R-CURVE BEHAVIOR IN CERAMIC COMPOSITES PRODUCED BY DIRECTED METAL OXIDATION

被引：17

作者：

RODEL, J

SINDEL, M

DRANSMANN, M

STEINBRECH, RW

CLAUSSEN, N

机构：

[1] TECH UNIV HAMBURG, ADV CERAM GRP, HAMBURG, GERMANY

[2] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM JULICH, INST MAT ENERGY SYST, W-5170 JULICH 1, GERMANY

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 1994年 / 14卷 / 02期

关键词：

D O I：

10.1016/0955-2219(94)90103-1

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Crack propagation in three materials (two commercial, one laboratory) produced by directed metal oxidation in a SiC filler was investigated. Crack growth was studied in situ with CT specimen in the scanning electron microscope. Crack tip shielding by the formation of elastic, frictional and ductile crack bridging elements could be observed R-curve behaviour was found with increases in fracture toughness from about 4 MPa.m1/2 to 7.5 MPa.m1/2 over a crack length of about 1.5 mm. Near crack tip opening displacements provided an estimate of the crack tip toughness value, T0 = 2.0 +/- 0.6 MPa.m1/2. COD measurements at the loadline allowed a distinction between large-scale and small-scale bridging regimes.

引用

页码：153 / 161

页数：9

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