Title :
Assessment of impact damage in carbon-carbon plates with correlation to residual compression strength after impact
Author :
Smith, B.T. ; Yamaki, Y.R.
Author_Institution :
Appl. Sci., Coll. of William & Mary, Williamsburg, VA, USA
Abstract :
Carbon-carbon composites were subjected to low-velocity impacts by a 0.5-in diameter air-driven aluminum sphere. Nominal impact energies ranged from 1/4 to 2 ft-lb. The samples were examined ultrasonically with conventional C-scan and with an advanced technique to image the damage through the thickness of the material. The samples were then tested to failure in compression, and a comparison was made between the compression strength and the imaged damage. Strength-degrading, low-energy impact damage in thin-gauge, uncoated carbon-carbon was easily detected ultrasonically, and the damage areas from the C-scans generally corresponded with those determined microscopically. Also, the ultrasonic technique for determining the volumetric damage profile was successfully utilized for this class of materials
Keywords :
carbon fibre reinforced composites; compressive strength; impact strength; ultrasonic materials testing; C fibre reinforced C composite; air driven Al sphere; conventional C-scan; failure; impact damage; impact energies; low-velocity impacts; residual compression strength; ultrasonic technique; volumetric damage profile; Aerospace materials; Aluminum; Fabrics; Fixtures; Ground support; Image coding; Pulse amplifiers; Reflection; Steel; Testing;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171502