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

Knockaert, Robert; Doghri, Issam; Marchal, Y.; Pardoen, Thomas; Delannay, Francis

doi:10.1007/bf00012430

Cited by 29 publications

(14 citation statements)

References 13 publications

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“…For ligament lengths within the limits of validity of the model, the behaviour of the process zone depends little on the ligament length and it is thus normal that the cracks start propagating at a displacement corresponding to the crack-tip opening displacement of the plate. This conclusion is supported by recent finite element calculations which confirm that the CTOD at a given displacement is nearly independent of the ligament size [15].…”

Section: (1) Validity Of the Ewf Methodssupporting

confidence: 75%

Influence of test parameters on the measurement of the essential work of fracture of zinc sheets

Marchal

Delannay

1996

Int J Fract

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The Essential Work of Fracture (EWF) concept is used to characterize the fracture of thin plates of a zinc alloy. The consistency and applicability of the EWF approach are discussed. The successive stages of the fracture process were studied: the evolution of the shape of the crack tip was observed with a scanning electron microscope, the shape of the plastic zone and the evolution of necking in the ligament ahead of the crack tip were measured using a laser profilometer and the onset of cracking in the ligament was detected by means of a TV camera coupled with acoustic emission recording. The influence of both test parameters and material parameters on the Essential Work of Fracture (w~) and on the CTOD (~c) are elucidated. The effects of specimen geometry, deformation rate, texture and grain size are especially investigated. The main advantages and drawbacks of the EWF method are highlighted. Nomenclature ant = Slope of/~m~x against l, /3 = Shape factor, tic = Crack-tip opening displacement, ~, = Factor (= w~/(a~. 6c)), Fm~x = Maximum load, l = Ligament length, t : Thickness of the plates. u : Displacement. rp = Extent of the plastic zone. W = Width of the plates. Wtot = Total work of fracture. W~ = Essential work of fracture. Wp = Non essential work of fracture.'//)tot = Specific total work of fracture. w~ = Specific essential work of fracture. wp = Specific non essential work of fracture. dy = Ultimate elongation.

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Section: (1) Validity Of the Ewf Methodssupporting

confidence: 75%

Influence of test parameters on the measurement of the essential work of fracture of zinc sheets

Marchal

Delannay

1996

Int J Fract

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“…Knockaert et al obtuvieron un valor de 400 ± 15 kJ/m 2 para un acero de embutición de 1,5 mm de espesor y 225 MPa de límite elástico, con r = 200 µm [17] .…”

Section: Discussionunclassified

Evaluación del trabajo esencial de fractura en chapa de un acero de alta resistencia de fase dual

Gutiérrez¹,

Pérez²,

Lara³

et al. 2013

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“…A two-dimensional, plane-stress 2-D model was used to generate load-displacement curve of various ligament lengths. However, as pointed out by Knockaert et al (1996), the 2-D model could not take into account the significant variation of the through-thickness stress near the crack tip. In addition, the 2-D model could not generate the necking behaviour.…”

Section: Numerical Simulation Of the Dent Testmentioning

confidence: 94%

“…Knockaert et al (1996) used a 3-D FEM model, based on classical J 2 plasticity theory with isotropic work hardening, to investigate the deformation behaviour of low carbon steel. Due to the limited ductility of steel, the simulation was conducted only up to the peak load without any involvement of the crack initiation or growth.…”

Section: Numerical Simulation Of the Dent Testmentioning

confidence: 99%

On the application of FEM to deformation of high-density polyethylene

Kwon

Jar

2008

International Journal of Solids and Structures

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This paper presents a study that uses finite element method (FEM) to simulate deformation behaviour of high-density polyethylene (HDPE) when subjected to tensile loading, either without or with the presence of pre-cracks. For the former, dog-bone-shaped model of HDPE was deformed under uni-axial tensile (UT) loading beyond the initial yielding, to generate stable necking in the gauge section. The paper proposes a simple correction factor to determine the equivalent von Mises stress that is needed for the input to the FEM model, in order to generate the same loading level as that observed experimentally for neck propagation. The paper points out that such consistency in the loading level could not be generated in the past mainly because of a misconception that axial stress in the neck was regarded as the equivalent of the von Mises stress. The study also explored the consideration of crack growth in double-edge-notched tensile (DENT) specimen, and showed that the conventional von Mises yield function, with the assumption of isotropic work hardening, cannot be directly applied to simulate the deformation behaviour of DENT specimen. Instead, empirical parameters were employed to reflect the polymer orientation during the necking process. The paper shows that FEM models for both UT and DENT tests can reproduce the experimental load-displacement curves quite accurately, and concludes that with a proper yield function to reflect the deformation involved in the mechanical tests, the deformation behaviour observed experimentally can be accurately mimicked using the FEM simulation.

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

Cited by 29 publications

References 13 publications

Influence of test parameters on the measurement of the essential work of fracture of zinc sheets

Influence of test parameters on the measurement of the essential work of fracture of zinc sheets

Evaluación del trabajo esencial de fractura en chapa de un acero de alta resistencia de fase dual

On the application of FEM to deformation of high-density polyethylene

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