Abstract
Unidirectional carbon fiber composites were subjected to the Iosipescu shear test under static and low velocity impact conditions (LVI). Specimens were cut for 00 and 900 test configurations. Static tests were carried out on a hydraulically activated MTS loading frame, where specimens were subjected to uniform straining. LVI tests were conducted on a drop tower facility. The shear response of the specimen was measured for both 00 and 900 specimen configurations. Strain rate effects on interfacial crack toughness were also measured. Pre-notched unidirectional stitched carbon fiber specimens were subjected to a static and LVI three point bend test. The crack propagation velocity was measured with the help of special crack propagation gages and a high resolution digital camera. Load vs. load point displacement was measured for every test. The effect of strain rate on fracture toughness was characterized.
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