Room temperature Monte Carlo study of the mechanical properties of thermoplastic polymers

ABSTRACT: he effect of the tensile test rate upon the mechanical properties of semicrystalline high-density polyethylene (HDPE) is studied by the Monte Carlo method. A two-dimensional lattice model is used, which considers first and second neighbour’s interactions between CH2-CH2 groups. Metropolis dynamics is implemented as energy minimization tool. Results reveal the existence of two distinguishable regions in the stress-strain curves. One of them is characterized by an elastic and linear behaviour below 0.27% of deformation where the elastic modulus is practically insensitive to the number of Monte Carlo steps, whereas at higher deformation the system exhibits a non-linear behaviour ascribed to the viscoelastic character of the material endorsed by a clear dependence of the relaxation modulus as a function of the strain rate. The relaxation behaviour of HDPE obtained in our simulation shows an exponential decrease of the stress as time increases, which agrees with experimental data.

• Autores: Ospina Salgado, Silvio Alberto; López Osorio, Betty Lucy; Hess, Michael
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2004
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/30853
• Acceso en línea: https://hdl.handle.net/10495/30853
• Palabra clave: Método de Montecarlo; Monte carlo method; Termoplásticos; Thermoplastics; Propiedades mecánicas; Mechanical properties; Polietileno; Polyethylene; Semicristalino de alta densidad; Tensión-deformación; http://aims.fao.org/aos/agrovoc/c_4683; http://aims.fao.org/aos/agrovoc/c_28510
• Rights: openAccess
• License: http://creativecommons.org/licenses/by/2.5/co/