| 1 | FRACTURE RESISTANCE OF 3D-C/SiC COMPOSITES AT 1300℃显示文摘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. | G.C.Ji S.R.Qiao S.M.Du M.Li D.Han J.N.Wei | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，4： | 0 |
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