Evaluation of improved work of fracture in the mullite/cordierite laminate composites with transformation weakened cristobalite layers

Sang-Ho Lee, Chung Hyo Lee, Sang Jin Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The strength and work of fracture for the laminate-type composites of β-cristobalite and mullite/cordierite mixtures in 60:40 wt.% were evaluated by 4-point flexural test and numerical analysis. The fracture test was investigated, with laminates densified by hot-pressing, at different thickness ratios between mullite/cordierite and β-cristobalite. The β-cristobalite had critical grain size effect on the fracture behavior. The grain size of the β-cristobalite was controlled by annealing at 1300 °C. A load-deflection curve for the hot pressed sample annealed for 10 h showed a significant work of fracture (2.38 kJ/m2) with a strength of 131 MPa at the thickness ratio of cristobalite to the mullite/cordierite layer of 1:5. The improved work of fracture in the laminate was attributed to the matrix crack deflection by thermal and shear-induced phase transformation in the weakened cristobalite layer. Additionally, a numerical simulation performed by using quadrilateral 8-nodes curved layered shell element of DIANA supported the thickness ratio effect of the test results.

Original languageEnglish
Pages (from-to)469-475
Number of pages7
JournalComposites Science and Technology
Volume62
Issue number3
DOIs
Publication statusPublished - 2002 Feb 1

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Mullite
Silicon Dioxide
Laminates
Composite materials
Hot pressing
Numerical analysis
Phase transitions
cordierite
aluminosilicate
Annealing
Cracks
Computer simulation

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Engineering(all)

Cite this

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abstract = "The strength and work of fracture for the laminate-type composites of β-cristobalite and mullite/cordierite mixtures in 60:40 wt.{\%} were evaluated by 4-point flexural test and numerical analysis. The fracture test was investigated, with laminates densified by hot-pressing, at different thickness ratios between mullite/cordierite and β-cristobalite. The β-cristobalite had critical grain size effect on the fracture behavior. The grain size of the β-cristobalite was controlled by annealing at 1300 °C. A load-deflection curve for the hot pressed sample annealed for 10 h showed a significant work of fracture (2.38 kJ/m2) with a strength of 131 MPa at the thickness ratio of cristobalite to the mullite/cordierite layer of 1:5. The improved work of fracture in the laminate was attributed to the matrix crack deflection by thermal and shear-induced phase transformation in the weakened cristobalite layer. Additionally, a numerical simulation performed by using quadrilateral 8-nodes curved layered shell element of DIANA supported the thickness ratio effect of the test results.",
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Evaluation of improved work of fracture in the mullite/cordierite laminate composites with transformation weakened cristobalite layers. / Lee, Sang-Ho; Lee, Chung Hyo; Lee, Sang Jin.

In: Composites Science and Technology, Vol. 62, No. 3, 01.02.2002, p. 469-475.

Research output: Contribution to journalArticle

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