Evaluation of the<i>J</i>Integral for the Compact Specimen

Horstman, RT; Lieb, KC; Power, B; Meltzer, RL; Vieth, MB; Clarke, GA; Landes, J. D.

doi:10.1520/jte10222j

Cited by 127 publications

(4 citation statements)

References 10 publications

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“…where J el and J pl are the elastic and plastic component of the J-integral, respectively; K is the stress-intensity factor, which represents the magnitude of the ideal crack-tip stress field (stress-field singularity) for a particular mode in a homogeneous, linear elastic body; ν and E is Poisson's ratio and the elastic modulus, respectively; A pl is the plastic area under the load-displacement curve; η pl is the geometry factor, dependent on a/W. For the compact specimen, Clarke and Landes obtained an approximate fitted function of η pl (= 2 + 0.522b 0 /W) [44]. B N is the net specimen thickness.…”

Section: Fracture Mechanics Testmentioning

confidence: 99%

Tensile and Fracture Characteristics of 304L Stainless Steel at Cryogenic Temperatures for Liquid Hydrogen Service

Kim,

Lee,

Park

et al. 2023

Metals

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As the urgency for carbon-neutral fuels grows in response to global warming and environmental pollution, liquid hydrogen, with its high energy density, emerges as a promising candidate. Stored at temperatures below 20 K, liquid hydrogen’s containment system requires materials resilient to such cryogenic temperatures. Austenitic stainless steel, including 304L grade, has been widely used due to its favorable properties. However, designing pressure vessels for these systems necessitates a deep understanding of fracture mechanics and accurate assessments of the material’s fracture toughness at cryogenic temperatures. The mechanical behavior at these temperatures differs significantly from that at room temperature, making testing at 20 K a complex procedure that requires stringent facilities. This study examines the tensile behavior and fracture toughness of 304L stainless steel at cryogenic temperatures, comparing and analyzing the characteristics observed at 20 K with those at room temperature. The phenomenon of discontinuous yield, with abrupt stress drops and stepwise deformation at low temperatures, has been identified, resulting in more complex stress–strain curves. Limitations were found in the calculation of the crack length during the assessment of fracture toughness in stainless steel under extremely low-temperature environments through the J-integral compliance method. To address these constraints, a comparative analysis was carried out to determine potential corrective measures.

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Section: Fracture Mechanics Testmentioning

confidence: 99%

Tensile and Fracture Characteristics of 304L Stainless Steel at Cryogenic Temperatures for Liquid Hydrogen Service

Kim,

Lee,

Park

et al. 2023

Metals

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“…For compact tension (CT) specimens, ASTM has adopted an expression (eqn. 1) as obtained by Landes and Clarke [1].…”

Section: Introductionmentioning

confidence: 98%

Limit load based evaluation of plastic η factor for C(T) specimen with a mismatched weld

Nikhil

Krishnan

Sasikala

et al. 2019

Frattura Ed Integrità Strutturale

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Plastic η factor is adopted to account for crack tip plasticity while evaluating the fracture toughness of the materials as per ASTM E1820. It is valid only for homogeneous materials. The plastic η factor for Compact Type (C(T)) geometry with type 316LN stainless steel weld has been evaluated based on elastic-plastic FE analysis. The incremental elastic-plastic material model with various values for strength mismatch ratio (M) i.e. ratio of yield strength of weld metal to that of base metal, from 1.2 to 2.2 have been considered. The weld width (h) parallel to the crack plane is varied from 4 mm to 16 mm. The η values thus obtained are analyzed and the inferences are discussed.

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“…For example, in [6][7][8], various researchers used the C(T) specimen to assess the cracking phenomena and fracture toughness of various materials. In scientific papers [9][10][11], the development of research methods, as well as the need for calibration used in experimental designs, were discussed by authors to define the method of determining critical fracture toughness values based on C(T) specimens. In [12] presented in 2012, Zhu and Joyce discussed an overview of methods for determining fracture toughness using the C(T) and SEN(B) specimens, alongside the C(T) geometry, indicating the need to consider the influence of geometric constraints in formulas approximating the equations of the J-R curves.…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Selected Triaxiality Measures of the Stresses for a C(T) Specimen Dominated by the Plane Strain State

Graba

2020

International Journal of Applied Mechanics and Engineering

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The paper presents a comprehensive analysis of the stress field and selected triaxiality parameters near the crack tip for C(T) specimen dominated by the plane strain state using the finite element method. It includes some theoretical information about elastic-plastic fracture mechanics, the basics of the FEM modeling and presentation of the numerical results. The FEM analysis includes calculations with large strain assumptions. The influence of the external load and crack length is discussed. Additional elements of the paper are a qualitative assessment of the size of plastic zones and the crack tip opening displacement.

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Evaluation of theJIntegral for the Compact Specimen

Cited by 127 publications

References 10 publications

Tensile and Fracture Characteristics of 304L Stainless Steel at Cryogenic Temperatures for Liquid Hydrogen Service

Tensile and Fracture Characteristics of 304L Stainless Steel at Cryogenic Temperatures for Liquid Hydrogen Service

Limit load based evaluation of plastic η factor for C(T) specimen with a mismatched weld

The Characteristics of Selected Triaxiality Measures of the Stresses for a C(T) Specimen Dominated by the Plane Strain State

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