Effect of Residual Stresses on Fracture Resistance of Arctic Structures
In integrity assessments, residual stresses have a significant effect on the crack driving force. In fracture assessments according to BS 7910 residual stresses are treated conservatively, and is often assumed to be equal to the material yield strength. In this work, a finite element model of a crac...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Master Thesis |
Language: | English |
Published: |
Institutt for produktutvikling og materialer
2013
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/241750 |
id |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/241750 |
---|---|
record_format |
openpolar |
spelling |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/241750 2023-05-15T15:04:59+02:00 Effect of Residual Stresses on Fracture Resistance of Arctic Structures Magnor, William Hauge, Mons Norges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for produktutvikling og materialer 2013 http://hdl.handle.net/11250/241750 eng eng Institutt for produktutvikling og materialer 644197 ntnudaim:9183 http://hdl.handle.net/11250/241750 94 Master thesis 2013 ftntnutrondheimi 2019-09-17T06:48:57Z In integrity assessments, residual stresses have a significant effect on the crack driving force. In fracture assessments according to BS 7910 residual stresses are treated conservatively, and is often assumed to be equal to the material yield strength. In this work, a finite element model of a cracked steel plate was used to study the contribution to crack driving force from residual stresses. Residual stresses were introduced by the eigenstrain method and nodes were released to create cracks. Crack depths, a, up to 20 mm, crack lengths, 2c, up to 50 mm and through thickness cracks were investigated. Solutions were compared to reference solutions with the same crack dimensions, but no residual stress. Corresponding fracture assessments according to BS 7910 were performed to illustrate the difference in crack driving force between FEM and BS 7910. The dimensionless parameter R, was developed during this work and denotes the effect of residual stresses. R can be computed both for results from FEM and BS 7910. It can be seen that R depend on crack parameters and decrease as load increase. Generally, R is significantly higher for solutions according to BS 7910. Master Thesis Arctic NTNU Open Archive (Norwegian University of Science and Technology) Arctic |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
description |
In integrity assessments, residual stresses have a significant effect on the crack driving force. In fracture assessments according to BS 7910 residual stresses are treated conservatively, and is often assumed to be equal to the material yield strength. In this work, a finite element model of a cracked steel plate was used to study the contribution to crack driving force from residual stresses. Residual stresses were introduced by the eigenstrain method and nodes were released to create cracks. Crack depths, a, up to 20 mm, crack lengths, 2c, up to 50 mm and through thickness cracks were investigated. Solutions were compared to reference solutions with the same crack dimensions, but no residual stress. Corresponding fracture assessments according to BS 7910 were performed to illustrate the difference in crack driving force between FEM and BS 7910. The dimensionless parameter R, was developed during this work and denotes the effect of residual stresses. R can be computed both for results from FEM and BS 7910. It can be seen that R depend on crack parameters and decrease as load increase. Generally, R is significantly higher for solutions according to BS 7910. |
author2 |
Hauge, Mons Norges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for produktutvikling og materialer |
format |
Master Thesis |
author |
Magnor, William |
spellingShingle |
Magnor, William Effect of Residual Stresses on Fracture Resistance of Arctic Structures |
author_facet |
Magnor, William |
author_sort |
Magnor, William |
title |
Effect of Residual Stresses on Fracture Resistance of Arctic Structures |
title_short |
Effect of Residual Stresses on Fracture Resistance of Arctic Structures |
title_full |
Effect of Residual Stresses on Fracture Resistance of Arctic Structures |
title_fullStr |
Effect of Residual Stresses on Fracture Resistance of Arctic Structures |
title_full_unstemmed |
Effect of Residual Stresses on Fracture Resistance of Arctic Structures |
title_sort |
effect of residual stresses on fracture resistance of arctic structures |
publisher |
Institutt for produktutvikling og materialer |
publishDate |
2013 |
url |
http://hdl.handle.net/11250/241750 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
94 |
op_relation |
644197 ntnudaim:9183 http://hdl.handle.net/11250/241750 |
_version_ |
1766336758771875840 |