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Fracture mechanics evaluation of a nodular cast iron component by 3d modelling
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, 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".

Place, publisher, year, edition, pages
2005. Vol. 237, 351-374 p.
Series
VTT SYMPOSIA, ISSN 0357-9387 ; 237
Keyword [en]
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: urn:nbn:se:kth:diva-14046ISI: 000231578700020Scopus ID: 2-s2.0-42149099990OAI: oai:DiVA.org:kth-14046DiVA: diva2:329373
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
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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CiteExportLink to record
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Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf