Steady-state creep rate data are given here for some alloy taken at 200°C (473 K): (h-1) (MPa) 2.3 × 10-3 54 2.5 × 10-2 71 If it is known that the activation energy for creep is 160000 J/mol, compute the steady-state creep rate at a temperature of 240°C (513 K) and a stress level of 45 MPa.

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?