简介:Onthebasesofhightemperaturecreepexperiments,theresearchonengineeringapplicationofrheologicalformingiscarriedoutontwokindsoflightmetalalloypartsnamedcylindricalshellofLc4aluminumalloyandvanediskwithcomplexcurvedsurfaceofTC11titaniumalloy.Moreover,themechanicalpropertytestsunderroomandhightemperaturesfortheworkpiecesproducedbythisnewtechniquearealsodone,theresultsshowedthattheyaremuchimprovedevidentlycomparedwiththoseproducedbytraditionalmethod.
简介:Aninvestigationismadeonthesoilpressureinaninecabinopenedbottomellipticalbarrelstructure.Thecalculationmodelsusingthepenetrationofnegativepressuremethodhavebeendeveloped.Thefirstcalculationmodelisisfortheconstructionstageinvolvingthreezones,namely,passive,transitional,andactiveestablishedforthesoilpressureincabins.Theothercalculationmodelisbasedontheusestage,withthetwo(passiveandactive)zonesforthesoilpressureincabins.Theheightofzonesandthetheoreticalanalyticalsolutionsofinnersoilpressurearederived.Theanalyticalformulasofthemodelsareprovedusingthefiniteelementmethodandexperimentaldata,andtheformulasareanalyzedintheinnersoilpressureinthesamecondition.Thecalculationmodelscanbeusedforothermulti-positionstructuraldesignorconstruction.