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Biaxial yielding of polypropylene/elastomeric polyolefin blends: Effect of elastomer content and thermal annealing
Author(s) -
Fasce Laura A.,
Pettarin Valeria,
Marano Claudia,
Rink Marta,
Frontini Patricia M.
Publication year - 2008
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21107
Subject(s) - materials science , polyolefin , polypropylene , composite material , elastomer , von mises yield criterion , polymer , annealing (glass) , structural engineering , layer (electronics) , finite element method , engineering
The yield behavior of commercial homopolymer polypropylene modified by elastomeric metallocene‐catalyzed polyolefin blends was investigated by carrying out uniaxial tension, uniaxial compression, plane strain compression, and simple shear mechanical tests. Investigation was performed using specimens machined from isotropic compression molded plates. The onset of yielding was determined by means of the residual strain method. Experimental data was fitted according to the two most popular yield criteria in the polymer field—modified Tresca and modified Von Mises criteria. Both criteria provided reasonable predictions of the yield onset locus despite the tendency of polymers to develop crazes under positive hydrostatic pressure. A generalized yield locus based on the modified Von Mises criterion and the Lazzeri and Bucknall relationship was constructed for PP/POE blends. In addition, for one blend composition the effect of the polypropylene matrix crystalline morphology—altered by thermal annealing—was investigated. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers.