Crack shape evolution under bending-induced partial closure

•Shows that shallow corner cracks are not represented by concentric quarter-ellipses.•An new fitting by straight lines and non-concentric quarter-ellipses is proposed.•Reproduce the evolving geometry of crack front with step-by-step technique.•3D finite element analyses was performed with contact on...

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Bibliographic Details
Published in:Engineering fracture mechanics 2018-02, Vol.188, p.493-508
Main Authors: Corbani, S., Castro, J.T.P., Miranda, A.C.O., Martha, L.F., Carter, B., Ingraffea, A.
Format: Article
Language:English
Subjects:
3D finite element analyses
Bend strength
Bending
Bending-induced closure
Computer simulation
Crack propagation
Curve fitting
Evolution
Fatigue crack shape changes
Fatigue failure
Finite element analysis
Finite element method
Fracture mechanics
Materials science
Numerical analysis
Straight lines
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Summary:•Shows that shallow corner cracks are not represented by concentric quarter-ellipses.•An new fitting by straight lines and non-concentric quarter-ellipses is proposed.•Reproduce the evolving geometry of crack front with step-by-step technique.•3D finite element analyses was performed with contact on the crack closure. In this paper, crack shape evolution under out-of-plane pure bending loads in plates with an initial through-thickness edge crack is investigated experimentally and computationally. Such cracks were numerically simulated by a step-by-step 3D finite element technique as an attempt to reproduce the evolving geometry of the crack front for the present problem, considering contact on the closed part of the crack faces. The purpose of this numerical analysis was to identify the particular issues of this type of simulation and to demonstrate that it is feasible. In the experiments, beach marks were generated to identify crack front shapes during crack growth. New fitting crack front curves are proposed using straight lines combined with quarter-ellipses with non-concentric centers.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2017.10.002