Designing plastic parts for assembly by Paul A. Tres

By Paul A. Tres

This ebook presents an outstanding instrument for either pro half designers and rookies to the sector, facilitating low-priced layout judgements and making sure that the plastic components and items will rise up lower than use. The certain, but simplified dialogue of fabric choice, production strategies, and meeting methods permits the reader to guage plastic fabrics and to accurately layout plastic components for meeting. This ebook describes stable joint layout and implementation, the geometry and nature of the part components, the kinds of load concerned, and different uncomplicated details worthy for you to paintings effectively during this filed. all through, the remedy is practice-oriented and taken with daily difficulties and occasions

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Excessive stress concentrations can occur as a result of three types of conditions: grooves and holes, changes in the 17 18 1 Understanding Plastic Materials cross-sectional area brought about by shoulders or offsets, and various mounting methods. To account for stress concentration areas, a stress concentration factor k has been established. 19 Notch sensitivity created by grooves and holes For example, let’s consider a plate as shown in Fig. 20. In the course of designing a part, we need to determine the ideal fillet between two right-angle surfaces that will allow us to avoid a sharp corner.

The knit line is also visible (see Fig. 44), but not the cause of tooth failure. The microtome image shows high loads deforming the tooth, which is bent and then ruptured. ) 41 42 1 Understanding Plastic Materials Stress-strain curves for Delrin® 111P NC010 at various temperatures are shown in Fig. 43. It can be observed that when a tensile bar ASTM or ISO specimen is ­exposed to a stress of 71 MPa at room temperature (23°C or 73°F) the specimen will break. For example, if the temperature at which the test is conducted decreases to –40°C, the stress under which the Delrin® 111P will break increases to 105 MPa.

The cutting knife used to slice the specimen should be angled around 40 to 45° with respect to the part. Tungsten carbide tips provide the most precise cutting. ). A drop of Canada balsam is spread on the microscope glass slide, which measures 3 in. by 1 in. Using tweezers, the thin slice obtained is then mounted onto the slide and flattened out because it has a tendency to curl. Once the specimen is flattened, the cover glass, with balsam on one of its surfaces, is placed on top, forming a sandwich assembly, with the specimen in the middle.

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