Abstract
Inter-laminar shear strengths (ILSSs) of two types of C/C composites and two types of Tyrannohex were measured as a function of strain rate. Charpy impact test machine can be used to measure ILSS for dynamic tensile loading in double notched configuration. ILSS of the unidirectional C/C composite was nearly constant at the strain rates ranging from 1.6×10-5/s to 617/s, while that of cross-ply C/C composite increased with the rate. On the contrary, ILSSs of the both types of Tyrannohex decreased at the higher strain rates. For the unidirectional C/C composite, the crack propagation velocity could be measured using crack gages. The velocity of a crack which appeared between the double notches increased with the strain rate; 480m/s at 1.6×10-5/s and 1, 400m/s, at 1.6×10-1/s. The propagation veloc-ity of the crack at higher strain rates above 1.6×10-1/s could not be measured, because the crack gages failed to respond to the crack propagation in velocity.
