@article {25438,
	title = {\&ldquo;A viscoelastic-viscoplastic model for a thermoplastic and sensitivity of its rheological parameters to the strain-rate\&rdquo;},
	journal = {Frattura ed Integrit{\`a} Strutturale},
	volume = {13 N{\textdegree} 49},
	number = {July 2019},
	year = {2019},
	pages = {666-675},
	abstract = {The behavior of thermoplastics depends on several factors,\&nbsp;mainly time and temperature. The present work is focused on an analysis of\&nbsp;the time sensitivity of the viscoelastic and viscoplastic parameters of a\&nbsp;rheological model. The material considered in this study is a polyamide 6. The\&nbsp;analogical model is represented by the Kelvin-Voigt viscoelastic mechanism\&nbsp;mounted in series with a viscoplastic branch of Bingham. After a\&nbsp;mathematical formulation of the equations governing the model, tensile tests\&nbsp;at different strain rates are conducted. The model parameters are then\&nbsp;identified by inverse analysis. The technique of genetic algorithms has been\&nbsp;favored. A nonlinear dependence of these parameters on the rate of strain has\&nbsp;been observed. The dependence function has been established by a nonlinear\&nbsp;regression technique. The comparison of the experimental results with those\&nbsp;obtained by the model reveals a satisfactory agreement, hence the validation\&nbsp;of the approach adopted.},
	url = {DOI: 10.3221/IGF-ESIS.49.60},
	author = {Youn{\`e}s Saadallah, Semcheddine Derfouf \& Belhi Guerira}
}
