Assessment of the constitutive properties from small ball punch test: experiment and modeling

Campitelli, E.N.; Spätig, P.; Bonadé, R.; Hoffelner, Wolfgang; Victoria, M.

doi:10.1016/j.jnucmat.2004.07.052

Cited by 100 publications

(70 citation statements)

References 26 publications

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“…Note that the strain hardening beyond necking was considered constant; this means that the plastic flow curve was linearly extrapolated beyond about 6.5% plastic true strain. This procedure was previously validated with the numerical reconstruction of the load displacement curves of punch tests [17] and notched tensile specimens [18] for instance. In any case it was observed that for C(T) specimens the plastic properties beyond necking do not affect significantly the calculated stress fields and not at all the load displacement curves.…”

Section: Tensile Testsmentioning

confidence: 99%

3D finite element and experimental study of the size requirements for measuring toughness on tempered martensitic steels

Mueller¹,

Spätig²

2009

Journal of Nuclear Materials

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The fracture properties of the tempered martensitic steel Eurofer97, which is among the main candidates for fusion power plant structural applications, were studied with two sizes of pre-cracked compact specimens (0.35T C(T) and 0.87T C(T)). The fracture toughness behavior was characterized within the temperature range -80 to -40 ºC. The ductile-to-brittle transition reference temperature, as defined in the ASTM standard E1921, was around T 0 ≈ -75 ºC. At -60 °C, it was found that two sets of toughness data obtained with 0.35T and 0.87T C(T) specimens are not consistent with the size adjustments recommended in the ASTM standard. It was then shown that the underlying reason of this inconsistency is an inappropriate specimen size limit of the ASTM standard for this type of steel. From published fracture toughness data on the tempered martensitic steel F82H steel, similar results were also highlighted. 3D finite elements simulations of the compact specimens were performed to compare the stresses and deformations at the onset of fracture. A local approach model based on the attainment of a critical stress and a critical volume was used to study the constraint loss phenomenon. Within the framework of this model, the strong toughness increase by reducing the specimen size could be satisfactorily explained.2

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Section: Tensile Testsmentioning

confidence: 99%

3D finite element and experimental study of the size requirements for measuring toughness on tempered martensitic steels

Mueller¹,

Spätig²

2009

Journal of Nuclear Materials

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“…A free-standing extensometer attached to the experimental device was employed to accurately measure the punch displacement. A high stiffness material was previously tested in order to correct the obtained SPT curves eliminating the machine and equipment stiffness [5][6][7]27]. All the tests were carried out at a constant displacement rate of 0.2 mm/min.…”

Section: Fracture Testsmentioning

confidence: 99%

Development of a new methodology for estimating the CTOD of structural steels using the small punch test

García¹,

Rodríguez²,

Belzunce³

et al. 2015

Engineering Failure Analysis

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“…In the world practice, the method of punching SP disk microspecimens is used to determine the characteristics of strength s u , s 0 2 . [2][3][4][5][6][7][8][9] and fracture toughness J c I , K c I [1, 5,8] and also to evaluate the ductile-to-brittle transition temperature [6]. Modification of the Laboratory Testing Machine UTM-20HT to Perform SP-Testing of Disk Microspecimens.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mechanical Behavior of Materials by Small Punch Testing of Miniature Disk Specimens

et al. 2015

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A procedure and experimental equipment are developed to perform small punch testing of miniature disk specimens. The procedure is experimentally tested on specimens of 45 steel. A comparative analysis is made of the known procedures for determining the yield stress from the small punch load-displacement curves for miniature disk specimens.Keywords: small punch testing of miniature disk specimens, stress-strain curve, yield stress. Introduction.The method of small punch testing of miniature disk specimens, known as small punch test (SP-test), is based on the recording of the ball punch deformation of a miniature disk specimen (SP disk microspecimen) rigidly fixed along the perimeter in a special device in the coordinates of the load applied to the ball vs depth of punch indentation in the SP disk microspecimen.This method, in its essence, is similar to the method of instrumented indentation test. The difference is that the latter method refers to the nondestructive test methods, whereas the SP-test method requires special disk-shaped specimens whose geometry and surface roughness have to meet rather severe requirements. It is advisable to use this method if traditional tensile tests according to the standard GOST 1497-84 [10] are impossible because of the necessity of preparing specimens from miniature cut-outs. In the world practice, the method of punching SP disk microspecimens is used to determine the characteristics of strength s u , s 0 2 . [2-9] and fracture toughness J c I , K c

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Assessment of the constitutive properties from small ball punch test: experiment and modeling

Cited by 100 publications

References 26 publications

3D finite element and experimental study of the size requirements for measuring toughness on tempered martensitic steels

3D finite element and experimental study of the size requirements for measuring toughness on tempered martensitic steels

Development of a new methodology for estimating the CTOD of structural steels using the small punch test

Experimental Investigation of Mechanical Behavior of Materials by Small Punch Testing of Miniature Disk Specimens

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