Tearing modulus, J-integral, CTOA and crack profile shape obtained from the load-displacement curve only

Martinelli, A.; Venzi, S.

doi:10.1016/0013-7944(95)00100-x

Cited by 39 publications

(31 citation statements)

References 2 publications

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“…The movements of the CIR deduced by image processing partially confirm the application of the analytical model described in [12]. However, it is observed a value of the rotational parameter called r Ã (dimensionless ratio that identifies the CIR location by respect to the initial ligament), considerably higher than the previously well-established values, relative to non-high strength steels [18,19].…”

Section: Introductionsupporting

confidence: 68%

“…Thus, the crack tip is identified by a unique representative value, regardless of the specimen thickness. Following this simplified assumption, the residual ligament determination is straightforward, and a direct kinematical method for the fracture progression can be applied [12].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it is possible to realize a more realistic 3-D mesh for Finite Element computations, taking advantage of an updated value of the ligament, so that the model [12] can be applied in a more reliable form.…”

Section: Introductionmentioning

confidence: 99%

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Effect of fracture tunneling in DWT Tests

Marotta

Minotti

Salvini

2012

Engineering Fracture Mechanics

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a b s t r a c tThe work deals with the effective shape of the fracture during a Drop Weight Tear Test (DWT). An inexpensive technique, able to determine the geometrical shape of the fracture, is discussed and presented. The technique is capable to perform reliable measurements and offers a mathematical description of the fracture profile. In few words, the fracture tunneling measurement and its correlated effects are the objectives of this work. The technique is based on a copy of the fracture by a silicone mold, followed by a digital analysis of the tomographic images. The attention is finally focused on two different steels used in inshore gas piping. The tunneling measurement is exploited in a finite element simulation of the fracture propagation, thus opening the opportunity to update the kinematic models applied for Crack Tip Opening Angle assessment.

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Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

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Effect of fracture tunneling in DWT Tests

Marotta

Minotti

Salvini

2012

Engineering Fracture Mechanics

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“…In some works [3,6], the crack extension was estimated by limit loading hypothesis based on the change of the force over the propagation, compared with the maximum force at crack initiation, as Eq. (4).…”

Section: Dynamic Crack Extension and Constant Of A*mentioning

confidence: 99%

“…Most significantly, the critical Crack Tip Opening Angle, CTOA C over the steadystate stage of crack propagation derived from DWTT [1] has been also ascertained as a measure of crack arrest capacity, conveniently and economically conducted in a mill test. In the recent works, a single-specimen energy based regression method [2] to estimate CTOA C has been proposed on the basis of well-known MartinelliVenzi rigid-plastic ductile fracture model [3]. By using the regression of absorbed energy against the impact load as input, the regression method shall give more reliable consequences than conventional simple energy input approaches [4].…”

Section: Introductionmentioning

confidence: 99%

Industrial application of Instrumented DWTT in evaluating material resistance to ductile fracture for modern pipeline steels

Fang

Zhang

Huang

2015

EPJ Web of Conferences

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Abstract. CTOA C of typical X70, X80 and X90 pipeline steels plates were evaluated by using energy based regression method upon their single specimen. Clear difference in the material resistance to ductile cracking could be distinguished by the values of CTOA C and their characteristic fracture surface. The region of stable cracking on the fracture surface could be identified from the dynamic crack extension curve, with the help of key-curve method. In the meanwhile, the crucial material based parameter required by many other CTOA C algorithm, (A * σ f ) of present X70, X80 and X90 plates were experimentally determined, also proving the validity of theoretical geometric factor A * to be 0.30-0.34, close to the commonly cited constant of 1/3.

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The CTOA as a Parameter of Resistance to Crack Extension in Pipes Under Internal Pressure

Amara

Pluvinage²,

Capelle

et al. 2016

Fracture at All Scales

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Different methods of CTOA measurements are described: Optical microscopy coupled with digital image correlation, analytical analysis of experimental load-displacement curves or simulation by Finite Element method. Using a Modified Compact Tension (MCT) specimen at room temperature, tests are performed to measure the value of the CTOA of API 5L X65 pipe steel. The influence of thickness on CTOA has been studied and explained through a "triaxial stress constraint". Crack extension is modelled by the finite element method using the CTOA criterion coupled with the node release technique. Crack velocity, arrest pressure and crack extension at arrest have been determined. Values of the CTOA are not intrinsic to materials. Like other measures of fracture toughness, it is sensitive to geometry and loading mode. This sensitivity can be described by a constraint parameter. For the thickness effect, the constraint parameter T z is very appropriate.

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Tearing modulus, J-integral, CTOA and crack profile shape obtained from the load-displacement curve only

Cited by 39 publications

References 2 publications

Effect of fracture tunneling in DWT Tests

Effect of fracture tunneling in DWT Tests

Industrial application of Instrumented DWTT in evaluating material resistance to ductile fracture for modern pipeline steels

The CTOA as a Parameter of Resistance to Crack Extension in Pipes Under Internal Pressure

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