materials Science and Engineering: A

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Modelling the small punch tensile behaviour of an aerospace alloy

Cited by 22 publications

References 24 publications

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

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

Degradation of PVC insulated cable by Small Punch test considering molecular weight change

The influence of microstructure on the ductile to brittle transition and fracture behaviour of HVOF NiCoCrAlY coatings determined via small punch tensile testing

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