Nonlinear creep response of oriented polypropylene tapes. (December 2018)

• Record Type: Journal Article
• Authors: Barkoula, Nektaria M; Alcock, Ben; van Erp, Tim B; Govaert, Leon E; Peijs, Ton
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 232:Number 12(2018)
• Page Start: 987
• Page End: 992
• Publication Date: 2018-12
• Subjects: Mechanical properties -- creep -- self-reinforced polypropylene -- oriented tapes; Materials -- Periodicals; Engineering design -- Periodicals; 620.11
• DOI: 10.1177/1464420716659093
• Languages: English
• ISSNs: 1464-4207

Abstract

The creep response of a highly oriented polypropylene tape used for the manufacture of self-reinforced polypropylene or all-polypropylene composites was studied over a range of stresses and temperatures. Similar to oriented polyethylene, the creep compliance is linear viscoelastic at short loading times, whereas pronounced stress dependence is observed at longer loading times. A mathematical model is proposed, where the total deformation of the fibre is regarded as being composed of a stress-linear delayed elastic component and a nonlinear plastic flow contribution. Model predictions are in good agreement with the experimental data.