3D thickness effects around notch and crack tip stress/strain fields
Notches and cracks are usually approximately modeled as two-dimensional problems using solutions from plane elasticity to quantify localized stress/strain concentration effects around their tips. However, they may be associated with high gradients that can severely restrict local Poisson-induced t...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2015-07-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_12.pdf |
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| Summary: | Notches and cracks are usually approximately modeled as two-dimensional problems using solutions from
plane elasticity to quantify localized stress/strain concentration effects around their tips. However, they may be associated
with high gradients that can severely restrict local Poisson-induced transversal strains and cause important 3D stress fields
around those tips. Fatigue crack initiation and growth, plastic zone sizes and shapes, and localized constraint effects that
affect toughness are typical problems associated with such 3D effects, which may lead to non-conservative damage and
life predictions if neglected. To quantify how important they can be, first finite element techniques are used to simulate
thickness and notch-tip radius effects in the fields around such tips, and to evaluate their importance from the structural
design point of view. Then, versatile sub-modeling techniques are used to study similar effects along the fronts of short
and long cracks, and a stepwise re-meshing routine is used to show how an initially straight crack must slightly curve its
front during its propagation by fatigue, due to the unavoidable 3D effects that always surround real crack tips. |
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| ISSN: | 1971-8993 1971-8993 |