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Mechanical Behaviour of Plastics 47
0 Time
~og time
Fig. 2.4 Qpical creep curves
12 11 10 9 8 MN/m2
3
2.5
2
0.5
0
loo0 loo00 100000 1E+006 1E+007 1 E+008
(9)
Fig. 2.5 Creep curves for polypropylene at 20°C (density 909 kg/m3)
