Evaluation of Estimation Procedures Used in J-lntegral Testing

Landes, J. D.; Walker, Helen M.; Clarke, GA

doi:10.1520/stp35835s

Cited by 55 publications

(21 citation statements)

References 2 publications

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“…Landes et al [102] showed that Eq. (18) was applicable with reasonable accuracy to ASTM E399 three-point bend and compact specimens with deep cracks, even when the load-line displacement (LLD) was substituted for the actual load-point displacement for the evaluation of A tot .…”

Section: Early J Estimation and G-factor Equationsmentioning

confidence: 99%

“…Since Eq. (21) is complicated in practical application, Landes et al [102] simplified this Merkle-Corten equation in terms of the total displacement as:…”

Section: Early J Estimation and G-factor Equationsmentioning

confidence: 99%

“…(23) indicates that the J-integral for C(T) specimens can be estimated from the energy absorbed by the specimen that is quantified by the total area under the load-displacement curve. Through experimental comparisons, Landes et al [102] concluded that the total energy-based expressions in Eqs. (18) and (23) should be used to estimate J, respectively for three-point bend and compact tension specimens with deep cracks.…”

Section: Early J Estimation and G-factor Equationsmentioning

confidence: 99%

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Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization

Zhu

Joyce

2012

Engineering Fracture Mechanics

609

126

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Stress intensity factor Energy release rate CTOD CTOA J-integral J-R curve K-R curve ASTM standard a b s t r a c tThe present paper gives a technical review of fracture toughness testing, evaluation and standardization for metallic materials in terms of the linear elastic fracture mechanics as well as the elastic-plastic fracture mechanics. This includes the early investigations and recent advances of fracture toughness test methods and practices developed by American Society for Testing and Materials (ASTM). The review describes the most important fracture mechanics parameters: the elastic energy release rate G, the stress intensity factor K, the Jintegral, the crack-tip opening displacement (CTOD) and the crack-tip opening angle (CTOA) from the basic concept, definition, to experimental estimation, test methods and ASTM standardizing practices. Attention is paid to guidelines on how to choose an appropriate fracture parameter to characterize fracture toughness for the material of interest, and how to measure the fracture toughness value defined either at a critical point or in a resistance curve format using laboratory specimens. The relevant ASTM fracture toughness test standards considered in this paper are E399 for K Ic testing, E561 for K-R curve testing, E813 for J Ic testing, E1152 for J-R curve testing, E1737 for J Ic and J-R curve testing, E1290 for CTOD (d) testing, a combined common test standard E1820 for measuring the three parameters of K, J and d, E1921 for the transition reference temperature T 0 testing and the master curve of cleavage toughness K Jc testing, and E2472 for CTOA testing. The effects of loading rate, temperature and crack-tip constraint on fracture toughness as well as fracture instability analysis are also reviewed.

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Section: Early J Estimation and G-factor Equationsmentioning

confidence: 99%

“…Since Eq. (21) is complicated in practical application, Landes et al [102] simplified this Merkle-Corten equation in terms of the total displacement as:…”

Section: Early J Estimation and G-factor Equationsmentioning

confidence: 99%

Section: Early J Estimation and G-factor Equationsmentioning

confidence: 99%

See 1 more Smart Citation

Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization

Zhu

Joyce

2012

Engineering Fracture Mechanics

609

126

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“…Landes and his colleagues ( [18] and [1]) conducted many experiments of large crack extension to determine J-values and the sensitivity of fracture toughness measurements 'to both specimen geometry and different types of specimen loading. Some of their tests were run up to the maximum loads and some have load versus displacement records like the one shown in Figure 1.…”

Section: Literature Reviewmentioning

confidence: 99%

An incremental analysis of plane strain fully plastic crack growth in strain-hardening materials under extension

Zhou

Wierzbicki

1996

Int J Fract

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Analyses of inelastic fracture have mainly followed two directions. One is crack-tip-field analysis in strain-hardening materials (e.g., the HRR solution). The other is whole field analysis in non-hardening materials (e.g., McClintock's slip-line approach). In this paper, a theoretical approach that combines the two directions is presented to account for large crack growth. As an example, plane strain mode I fully plastic crack growth in a single-edge-cracked-specimen under extension is analyzed. The incremental analysis based on the deformed configuration is developed for large crack growth in strain-hardening materials. A kinematically admissible displacement increment field with crack-tip singularity is first constructed in a presumed symmetrical triangular deformation zone extending from the crack tip to the back flank of the ligament (whole field). Then the size of the deformation zone is determined by minimizing the total force in each incremental step. The strain histories of all material points in the ligament are traced and a fracture criterion based on the hole growth theory is applied. The comparisons between the present study and the experiments existing in the literature show the validity of the present approach.

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“…[ 1 1 When conducting crack growth rate tests on a material behaving in a nonlinearly elastic manner, the methods employed to collect the raw test data become even more tedious and complex since parameters other than crack length and elapsed cycles must be measured and recorded. Crack tip opening displacement (CTOD), [21 crack tip opening angle (CTOA), [3] and the area under load vexsus displacement curves [4 ] represent a few examples of data which are collected and analyzed by investigators to obtain nonlinear fracture parameters. The determination of these parameters are again often subject to operator bias and error, besides demanding constant personal supervision.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth Rate Data Acquisition System for Linear and Nonlinear Fracture Mechanics Applications

Horstman

Peters²,

Schindler³

et al. 1981

Journal of Testing and Evaluation

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A computer-based, automated data acquisition system was developed for determining fatigue crack growth rate data for both linear and nonlinear fracture mechanics testing. The system hardware used was a Hewlett Packard (HP) 9825A desktop computer equipped with an HP 6940B multiprogrammer. For linear elastic fracture mechanics (LEFM) testing, the crack growth rate da/dN is presented as a function of the stress intensity factor range ΔK. Compliance relationships are used to monitor crack length which is then used to calculate the stress intensity range. For nonlinear fracture mechanics (NLFM) testing, the crack growth rate is related to the rate of potential energy change, or ΔJ. Compliance techniques are also used to monitor crack extension. The results of both analysis methods obtained with the acquisition system for aluminum alloys 2124-T851 and 7075-T73 (Unified Numbering System [UNS] A92124 and A97075) are in excellent agreement with results obtained using the more conventional visual and analytical methods. The automated system is superior from a point of speed and consistency and possesses the accuracy required for valid crack growth testing. Furthermore, the system requires no personal supervision or special specimen preparation and thus would be available for obtaining fatigue crack growth results from test specimens that are subjected to adverse environments which preclude the use of visual measurements.

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Evaluation of Estimation Procedures Used in J-lntegral Testing

Cited by 55 publications

References 2 publications

Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization

Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization

An incremental analysis of plane strain fully plastic crack growth in strain-hardening materials under extension

Fatigue Crack Growth Rate Data Acquisition System for Linear and Nonlinear Fracture Mechanics Applications

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