Experimentally evaluating the equilibrium stress in shear of glassy polycarbonate

Article Abstract:

A thermodynamic theory for characterizing the response of glassy polymers is developed, which is based on evaluating the slope of stress-strain response under conditions of similar elastic and plastic strain, but different strain rates. Results of evaluation of the plastic strain rate and back stress at room temperature for polycarbonate using the method reveal that they match well with results obtained by direct probing of the equilibrium stress and the method provides a map of plastic strain rate and tangent modulus over a large range of loading conditions.

Polycarbonate Resins, Thermodynamics, Polycarbonates

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Loading history effects on the creep and relaxation behavior of thermoplastics

Article Abstract:

Experimental investigations were performed to understand the effects of prior loading on the creep and stress relaxation behavior of an amorphous polymer (polyphenylene oxide) and a semi-crystalline polymer (high density polyethylene) at room temperature. Preliminary attempts at modeling the aforementioned creep and relaxation behavior were made by modifying the existing formulation of the viscoplasticity theory based on overstress, which is a constitutive state-variable based model.

Science & research, Polyethylene, High Density, Research, Viscoelasticity, High density polyethylene

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Large strain mechanical behavior of poly (methyl methacrylate) (PMMA) near the glass transition temperature

Article Abstract:

The large strain mechanical behavior of poly(methyl methacrylate) (PMMA) was investigated using uniaxial compression tests at varying temperatures and strain rates. The results reveal that the three-dimensional constitutive model is able to successfully capture the observed stress-strain behavior of PMMA, including the initial elastic modulus, flow stress, initial strain hardening and dramatic strain hardening in uniaxial compression near the glass transition temperature.

Polymethyl Methacrylate, Models, Polymethylmethacrylate

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