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Numerical simulation of plasticity induced fatigue crack opening and closure for autofrettaged inter-secting holes

Herz, Elisabeth ; Hertel, Olaf ; Vormwald, Michael (2011)
Numerical simulation of plasticity induced fatigue crack opening and closure for autofrettaged inter-secting holes.
In: Engineering Fracture Mechanics, 78 (3)
Article, Bibliographie

Abstract

The autofrettage of intersecting holes leads to extremely high compressive residual stress fields. These stresses in combination with the plastic deformations decelerate fatigue cracks initiated at the hole intersection notch. Simulations of plasticity induced crack closure of such cracks are presented based on the strip yield and a finite element model. The strip yield model has been extended to allow for an input of residual stresses coming from elsewhere, e.g. from a finite element calculation or measurements. The calculations are applied for constant as well as variable amplitude loading. The numerical expense of the finite element based modelling for variable amplitude loading is still too high if millions of cycles have to be considered. Therefore, a new approximation method is proposed introducing compensatory load sequences. Simulation results are compared to experimentally determined results showing good agreement. However, the accuracy of crack initiation life estimates has turned out to provide a high potential for further improvement.

Item Type: Article
Erschienen: 2011
Creators: Herz, Elisabeth ; Hertel, Olaf ; Vormwald, Michael
Type of entry: Bibliographie
Title: Numerical simulation of plasticity induced fatigue crack opening and closure for autofrettaged inter-secting holes
Language: English
Date: February 2011
Publisher: Elsevier
Journal or Publication Title: Engineering Fracture Mechanics
Volume of the journal: 78
Issue Number: 3
Abstract:

The autofrettage of intersecting holes leads to extremely high compressive residual stress fields. These stresses in combination with the plastic deformations decelerate fatigue cracks initiated at the hole intersection notch. Simulations of plasticity induced crack closure of such cracks are presented based on the strip yield and a finite element model. The strip yield model has been extended to allow for an input of residual stresses coming from elsewhere, e.g. from a finite element calculation or measurements. The calculations are applied for constant as well as variable amplitude loading. The numerical expense of the finite element based modelling for variable amplitude loading is still too high if millions of cycles have to be considered. Therefore, a new approximation method is proposed introducing compensatory load sequences. Simulation results are compared to experimentally determined results showing good agreement. However, the accuracy of crack initiation life estimates has turned out to provide a high potential for further improvement.

Uncontrolled Keywords: Crack closure Fatigue crack growth Autofrettage Plasticity Common rail
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute of Steel Constructions and Material Mechanics > Fachgebiet Werkstoffmechanik
13 Department of Civil and Environmental Engineering Sciences > Institute of Steel Constructions and Material Mechanics
13 Department of Civil and Environmental Engineering Sciences
Date Deposited: 27 Jan 2015 15:01
Last Modified: 19 Mar 2015 08:53
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