Some key effects on the failure assessment of weld repairs in CrMoV pipelines using continuum damage modelling

Current research efforts in the development of high temperature defect assessment procedure are summarized. Creep exemption criteria are proposed for the assessment of defective structures at high temperature in consideration of the effects of loadings, operating temperature and service time. Time-dependent failure assessment diagram (TDFAD) is developed that covers major failure mechanisms of defective high temperature structures. Challenges due to the welding effect are discussed. TDFAD for weldments is derived for various combinations of materials. In order to develop a unified assessment method to cope with material and loading complexity, a new failure assessment diagram based on continuum damage concept is proposed to reflect the damage effect on ductile creep failure and brittle creep fracture.

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Continuum damage modelling and some computational issues

Revue française de génie civil ◽

10.1080/12795119.2002.9692728 ◽

2002 ◽

Vol 6 (6) ◽

pp. 991-1017 ◽

Cited By ~ 2

Author(s):

Gilles Pijaudier-Cabot ◽

Ludovic Jason

Keyword(s):

Continuum Damage ◽

Damage Modelling

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Continuum damage modelling in geomechanics

Degradations and Instabilities in Geomaterials ◽

10.1007/978-3-7091-2768-1_3 ◽

2004 ◽

pp. 77-105

Author(s):

Gilles Pijaudier-Cabot ◽

Ludovic Jason ◽

Antonio Huerta ◽

Jean-François Dubé

Keyword(s):

Continuum Damage ◽

Damage Modelling

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Continuum damage modelling of environmental degradation in joints bonded with E32 epoxy adhesive

Journal of Adhesion Science and Technology ◽

10.1163/156856107780437444 ◽

2007 ◽

Vol 21 (2) ◽

pp. 179-195 ◽

Cited By ~ 17

Author(s):

Y. Hua ◽

A. D. Crocombe ◽

M. A. Wahab ◽

I. A. Ashcroft

Keyword(s):

Environmental Degradation ◽

Epoxy Adhesive ◽

Continuum Damage ◽

Damage Modelling

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Failure Assessment of Pipe Tee Element Using Continuum Damage Mechanics

Volume 3: Design and Analysis ◽

10.1115/pvp2013-97344 ◽

2013 ◽

Cited By ~ 1

Author(s):

Nicola Bonora ◽

Domenico Gentile ◽

Andrew Ruggiero ◽

Gabriel Testa ◽

Paolo Folgarait ◽

...

Keyword(s):

Pipe Flow ◽

Damage Mechanics ◽

Symmetry Plane ◽

Continuum Damage Mechanics ◽

Material Damage ◽

Continuum Damage ◽

Structural Failure ◽

Ductile Rupture ◽

Failure Data ◽

Failure Assessment

In this work continuum damage mechanics was used to try to predict the occurrence of ductile rupture in a barred tee fitting subjected to pressure load. In order to account for the scatter in the material damage parameters, a stochastic definition was used. Ductile damage parameters were identified using failure data obtained from traction tests of round notched bar samples. The attention is concentrated on the possible failure of the grid since it occurrence can obstruct the pipe flow and drive the structural failure of the tee Numerical simulation indicates that the bars fail first but do not trigger the tee rupture. The location where ductile rupture is expected to initiate in the tee was found to be 30° out of the tee symmetry plane.

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Computation of brittle fracture propagation in strain gradient materials by the FEniCS library

Mathematics and Mechanics of Solids ◽

10.1177/1081286520954513 ◽

2020 ◽

pp. 108128652095451 ◽

Cited By ~ 1

Author(s):

E Barchiesi ◽

H Yang ◽

CA Tran ◽

L Placidi ◽

WH Müller

Keyword(s):

Brittle Fracture ◽

Strain Gradient ◽

Deformation Energy ◽

Maximum Energy ◽

Dissipated Energy ◽

Gradient Term ◽

Continuum Damage ◽

Damage Modelling ◽

Maximum Energy Release ◽

Non Locality

Strain gradient continuum damage modelling has been applied to quasistatic brittle fracture within an approach based on a maximum energy-release rate principle. The model was implemented numerically, making use of the FEniCS open-source library. The considered model introduces non-locality by taking into account the strain gradient in the deformation energy. This allows for stable computations of crack propagation in differently notched samples. The model can take wedges into account, so that fracture onset can occur at wedges. Owing to the absence of a damage gradient term in the dissipated energy, the normal part of the damage gradient is not constrained on boundaries. Thus, non-orthogonal and non-parallel intersections between cracks and boundaries can be observed.

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