By Laurence W. McKeen
Part of a sequence of center databooks in the William Andrew Plastics layout Library, Fatigue and Tribological homes of Plastics and Elastomers presents a accomplished selection of graphical multipoint info and tabular information masking fatigue and tribology.
The idea of fatigue is especially user-friendly: if an item is subjected to a tension or deformation, and it really is repeated, the article turns into weaker. This weakening of plastic fabric is named fatigue. Tribology is the technology and expertise of surfaces involved with one another and consequently covers friction, lubrication and put on. The relief of damage and fatigue and the improvement of lubrication are key bottom-line matters for engineers and scientists taken with the plastics and product layout with plastics.
Fatigue and Tribological homes of Plastics and Elastomers, 2e, is an replace of all that has replaced on the planet of plastics because the 1st version seemed approximately 15 years in the past, and has been reorganized from a polymer chemistry standpoint.
- A hard-working reference device: a part of the day-by-day workflow of engineers and scientists enthusiastic about the plastics and product layout with plastics
- The relief of wear and tear and fatigue and the improvement of lubrication are key bottom-line concerns
- The info during this ebook supply engineers with the instruments they should layout for low failure rates
Read or Download Fatigue and Tribological Properties of Plastics and Elastomers, 2nd Edition PDF
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Additional info for Fatigue and Tribological Properties of Plastics and Elastomers, 2nd Edition
This approach has shown some success but becomes cumbersome when more than a few components are involved. Blending two or more polymers offers yet another method of tailoring resins to a specific application. Because blends are only physical mixtures, the resulting polymer usually has physical and mechanical properties that lie somewhere between the values of its constituent materials. For instance, an automotive bumper made from a blend of polycarbonate resin and thermoplastic polyurethane elastomer gains rigidity from the polycarbonate resin and retains most of the flexibility and paintability of the polyurethane elastomer.
The expanded beads are lighter than unexpanded beads so they are forced to the top of the vessel and removed. This expansion process lowers the density of the beads to 3% of their original value and yields a smooth-skinned, closed cell structure. Next, the preexpanded beads are usually “aged” for at least 24 hours in mesh storage silos. This allows air to diffuse into the beads, cooling them, and making them harder. These expanded beads are excellent for detailed molding. Extruded polystyrene (XPS), which is different from EPS, is commonly known by the trade name Styrofoam™.
If cooled quickly, PET polyester remains amorphous in the final product. Crystalline and amorphous plastics have several characteristic differences. Amorphous polymers do not have a sharp melting point, but do have what is called a glass transition temperature, Tg. A glass transition temperature is the temperature at which a polymer changes from hard and brittle to soft and pliable. The force to generate flow in amorphous materials diminishes slowly as the temperature rises above the glass transition temperature.