Crack-growth criteria and non-linear fracture mechanics

Broberg, K. B.

doi:10.1016/0022-5096(71)90008-1

Cited by 242 publications

(92 citation statements)

References 6 publications

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“…The mid-thickness plane is z = 0, while the two free surface planes are z0 = +(to/2) (subscript zero refers to the initial, undeforrned state). The EWF concept was developed by Cotterell and Reddel [1] following an idea of Broberg [4]. According to this theory, the work WI spent to bring a DENT specimen to fracture can be divided into two parts:…”

Section: T H E Essential W O R K Of Fracturementioning

confidence: 99%

“…The existence of a fracture process zone with constant size during propagation may be assumed to lead a linear relationship between the final displacement and 10 [5]. In this case, we have dfinal = Ac + Olo, (4) where • d~noa is the final displacement measured at the completion of cracking; • A~ is the average value of the critical CTOD; • 0 is a constant equal to the angle of opening of the fracture process zone. According to this model Ac can be obtained by linear regression on the final displacement.…”

Section: T H E Essential W O R K Of Fracturementioning

confidence: 99%

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Experimental and numerical investigation of fracture in double-edge notched steel plates

et al. 1996

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Double-edge notched (DENT) steel plates were pulled until complete fracture and several experimental observations were made (using profilometry and scanning electron microscopy). The essential work of fracture (EWF) model was found to be well verified. Numerical simulations -up to the maximum load only -of some experiments were performed using the finite element method (FEM), and incorporating geometric and material non-linearities (large deformation elasto-plasticity). Some experimental measurements were compared with the corresponding numerical computations and excellent agreement was found.

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Section: T H E Essential W O R K Of Fracturementioning

confidence: 99%

Section: T H E Essential W O R K Of Fracturementioning

confidence: 99%

Experimental and numerical investigation of fracture in double-edge notched steel plates

et al. 1996

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“…The use of the J-integral as an elastic-plastic fracture criterion has been discussed by Broberg [8] from an analytical point of view. A justification for choosing this parameter as a fracture criterion comes from the consideration of the Hutchinson-Rice-Rosengren (HRR) crack tip model [5,9], where the product of plastic stress and strain is shown to have l/r singularity where r is a near tip crack field length parameter.…”

Section: Introductionmentioning

confidence: 99%

The J-integral as a fracture criterion for polycarbonate thermoplastic

Singh

Parihar

1986

J Mater Sci

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Fracture behaviour of a polycarbonate thermoplastic has been investigated. Fracture tests were conducted on single edge notched specimens and the J-integral evaluated using energy rate interpretation. Its value has been found to be independent of crack length when crack length to specimen width (a/w) is larger than 0.34. For smaller cracks general material damage away from the crack tip is also found to influence the energy absorbed. An extrapolation method has been used to separate the crack tip energy from the energy absorbed due to general material damage. The J-integral thus obtained is independent of crack length and specimen length and its critical value is the same as obtained for a/w > 0.34 without extrapolation. The critical stress intensity factor was also evaluated using the R-curve approach. It has been found that the J-integral agrees well with the criticial stress intensity factor obtained using the R-curve approach.

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“…under tensile loads) via deviation from the shear zone to the angle of fracture, b rup . Broberg [32] showed that the damage is limited to a small region at the crack tip. In the next section, the propagation mechanisms in this region are analyzed in detail.…”

Section: The Process Of Crack Creationmentioning

confidence: 99%

Experimental and numerical analysis of micromechanical damage in the punching process for High-Strength Low-Alloy steels

Achouri

Germain

Santo

et al. 2014

Materials & Design (1980-2015)

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. b s t r a c tSequential sheet metal forming processes can result in the accumulation of work hardening and damage effects in the workpiece material. The mechanical strength of the final component depends on the ''evolution'' of these two characteristics in the different production steps. The punching process, which is usually in the beginning of the production chain, has an important impact on the stress, strain and damage states in the punched zones. It is essential that the influence of these mechanical fields be taken into account in the simulation of the forming sequence. In order to evaluate the evolution of each phenomenon, and in particular damage accumulation in the forming process, it is essential to characterize the punching process. The objective of this work is to understand and identify the physical damage mechanisms that occur during the punching operation and to establish relevant numerical models to predict the fracture location. The effect of the punch-die clearance on mechanical fields distribution is also discussed in this work.

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Crack-growth criteria and non-linear fracture mechanics

Cited by 242 publications

References 6 publications

Experimental and numerical investigation of fracture in double-edge notched steel plates

Experimental and numerical investigation of fracture in double-edge notched steel plates

The J-integral as a fracture criterion for polycarbonate thermoplastic

Experimental and numerical analysis of micromechanical damage in the punching process for High-Strength Low-Alloy steels

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