TY - JOUR
T1 - Evaluation of improved work of fracture in the mullite/cordierite laminate composites with transformation weakened cristobalite layers
AU - Lee, Sang Ho
AU - Lee, Chung Hyo
AU - Lee, Sang Jin
PY - 2002/2
Y1 - 2002/2
N2 - 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.
AB - 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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U2 - 10.1016/S0266-3538(02)00021-0
DO - 10.1016/S0266-3538(02)00021-0
M3 - Article
AN - SCOPUS:0036474162
SN - 0266-3538
VL - 62
SP - 469
EP - 475
JO - Composites Science and Technology
JF - Composites Science and Technology
IS - 3
ER -