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Conventional vs. closure free crack growth in nodular iron
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
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. 273-286 p.
Series
Valtion Teknillinen Tutkimuskeskus. VTT Symposium, ISSN 0357-9387 ; 237
National Category
Reliability and Maintenance
Identifiers
URN: urn:nbn:se:kth:diva-14069ISI: 000231578700016Scopus ID: 2-s2.0-42149127654ISBN: 951-38-6298-4 (print)OAI: oai:DiVA.org:kth-14069DiVA: diva2:329555
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
In thesis
1. Fatigue Assessment of Cast Components: Influence of Cast Defects
Open this publication in new window or tab >>Fatigue Assessment of Cast Components: Influence of Cast Defects
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

 This thesis is on the fatigue assessment of cast components with special attention to defects. The primary material in view is nodular cast iron, but also cast steel is considered. However, the fatigue behaviour is in principle valid for general use on other cast metals.The first two papers is about general cast material behaviour in fatigue loading. The materials considered are a high strength alloyed cast steel and a medium strength nodular cast iron. It is concluded that cast defects is the main fatigue initiation cause and it is only in exception that the fatigue life is not ruled by fracture mechanics. The third paper is a fracture mechanics evaluation of a nodular iron cast sleeve. The analysis of the component is based on crack initiation from cast defects and low-cycle fatigue. Fracture mechanics material parameters for Paris law, c and m, are extracted for the materials considered. In paper D design quality rules for nodular cast iron based on the Swedish standard SS 11 40 60 is presented. The quality rules regard cast defects in fatigue assessments and facilitate defect-based component design. In paper E, a finite element tool that is capable to predict and calculate 3D crack propagation for embedded cracks and defects is presented. The tool is an add-on for ANSYS finite element program. In paper F, closure equations for nodular cast iron are proposed in parallel to refined fracture mechanics material data. The paper includes crack propagation at different load ratios and in different microstructures.Summarized, the thesis composes a further development of the fatigue assessment of cast components. The central role of defects in fatigue is clarified and tools are provided for fracture mechanics evaluations of defects as well as for defect based design. The quality rules are also fit for application in manufacturing and for acceptance tests, hence covering the span from design to complete product.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. vi, 55 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2008:49
Keyword
cast nodular iron, fatigue, design rules, fracture mechanics
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-9133 (URN)978-91-7415-101-5 (ISBN)
Public defence
2008-09-29, F3, Lindstedtsvägen 26, Stockholm, 10:15 (English)
Opponent
Supervisors
Projects
Gjutdesign
Note
QC 20100712Available from: 2008-09-23 Created: 2008-09-22 Last updated: 2010-07-12Bibliographically approved
2. Fatigue assessment of cast components
Open this publication in new window or tab >>Fatigue assessment of cast components
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
Engineering design, Konstruktionsteknik
National Category
Reliability and Maintenance
Identifiers
urn:nbn:se:kth:diva-342 (URN)91-7178-102-1 (ISBN)
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

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
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  • de-DE
  • en-GB
  • en-US
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  • Other locale
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Output format
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  • text
  • asciidoc
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