An experimental and analytical study of the large strain response of glassy polymers with a noncontact laser extensometer

✍ Scribed by G. Spathis; E. Kontou

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 179 KB
• Volume: 71
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990321)71:12<2007::aid-app10>3.0.co;2-w

✦ Synopsis

The yield behavior of an amorphous glassy polymer has been studied with true tensile stress-strain curves, obtained at various crosshead speeds by means of a new experimental method. A constitutive equation from nonlinear viscoelasticity has been used, with the further assumption that the material, during deformation, subsequently follows the following two distinct paths: a nonlinear viscoelastic, and a plastic one. The maximum strain, where this distinction is manifested, has been treated as a control parameter, while the strain rate was experimentally evaluated. The decomposition of deformation has been made with a suitable kinematic formulation, proposed in the literature. The theoretical results describe the experimental curves in detail.