Abstract
Ductile-brittle fracture transition of notched polycarbonate plate was studied with respect to the specimen thickness t, notch root radius ρ and the ratio of K_II to K_I As a result, there was a tendency to arise the brittle fracture as increased with t and 1/ρ under mode I loading. However, failure mode of natural cracked specimen, ρ = 0, of thick plate was ductile fracture. Moreover, it was revealed that failure mode was put under the control of ductile fracture as increased with the ratio of μ = K_II/K_I under mixed-mode loading. Caustic pattern formed by the information at the crack tip was obtained, and the ratio of μ was evaluated from the configuration of this pattern.
Published Version
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