Opis deformacji plastycznej metali z efektami mikropasm ścinania

Pęcherski, R. B.

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Opis deformacji plastycznej metali z efektami mikropasm ścinania

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Pęcherski R. B.

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Abstrakty

Na podstawie analizy aktualnego stanu badań na temat hierarchii procesów poślizgu, zlokalizowanych form odkształcenia plastycznego w monokryształach, fizycznej natury wielopozionowej hierarchii pasm ścinania oraz ich efektów w polikryształach - przedstawiono motywację fizykalną i podstawy heurystyczne proponowanego opisu teoretycznego. Sformułowano nowe hipotezy: o rozszerzeniu pojęcia reprezentatywnego elementu objętości, o obwiedni stanów plastycznych z mikropasmami ścinania (obwiedni mikropasm ścinania), o efekcie naroża plastycznego. Analizując problem uwzględnienia efektów mikropasm ścinania w kontynualnym opisie odkształcenia plastycznego, zaproponowano nowy model prędkości odkształcenia postaciowego generowanego przez mikropasma ścinania oraz określono makroskopowe miary gradientu prędkości, prędkości deformacji plastycznej oraz spinu plastycznego jako efekt uśrednienia po reprezentatywnym elemencie objętości przeciętym osobliwą powierzchnią ścięcia. Zaproponowano nowy opis konstytutywny plastyczności z efektami mikropasm ścinania w postaci modelu materiału sprężysto-plastycznego z dwiema powierzchniami granicznymi. Na zakończenie przedstawiono przykład identyfikacji proponowanego modelu płynięcia plastycznego z udziałem mikropasm ścinania. Wykorzystując dostępne wyniki obserwacji doświadczalnych dla próby kanalikowej, wykonano obliczenia numeryczne tego problemu z zastosowaniem programu elementów skończonych ABAQUS. Otrzymano poszukiwaną zależność opisującą zmianę udziału mikropasm ścinania w prędkości odkształcenia postaciowego w czasie procesu deformacji plastycznej.

Słowa kluczowe

mechanika ośrodków ciągłych plastyczność metali lepkoplastyczność fizyczne własności metali mechaniczne własności metali

plasticity viscoplasticity

Wydawca

Instytut Podstawowych Problemów Techniki PAN

Czasopismo

Prace Instytutu Podstawowych Problemów Techniki PAN

Rocznik

1998

Tom

nr 2

Strony

1--125

Opis fizyczny

Bibliogr. 248 poz., rys., wykr.

Twórcy

autor

Pęcherski R. B.

Ośrodek Mechaniki i Informatyki Stosowanej Instytutu Podstawowych Problemów Techniki PAN w Warszawie

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