Title
Nonlinear analysis of laminated composite plates and shells with delaminations using finite element method
Creator
Marjanović, Miroslav S., 1986-
Copyright date
2016
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Autorstvo-Nekomercijalno-Deliti pod istim uslovima 3.0 Srbija (CC BY-NC-SA 3.0)
License description
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Language
English
Cobiss-ID
Committee report
Theses Type
Doktorska disertacija
description
Datum odbrane: 25. 08. 2016.
Other responsibilities
mentor
Vuksanović, Đorđe, 1951-
mentor
Meschke, Günther.
član komisije
Pujević, Branislav, 1953-
član komisije
Petronijević, Mira, 1952-
član komisije
Lađinović, Đorđe, 1956-
član komisije
Nefovska-Danilović, Marija, 1972-
Academic Expertise
Tehničko-tehnološke nauke
Faculty
Građevinski fakultet
Alternative title
Nelinearna analiza laminatnih kompozitnih ploča i ljuski sa delaminacijama primenom metode konačnih elemenata
Publisher
[M.S. Marjanović]
Format
XIII, 223 lista
description
Gradjevinarstvo - Tehnicka mehanika i teorija konstrukcija / Civil Engineering -Engineering Mechanics and Theory of Structures
Abstract (en)
Laminated composites play an important role in the construction of aircrafts, wind
turbines, ships, cars and other components in mechanical and civil engineering. For
example, the aerospace structures are made of thin-walled cylindrical or spherical
composite shell components having an excellent stiness-to-weight and strength-toweight
ratios. It is also well-known that Fiber Reinforced Polymer strengthening
of the RC beams and slabs give excellent structural results, low time required and
moderate cost. Finally, sandwich plates are widely used in civil engineering as roof
and wall panels to provide the thermal isolation of the buildings. For these reasons,
numerical analysis of laminated composite and sandwich structures attract
the increasing attention of researchers in the various engineering disciplines.
It is very important that perfect bond between the adjacent layers within the
laminate remain intact for the panel to perform on the designed level. However,
the mismatch of material properties between the adjacent layers, along with some
other factors, may cause a delamination that reduces the stiness of the component
and leads to the unexpected structural behavior. To predict the response of damaged
structure, a computational model capable to describe the kinematics of the
delaminated structures is required.
Several limitations of the Equivalent Single Layer (ESL) laminate theories motivated
the researchers to derive the rened (layerwise) plate theories for the analysis
of composite laminates. Therefore, the scope of this study is based on the reduction
of the 3D elasticity problem to a 2D one using the Generalized Laminated Plate Theory
(GLPT) of Reddy, capable to describe the delamination kinematics. The GLPT
became the basis for the development of enriched layered nite elements, which are
applied in the numerical solution of several structural problems. In addition, layered
plate nite elements were applied in the numerical investigation of delaminated
composite shells using the simple transformations presented in this study.
To accurately capture the buckling phenomena of the laminated composites, as
well as for investigation of the in
uence of large rotations on the transient response
of delaminated composite and sandwich plates, the geometric nonlinearity is taken
into account upon the von Karman assumptions. Beside the numerical solution, the
analytical (Navier) solution for linear transient analysis of intact rectangular simply
supported composite plates is provided based on double Fourier series...
Abstract (en)
Laminatni kompoziti igraju vaznu ulogu u izradi aviona, vetrogeneratora, brodova,
automobila i razlicitih elemenata u masinstvu i gradjevinarstvu. Na primer, delovi
kosmickih konstrukcija su izradjeni od tankozidnih cilindricnih ili sfericnih ljuski koje
imaju odlicne odnose krutost-tezina i cvrstoca-tezina. Takodje je dobro poznato da
ojacanje armirano-betonskih greda ili ploca uz pomoc polimera ojacanih vlaknima
daje odlicne rezultate u konstrukcijama, uz mali utrosak vremena i umereno visoku
cenu. Konacno, sendvic ploce se siroko primenjuju u gradjevinarstvu u vidu krovnih
ili fasadnih panela kako bi se obezbedila termicka izolacija zgrada. Iz ovih razloga,
numericka analiza laminatnih kompozitnih i sendvic konstrukcija sve vise privlaci
paznju istrazivaca u razlicitim inzenjerskim disciplinama.
Veoma je vazno da idealna veza susednih slojeva u laminatu ostane neostecena
kako bi se panel ponasao na projektovanom nivou. Medjutim, razlika u materijalnim
osobinama susednih slojeva, uz uticaj nekih dodatnih faktora, moze da izazove
delaminaciju koja smanjuje krutost konstrukcije i dovodi do njenog neocekivanog
ponasanja. Da bi se predvideo odgovor ostecene konstrukcije potreban je numericki
model koji je u stanju da opise kinematiku ploce ili ljuske sa delaminacijom.
Odredjena ogranicenja teorija laminatnih ploca zasnovanih na jednom ekvivalentnom
sloju (ESL) motivisala su istrazivace da razvijaju slozenije (slojevite) teorije
ploca za analizu laminatnih kompozita. Iz ovog razloga, predmet ovog istrazivanja
zasniva se na redukciji trodimenzionalnog problema teorije elasticnosti na dvodimenzionalni
problem primenom Redijeve Opste Laminatne Teorije Ploca (GLPT), koja
je u mogucnosti da opise kinematiku delaminacije. GLPT predstavlja osnovu za
razvijanje slozenih slojevitih konacnih elemenata koji su primenjeni u numerickom
resavanju razlicitih problema. Zatim su slojeviti konacni elementi ploce primenjeni
u numerickom ispitivanju laminatnih kompozitnih ljuski sa delaminacijama,
primenom jednostavnih transformacija koje su prikazane u ovom istrazivanju.
Kako bi se precizno ispitao problem izbocavanja laminatnih kompozita, kao i
za ispitivanje uticaja velikih rotacija na dinamicki odgovor kompozitnih i sendvic
ploca sa delaminacijama, u obzir je uzeta geometrijska nelinearnost bazirana na
von Karman-ovim pretpostavkama...
Authors Key words
laminate, composite plate, composite shell, delamination, GLPT, FEM,
bending, free vibrations, buckling
Authors Key words
laminat, kompozitna ploca, kompozitna ljuska, delaminacija, GLPT,
MKE, savijanje, slobodne vibracije, izbocavanje
Classification
624.04:539.3(043.3)
Type
Tekst
Abstract (en)
Laminated composites play an important role in the construction of aircrafts, wind
turbines, ships, cars and other components in mechanical and civil engineering. For
example, the aerospace structures are made of thin-walled cylindrical or spherical
composite shell components having an excellent stiness-to-weight and strength-toweight
ratios. It is also well-known that Fiber Reinforced Polymer strengthening
of the RC beams and slabs give excellent structural results, low time required and
moderate cost. Finally, sandwich plates are widely used in civil engineering as roof
and wall panels to provide the thermal isolation of the buildings. For these reasons,
numerical analysis of laminated composite and sandwich structures attract
the increasing attention of researchers in the various engineering disciplines.
It is very important that perfect bond between the adjacent layers within the
laminate remain intact for the panel to perform on the designed level. However,
the mismatch of material properties between the adjacent layers, along with some
other factors, may cause a delamination that reduces the stiness of the component
and leads to the unexpected structural behavior. To predict the response of damaged
structure, a computational model capable to describe the kinematics of the
delaminated structures is required.
Several limitations of the Equivalent Single Layer (ESL) laminate theories motivated
the researchers to derive the rened (layerwise) plate theories for the analysis
of composite laminates. Therefore, the scope of this study is based on the reduction
of the 3D elasticity problem to a 2D one using the Generalized Laminated Plate Theory
(GLPT) of Reddy, capable to describe the delamination kinematics. The GLPT
became the basis for the development of enriched layered nite elements, which are
applied in the numerical solution of several structural problems. In addition, layered
plate nite elements were applied in the numerical investigation of delaminated
composite shells using the simple transformations presented in this study.
To accurately capture the buckling phenomena of the laminated composites, as
well as for investigation of the in
uence of large rotations on the transient response
of delaminated composite and sandwich plates, the geometric nonlinearity is taken
into account upon the von Karman assumptions. Beside the numerical solution, the
analytical (Navier) solution for linear transient analysis of intact rectangular simply
supported composite plates is provided based on double Fourier series...
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