FRACTURE RESISTANCE OF 3D-C/SiC COMPOSITES AT 1300℃

金属学报(英文版), 2004, 17(4): 437-442.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.College of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072,China;Material Engineering Department, Jiujiang College, Jiujiang 332005, China

2.College of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072,China

3.Material Engineering Department, Xi'an Science and Technical University, Xi'an 710060, China

4.College of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072,China

5.College of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072,China

6.Material Engineering Department, Jiujiang College, Jiujiang 332005, China

FRACTURE RESISTANCE OF 3D-C/SiC COMPOSITES AT 1300℃

Keywords： fracture resistance

Based on the energy conservation, the elastic energy linked to the compliance change,non-elastic energy dissipated by irreversible deformation and the resistance for crack propagation were quantitatively characterized by evaluation the load/load point displacement curves tested by three points bend experiment with single notch beam at 1300℃. The cracks length was determined by compliance calibration curves. It is shown by experimental results that the compliance of 3D-C/SiC composites changes with the cracks can be described by third order polynomial. The variation of crack advancing resistance with non-dimensional equivalent crack length presents a convex curve. The crack advancing resistance increases firstly and then decreases with the non-dimensional equivalent crack length, finally is in comparatively low level. The maximum values of crack advancing resistance are 269.73k J/m2 for nondimensional equivalent crack length of 0.318 and original notch length of 0.35mm,and 138.65k J/m2 for non-dimensional equivalent crack length of 0.381 and original notch length of 2.06mm, respectively.

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FRACTURE RESISTANCE OF 3D-C/SiC COMPOSITES AT 1300℃

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