Plastics Engineering 3E Episode 13 docx

... Orientation can be introduced into plastics such as polyethylene and polypropy- lene (both semi-crystalline) by cold drawing at room temperature. Other brittle plastics such as polymethyl methacrylate ... use of these rules: Structure of Plastics 423 Fig. A. 12 Qpical illustration of spherulites Twisted tddcd chain growth from nucleus Fig. A .13 Structure of...

Ngày tải lên: 13/08/2014, 09:20

... to two unheated halves of a mould to disperse resin throughout a 328 Processing of Plastics thermoplastics to try to overcome these problems. One approach has been to produce continuous ... for making hollow articles using liquid plastics, particularly PVC plastisols. A shell-like mould is heated to a pre-determined temperature (typically 130 °C for plastisols) and the liquid...

Ngày tải lên: 13/08/2014, 09:20

... 26, 33, 131 , 135 , Acetal, 4, 14, 59, 61, 76, 149, 418 Acrylic, 4, 15, 33, 34, 59, 90, 124, 136 , 149, 283, 308 Activation energy, 136 Alloys, 11 Aminos, 17 Amorphous, 4, 15, 137 , 405,420 ... Phenolics, 8, 17 Pigments, 3 Plane strain, 126, 132 , 154,428 Plane stress, 130 , 132 , 154, 427 Plastic zone, 133 Plasticisers, 3 Plastics, 1, 3 Plate constitutive equa...

Ngày tải lên: 13/08/2014, 09:20

... R.J. (Roy J.) Plastics engineering. 3rd ed. 1. Plastics I. Title 668.4 ISBN 0 7506 3764 1 Library of Congress Cataloguing in Publication Data Crawford, R.J. Plastics engineering/ R.J. ... 41 42 43 45 48 61 66 71 74 81 84 95 95 103 110 116 119 121 121 127 131 134 136 137 138 140 142 142 143 145 145 147 148 150 152 152 154 168 168 168...

Ngày tải lên: 13/08/2014, 09:20

... 1060 1 I40 138 0 130 0 1400 136 0 1630 1700 1400 1150 1200 1270 137 0 1420 134 0 905 1240 1050 920 950 2100 1400 130 0 1080 1800 1800 32 32 7855 7950 7135 8940 I .3 ... 1410 1180 1280 1190 1 200 1060 1140 138 0 130 0 1400 136 0 1630 1690 1400 1150 1270 137 0 1420 905 1240 1050 920 950 2100 1400 130 0 1080 1800 1800 38 68 70...

Ngày tải lên: 13/08/2014, 09:20

... plastics but fortunately an empirical relationship has been found to 64 Mechanical Behaviour of Plastics effect will be very small. Thus the above analysis is perfectly acceptable for engineering ... Mechanical Behaviour of Plastics 57 For some plastics, particularly nylon, the moisture content can have a signifi- cant effect on the creep behaviour. For such plastics, creep...

Ngày tải lên: 13/08/2014, 09:20

... results are sufficiently accurate for most practical purposes. 2 .13 Dynamic Loading of Plastics So far the deformation behaviour of plastics has been considered for situations where (i) the stress ... equivalent to a stress of 13 MN/m2 being applied continuously for 9600 hours and so the effective creep modulus would be 13/ 0.014 = 929 MN/m2. 112 Mechanical Behavio...

Ngày tải lên: 13/08/2014, 09:20

... BD0 75 100 138 Mechanical Behaviour of Plastics There is considerable evidence to show that there is a close connection between crazing and crack formation in amorphous plastics. At certain ... Fig. 2.78 i Fig. 2.78 Triaxial stress distribution at a notch Mechanical Behaviour of Plastics 131 Solution The stress intensity factor for this configuration is The informa...

Ngày tải lên: 13/08/2014, 09:20

... kg/m3 and 130 0 kg/m3, calculate the weight fraction of fibres in the composite. Solution From the rule of mixtures ~c = PfVf + Pmvm = PfVf + Pm(l- Vf) 1950 = 2540Vf + 130 0(1 - ... fibre fracture strain. Solution From the rule of mixtures ~c = PfVf + PmVm = 0 .13( 1800) + 0.7 (130 0) = 1450 kg/m3 = CfuVf + CmVm = 0.3(2.1) + 0.7(0.058) = 0.67 GN...

Ngày tải lên: 13/08/2014, 09:20

... previous section has considered the in-plane deformations of a single ply. In practice, real engineering components are likely to be subjected to this type of loading plus (or as an alternative) ... manually. The following Example compares the behaviour of a single ply and a laminate. Example 3 .13 A single ply of carbon fibre/epoxy composite has the following properties:...

Ngày tải lên: 13/08/2014, 09:20