Abstract
The tensile mechanical properties of long (up to 77 mm length) SiC whiskers have been investigated using multiple-fracture testing. SiC whiskers fractured from two types of defects. Below approximately 10 GPa stress, fracture occurred from extraneous surface defects, such as foreign matter particles and growth appendages. Above 10 GPa, fracture initiated from intrinsic defects. The Weibull modulus for intrinsic whisker fracture was determined to be in the range 3 to 4. Tests on very long whiskers indicated a strength plateau at 16 GPa for intrinsic whisker fracture. A basic statistical fracture description for the intrinsic fracture of whiskers was derived, which predicts a plateau in the intrinsic whisker strength.
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