Recent Extensions of Gurson’s Model for Porous Ductile Metals

Gologanu, Mihai; Leblond, Jean-Baptiste; Perrin, G.; Devaux, J.

doi:10.1007/978-3-7091-2662-2_2

Cited by 285 publications

(543 citation statements)

References 16 publications

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“…[30]. It is based on the works by Gologanu et al [31] for the account of the void aspect ratio and by Thomason [32] for the onset of coalescence with extensions to strain-hardening and for the modeling of the coalescence process [34]. A summary of the structure of the model is given in Appendix A.…”

Section: An Enhanced Model For Void Growth and Coalescencementioning

confidence: 99%

“…The void growth model is an extension of the Gurson [29] model proposed by Gologanu et al [31], which has been modified to account for strain-hardening [30]. It is a full constitutive model for a porous elastoplastic material containing axisymmetric spheroidal voids.…”

Section: Appendix a Enhanced Model For Void Growth And Coalescencementioning

confidence: 99%

“…The parameter g is tied to the oblateness of the void and taken to be 0 for prolate and spherical voids. From their analysis, Gologanu et al [31] derived analytical relationships for C, h, g, , h 1 , a 2 which can be expressed exclusively in terms of the state variables S and f, except for h 1 which also depends on the stress triaxiality. The heuristic parameter q depends on n, f 0 , and S in order to obtain accurate predictions towards void cells calculations (see [30] for the details about the expression of the dummy variables).…”

Section: Appendix a Enhanced Model For Void Growth And Coalescencementioning

confidence: 99%

“…The inclusion of the three points discussed before is made possible by a recent extension of Gurson's model [29] of plastic solids containing voids to include shape, coalescence and distribution effects [30] based on contributions by Gologanu et al [31] and Thomason [32].…”

Section: Introductionmentioning

confidence: 99%

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Micromechanics-based model for trends in toughness of ductile metals

2003

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Relations between fracture toughness and microstructural details have been calculated for ductile materials based on a dilatational plasticity constitutive model that has recently been proposed. The model generalizes the Gurson model to account for both void growth and coalescence with explicit dependence on void shape and distribution effects. Based on a small scale yielding formulation of crack growth, toughness trends are determined as a function of yield stress, strain-hardening, initial porosity, void shape and spacing as well as void spacing anisotropy. Distinctions are drawn between the engineering fracture toughness, which is typically associated with 0.2 mm of crack growth, and the theoretical toughness based on coalescence of the crack tip with the first void ahead of it. Comparison with one set of experimental data for a steel is made for which a fairly complete characterization of the microstructure is available.

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Section: An Enhanced Model For Void Growth and Coalescencementioning

confidence: 99%

Section: Appendix a Enhanced Model For Void Growth And Coalescencementioning

confidence: 99%

Section: Appendix a Enhanced Model For Void Growth And Coalescencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micromechanics-based model for trends in toughness of ductile metals

2003

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“…general overviews in [11][12][13][14] and its application to thin-walled structures in [15][16][17][18][19][20] or porous plasticity models, e.g. [21][22][23][24], have already been extensively validated by means of numerous tests on laboratory test pieces, e.g. [15][16][17][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Application of the cohesive model for predicting the residual strength of a large scale fuselage structure with a two-bay crack

Cornec

Schönfeld

Schwalbe

et al. 2009

Engineering Failure Analysis

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The residual strength of a curved and stiffened panel containing a two-bay crack was assessed using the cohesive model. This panel represents a section of a wide-body aeroplane fuselage. The tests were conducted at IMA GmbH Dresden in cooperation with Airbus Industries Germany. The structural panel was modelled using 3D finite elements and a layer of cohesive elements ahead of each crack tip allowing for 70 mm crack extension. Identification of the cohesive parameters was done on small laboratory test pieces. Special effort was made for the transfer of these parameters to the structure.Reasonably conservative predictions of the residual strength of the panel were achieved.The boundary conditions of the loading devices of the test rig are shown to have substantial influence on the predictions.

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