On the applicability of the small punch test to the characterization of the 1CrMoV aged steel: Mechanical testing and numerical analysis

Madia, Mauro; Foletti, S.; Torsello, Giulia; Cammi, A.

doi:10.1016/j.engfailanal.2013.07.028

Cited by 27 publications

(7 citation statements)

References 20 publications

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“…Many of the studies reviewed have utilized FE models to varying degrees in order to acquire results and material correlations. Though some investigations utilize 3D models, such as when accounting for anisotropic material properties, 2D axisymmetric models have been shown to be sufficient for most studies [181,182]. A study using Poly(methyl methacrylate) bone cement by Giddings et al corroborated the findings of previous studies to evaluate the relationship between the initial stiffness of the SPT test and the Young's modulus by varying the value of the modulus and the corresponding set of initial stiffness values [81].…”

Section: Finite Element Analysis Of the Sptmentioning

confidence: 95%

Mechanics of the small punch test: a review and qualification of additive manufacturing materials

Torres

Gordon

2021

J Mater Sci

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The small punch test (SPT) was developed for situations where source material is scarce, costly or otherwise difficult to acquire, and has been used for assessing components with variable, location-dependent material properties. Although lacking standardization, the SPT has been employed to assess material properties and verified using traditional testing. Several methods exist for equating SPT results with traditional stress–strain data. There are, however, areas of weakness, such as fracture and fatigue approaches. This document outlines the history and methodologies of SPT, reviewing the body of contemporary literature and presenting relevant findings and formulations for correlating SPT results with conventional tests. Analysis of literature is extended to evaluating the suitability of the SPT for use with additively manufactured (AM) materials. The suitability of this approach is shown through a parametric study using an approximation of the SPT via FEA, varying material properties as would be seen with varying AM process parameters. Equations describing the relationship between SPT results and conventional testing data are presented. Correlation constants dictating these relationships are determined using an accumulation of data from the literature reviewed here, along with novel experimental data. This includes AM materials to assess the fit of these and provide context for a wider view of the methodology and its interest to materials science and additive manufacturing. A case is made for the continued development of the small punch test, identifying strengths and knowledge gaps, showing need for standardization of this simple yet highly versatile method for expediting studies of material properties and optimization.

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Section: Finite Element Analysis Of the Sptmentioning

confidence: 95%

Mechanics of the small punch test: a review and qualification of additive manufacturing materials

Torres

Gordon

2021

J Mater Sci

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“…Since the punch, die set and the test material exhibit low thermal expansion at this temperature, the thermal expansion of these components is neglected during the SPTT. A Type K thermocouple (6) with a working temperature range of 200 -1250 °C is positioned close to the top surface of the specimen to control and monitor the testing temperature.…”

Section: The Small Punch Tensile Testingmentioning

confidence: 99%

“…The punch load was applied to the disc at a given constant displacement rate. The very small specimen size denotes that the SPTT can be considered as a limited-volume testing method to provide a real life evaluation of mechanical behaviours when compared with the conventional tensile test [5][6][7][8]. Moreover, the SPTT specimen can be taken directly from in-service components without significantly affecting their structural integrity [9], allowing the mechanical behaviour to be examined [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of deformation process and fracture mechanisms of P91 steel at 600 °C in small punch tensile testing

Chen

Yang

Al-Abedy

et al. 2020

Materials Characterization

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This paper investigates the microstructural evolution and fracture mechanism of the P91 steel during small punch tensile tests. Disc specimens, 8 mm in diameter and 0.5 mm in thickness, were tested in a small punch test rig at 600 °C using a constant displacement rate of 2 µm/s.Interrupted small punch tensile tests were performed to investigate the microstructural evolution in different deformation regimes. Deformed specimens were characterised by scanning electron microscopy and electron backscatter diffraction. Microstructure characterisation showed that block boundary alignment occurred in the plastic deformation direction, before achieving the maximum punch load. It was revealed that the martensitic structure was recovered when the tests progressed. The elongation of recovered grains occurred after achieving the maximum punch load. In addition, it was shown that the voids tended to nucleate along the recovered grain boundaries and became elongated to align with the plastic flow within the specimen.

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“…2) and/or load-specimen deflection record, which contains information about the elastic-plastic deformation and strength properties of the material. The load-displacement curves obtained can be utilised to derive empirical correlations between SP and standardised test results [1,[7][8][9][10][11] or they can be analysed in terms of elastic-plastic finite element methods [12][13][14]. Fig.…”

Section: Small Punch Testsmentioning

confidence: 99%

The Effect of Stiffness of the Loading System on Determination of Tensile Characteristics From the Results of Small Punch Tests

Matocha

Kander

Filip

et al. 2014

Acta Metall Slovaca

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The assessment of the residual lifetime of critical components of industrial plants requires the knowledge of mechanical properties prior to operation, respecting all technological operations realized throughout the manufacture of the component, and the knowledge of mechanical properties after actual time of operation (actual mechanical properties). The conventional mechanical tests require relatively large volume of testing material and extracting it from an operating component can impair its integrity. The need for evaluating the actual mechanical properties by direct testing method has led to development of innovative techniques based on miniaturized specimens. Among these, a technique called the Small Punch (SP) test has emerged as a promising candidate. It enables measurement of the realistic material properties at the critical locations in the component both prior and after long-term operation. Yield stress and tensile strength at ambient temperature are determined from empirical correlations between SP and standardized test results. In the present paper the empirical correlations obtained in two laboratories for determination of yield stress and tensile strength of low alloy steel of type 14MoV6-3 in as received state from the results of SP tests are compared and the differences obtained are discussed. The results obtained demonstrate the significance of loading system stiffness on the results of SP tests at laboratory temperature.

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On the applicability of the small punch test to the characterization of the 1CrMoV aged steel: Mechanical testing and numerical analysis

Cited by 27 publications

References 20 publications

Mechanics of the small punch test: a review and qualification of additive manufacturing materials

Mechanics of the small punch test: a review and qualification of additive manufacturing materials

Characterisation of deformation process and fracture mechanisms of P91 steel at 600 °C in small punch tensile testing

The Effect of Stiffness of the Loading System on Determination of Tensile Characteristics From the Results of Small Punch Tests

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