Material design of intelligent plastic products with sound generation function due to snap-through buckling

Abstract

Audible sound generation due to snap-through buckling during bending deformation was studied using an injection-molded product with a hinge. The sound was clearly generated in a rigid plastic product with a specific shape of the hinge that was markedly deformed. The large elastic energy stored in the hinge by the bending deformation, which was suddenly released during buckling deformation, was responsible for the increased sound pressure. This phenomenon may be exploited as a sensor to control the maximum deformation at bending in intelligent plastic products.

Preparation of graded materials for miscible polycarbonate/poly(methyl methacrylate) blends by segregation under shear flow

“…The surface segregation phenomena should be noted because it will be widely detected during various processing operations in industry. Considering that a high shear rate accelerates surface segregation, this phenomenon is particularly relevant to material design with regard to injection molding 14,15 Recently, several manipulated material designs have been proposed for injection molding 47–50 . The phenomenon will also be relevant to novel methods of conferring functionality on injection‐molded products.…”