Overview

Original Research

MODELING OF THE RELAXATION BEHAVIOR OF POLYPROPYLENE SHORT/FLAX FIBER INJECTED BIO COMPOSITES

H. OURCHID 1, M. BENHADOU 2, L. SAFRAOUI 3, A. HADDOUT 4, and B. BENHADOU 5.

Vol 18, No 04 ( 2023 )   |  DOI: 10.17605/OSF.IO/REQXC   |   Author Affiliation: Industrial Management and Plastics Forming Technology Team, Mechanics, Engineering and Innovation Laboratory, LM2I- National High School of Electricity and Mechanics -ENSEM- Hassan II University Casablanca- Morocco 1,2,3,4; International University of Casablanca, Morocco 5.   |   Licensing: CC 4.0   |   Pg no: 368-377   |   Published on: 12-04-2023

Abstract

In this paper, we present an extensive study on the relaxation behavior at different temperatures of parts injected in polypropylene/short flax fibers, as a function of the mold temperature and the fiber content. These made it possible to model and predict the long-term relaxation behavior of thermoplastic bio-composites. We proposed a generalized third order maxwell rheological model; involving three characteristic times describing the short, medium and long term relaxation times. A phenomenological approach was used by coupling the rheological model with the STT time-temperature superposition principle to predict the long-term relaxation behavior. A comparative study with the experimental results has been performed.

Keywords

bio composites, polypropylene/short flax fibers, injection molding, relaxation, modeling