For the development of a rotational symmetrical polyurethane part with a steel reinforcement, a requirement/constraint driven approach to process design has been taken. In this approach a scale model of the process was built using fused deposition modeling (FDM) rapid prototyping technique, then used to validate design, material and process parameters. After selection and testing on the scaled ...

The wear of polymer-based materials is connected to their brittleness. We have previously formulated a quantitative definition of brittleness in terms of elongation at break and storage modulus for thermoplastic polymers. We provide a formula connecting brittleness to viscoelastic recovery (healing) after sliding wear. Our model fits a selection of ten thermoplastics representing several classe...

Polyphenylsulfone was thermally aged at temperatures corresponding to its processing and mainly shown undergo crosslinking as observed by measurements of average molar mass, rheometry changes in glass transition temperature. Those experiments were completed mechanical testing thin sample films 250 280 °C. The same degradation mechanisms result a strong decrease ultimate strain accompanied sligh...