Various amounts of silica nanoparticles were chemically incorporated into amorphous polyurethanes (PU) of two different molecular weights by sol-gel reactions, and the effects were studied in terms of mechanical, dynamic mechanical, dual, and triple shape memory effects (DSME and TSME) of the nanocomposite films. It was found that the silica particles act as multifunctional cross-links as well as reinforcing fillers and significantly augmented the glassy and rubbery state moduli, yield strength, break strength, glass transition temperature, and dual shape memory properties. A cohesive bilayer of the two films fabricated from an interpenetrating polymer network (IPN) exhibited synergistic mechanical properties in the glassy and rubbery states along with two undisturbed glass transitions by which an intermediate plateau region and TSME were demonstrated.

No abstract

No abstract

No abstract

It is already known that the hardness number of a cold-forged product is closely related to its effective sl~ain. This paper presents a method of predicting the relation between effective slrains and hardness by using an FE-hardness test simulation based on the concept that hardness indicates resistance to plastic deformation. The results of the FE-simulation for the materials are compared with those of experiments and also with those of experiments purporting to show the feasibility of the proposed method.