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Polymeric metamaterials with advanced mechanical properties Štaffová, Martina ; Lehocký,, Marian (referee) ; Kotoul, Michal (referee) ; Jančář, Josef (advisor) Práce se zabývá 3D tištěnými polymerními auxetickými strukturami s důrazem na jejich mechanické vlastnosti. Pro zlepšení mechanických vlastností, zejména poměru schopnosti absorpce energie k hmotnosti při tlakovém zatížení, byly použity různé návrhy auxetických re-entrantních struktur. Struktury byly vytištěny pomocí stereolitografické 3D tiskárny. Byl vyvinut a systematicky demonstrován nový nástroj pro komplexní charakterizaci 3D tištěných těles s využitím komerční fotopolymerizační pryskyřice s volnými radikály. Metoda se opírá o statický a oscilační mechanický test kombinující měření teploty průhybu při zatížení (HDT) s dynamickou mechanickou analýzou (DMA) v jediném testu pro rychlou a spolehlivou charakterizaci parametrů určujících chování fotopolymeru při vytvrzování. Byly zkoumány podmínky tisku a doba vytvrzení, aby byl objasněn jejich vliv na vnitřní napětí v 3D tištěných tělesech. Auxetické struktury byly vytištěny pomocí flexibilní a tuhé pryskyřice a byl zkoumán vliv poréznosti, velikosti buněk a strukturálních gradientů na mechanické vlastnosti. Výsledky byly vyhodnoceny z konstrukčního a materiálového hlediska pro fotopryskyřice nad a pod Tg. Nejlepší účinnost absorbování energie byla zjištěna u biaxiálně orientované struktury s nejvyšší lokální porozitou umístěnou ve středu. Prezentovaná data přispívají k základnímu pochopení účinků designu buněk na deformační odezvu auxetických struktur a mohou pomoct při návrhu nových struktur s lepšími mechanickými vlastnostmi. Výsledky zároveň demonstrují všestrannost 3D tisku při realizaci komplexních, přírodou inspirovaných struktur. Detailed record

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