Thermal stress FEM analysis of rock with microwave energy

Wang, Yicai and Djordjevic, Nenad (2014) Thermal stress FEM analysis of rock with microwave energy. International Journal of Mineral Processing, 130 74-81. doi:10.1016/j.minpro.2014.05.012

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Author Wang, Yicai
Djordjevic, Nenad
Title Thermal stress FEM analysis of rock with microwave energy
Journal name International Journal of Mineral Processing   Check publisher's open access policy
ISSN 0301-7516
Publication date 2014-07-10
Sub-type Article (original research)
DOI 10.1016/j.minpro.2014.05.012
Open Access Status
Volume 130
Start page 74
End page 81
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
Highlights
• Thermal cracking process is simulated by FEM.
• High power density combined with a short heating interval offers the best efficiency.
• The cracks start some distance away from the grain edges.
• The distance depends on the exposure time and thermal expansion of matrix.
• The grain size is the main factor causing cracks and matrix size affects the result.

This paper presents a study of a thermal breakage process used to analyse the thermal stress and crack development that occur when rock is exposed to short-pulse microwave energy. A two-dimensional circular plate, containing two-phase minerals, was used in finite element simulation to calculate thermal stress for the purpose of better understanding thermal fracture behaviour in comminution. It is found that the thermal mismatch between a microwave-absorbing inclusion and a low-absorbing matrix mineral can generate large localized thermal stresses around the inclusion. Fracture initially occurs, not around the grain boundaries between the two minerals, but some distance away, as a result of thermal expansion stress on the matrix mineral. The results also indicate that though grain size is one of the factors causing cracks during heating of granular materials, it is not the only reason. The size and the thermal properties of the matrix mineral can also affect the results of thermal stresses.
Keyword Thermal stress
Microwave energy
Numerical modelling
FEM
Cracks
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
Official 2015 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
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Created: Thu, 12 Jun 2014, 13:32:41 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre