The effect of notch radius on fracture toughness JIc

Akourri, O.; Louah, M.; Kifani, A.; Gilgert, G.; Pluvinage, G.

doi:10.1016/s0013-7944(99)00109-5

Cited by 59 publications

(29 citation statements)

References 6 publications

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“…Indeed, as already found by many authors [41][42][43][44][45][46][47][48][49][50][51][52][53], the fracture toughness is independent of q when q is smaller than a critical notch radius q eff , up to which a blunt notch has the same effect of a crack, and is linearly related to q for q > q eff . A linear square fit, including the origin, was then used to account for the dependence of J c on q.…”

Section: Resultssupporting

confidence: 55%

“…In particular q eff was found to be equal to the mean interspacing distance between major non metallic inclusions for steels failing by ductile microvoid nucleation and coalescence [46,47] or to the mean grain size in the case of brittle intergranular fracture [42,43]. Akourri et al [51] found that q eff is approximately equal to the size of the process fracture zone.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Notch ductility of steels for automotive components

Faccoli¹,

Cornacchia²,

Gelfi³

et al. 2014

Engineering Fracture Mechanics

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Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Notch ductility of steels for automotive components

Faccoli¹,

Cornacchia²,

Gelfi³

et al. 2014

Engineering Fracture Mechanics

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“…Fatigue pre-cracking is not applied. This would complicate the control of the initial crack depth and is not required for sufficiently ductile materials [12,18,19]. Due to the difference in constraint at mid-thickness (towards plane strain) and at the sides (plane stress) of the specimen, crack tunneling is expected [20].…”

Section: Test Specimensmentioning

confidence: 99%

Single-specimen evaluation of tearing resistance in SENT testing

Verstraete

Waele

Minnebruggen

et al. 2015

Engineering Fracture Mechanics

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Please cite this article as: Verstraete, M.A., De Waele, W., Van Minnebruggen, K., Hertelé, S., Single-specimen evaluation of tearing resistance in SENT testing, Engineering Fracture Mechanics (2015), doi: http://dx.doi.org/ 10. 1016/j.engfracmech.2015.07.067 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract The evaluation of CTOD tearing resistance is required by several strain based defect assessment procedures. To that extent, the use of SENT testing is widely advised as the constraint matches that of pressurized pipes. This indicates the need for well validated testing methods. This paper discusses two single specimen techniques for the evaluation of tearing resistance using clamped SENT specimens: the unloading compliance (UC) and the direct current potential drop (DCPD) technique. From the results of tests carried out on a variety of both base metal and welded specimens, both methods show a comparable accuracy and scatter. Single-specimen evaluation of tearing resistance in SENT testing

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“…The relati ve stress gradient (equation 9) has been plotted on the same graph in order to obtain the effective distance exactly. For a fracture load equal to 13.1 KN, the effective distance has been found to be equal to X er = 0,380 mm [4].…”

Section: Local Stress Criterion For Fracture Emanating From Notchmentioning

confidence: 99%

Notch Effects in Fatigue and Fracture

Pluvinage

2001

Notch Effects in Fatigue and Fracture

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The notch effect in fracture is characterised by the fact that the critical gross stress of a notched structure is less that the critical net stress which acts on the remaining ligament area under the notch tip. The notch effect in fracture is sensitive to structure geometry, scale effects and loading mode. This cannot be explained by the hot spot approach (i.e. the value of the maximum stress) but can be by the volumetric approach . In this approach we assume that the fracture process needs a physical volume in which acts an average weighted stress. Two parameters are needed to describe the fracture criterion; the effective distance which corresponds to the diameter of the fracture proce ss volume assuming a cylindrical shape, and the effective stress. A procedure to determine the effective distance from the value of the minimum of the relative stress gradient is proposed and checked. The influence of notch radius on fracture toughness is described in terms of the energy J parameter. The existence of a critical notch radius below which the fracture toughness remains constant is verified. The notch effect in fatigue is characterised by the fact that the notched specimen Wohler curve is below the smooth specimen curve. For high cycle fatigue, the concept of effect ive stress range is able to represent the notch influence . For low cycle fatigue , the description is done in terms of effective strain energy density.

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The effect of notch radius on fracture toughness JIc

Cited by 59 publications

References 6 publications

Notch ductility of steels for automotive components

Notch ductility of steels for automotive components

Single-specimen evaluation of tearing resistance in SENT testing

Notch Effects in Fatigue and Fracture

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