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Title: On the machinability of composite materials

Orthogonal cutting tests were carried out on a unidirectional Carbon Fibre Reinforced Plastic (CFRP), a unidirectional Glass Fibre Reinforced Plastic (GFRP), and a Sheet Moulding Compound (SMC) R50, using high speed steel tools. The force data were interpreted in the light of the usual force scheme adopted in metal cutting, disregarding the forces developing at the tool flank. It was found that, similarly to metals, the unit cutting force depends on the depth of cut t, decreasing with increasing the latter (size effect). The same trend was followed by the coefficient of friction. A new force scheme, previously proposed for composites, together with a different definition of {open_quotes}specific energy{close_quotes}, was then applied. Irrespective of the material considered, the new model results in a coefficient of friction independent of the cutting parameters, and in a specific energy X unaffected by the depth of cut. Nevertheless, X strongly decreases with increasing the rake angle, following different trends for CFRP and GFRP. Amongst the materials tested, the poorest machinability pertains to SMC.
Authors:
; ; ;  [1]
  1. Univ. of Naples Federico II, Naples (Italy)
Publication Date:
OSTI Identifier:
501752
Report Number(s):
CONF-961239--
TRN: 97:002725-0042
Resource Type:
Conference
Resource Relation:
Conference: IDPT-2: 2. world conference on integrated design and process technology, Austin, TX (United States), 1-4 Dec 1996; Other Information: PBD: 1996; Related Information: Is Part Of Integrated design and process technology. Volume 3; Esat, I.I.; Veniali, F.; Rasty, J.; Gransberg, D.D.; Ertas, A. [eds.]; PB: 407 p.
Publisher:
Society for Design and Process Science, Austin, TX (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; COMPOSITE MATERIALS; CUTTING; REINFORCED PLASTICS; TESTING; MATHEMATICAL MODELS