Plastic Deformation of the γ Phase Isotactic Polypropylene in Plane−Strain Compression at Elevated Temperatures

2007 ◽  
Vol 40 (14) ◽  
pp. 4933-4941 ◽  
Author(s):  
E. Lezak ◽  
Z. Bartczak
Keyword(s):  
Plastic Deformation ◽  
Plane Strain ◽  
Isotactic Polypropylene ◽  
Elevated Temperatures ◽  
Plane Strain Compression

Durability of Graphite Films in Plastic Deformation

1975 ◽  
Vol 97 (2) ◽  
pp. 289-294 ◽  
Author(s):  
J. A. Schey ◽  
A. H. Lonn
Keyword(s):  
Plastic Deformation ◽  
Plane Strain ◽  
Solid Lubricant ◽  
Plane Strain Compression ◽  
Sensitive Indicator ◽  
Force Measurements ◽  
Ring Compression ◽  
Tool Surface ◽  
Edge Profile ◽  
Repeated Contact

The ability of solid lubricant (graphite) films to withstand repeated contact with a deforming cold or hot aluminum workpiece was investigated by three techniques. Ring compression very readily indicated the gradual wear of the film, but sliding at the interface was limited and tendencies to tool pick-up did not show up. Plane strain compression was much more useful in this respect; changes in the edge-profile of the compressed zone proved to be a sensitive indicator of friction, obviating the need for force measurements. Twist compression imposed the most severe conditions. In all instances, a sandblasted tool surface provided better lubricant retention than a polished one.

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