Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
Finite element analysis of thermally induced residual stresses in functionally graded materials.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Functionally graded materials (FGMs) are advanced materials and their main characteristic is microstructure and composition variation over the volume of the specimen. This variation of the composition results in changing of material properties in the component. In FGMs usually there are two different types of powder materials such as metal and ceramic powders which are mixed to build up the graded region. These grade layers are placed between the metal and ceramic layers and by this approach a smooth and gradual transient from metal to ceramic can be achieved.Sintering is the main technique to manufacture these types of materials. During the sintering process, cooling of the specimen from sintering temperature to room temperature results in generation of thermal residual stresses within the material. These thermal stresses may cause crack propagation and failure of the material.Distribution analysis of these thermally induced stresses within the material has been carried out in this thesis work. Finite element package ABAQUS has been used in order to simulate the distribution of the thermal residual stresses in the materials. In order to achieve the optimal design for different geometries the parametric study also has been performed. For example influence of number of layers, mixing ratio and porosity has been investigated.Based on the finite element results for cylindrical and cuboid models, non-linear composition variation for both geometries has no improving effect in terms of induced thermal residual stresses. Porous material shows less thermal stress than non-porous material. As the amount of porosity for individual layer was considered in simulation process, this approach resulted in decreasing of thermal stresses within the material. Moreover, non-uniform thickness of graded layers was not beneficial for stress reduction. This variation of thickness results in increasing of thermal residual stresses within the material.

Place, publisher, year, edition, pages
2012. , 33 p.
Keyword [en]
FEM, FGM, residual thermal stresses, crack, failure, sintering
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-92519OAI: oai:DiVA.org:kth-92519DiVA: diva2:513353
Educational program
Master of Science in Engineering - Materials Design and Engineering
Presentation
2012-02-27, Seminar Room, Solid Mechanics Department, Stockholm, 10:15 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-06-05 Created: 2012-04-02 Last updated: 2012-06-05Bibliographically approved

Open Access in DiVA

Master Thesis Report(1847 kB)3063 downloads
File information
File name FULLTEXT01.pdfFile size 1847 kBChecksum SHA-512
6a4cb2f6c0a4297b6a9c580d0a6bacfbcefcbdd15cb8a27e3b939e401643464e82fa06e8581969da55ad65b406a89cb0b1a235a3bdda3a5416d1196bb6b7f783
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Hosseinzadeh Delandar, Arash
By organisation
Materials Science and Engineering
Other Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 3063 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 484 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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