Treść książki
Przejdź do opcji czytnikaPrzejdź do nawigacjiPrzejdź do informacjiPrzejdź do stopki
Preface
Laminateswiththermosettingmatrices(resins)reinforcedwithstitchedglass-
carbonfabricshavebeenwidelyusedinaerospace,space,automotive,civil,me-
chanical,marine,andnavalconstructionsfordecades.Inthedesignstandardsfor
suchconstructions,relativelylowstresslevelsleadingtolinearlyelastic/viscoe-
lasticreversibleprocessesareallowed.Effectsofviscoelasticpropertiesoflami-
nates,temperaturechangesandmaterialagingaretakenintoaccountbyrelatively
highsafetyfactorsspecifiedinrelevantstandards.Developmentofrheological
modellingofthermosettingpolymersandfibre-reinforcedthermosetmatrixcom-
positeswillallownewalgorithmsforthedesignoflaminateshellconstructionsto
beformulatedandimplementedtothedesigncodes.
Thisbookdevelops,uniqueworldwide,anadvancedanalyticalrheological
modellingofthermosettingpolymers(thermosets)andunidirectionalmonotropic
(transverselyisotropic)fibre-reinforcedthermosetmatrix(UFRT)composites.In
engineeringpractice,aUFRTcompositeisalayeroflaminatesreinforcedwith
stitchedfabrics.New(unaged)polymersandcompositesundernormalconditions
(temperature200C,humidity50%),fullyrelaxedfromcuringandpost-curing
stressesareconsidered.Thetheoryincludesquasi-staticshort-term/medium-term
/long-termreversiblerheologicalprocesses.Accordingtoexistingknowledge,
thermosetsaremodelledasisotropicmaterialsexhibitinglinearlyviscoelastic
shearstrainsandlinearlyelasticbulkstrains,andthefibresarelinearlyelastic
isotropic/monotropicmaterials.
ExperimentalstudiesaroundtheworldoverthepastdecadesshowthataMit-
tag-Lefflerfractionalexponentialfunctionisanadequategenericfunctionre-
producingtheviscoelasticcharacteristicsofthermosets.Anintegralformofthis
function,appliedbytheauthors,enabledformulationofanewmethodologyfor
rheologicalmodellingofboththermosetsandUFRTcomposites.Coupledandun-
coupled,standardandinverseconstitutiveequationsoflinearelasticityandrheol-
ogy,mutuallyanalyticallytransformable,areformulatedforthermosetsandUFRT
composites.Newrheologicalmodels(codedasH-R/H)forthermosetsandUFRT
compositesaredescribedbythesmallestpossiblenumbersoftheviscoelasticcon-
stants.Anisotropicthermosetisdescribedbytwoindependentelasticconstants
andthreeindependentviscoelasticconstants.AhomogenizedmonotropicUFRT
