Constitutive modeling of polycarbonate during high strain rate deformation

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Keivan H Safari (Author) Other; Jamal Zamani (Author) Other; Fernando J Ferreira (Author) Other; Rui M Guedes (Author) FEUP

Journal

Title: Polymer Engineering and Science

Vol. 53

Pages: 752-761

ISSN: 0032-3888

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 18 Citations

Scopus - 23 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

Other information

Authenticus ID: P-005-2DD

DOI: 10.1002/pen.23315

Abstract (EN): A constitutive model is presented for large strain deformation of polycarbonate (PC) at high strain rates (above 102 s1). The proposed model considers the primary process () and the two secondary rate-activated processes ( and ). It is shown that the secondary transitions in the material affect the yield and post yield behavior of the material at high strain rates. The constitutive model has been implemented numerically into a commercial finite element code through a user material subroutine. The experimental results, obtained using a split Hopkinson pressure bar, are supported by dynamic mechanical thermal analysis (DMTA) and DSR (Decompose/Shift/Reconstruct) method. These are employed to gain understanding of the material transitions, and to further the linkages between material viscoelastic, yield, and stressstrain behavior. Comparison of model predictions with experimental data demonstrates the ability of model to capture the characteristic features of stressstrain curve of the material such as initial linear elasticity, global yield, strain softening, and strain hardening at very high strain rates (up to 10,000 s1). POLYM. ENG. SCI. 2013. (c) 2012 Society of Plastics Engineers

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10