ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The deformation of samples of oriented high-density polyethylene has been analysed in terms of three principal deformation mechanisms,fibrillar slip, lamella slip andchain slip. From a study of small- and wide-angle X-ray diffraction patterns it is possible to deduce which mechanism or mechanisms are operating in particular cases. Material prepared in three different ways has been examined and it appears that in all three cases the primary mechanism for plastic deformation is [001] chain slip. In oriented and annealed material with a well-defined lamella crystal structure it has been possible to show that the recoverable elastic deformation is primarily due to reversible lamella slip. In this material plastic deformation by chain slip starts at a well-defined critical resolved shear stress of about 15 MNm−2. Deformation of oriented unannealed material, in which the crystal structure is not so well-defined, appears to be more complicated. In material prepared by cold drawing some of the plastic strain may be accounted for by permanent lamella slip. Fibrillar slip does not appear to be a major deformation mechanism in any of the three materials.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00755579
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