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1 2010

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Analysis of stress state in DMTA and photoelasticity examinations

Gnatowski A., Palutkiewicz P., Lubczyńska K.

Archives of Materials Science and Engineering

2010

Vol. 46, nr 1

39-46

Purpose: Determination of stresses at the change of Young modulus values in temperature function for polystyrene samples, by DMTA and photoelasticity method, was the aim of work. The numerical simulations of stress, strain and displacement in PS samples was presented. The numerical simulations of injection moulding process (using Moldflow Plastic Insight 5.0 software), include effects after injection process were conducted. Design/methodology/approach: Investigations were carried out for samples subjected to the one-axial bending. The computer simulations of changes of the stress and strain distribution within the range of elastic strains phase were done. The change in the value of the dynamic Young modulus and the mechanical loss tangent in function of temperature and oscillation frequency by the DMTA method was determined. To verify numerical simulation the photoelasticity research was done. Findings: Examinations made possible the determination of dynamic mechanical properties of polystyrene and changes in the stress distribution during the dynamic loading of the sample in function of temperature. Higher values of the Young modulus were observed within the range of elasticity. The stress increased with the increase in Young modulus, at the strain generated from push rot oscillation Research limitations/implications: The injection moulded part have large internal stresses, with higher value than stresses made from oscillation pushrot. The accuracy of used approximate method for computer simulations was not sufficient to indicate the Bielajew point. Practical implications: Investigated polymer is characterized by viscoelastic properties, so all indicators of the physical and chemical properties depend on not only the time but and also the temperature. Originality/value: To characterize properties of investigated polymer and to estimate the polymer usage in particular conditions, dependences of the storage module and the mechanical losses tangent was determined in function of temperature at the one-axial bending. The impact of internal stresses in the sample was investigate.