Twinning and martensitic transformations in oriented high-density polyethylene
- 1 May 1974
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 29 (5) , 1061-1073
- https://doi.org/10.1080/14786437408226591
Abstract
The deformation of high-density polyethylene with a single crystal texture by shear in directions perpendicular to the chain direction has been examined by wide-angle X-ray diffraction. It is found that samples can undergo either a martensitic transformation to a monoclinic cell, (100) [010] slip or (110) twinning depending upon the orientation of the specimen to the compression direction. A specific orientation relationship has been found between the new monoclinic cell and the parent orthorhombic cell and this has been compared with relationships found by other workers. Stress-strain curves have been obtained from other specimens and it is suggested that for specimens in certain orientations yield may take place by means of a martensitic transformation at a critical resolved shear stress of 14 ± 1 MNm-2.Keywords
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