On the estimation of ultimate tensile stress from small punch testing

Altstadt, E.; Houška, M.; Simonovski, Igor; Bruchhausen, Matthias; Holmström, Stefan; Lacalle, R.

doi:10.1016/j.ijmecsci.2017.12.016

Cited by 78 publications

(54 citation statements)

References 29 publications

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“…It is associated with the onset of plastic instability. The correlation factor βRm has also been determined numerically and verified experimentally for a number of F/M steels [26]. Its values for the geometry and the two types of specimen in the standard are reproduced in Table 3.…”

Section: Estimation Of Proof Stressmentioning

confidence: 98%

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European standard on small punch testing of metallic materials

Bruchhausen

Altstadt

Austin

et al. 2018

Ubiquity Proceedings

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In the 1980s, studying the effect of neutron irradiation and temper embrittlement on structural materials for the fusion and fission programmes was a major challenge. In this context the development of small specimen test techniques began, allowing the characterization of structural materials for nuclear applications with small amounts of material. The small punch technique is of one these small specimen test approaches. It is widely used for the development and monitoring of structural materials, however there is currently no comprehensive international standard for small punch testing. An EN standard on small punch testing is currently being developed under the auspices of ECISS/TC101/WG1. Besides describing the apparatus, procedures, and specimens, it will include recommendations for the estimation of tensile, fracture and creep properties from small punch testing as well as machine readable formats for representing and transferring test data.This paper describes the current status of the standard and highlights some of the changes with regard to the current CWA 15672 (2007).

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Section: Estimation Of Proof Stressmentioning

confidence: 98%

“…The location ui has been determined numerically and is largely independent from the tensile material properties [26]. It is associated with the onset of plastic instability.…”

Section: Estimation Of Proof Stressmentioning

confidence: 99%

European standard on small punch testing of metallic materials

Bruchhausen

Altstadt

Austin

et al. 2018

Ubiquity Proceedings

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“…The small punch (SP) test has long been accepted as a method to estimate mechanical properties from small quantities of materials. In particular the ductile to brittle transition temperature, the yield stress, the ultimate tensile stress and creep strength can be extracted for homogeneous and isotropic metals [11][12][13][14][15][16][17][18][19]. The SP test is not intended to replace conventional tests such as tensile tests, Charpy impact tests or fracture mechanical testing, but to be used as screening procedure [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of anisotropic microstructure of ODS steels on small punch test results

Altstadt

Houška

Das

2018

Ubiquity Proceedings

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How to cite:Altstadt, E., Houska, M. & Das, A. 2018. Effect of anisotropic microstructure of ODS steels on small punch test results. Ubiquity Proceedings, 1(S1): 4Abstract: Oxide dispersed strengthened (ODS) steels can exhibit a strongly anisotropic microstructure leading to anisotropic mechanical properties. The ductile to brittle transition temperature in the small punch (SP) test is therefore dependent on the specimen orientation. Three ODS steels with 13-14 mass percent Cr, manufactured through hot extrusion and hot rolling respectively, were investigated by means of SPT in different orientations. Existing microstructural data (EBSD) are used to discuss the anisotropic fracture behavior observed in the SPT. In addition, the SPT results are compared with those from existing fracture mechanics tests based on sub-sized C(T) samples. The applicability of the empirical conversion of SPT based transition temperatures into Charpy transition temperatureswell established for isotropic homogeneous metalsis investigated for materials with anisotropic microstructure.

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“…Based on these previous considerations, Altstadt et al [17] proposed an alternative parameter obtained from the SPT curve: the F i load. This data was the force at a fixed punch displacement of 0.645 mm.…”

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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On the estimation of ultimate tensile stress from small punch testing

Cited by 78 publications

References 29 publications

European standard on small punch testing of metallic materials

European standard on small punch testing of metallic materials

Effect of anisotropic microstructure of ODS steels on small punch test results

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

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