Elastic-Plastic Fracture

Landes, J. D.; Begley, James A.; Clarke, GA; Kobayashi, A. S.

doi:10.1115/1.3153625

Cited by 63 publications

(4 citation statements)

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“…The fracture behavior in the AISI 403(mod) showed a large scatter in the J values for the QT material is usual in case when the test temperature is in the DBTT range. The origins of the large scatter can be understood from the hypothesis advanced by Begely and Landes [8] which invokes weakest link statistical model of brittle fracture and considers the relative sampling size of test specimens. This large scatter in toughness value may give rise to considerable uncertainty in any structural defect tolerance analysis which demands that a lower bound value to be adopted for structural integrity analysis.…”

Section: Discussionmentioning

confidence: 99%

“…Samples thicker than 12.5 mm failed essentially in a catastrophic manner. For the catastrophic failed samples Landes and Begley [8] suggested determination of J IC from a single test record by computing the area under the load displacement record upto the maximum load. The J IC values obtained were in the range 80-100 kJ/m 2 and 60-120 kJ/m 2 for 25 mm and 12.5 mm thick samples respectively.…”

Section: A Century Of Stainless Steelsmentioning

confidence: 99%

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Deformation and Fracture Behavior of AISI 403 Stainless Steel for Nuclear Structural Applications

Gupta

Chakravartty

Singh

2013

AMR

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The deformation and fracture behaviour of AISI 403, a tempered martensitic stainless steel for end fitting application of Pressurised heavy water reactor is being reported. The deformation behaviour studies entailed characterisation of tensile behaviour in the temperature range 77 - 873 K for the as recieved and the fine grained Nb modified variant of AISI 403. the study of elevated tensile behaviour in the two steels has been undertaken with the purpose of characterising the strain rate - temperature domain of the occurrence of dynamic strain aging (DSA) phenomenon. In both steels, while the temperature range for the manifestations of characteristic anomalies in the tensile curve due to DSA was observed within 523 - 673K, the strain domain for the fine grained Nb modfied variety was significantly higher as comapred with the as recievied variety. The low temperature tensile tests for the as recieved AISI 403 revealed the presence of Pseudo=alloy softening in the temperature range 273 - 193 K. The effect of high DBTT of the AISI 403 steel was shown by the fracture toughness tests in the J-integral format at room temperature that displayed significant scatter in smaples with high in-plane and out of plane constraint. Smaples with lower constraint showing stable crack growth were further tested at high temperature to obtain the temperature dependence of initiation fracture toughness and propagation touhgness. Within the DSA tempertaures a sharp decline in the fracture properties were observed. A mechanistic interpretation for the manifestations of the various observed phenomena is presented.

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Section: Discussionmentioning

confidence: 99%

Section: A Century Of Stainless Steelsmentioning

confidence: 99%

Deformation and Fracture Behavior of AISI 403 Stainless Steel for Nuclear Structural Applications

Gupta

Chakravartty

Singh

2013

AMR

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“…Walnut shell was difficult to meet the size requirements of K IC test for its thinner shell. Therefore, toughness of walnut shell was measured based on the multiple specimen J-integral tests, [27] (Figure 3a, e; Figure .S3d,e, Supporting Information). In the linear elastic range, the J IC and K IC are interchangeable:…”

Section: Methodsmentioning

confidence: 99%

Fracture Resistance Biomechanisms of Walnut Shell with High‐Strength and Toughening

Wang

Yin

et al. 2023

Advanced Science

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Walnut shell is lightweight material with high‐strength and toughening characteristics, but it is different from other nut shells’ microstructure with two or three short sclerotic cell layers and long bundle fibers. It is essential to explore the fracture resistance biomechanism of lightweight walnut shell and how to prevent damage of bionic structure. In this study, it is found that the asymmetric mass center and geometric center dissipated impact energy to the whole shell without loading concentration in the loading area. Diaphragma juglandis is a special structure improved walnut shell's toughening. The S‐shape gradient porosity/elastic modulus distribution combined with pits on single auxetic sclerotic cells requires higher energy to crack expansion, then decreases its fracture behavior. These fantastic findings inspire to design fracture resistance devices including helmets, armor, automobile anti‐collision beams, and re‐entry capsule in spacecraft.

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“…Most importantly in Low Cycle Fatigue (LCF) and Thermomechanical Fatigue (TMF) where is has been shown that non-uniform crack growth can be prevalent and the measurement of these can be difficult. [8] Quite often efforts are made to stop tunnelling occurring in the test, by modified specimen geometries [9], interrupting the test to put different loading on the sample which has been shown to return the crack to a uniform shape or post processing to try to understand the stress intensity factor [10]. Current work however is not being undertaken in live crack growth experiments, efforts are concentrating on characterising response using a range of samples with known shape.…”

Section: Introductionmentioning

confidence: 99%

Development of a technique for the real-time determination of crack geometries in laboratory samples

et al. 2018

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Abstract.Crack size determination using electrical potentials both in service and in the laboratory has been undertaken for many years. In the laboratory this has mainly concentrated on the measurement of crack depth, with either alternating current (AC) or direct current (DC) supplies. Some work to determine the varying depth along the width of cracks as an inspection tool of in service parts using mapping methods has been done. This has used both AC and DC utilising various models to understand the data recorded, in Alternating Current Potential Drop (ACPD) a range of frequencies have been used to give various skin depths.The resulting analyses have been grouped into two groups 'thin skin' and 'thick skin', in the thin skin case the skin depth is significantly smaller than the depth of the crack 1/10th of the crack depth whereas in the thick skin cases are for cases where skin depth is over this limit. Some work has been carried out to try and unify these two approaches.The work presented here looks to develop a method using variable frequency ACPD to resolve further information about cracks growing in laboratory specimens. A system has been developed to rapidly sweep a wide frequency band and record voltage drop across a crack or feature. A selection of steel samples with known geometries and features have been used to trial and benchmark the technique. These samples have a range of cross sections as well as machined features or a range of shapes and sizes to simulate a range of crack geometries. This work has been approximated using a 2D computational model. This has been done using a reduced thickness approach. 165, 09004 (2018) MATEC Web of Conferences

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Elastic-Plastic Fracture

Cited by 63 publications

References 0 publications

Deformation and Fracture Behavior of AISI 403 Stainless Steel for Nuclear Structural Applications

Deformation and Fracture Behavior of AISI 403 Stainless Steel for Nuclear Structural Applications

Fracture Resistance Biomechanisms of Walnut Shell with High‐Strength and Toughening

Development of a technique for the real-time determination of crack geometries in laboratory samples

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