A technique for cold rolling thermoplastics is described and the results of compression tests on some rolled materials are described in terms of basic stress-strain curves. There is evidence of a general improvement in mechananical performance particularly for biaxially oriented (cross-rolled) material. Density changes are examined and a pronounced resistance to environmental cracking for cold-worked materials is reported.
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References
1.
WilchinskyS. W.‘Orientation in cold-rolled polypropylene’, J. appl. Pol. Sci.19637, 923.
2.
WilliamsJ. G.FordH.‘Stress-strain relationships for some unreinforced plastics’, Jl mech. Engng Sci.19646 (No. 4), 405.
3.
WilliamsJ. G.‘Shoulder and friction effects in the compression testing of plastics’, Imperial College Report, 1965 (to be published).
4.
KellerA.RiderJ. G.‘On the tensile behaviour of oriented polyethylene’J. Mat. Sci.19661, 389.
5.
HayI. L.KellerA.‘A study of orientation effects in polyethylene in the light of crystalline texture. Part I. The molecular orientation on heat relaxation’, J. Mat. Sci.19661, 41.
6.
CarmichaelA. J.‘Volume changes in polyethylene during plastic deformation’, University of New South Wales Report No. 1-3, 1965.
