By R.J. Crawford, BSc, PhD, DSc, FEng, FIMechE, FIM (Auth.)
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Extra resources for Plastics Engineering
Sample text
J. A. and Menges, G. W. Haworth B. and Batchelor, J. Physics of Plastics, Hanser, Munich (1992) Belofsky, H. Plastics: Product Design and Process Engineering, Hanser, Munich (1995) Gruenwald, G. Plastics: How Structure Determines Properties, Hanser, Munich (1992) Dominghaus, H. M. C. L. 1 Introduction In Chapter 1 the general mechanical properties of plastics were introduced. In order to facilitate comparisons with the behaviour of other classes of materials the approach taken was to refer to standard methods of data presentation, such as stress-strain graphs, etc.
J~ 40 mm ~j [ / width 6 mm d Fig. 11 Ball-point pen clip design Solution Strain, e, is given by the ratio of stress, tr, to modulus, E. In the case of the pen clip, it is effectively a cantilever of length 40 ram. e. 6 GN/m 2 or from the appropriate isometric curve). 6 x 109 X 0 . 1 x 105 seconds), the isometric curves (Fig. 3 MN/m 2. 2 A polypropylene beam is 100 mm long, simply supported at each end and is subjected to a load W at its mid-span. 5%, calculate the largest load which may be applied so that the deflection of the beam does not exceed 5 mm in a service life of I year.
Conductive grades of DMC are now available with resistivities as low as 7 x 10 - 3 ohm m. Optical Properties. The optical properties of a plastic which are important are refraction, transparency, gloss and light transfer. The reader is referred to BS 4618"1972 for precise details on these terms. 9 gives data on the optical properties of a selection of plastics. g. acrylic, cellulosics and ionomers) whereas others may be made transparent. These include epoxy, polycarbonate, polyethylene, polypropylene, polystyrene, polysulphone and PVC.