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Analysis of stress state in DMTA and photoelasticity examinations

Wybrane pełne teksty z tego czasopisma
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
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.
Rocznik
Strony
39--46
Opis fizyczny
Bibliogr. 27 poz.
Twórcy
autor
  • Department of Polymer Processing and Production Management, Częstochowa University of Technology, Al. Armii Krajowej 19c, 42-200 Czestochowa, Poland, gnatowski@kpts.pcz.czest.pl
Bibliografia
  • [1] J.D. Ferry, Viscoelasticity of Polymers, 1965, WNT, Warsaw (in Polish).
  • [2] C. Koning, M.V. Duin, Ch. Paagnoulle, R. Jerome, Strategies for compatibilization of polymer blends, Progress in Polymer Science 23 (1998) 707-757.
  • [3] J. Koszkul, Polymeric materials, Publication of Technical University of Czestochowa, 1999 (in Polish).
  • [4] A. Gnatowski, J. Koszkul, Investigations of the Influence of Compatibilizer and Filler Type on the Properties of Chosen Polymer Blends, Journal Material Processing Technology 162-163 (2005) 52-58.
  • [5] D. Kwiatkowski, J. Nabiałek, A. Gnatowski, The examination of the structure of PP composites with the glass fibre, Archives of Materials Science and Engineering 28/7 (2007) 405-408.
  • [6] D. Kwiatkowski, J. Nabiałek, P. Postawa, Influence of injection moulding parameters on resistance for cracking on example of PP, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 97-100.
  • [7] R. Sikora, Multiparticle plastics. Types, properties and the structure, Technical University of Lublin, 1991 (in Polish).
  • [8] J. Campoy, J.M. Arribas, U.M. Zaporta, Crystallization kinetics of polypropylene-polyamide compatibilized blends, European Polymer Journal 31/5 (1995) 475-480.
  • [9] J. Koszkul, O. Suberlak, Physical chemistry and polymer properties base, Publication of Czestochowa University of Technology, 2001 (in Polish).
  • [10] J. Koszkul, E. Bociąga, D. Kwiatkowski, Dynamical properties of polyacetale composites with microspheres from fly - ashes, Polymer Processing Society North American Meeting, Toronto, Ontario, Canada, 1998, 72-73.
  • [11] D. Kwiatkowski, Determination of crack resistance on the basis of the J integral for talc filled PP and PA composites, Proceedings of the 13th International Scientific Conference „Achievements in Mechanical and Materials Engineering” AMME’2005, Gliwice - Wisla, 2005, 391-394.
  • [12] J. Nabiałek, D. Kwiatkowski, Investigations of the plastics flow during the injection molding process - selected results, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 225-228.
  • [13] E. Bociaga, T. Jaruga, Dynamic mechanical properties of parts from multicavity injection mould, Journal of Achievements in Materials and Manufacturing Engineering 23/2 (2007) 83-86.
  • [14] P. Postawa, A. Szarek, Analysis of changes in bone cement damping factor and its effect on bone load, Journal of Achievements in Materials and Manufacturing Engineering 23 (2007) 35-38.
  • [15] L.A. Dobrzański, A. Neimitz, Fracture mechanics, PWN Academic Publishers, Warsaw, 1998 (in Polish).
  • [16] P. Postawa, D. Kwiatkowski, Residual stress distribution in injection molded parts, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 171-174.
  • [17] J. Koszkul, J. Nabiałek, Selected methods of modelling of polymer during the injection moulding process, Journal of Achievements in Materials and Manufacturing Engineering 24/1 (2007) 253-259.
  • [18] A. Fazal, M. Arif, Numerical prediction of plastic deformation and residual stresses induced by laser shock processing, Journal of Materials Processing Technology 136 (2003) 120-138.
  • [19] S.B. Singh, S. Ray, Newly proposed yield criterion for residual stress and steady state creep in an anisotropic composite rotating disc, Journal of Materials Processing Technology 143-144 (2003) 623-628.
  • [20] P. Postawa, A. Szarek, J. Koszul, DMTA method in determining strength parameters of acrylic cements, Archives of Materials Science and Engineering 28/5 (2007) 309-312.
  • [21] M.C. Senake Perera, U.S. Ishiaku, Z.A. Mohd. Ishak, Characterisation of PVC/NBR and PVC/ENR50 binary blends and PVC/ENR50/NBR ternary blends by DMA and solid state NMR, European Polymer Journal 37 (2001) 167-178.
  • [22] A. Gnatowski, J. Koszkul, Investigation on PA/PP Mixture Properties by Means of DMTA Method, Journal of Materials Processing Technology 175 (2006) 212-217.
  • [23] J. Koszkul, J. Nabiałek, Viscosity models in simulation of the filling stage of the injection molding process, Journal of Materials Processing Technology 157-158 (2004) 183-187.
  • [24] J. Koszkul, J. Nabiałek, The influence of viscosity model on the results of injection molding process, Proceedings of the 9th Scientific International Conference „Achievements in Mechanical and Materials Engineering” AMME’2000, Gliwice - Sopot - Gdańsk, 2000, 311-314.
  • [25] T.D. Papathanasiou, M.R. Kamal, Filling of a Complex-Shaped Mold with a Viscoelastic Polymer. Part I: The Mathematical Model, Polymer Engineering and Science 33 (1993) 400-409.
  • [26] E. Bociąga, T. Jaruga, J. Koszkul, Plastic Flow Investigation in Multicavity Injection Mold, Proceedings of the 12th International Scientific Conference „Achievements in Mechanical and Materials Engineering” AMME’2003, Gliwice - Zakopane, 2003, 107-110.
  • [27] R. Sikora, Basics of Polymer Processing, Lublin usiversity of Technology Publishers, Lublin, 1992, 501.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BSL8-0040-0015
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