zaključna naloga Razvojno raziskovalnega programa I. stopnje Strojništvo
Nik Mohorko (Author), Lidija Slemenik Perše (Mentor)

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 %).

Keywords

diplomske naloge;časovna odvisnost;polimeri;viskoelastičnost;modul relaksacije;natezni stroji;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [N. Mohorko]
UDC: 539.3:678:620.172(043.2)
COBISS: 16939547 Link will open in a new window
Views: 973
Downloads: 190
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Other data

Secondary language: English
Secondary title: Comparison of time dependent relaxation modulus of different polymeric materials using a simple tensile testing device
Secondary 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 %).
Secondary keywords: time-dependence;polymers;viscoelasticity;relaxation modulus;tensile testing devices;
Type (COBISS): Final paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za strojništvo
Pages: XIII, [24] f.
ID: 11221969
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