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Primerjava časovno odvisnega modula relaksacije različnih materialov z uporabo preproste natezne naprave
Mohorko, Nik (Author), Slemenik Perše, Lidija (Mentor) More about this mentor... This link opens in a new window

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Abstract
V nasprotju s kovinami so mehanske lastnosti polimerov izrazito časovno odvisne. V zaključni nalogi smo obravnavali spreminjanje modula relaksacije polimerov PTFE, PC, PVC, PP, ABS in PA6 s časom pri konstantni deformaciji. V ta namen smo zasnovali preprost natezni stroj s pnevmatskim vpetjem in računalniškim vmesnikom. Pokazali smo, da je spreminjanje modulov relaksacije sledilo predvidenemu obnašanju. Do največjega padca modula relaksacije med časoma t = 1 s in t = 1001 s je prišlo pri polimeru PTFE (39,9 %), do najmanjšega padca pa pri polimeru PC (10,5 %).

Language:Slovenian
Keywords:časovna odvisnost, polimeri, viskoelastičnost, modul relaksacije, natezni stroji
Work type:Final paper (mb12)
Tipology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Year:2019
Views:79
Downloads:33
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Secondary language

Language:English
Title:Comparison of time dependent relaxation modulus of different polymeric materials using a simple tensile testing device
Abstract:
In contrast to metals the mechanical properties of polymers are distinctively time-dependent. In this thesis we studied the relation of relaxation modulus of polymers PTFE, PC, PVC, PP, ABS and PA6 with time when subjected to a constant deformation. For this purpose, we developed a tensile testing device with pneumatic grips and a computer interface. We have concluded that the relaxation modulus-time relation followed the predicted behaviour. The greatest difference between modulus values in t = 1 s and t = 1001 s was observed with PTFE (39,9 %), while the smallest was observed with PC (10,5 %).

Keywords:time-dependence, polymers, viscoelasticity, relaxation modulus, tensile testing devices

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