Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 448, Issue 1-2, Pages 56-66Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.11.100
Keywords
annealing; local hydrostatic stress; PVDF; secondary crystallization; macroscopic triaxiality
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The relative influence of microstructure on mechanical behaviour and cavitation in a semi-crystalline polymer is studied here and compared to the macroscopic triaxiality effect induced by the sample shape. Microstructure effects result from process or annealing. In the later case, DSC and DMA experiments show secondary crystallization, homogenization of primary crystals and decrease of the amorphous phase mobility. Samples shapes exhibiting more or less macroscopic triaxiality are tested in tension before and after annealing at high temperature. More cavitation is observed after annealing-or in slowly cooled down materials-in weakly triaxial structures (dumbbell specimens or diabolo specimens with a large curvature radius). In highly triaxial samples (diabolo specimens with a small curvature radius) no difference are observed between as-received and annealed samples: the macroscopic hydrostatic stress is then of major importance compared to the raise of local hydrostatic stress within the amorphous layer resulting from high-temperature annealing. (c) 2006 Published by Elsevier B.V.
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