Designing plastic parts for assembly by Paul A. Tres

By Paul A. Tres

This ebook presents a good software for either pro half designers and newbies to the sector, facilitating low-priced layout judgements and making sure that the plastic components and items will get up below use. The targeted, but simplified dialogue of fabric choice, production suggestions, and meeting techniques permits the reader to guage plastic fabrics and to competently layout plastic elements for meeting. This booklet describes sturdy joint layout and implementation, the geometry and nature of the part components, the kinds of load concerned, and different easy info worthy so that it will paintings effectively during this filed. all through, the remedy is practice-oriented and all for daily difficulties and occasions

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Some products are expected to be completely rebuilt or replaced after 10 years; others may be replaced after less than one year. The safety factor is therefore determined by the norms (specifications) of the industry. For a new product in a new industry with no established product life expectancies, testing the product and measuring the stress level for failure can determine a safety factor. These values, measured against original material properties, will provide a good starting point for establishing time-related safety factors.

Plasticity occurs when the stress goes beyond the yield point on the stress-strain curve for any given material. This material property can be utilized in cold-forming processes for some plastics. Increases in temperature greatly affect plasticity, especially in thermoplastic resins. 4 Ductility The material’s ability to be stretched, pulled, or rolled into shape without destroying its integrity is called ductility (Fig. 16). Polymers are categorized as ductile or ­brittle at a given temperature.

9 Creep Plastic parts exhibit two important properties that can occur over long-term loading: creep and stress relaxation. 1 Introduction When a constant load is applied to a plastic part, it induces an internal stress. Over time, the plastic will slowly deform to redistribute the internal energy within the part. A test that measures this change is performed by applying a constant stress over time. This time-related flow is called creep. 33 shows a creep experiment in which a specimen bar is held vertically from one end.

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