Experimental verification to determine fracture toughness from the small punch test using “Local approach”

Matocha, Karel; Hurst, Roger Christopher; Čížek, Petr; Turba, K.; Stevens, Paul

doi:10.1016/j.tafmec.2019.03.015

Cited by 16 publications

(6 citation statements)

References 26 publications

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“…Combined with the finite element method, SPT proves to be a highly efficient method in fracture toughness evaluation. [14][15][16] A further approach to identify the onset of fracture is AE. The AE technique is often reported for uses including mechanical behaviour of materials, structural integrity assessment and structural health monitoring.…”

Section: Made a Comparison Between Spt And Ball Indentation Tests To mentioning

confidence: 99%

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Equivalent biaxial strain evaluation in small punch testing using acoustic emission

Pullin

Jenkins

Cernescu

et al. 2020

The Journal of Strain Analysis for Engineering Design

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The small punch test initially used mainly in the nuclear sector proved to be an efficient method of estimating the mechanical properties of materials, including fracture toughness. In general, the fracture toughness is estimated based on a correlation with equivalent biaxial fracture strain. However, the latter depends on knowing the onset of the unstable fracture. In this article, the acoustic emission technique is used within the small punch test for estimating the unstable fracture initiation and determining the corresponding punch displacement from the load–displacement curve. Although, the acoustic emission signal can be slightly altered due to the location of the sensor, the results confirm the potential of the acoustic emission technique for detecting the onset of the unstable cracking and thus accurately estimating the equivalent biaxial fracture strain. The accumulated energy during the small punch test is one of the relevant acoustic emission parameters in estimating the fracture onset since it can be associated with the accumulated strain energy released by the deformed material.

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Section: Made a Comparison Between Spt And Ball Indentation Tests To mentioning

confidence: 99%

“…Combined with the finite element method, SPT proves to be a highly efficient method in fracture toughness evaluation. 14–16…”

Section: Introductionmentioning

confidence: 99%

Equivalent biaxial strain evaluation in small punch testing using acoustic emission

Pullin

Jenkins

Cernescu

et al. 2020

The Journal of Strain Analysis for Engineering Design

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“…Assuming approximately spherical inclusions (

), the initial porosity is calculated as

, based on the previously given chemical properties of P91. A higher value of

was suggested (

) in [ 26 ] thus in further sections the effect of

on simulation results was investigated by using

and

. Franklin’s formula serves as an estimate for the initial void volume fraction

.…”

Section: Materials Parameters For P91 Steelmentioning

confidence: 99%

Experimental and Computational Study of Ductile Fracture in Small Punch Tests

et al. 2017

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A unified experimental-computational study on ductile fracture initiation and propagation during small punch testing is presented. Tests are carried out at room temperature with unnotched disks of different thicknesses where large-scale yielding prevails. In thinner specimens, the fracture occurs with severe necking under membrane tension, whereas for thicker ones a through thickness shearing mode prevails changing the crack orientation relative to the loading direction. Computational studies involve finite element simulations using a shear modified Gurson-Tvergaard-Needleman porous plasticity model with an integral-type nonlocal formulation. The predicted punch load-displacement curves and deformed profiles are in good agreement with the experimental results.

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“…In 1981, the small punch (SP) technique was proposed for radiation embrittlement studies in the United States. This technique was extensively developed by many researchers to estimate the potential for residual life assessment of components during service [5][6][7][8]. The Charpy impact test was proposed to avoid the disadvantages of traditional CT(Compact Tension) and SENB (Single Edge Notch Beam) samples.…”

Section: Introductionmentioning

confidence: 99%

Calculation and comparison on fracture toughness of specific reliability between ASTM and ISO standards

Zhang

Zhou

et al. 2020

Mater. Res. Express

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Fracture toughness, as a crucial mechanical property, is essential in the research of fatigue crack propagation and fatigue life. Considering the enormous data scatter of the fracture toughness in experiments, a data processing method is proposed to calculate the fracture toughness for the specified reliability. Based on the traditional data processing method shown in the relative standards, the two-dimensional, one-sided tolerance factor is introduced to calculate the influence of the reliability. In addition, by comparing the data processing methods of the fracture toughness presented in the ISO12135:2016 and ASTM E1820-2013 standards, the differences between them were mainly the range of the qualified data, the function of the construction line, and the equation of the regression line. Because the construction lines of the two standards are based on two different material constitutive models, if the constitutive model of material is more aligned with that of the ideal elastic plastic material, the ASTM E1820-2013 standard is recommended; otherwise, the ISO12135:2016 standard is recommended. For 30CrNi2MoVA, the ISO 12135:2016 standard was more suitable, and the error of the J IC obtained by the two standards was about 5%.

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Experimental verification to determine fracture toughness from the small punch test using “Local approach”

Cited by 16 publications

References 26 publications

Equivalent biaxial strain evaluation in small punch testing using acoustic emission

Equivalent biaxial strain evaluation in small punch testing using acoustic emission

Experimental and Computational Study of Ductile Fracture in Small Punch Tests

Calculation and comparison on fracture toughness of specific reliability between ASTM and ISO standards

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