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Fatigue assessment of cast components
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , iv, 17 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2005:24
Keyword [en]
Engineering design
Keyword [sv]
Konstruktionsteknik
National Category
Reliability and Maintenance
Identifiers
URN: urn:nbn:se:kth:diva-342ISBN: 91-7178-102-1 (print)OAI: oai:DiVA.org:kth-342DiVA: diva2:9217
Presentation
2005-06-06, Seminarierum 540, Teknikringen 8, Stockholm, 10:15
Note
QC 20101124Available from: 2005-08-01 Created: 2005-08-01 Last updated: 2010-11-24Bibliographically approved
List of papers
1. On the prediction of crack propagation in cast steel specimens
Open this publication in new window or tab >>On the prediction of crack propagation in cast steel specimens
2004 (English)In: 9th Portuguese Conference on Fracture, 2004Conference paper, Published paper (Refereed)
Abstract [en]

This investigation deals with the fatigue behaviour of cast steel with respect to defects, crack initiation, crack growth and material parameters. It constitutes the initial part of a larger work in cast materials. The main objectives have been to validate calculations made by FEM and Paris law with data from fatigue tests and to confirm material parameters for Pan's law. Furthermore, the results where put against calculations obtained from the fracture mechanic software AF-GROW. During the accomplishment some difficulties was experienced concerning the initiation of the crack, with result that there where just a few specimens suitable for evaluation by LEFM. However, some conclusions concerning the crack growth behaviour could yet be done. The results in general showed good correspondence, the results from AF-GROW included. Most divergences could be explained by residual stresses and, to some extent, the initiation problems.

National Category
Reliability and Maintenance
Identifiers
urn:nbn:se:kth:diva-14059 (URN)
Conference
February 18th – 20th 2004, Setúbal
Note
QC 20100712Available from: 2010-07-12 Created: 2010-07-12 Last updated: 2010-11-24Bibliographically approved
2. Conventional vs. closure free crack growth in nodular iron
Open this publication in new window or tab >>Conventional vs. closure free crack growth in nodular iron
2005 (English)In: Competent Design by Castings: Improvements in a Nordic Project / [ed] Samuelsson J, Marquis G, Solin J, Valtion Teknillinen Tutkimuskeskus , 2005, 273-286 p.Conference paper, Published paper (Refereed)
Abstract [en]

This investigation deals with the fatigue properties and material parameters for a silicon alloyed nodular cast iron. The material follows the Swedish standard SS 140725. The objectives for this investigation where to evaluate properties of the material in a fracture mechanic sense of view. In this part, the attention was paid to the basic fracture mechanic properties, i.e. da/dN-curves and Pan's law parameters. It also include R-dependence behaviour evaluated for R-values from R= 0 and R= 0.8. The main incitement for using the closure free approach is that it produces the fastest crack propagation rate that can be found at given conditions and load levels. This investigation of nodular iron will be followed by subsequent parts. The investigation in total is a part of the nordic project "Cast Design 2005".

Place, publisher, year, edition, pages
Valtion Teknillinen Tutkimuskeskus, 2005
Series
Valtion Teknillinen Tutkimuskeskus. VTT Symposium, ISSN 0357-9387 ; 237
National Category
Reliability and Maintenance
Identifiers
urn:nbn:se:kth:diva-14069 (URN)000231578700016 ()2-s2.0-42149127654 (Scopus ID)951-38-6298-4 (ISBN)
Conference
Seminar on Competent Design by Castings (GJUTDESIGN -2005) Espoo, FINLAND, JUN 13-14, 2005
Note

QC 20100712

Available from: 2010-07-12 Created: 2010-07-12 Last updated: 2012-09-26Bibliographically approved
3. Fracture mechanics evaluation of a nodular cast iron component by 3d modelling
Open this publication in new window or tab >>Fracture mechanics evaluation of a nodular cast iron component by 3d modelling
2005 (English)In: Competent Design by Castings: Improvements in a Nordic Project / [ed] Samuelsson J; Marquis G; Solin J, 2005, Vol. 237, 351-374 p.Conference paper, Published paper (Refereed)
Abstract [en]

The object of this paper was fracture mechanic modelling of solids using finite element (FEM). The main tool that has been utilized was the software Mcrack which is a group of macros intended for use jointly with ANSYS finite element program. One major advantage of the Mcrack software is that it supports solid modelling with a crack located at an arbitrary location. This implies that it is possible to calculate also torsion and mixed mode cases within a most reasonable work effort. However, Mcrack was developed to cover complex weld geometries. Utilizing Mcrack for general solid modelling requires an analysis of the possibility of development for arbitrary crack paths. As test object a cast sleeve made of nodular iron has been used. Previous to this investigation the component was submitted to a test program and a subsequent evaluation according to S/N criteria's at ABB, Sweden. This paper is thus a continuation of the ABB work, and at the same time an extension of the field of application for the Mcrack software. For validation purposes the software AF-Grow as well as elementary cases has been used in parallel. The investigation is a part of the nordic project "Cast Design 2005".

Series
VTT SYMPOSIA, ISSN 0357-9387 ; 237
Keyword
Brittleness; Cast iron; Computer software selection and evaluation; Crack detection; Finite element method; Fracture fixation; Fracture mechanics; Iron; Macros; Mechanics; Modal analysis; Strength of materials; Testing; Three dimensional; 3-D modeling; Arbitrary cracks; Finite element (FE); Finite element programs; General (CO); Mixed modes; Nodular cast iron; Solid modelling; Test object (TO); test programs; Torsion (IGC: D7)
National Category
Reliability and Maintenance
Identifiers
urn:nbn:se:kth:diva-14046 (URN)000231578700020 ()2-s2.0-42149099990 (Scopus ID)
Conference
Seminar on Competent Design by Castings (GJUTDESIGN -2005), Espoo, FINLAND, JUN 13-14, 2005
Note
QC 20100709Available from: 2010-07-09 Created: 2010-07-09 Last updated: 2011-10-13Bibliographically approved

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • text
  • asciidoc
  • rtf