Experimental investigation and modeling of the rate-dependent deformation behavior of PMMA at different temperatures

Comparison between theoretical curves and experimental results of PMMA at different temperatures, and model prediction error. [Display omitted] •Rate-dependent mechanical behavior of PMMA is conducted at different temperatures.•The deformation characteristics of PMMA are discussed at different tempe...

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Bibliographic Details
Published in:European polymer journal 2016-12, Vol.85, p.313-323
Main Authors: Hu, Wenjun, Guo, Hui, Chen, Yongmei, Xie, Ruoze, Jing, Hua, He, Peng
Format: Article
Language:English
Subjects:
Constitutive behavior
Deformation
Error analysis
Mathematical models
Mechanical properties
Nonlinearity
PMMA
Polymethyl methacrylate
Polymethyl methacrylates
Strain rate
Strain rate effect
Stress-strain curves
Stress-strain relationships
Temperature
Temperature effect
Viscoelasticity
Yield strength
Yield stress
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Summary:Comparison between theoretical curves and experimental results of PMMA at different temperatures, and model prediction error. [Display omitted] •Rate-dependent mechanical behavior of PMMA is conducted at different temperatures.•The deformation characteristics of PMMA are discussed at different temperatures.•Variation law of yield stress and strain with temperature and strain rate is analyzed.•A constitutive model describing finite deformation behavior of PMMA is proposed. Numerical and experimental studies on the nonlinear mechanical properties of PMMA under uniaxial compression are conducted over the temperature range of −70°C to 120°C and the strain rate range of 10−4–103/s. The stress–strain curves of PMMA samples are obtained under different strain rates and temperatures, and compressive deformation characteristics of the materials are discussed. The variation law of the yield stress and yield strain with temperature and strain rate is analyzed. The experimental results show the mechanical properties of PMMA in finite deformation are strongly affected by temperature and strain rate. As the temperature increases, the yield stress of PMMA decreases linearly, and the yield strain decreased exponentially. The yield stress of PMMA obviously increases with the increasing of logarithmic strain rate, and shows the characteristics of bilinear relation. Based on the thermodynamic derivation methods, a thermo-viscoelastic constitutive model describing the nonlinear stress-strain behavior of PMMA is proposed in this paper. The model takes into account the coupling effects of strain rate and temperature. The experimental verification and error analysis show that the model is capable of accurately representing the nonlinear stress-strain behavior of PMMA at different strain rates and temperatures.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2016.10.036