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Ballistic performance of thermoplastics exposed to impact loading in a wide temperature range : dissertationSaprunov, IvanV tem delu smo raziskovali, kako spreminjanje različnih parametrov vpliva na udarno žilavost polimerov. V sklopu dela je bila analizirana balistična zmogljivost polimernih diskov premera Ø90 mm, ... izdelanih izpolietilena nizke gostote (LDPE), poliamida-6 (PA6) in termoplastičnega poliuretana (TPU), ki smo jih izpostavili udarnim obremenitvam jeklenih izstrelkov v hitrostnem razponu 10-136 m/s. Analizirana je bila balistična meja in udarna žilavost vzorcev treh debelin (2, 4 in 8 mm), za dve različni masi izstrelka(17 in 45 g), dveh različnih oblik konice izstrelka (oster in polkrožen) in pet poljubno izbranih temperatur(-37, 0, 30 , 60 in 90 ° C).Potrjeno je bilo, da hitro povečanje odpornosti proti udarnim obremenitvam ustreza prehodu od krhke k duktilne vrsti odpovedi materiala. Poleg vpliva temperature materiala je prehod iz krhkega k duktilnemu vedenju lahko povzročen s spreminjanjem debeline vzorca in celo mase izstrelka. Ugotovljeno je bilo, da povečanje mase izstrelka povzroči prehod od krhkega k duktilnemu vedenju, kar je nepričakovan in pomemben rezultat. Nazadnje je bila narejena napoved temperaturne odvisnosti udarne žilavosti, ki temelji na poznavanju (i)temeljnih viskoelastičnih lastnosti in uporabe (ii) simulacije udarnega preizkusa z uporabo metode končnih elementov. Obe metodi uporabljata kot primarne vhodne podatke osnovne viskoelastične materialne lastnosti v smislu bodisi časovno- ali frekvenčno-odvisnega strižnega modula in voljnosti. Oba pristopa pa ne omogočata napovedovanja temperaturno odvisnega trenda udarne žilavosti.Type of material - dissertation ; adult, seriousPublication and manufacture - Ljubljana : [I. Saprunov], 2013Language - english, slovenianCOBISS.SI-ID - 13188635
Author
Saprunov, Ivan
Other authors
Emri, Igor
Topics
Polimeri |
Udarna žilavost |
Disertacije |
balistična meja |
krhke porušitve |
viskoelastičnost |
duktilne porušitve |
duktilne porušitve |
polymers |
impact toughness |
ballistic limits |
brittle-to-ductile transitions |
viscoelasticity |
viscoelasticity
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Saprunov, Ivan | 33012 |
Emri, Igor | 04316 |
Source: Personal bibliographies
and: SICRIS
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