A Basic Study on Static and Impact Fracture Behaviors of Different Phase Plastics Having Inclined Crack

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In this paper, mixed-mode static and dynamic stress intensity factors of different phase plastics were determined by using photoelastic and caustics methods. Specimens were composed by bonding between epoxy resin, PMMA and polycarbonate by epoxy bond. Upper materials of specimens were epoxy resin, PMMA and polycarbonate. Lower materials were polycarbonate with inclined V notch for all. Angle of V notches was 45 degree. As the result of this experiment, stress intensity factor of different phase plastics was lower than non-interface specimen. It is clear that crack tips influenced these interfaces and mechanical properties of upper phase materials. In dynamic behavior, each specimen showed a similar tendency up to 250μs. Dynamic stress intensity factor increase became less at 250μs, and afterwards became more. And cracks were propagated at t=500μs for interface, next reached interface and became interface crack.
日本実験力学会の論文