Czynniki warunkujące rozwój delaminacji wewnętrzych w laminatach polimerowych

Czarnocki, P.

Artykuł - szczegóły

Tytuł artykułu

Czynniki warunkujące rozwój delaminacji wewnętrzych w laminatach polimerowych

Autorzy

Czarnocki P.

Identyfikatory

Warianty tytułu

Factors affecting propagation of buckling delaminations

Języki publikacji

Abstrakty

Praca składa się z sześciu rozdziałów uzupełnionych czterema dodatkami. W rozdziale l przedstawiono, istotne dla omawianych zagadnień, cechy kompozytów polimerowych o budowie warstwowej (laminatów) oraz charakterystyczne cechy mechanizmu ich rozwarstwiania. Rozdział 2 jest poświęcony zagadnieniom wyznaczania wartości krytycznych współczynnika uwalniania energii (WUE) w odniesieniu do rozwarstwiania laminatów. Część pierwsza rozdziału zawiera omówienie głównych, stosowanych w tym przypadku metod i opiera się na studiach literaturowych. Część druga rozdziału dotyczy zagadnienia niepożądanych deformacji wtórnych próbek i przedstawia wyniki prac własnych autora. Rozdział 3 dotyczy czynników wpływających na odporność laminatu na rozwarstwianie. Częściowo treść rozdziału jest wynikiem studiów literaturowych. Wyniki prac własnych przedstawiono w podrozdziale 3.5. Dotyczą one zmian wartości krytycznych WUE, w przypadku wzmocnienia w postaci tkanin, zależnie od konfiguracji wzmocnienia względem kierunku rozwoju delaminacji oraz zależnie od sposobu pękania. Rozdział 4 zawiera wyniki badań fraktograficznych umożliwiających wyjaśnienie mechanizmów rozpraszania energii biorących udział w procesie delaminacji. W części pierwszej rozdziału, opierając się na własnej dokumentacji fraktograficznej i studiach literaturowych, przedstawiono elementarne mechanizmy rozpraszania energii. Podrozdział 4.4 zawiera dorobek własny autora. Przedstawiono w nim mechanizmy rozpraszania energii w przypadku wzmocnienia w postaci tkanin i zawarto propozycję wyjaśnienia przyczyn stosunkowo wysokiej odporności takiego laminatu na rozwarstwianie. Rozdział 5 dotyczy badania możliwości rozwoju rozwarstwień w aspekcie ich geometrii oraz właściwości sprężystych warstw laminatu ulegających separacji. Przedstawiono w nim problematykę wyznaczania składowych WUE (separacji warunków I i II sposobu pękania), modelowania delaminacji, a także wpływu geometrii odwarstwienia oraz zmian relacji stałych sprężystości odwarstwienia i laminatu macierzystego na proporcje i wartości składowych WUE. Wyniki prac własnych autora zawierają podrozdziały 5.3 do 5.6, które dotyczą dwu ostatnich czynników. Pracę zamyka rozdział 6 zawierający podsumowanie i propozycję kierunków dalszych badań. Uzupełnieniem pracy są cztery dodatki. Pierwszy zawiera wyniki analizy różnic w wartościach krytycznych GIc, GIIc i kąta fazowego zależnie od formuły obliczeniowej stosowanej do opracowania wyników pomiarów. Drugi zawiera informacje dotyczące próbek zaprojektowanych przez autora i wykorzystanych do badań przedstawionych w podrozdziale 3.5 oraz wyniki tych badań. Trzeci zawiera informacje dotyczące geometrii analizowanych delaminacji, proporcji stałych sprężystości materiałów odwarstwienia i laminatu macierzystego oraz geometrii siatki elementów skończonych wykorzystywanych w badaniach własnych, przedstawionych w podrozdziałach 5.3-5.6, oraz wybrane szczegółowe wyniki tych badań. Ostatni zawiera porównanie wyników niektórych badań numerycznych i eksperymentalnych wykonanych przez autora.

The work presented covers problems of delaminations embedded in polymeric laminates reinforced with continuous fibers. The text is presented in six chapters. The first chapter reviews the basic nature of laminates and delamination phenomenon. The second one presents methods used for characterizing resistance of laminates against delamination as well as comparison of various data reduction methods. Also, numerical analysis of the effects of the specimens secondary deformations on the Fracture Modes variation along the delamination fronts in Mode I and Mode II tests is included. The third chapter deals with the effects of various factors affecting delamination resistance of laminates. Particular emphasis is put on the effects resulting from the reinforcement arrangement. This chapter is supplemented by Chapter 4 containing the fractographic evidences that explain relatively high delamination resistance of laminates reinforced with fabrics. Chapter 5 contains the results of the numerical analysis concerning the effects of the mechanical properties of laminate layers, geometry of buckling delaminations and thermal deformations on the magnitude and distribution of the Strain Energy Release Rate, (SERR), components along the delamination boundaries. Also, a short description of the mode separation procedures is included. Chapter 6 contains conclusions and suggestions for further research.

Słowa kluczowe

kompozyt polimerowy laminat polimerowy delaminacja wewnętrzna wytrzymałość materiałów badania materiałów

polymer composite polymer laminate internal delamination strength of materials material testing

Wydawca

Oficyna Wydawnicza Politechniki Warszawskiej

Czasopismo

Prace Naukowe Politechniki Warszawskiej. Mechanika

Rocznik

2005

Tom

z. 210

Strony

3--142

Opis fizyczny

Bibliogr. 212 poz., rys., tab., wykr.

Twórcy

autor

Czarnocki P.

Instytut Techniki Lotniczej i Mechaniki Stosowanej Politechniki Warszawskiej

Bibliografia

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