11 research outputs found
ΠΠ΅ΡΠΎΠ΄Π° Π·Π° ΠΊΠ°Π»ΠΈΠ±ΡΠΈΡΠ°ΡΠ΅ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈΡ ΠΌΠΎΠ΄Π΅Π»Π° Π·Π° ΡΠΈΠΌΡΠ»ΠΈΡΠ°ΡΠ΅ ΠΏΡΠΎΡΠ΅ΡΠ° ΠΏΡΠ΅ΡΠΎΠ²Π°ΡΠ° ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠΊΠΎΠ³ ΠΏΡΠ°Ρ Π° ΠΊΠΎΡΠΈΡΡΠ΅ΡΠ΅ΠΌ ΠΈΠ½Π²Π΅ΡΠ·Π½ΠΈΡ Π°Π½Π°Π»ΠΈΠ·Π°
Ceramic parts are increasingly produced by compacting loose powders to form, what is
called a βgreenbodyβ, which is further subjected to sintering, to give the final product.
During the sintering stage,the green body undergoes shrinkage inversely proportional to
its density,so defects and even large cracks can appear in the presence of density gradients.
Such circumstanceaffectsthequalityofproductionofceramicparts,withstillelevated
number ofrejectedpieces.
Numerical simulationsofgreenbodyformationareincreasinglyusedasasupportfor
the stable production.Modeling the compaction process usually involves complex
constitutive models with an elevated number of parameters. The current praxis of
evaluating the governing constants relies on a large number of experiments on the green
body,like,Brazilian,crush,triaxialtests etc.Therefore,the model calibration is time
consuming and rather difficult,presenting an obstacle for routine industrial purposes.
To tackle this problem, an alternative procedure based on InverseAnalysis(IA)is
developed, which relies on the data collected from the compaction experimentonly.
Such approach fully eliminates the need for further testing on the green body, making it practicable for routine industrial purposes.Within this methodology,adiscrepancy
function isformedthatquantifiesthedifferencebetweenexperimentalandsimulated
quantities collectedfromthecompactiontest,whichisfurtherminimizedtogivethe
constitutive parameters.Toascertainthestronginfluenceofsoughtparameterson
measurable data,certainnewgreenbodygeometriesaredesigned.
Proposed approachistestedandvalidatedonthecalibrationofβmodifiedβDrucker-
Prager Cap(DPC)model,whichisfrequentlyadoptedforpowderpressingsimulations.
Tothispurpose,rigorousexperimentationinvolvingbothcompactiontestsforcalibration
and destructivetestsforverificationareperformed.TheparametersobtainedthroughIA
are usedtosimulatecomplexgeometries,followedbyacomparativestudybetweenthe
currently adoptedpraxisvs.inverseanalysismethodology.
Further on,calibrationofamoresophisticatedmaterialmodelrelyingonthe
Bigoni-Piccolroaz yieldsurfaceisconsidered.Certaininstabilitiesinthenumerical
implementation of this fairly complex model,lead to discontinuous discrepancy
function, and therefore,parameters are assessed by performing them inimization through
genetic algorithms.Computational burden coming from recursive simulations required
by the genetic algorithm is made consistent by employing controllably βenrichedβ
reduced basis model based on proper orthogonal decomposition. Finally,a comparison
between the novel model and the βmodifiedβ DPCmodel is presented.ΠΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΠ° ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠΊΠΈΡ
ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠΈ Π½Π°ΡΡΠ΅ΡΡΠ΅ ΡΠ΅ ΡΠ°ΡΡΠΎΡΠΈ ΠΈΠ· ΠΏΡΠΎΡΠ΅ΡΠ° ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠΊΠΎΠ³
ΠΊΠΎΠΌΠΏΠ°ΠΊΡΠΈΡΠ°ΡΠ° ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠΊΠΎΠ³ ΠΏΡΠ°Ρ
Π° Ρ ΡΠΈΡΡ Π΄ΠΎΠ±ΠΈΡΠ°ΡΠ° ΠΈΡΠΏΡΠ΅ΡΠΊΠ°, ΠΊΠΎΡΠΈ ΡΠ΅ ΠΏΠΎΡΠΎΠΌ ΠΏΠΎΠ΄Π²ΡΠ³Π°Π²Π° ΡΠΈΠ½ΡΠ΅ΡΠΎΠ²Π°ΡΡ Π½Π° ΠΏΠΎΠ²ΠΈΡΠ΅Π½ΠΎΡ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠΈ. Π£ ΡΠΎΠΊΡ ΡΠΈΠ½ΡΠ΅ΡΠΎΠ²Π°ΡΠ°, Π΅Π²Π΅Π½ΡΡΠ°Π»Π½ΠΎ ΠΏΡΠΈΡΡΡΡΠ²ΠΎ ΡΡΠΏΡΠΈΠ½Π° Ρ ΠΎΡΠΏΡΠ΅ΡΠΊΡ ΠΈΠ·Π°Π·ΠΈΠ²Π° ΠΈΠ½ΡΠ΅Π½Π·ΠΈΠ²Π½ΠΈΡΠ΅ Π»ΠΎΠΊΠ°Π»Π½ΠΎ ΡΠΊΡΠΏΡΠ°ΡΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΡΠ°Π»Π° Ρ ΡΠΎΡ Π·ΠΎΠ½ΠΈ, ΡΡΠΎ Π·Π° ΠΏΠΎΡΠ»Π΅Π΄ΠΈΡΡ ΠΈΠΌΠ° Π½Π΅Ρ
ΠΎΠΌΠΎΠ³Π΅Π½ΠΎΡΡ ΡΠΈΠ½Π°Π»Π½ΠΎΠ³
ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π° ΠΈΠ»ΠΈ ΡΡΠ²Π°ΡΠ°ΡΠ΅ ΡΠ½ΡΡΡΠ°ΡΡΠΈΡ
ΠΏΡΡΠΊΠΎΡΠΈΠ½Π°. Π‘Ρ
ΠΎΠ΄Π½ΠΎ ΡΠΎΠΌΠ΅ ΠΏΠ΅ΡΡΠΎΡΠΌΠ°Π½ΡΠ΅
ΡΠΈΠ½Π°Π»Π½ΠΎΠ³ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π° Ρ Π²Π΅Π»ΠΈΠΊΠΎΡ ΠΌΠ΅ΡΠΈ ΡΡ ΡΡΠ»ΠΎΠ²ΡΠ΅Π½Π΅ ΠΊΠ²Π°Π»ΠΈΡΠ΅ΡΠΎΠΌ ΠΏΡΠΎΠΈΠ·Π²Π΅Π΄Π΅Π½ΠΎΠ³
ΠΎΡΠΏΡΠ΅ΡΠΊΠ°.
ΠΠ½Π°ΡΠ°ΡΠ°Π½ ΡΠ°ΠΊΡΠΎΡ Π·Π° ΡΡΠ°Π±ΠΈΠ»Π½Ρ ΠΈ Π΅ΡΠΈΠΊΠ°ΡΠ½Ρ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡ ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠΊΠΈΡ
ΠΎΡΠΏΡΠ΅ΡΠ°ΠΊΠ°
ΠΏΡΠ΅Π΄ΡΡΠ°Π²ΡΠ° ΠΌΠΎΠ³ΡΡΠ½ΠΎΡΡ ΠΈΠ·Π²ΠΎΡΠ΅ΡΠ° ΡΠ΅Π°Π»ΠΈΡΡΠΈΡΠ½ΠΈΡ
Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠΈΡ
ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ° ΡΠ°ΠΌΠΎΠ³
ΠΏΡΠΎΡΠ΅ΡΠ°. ΠΠΎΠ΄Π΅Π»ΠΈΡΠ°ΡΠ΅ ΠΎΠ²ΠΎΠ³ ΠΏΡΠΎΡΠ΅ΡΠ° Π½Π°ΡΡΠ΅ΡΡΠ΅ ΡΠΊΡΡΡΡΡΠ΅ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½Π΅ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½Π΅
ΠΌΠΎΠ΄Π΅Π»Π΅ ΡΠ° Π²Π΅Π»ΠΈΠΊΠΈΠΌ Π±ΡΠΎΡΠ΅ΠΌ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ°. ΠΡΠΎΡΠ΅Π΄ΡΡΠ΅ ΠΊΠ°Π»ΠΈΠ±ΡΠΈΡΠ°ΡΠ° ΠΎΠ²ΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ°,
ΠΊΠΎΡΠ΅ ΡΡ ΡΡΠ΅Π½ΡΡΠ½ΠΎ Ρ ΠΏΡΠΈΠΌΠ΅Π½ΠΈ,Π·Π°Ρ
ΡΠ΅Π²Π°ΡΡ ΠΈΠ·Π²ΠΎΡΠ΅ΡΠ΅ Π½ΠΈΠ·Π° Π΄Π΅ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΈΡ
ΡΠ΅ΡΡΠΎΠ²Π° Π½Π°
ΠΎΡΠΏΡΠ΅ΡΠΊΡ. ΠΠ²Π°ΠΊΠ°Π² ΠΏΡΠΈΡΡΡΠΏ ΡΠ΅ Π·Π°Ρ
ΡΠ΅Π²Π°Π½ ΠΈ Π½Π΅ΠΏΡΠΈΠ»Π°Π³ΠΎΡΠ΅Π½ Π·Π° ΡΡΡΠΈΠ½ΡΠΊΡ ΠΈΠ½Π΄ΡΡΡΡΠΈΡΡΠΊΡ
ΠΏΡΠΈΠΌΠ΅Π½Ρ.
Π£ ΠΎΠΊΠ²ΠΈΡΡ ΠΎΠ²Π΅ Π΄ΠΈΡΠ΅ΡΡΠ°ΡΠΈΡΠ΅ ΡΠ°Π·Π²ΠΈΡΠ΅Π½Π° ΡΠ΅ Π°Π»ΡΠ΅ΡΠ½Π°ΡΠΈΠ²Π½Π° ΠΌΠ΅ΡΠΎΠ΄Π°,ΡΠ° Π½ΠΈΠ·ΠΎΠΌ
ΠΏΡΠ΅Π΄Π½ΠΎΡΡΠΈ ΠΏΡΠΈ ΡΠ΅ΡΠ°Π²Π°ΡΡ ΠΎΠΏΠΈΡΠ°Π½ΠΎΠ³ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ° ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ°, Π·Π°ΡΠ½ΠΎΠ²Π°Π½Π°
Π½Π° ΠΏΡΠΈΠΌΠ΅Π½ΠΈ ΠΈΠ½Π²Π΅ΡΠ·Π½ΠΈΡ
Π°Π½Π°Π»ΠΈΠ·Π°.Π Π°Π·Π²ΠΈΡΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΠΊΠΎΡΠΈΡΡΠΈ ΠΊΠ°ΠΎ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½Π΅
ΠΏΠΎΠ΄Π°ΡΠΊΠ΅ ΠΈΡΠΊΡΡΡΠΈΠ²ΠΎ ΠΎΠ½Π΅ Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ ΠΊΠΎΡΠ΅ ΡΠ΅ ΠΌΠΎΠ³Ρ ΠΈΠ·ΠΌΠ΅ΡΠΈΡΠΈ Ρ ΡΠΎΠΊΡ ΠΏΡΠΎΡΠ΅ΡΠ° ΡΠ°Π±ΠΈΡΠ°ΡΠ°,
ΡΠΈΠΌΠ΅ ΡΠ΅ ΠΈΡΠΊΡΡΡΠ΅Π½Π° ΠΏΠΎΡΡΠ΅Π±Π° Π·Π° ΡΠΏΡΠΎΠ²ΠΎΡΠ΅ΡΠ΅ΠΌ Π΄Π΅ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΈΡ
ΠΈΡΠΏΠΈΡΠΈΠ²Π°ΡΠ°Π½Π°
ΠΎΡΠΏΡΠ΅ΡΠΊΡ.Π£ ΠΎΠΊΠ²ΠΈΡΡ ΡΠ°Π·Π²ΠΈΡΠ΅Π½Π΅ ΠΌΠ΅ΡΠΎΠ΄Π΅ ΡΠΎΡΠΌΠΈΡΠ°Π½Π° ΡΠ΅ ΡΠΈΡΠ½Π° ΡΡΠ½ΠΊΡΠΈΡΠ° ΠΊΠΎΡΠ°
ΠΊΠ²Π°Π½ΡΠΈΡΠΈΠΊΡΡΠ΅ Π΄ΠΈΡΠΊΡΠ΅ΠΏΠ°Π½ΡΡ ΠΈΠ·ΠΌΠ΅ΡΡ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½ΠΎ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ
,ΠΈ ΠΎΠ΄Π³ΠΎΠ²Π°ΡΡΡΡΠΈΡ
Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠΈ Π΄ΠΎΠ±ΠΈΡΠ΅Π½ΠΈΡ
Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ.Π’Π°ΠΊΠΎ ΡΠ΅ ΠΏΡΠΎΡΠ΅Ρ ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΠ΅ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ° ΡΠ²Π΅Π΄Π΅Π½ Π½Π° ΠΏΡΠΎΠ±Π»Π΅ΠΌ Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠ΅ ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°ΡΠΈΡΠ΅ ΡΠΎΡΠΌΠΈΡΠ°Π½Π΅ ΡΠΈΡΠ½Π΅
ΡΡΠ½ΠΊΡΠΈΡΠ΅.ΠΠ°ΠΊΠΎ Π±ΠΈ ΡΠ΅ ΠΎΠ±Π΅Π·Π±Π΅Π΄ΠΈΠ»Π° ΠΎΠ΄Π³ΠΎΠ²Π°ΡΠ°ΡΡΡΠ° ΠΎΡΠ΅ΡΡΠΈΠ²ΠΎΡΡ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½ΠΎ
ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ
Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ Π½Π° ΡΡΠ°ΠΆΠ΅Π½Π΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ΅ΡΠ΅,Π΄Π΅ΡΠΈΠ½ΠΈΡΠ°Π½Π΅ ΡΡ ΠΏΠΎΡΠ΅Π±Π½Π΅ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ΅
ΠΎΡΠΏΡΠ΅ΡΠ°ΠΊΠ° ΠΊΠ°ΠΎ ΡΠ΅Π·ΡΠ»ΡΠ°Ρ Π΄Π΅ΡΠ°ΡΠ½Π΅ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΡΠΊΠ΅ Π°Π½Π°Π»ΠΈΠ·Π΅.Π’ΠΈΠΌΠ΅ ΡΠ΅ ΡΠΎΡΠΌΠΈΡΠ°Π½
Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ»Π°Π½ΠΈ ΠΏΡΠΎΡΠΎΠΊΠΎΠ» ΠΊΠΎΡΠΈ ΡΠ°ΡΠ½ΠΎ Π΄Π΅ΡΠΈΠ½ΠΈΡΠ΅ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΡ ΠΎΡΠΏΡΠ΅ΡΠ°ΠΊΠ°,ΠΈΠ·Π±ΠΎΡ
Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½ΠΈΡ
Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ,ΠΈ ΠΏΡΠΈΠΌΠ΅Π½Ρ ΠΎΠ΄Π³ΠΎΠ²Π°ΡΠ°ΡΡΡΠΈΡ
Π°Π»Π³ΠΎΡΠΈΡΠ°ΠΌΠ° ΠΈ ΡΠΈΡΡ
Π°ΡΡΠΎΠΌΠ°ΡΡΠΊΠΎΠ³ Π΄ΠΎΠ±ΠΈΡΠ°ΡΠ° ΡΡΠ°ΠΆΠ΅Π½ΠΈΡ
ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ°.
Π Π°Π·Π²ΠΈΡΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠ΅ ΡΠ΅ΡΡΠΈΡΠ°Π½Π° Π½Π° ΡΠ΅ΡΠ°Π²Π°ΡΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ° ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΠ΅ βDrucker-PragerCapβ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΎΠ³ ΠΌΠΎΠ΄Π΅Π»Π°,ΠΊΠΎΡΠΈ ΡΠ΅ ΡΠ΅ΡΡΠΎ ΠΏΡΠΈΠΌΠ΅ΡΡΡΠ΅ Ρ ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ°ΠΌΠ° ΠΏΡΠΎΡΠ΅ΡΠ° ΡΠ°Π±ΠΈΡΠ°ΡΠ° ΠΏΡΠ°Ρ
Π°. Π’Π΅ΡΡΠΈΡΠ°ΡΠ΅ ΡΠ΅ ΡΠΊΡΡΡΠΈΠ»ΠΎ ΠΈ ΠΎΠ±ΠΈΠΌΠ½Ρ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½Ρ ΠΊΠ°ΠΌΠΏΠ°ΡΡ ΠΊΠΎΡΠΈΡΡΠ΅ΡΠ΅ΠΌ Π΄Π΅ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΈΡ
ΡΠ΅ΡΡΠΎΠ²Π° Π½Π° ΠΎΡΠΏΡΠ΅ΡΡΠΈΠΌΠ°, ΡΠΈΠΌΠ΅ ΡΡ Π΄ΠΎΠ±ΠΈΡΠ΅Π½Π΅ ΡΠ΅ΡΠ΅ΡΠ΅Π½ΡΠ½Π΅ Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ, ΡΠΏΠΎΡΡΠ΅Π±ΡΠ΅Π½Π΅ ΠΊΠ°ΠΎ Π±Π°Π·Π° Π·Π° ΠΏΠΎΡΠ΅ΡΠ΅ΡΠ΅. ΠΠΎΠΏΡΠ½ΡΠΊΠ° Π²Π΅ΡΠΈΡΠΈΠΊΠ°ΡΠΈΡΠ° ΡΠ°ΡΡΠΎΡΠ°Π»Π° ΡΠ΅ Ρ ΡΠΈΠΌΡΠ»ΠΈΡΠ°ΡΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΈΡ
Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ°, ΠΊΠΎΡΠΈΡΡΠ΅ΡΠ΅ΠΌ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ° Π΄ΠΎΠ±ΠΈΡΠ΅Π½ΠΈΡ
ΠΏΡΠΈΠΌΠ΅Π½ΠΎΠΌ ΡΠ°Π·Π²ΠΈΡΠ΅Π½Π΅ ΠΌΠ΅ΡΠΎΠ΄Π΅. ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠ΅ ΠΏΡΠΈΠΌΠ΅ΡΠ΅Π½Π° ΠΈ Π½Π° ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΡ ΡΠ»ΠΎΠΆΠ΅Π½ΠΈΡΠ΅Π³ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΎΠ³ ΠΌΠΎΠ΄Π΅Π»Π° ΠΊΠΎΡΠΈ ΠΊΠΎΡΠΈΡΡΠΈ βBigoni-Piccolroazβ ΠΌΠΎΠ΄Π΅Π» ΠΏΠ»Π°ΡΡΠΈΡΠ½ΠΎΡΡΠΈ. ΠΠ²ΠΎ ΠΏΡΠ΅Π΄ΡΡΠ°Π²ΡΠ° Π½ΠΎΠ² ΠΈ ΠΈΠ·ΡΠ°Π·ΠΈΡΠΎ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ°Π½ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈ ΠΌΠΎΠ΄Π΅Π», ΠΏΠ° ΡΠ΅ ΡΠ΅Π³ΠΎΠ²Π° Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠ° ΠΈΠΌΠΏΠ»Π΅ΠΌΠ΅Π½ΡΠ°ΡΠΈΡΠ° ΡΠ΅Π·ΡΠ»ΡΠΈΡΠ°Π»Π° Π½Π΅ΡΡΠ°Π±ΠΈΠ»Π½ΠΈΠΌ Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠΈΠΌ ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ°ΠΌΠ°, ΡΠΈΠ½Π΅ΡΠΈ ΡΠΈΡΠ½Ρ ΡΡΠ½ΠΊΡΠΈΡΡ Π΄ΠΈΡΠΊΠΎΠ½ΡΠΈΠ½ΡΠ°Π»Π½ΠΎΠΌ. ΠΡΠΈ ΡΠ΅ΡΠ°Π²Π°ΡΡ ΠΎΠ²ΠΎΠ³ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ° ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΠ΅, ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°ΡΠΈΡΠ° ΡΠ΅ ΠΈΠ·Π²ΡΡΠ΅Π½Π° ΡΠΏΠΎΡΡΠ΅Π±ΠΎΠΌ βΠ³Π΅Π½Π΅ΡΠΈΡΠΊΠΈΡ
Π°Π»Π³ΠΎΡΠΈΡΠ°ΠΌΠ°β,ΡΠ· ΡΠ°Π·Π²ΠΈΡΠ΅Π½ΠΈ
ΡΠ΅Π΄ΡΠΊΠΎΠ²Π°Π½ΠΈ ΠΌΠΎΠ΄Π΅Π» Π·Π° Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠ΅ ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ΅ ΡΠ΅ΡΡΠ°, ΡΠΈΠΌΠ΅ ΡΠ΅ ΠΏΠΎΡΡΠΈΠ³Π½ΡΡΠΎ Π·Π½Π°ΡΠ°ΡΠ½ΠΎ ΡΠΌΠ°ΡΠ΅ΡΠ΅ ΠΊΠΎΠΌΠΏΡΡΡΠ΅ΡΡΠΊΠΎΠ³ Π²ΡΠ΅ΠΌΠ΅Π½Π° ΠΏΡΠΈΠΈΠ·Π²ΠΎΡΠ΅ΡΡ Π½Π΅Π»ΠΈΠ½Π΅Π°ΡΠ½ΠΈΡ
ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ°. ΠΠ° ΡΠ°ΠΌΠΎΠΌ ΠΊΡΠ°ΡΡ, ΡΠΏΠΎΡΠ΅ΡΠ΅Π½ΠΈ ΡΡ ΡΠ΅Π·ΡΠ»ΡΠ°ΡΠΈ Π΄ΠΎΠ±ΠΈΡΠ΅Π½ΠΈ ΠΏΡΠΈΠΌΠ΅Π½ΠΎΠΌ ΡΠ΅Π΄Π½ΠΎΠ³ ΠΈ Π΄ΡΡΠ³ΠΎΠ³ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΎΠ³ ΠΌΠΎΠ΄Π΅Π»Π° ΡΠ· Π½Π°Π·Π½Π°ΡΠ΅Π½Π΅ ΡΠΌΠ΅ΡΠ½ΠΈΡΠ΅ ΠΎ Π³ΡΡΠΏΠΈ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ° Π½Π° ΠΊΠΎΡΠΈΠΌΠ° ΠΈΡ
ΡΠ΅ ΠΌΠΎΠ³ΡΡΠ΅ ΠΏΡΠΈΠΌΠ΅Π½ΠΈΡΠΈ ΡΠ° Π·Π°Π΄ΠΎΠ²ΠΎΡΠ°Π²Π°ΡΡΡΠΎΠΌ ΡΠ°ΡΠ½ΠΎΡΡΡ
Material model calibration through indentation test and stochastic inverse analysis
Eksperiment instrumentalnog utiskivanja se sve viΕ‘e koristi za karakterizaciju materijala razliΔitog tipa. Razvijene metode kombinuju ovaj test sa kompjuterskom simulacijom u okviru inverznih analiza sa ciljem dobijanja parametara koji ulaze u jednaΔine razliΔitih konstitutivnih modela. Izlaz iz ovakvih procedura predstavljaju vrednosti traΕΎenih parametara u deterministiΔkom smislu, dok je za praktiΔnu inΕΎenjersku upotrebu poΕΎeljno raspolagati i sa procenom taΔnosti dobijenih vrednosti. U ovom radu prikazana je numeriΔko-eksperimentalna metoda zasnovana na inverznoj analizi koja kao ulazni podatak koristi eksperimentalno izmerenu krivu utiskivanja (kriva koja daje zavisnost primenjene sila u funkciji ostvarene dubine utiskivanja). NumeriΔke simulacije testa utiskivanja su znaΔajno ubrzame primenom redukovanog modela zasnovanog na pravilnoj ortogonalnoj dekompoziciji a posebno razvijenom za ovu svrhu. RezultijuΔi inverzni problem je reΕ‘en u stohastiΔkom kontekstu koriΕ‘Δenjem Monte Karlo simulacija kao i Kalmanovih filtera. Dobijeni rezultati su komparativno prezentovani u cilju poreΔenja dobijene taΔnosti i raΔunarske efikasnosti.Indentation test is used with growing popularity for the characterization of various materials on different scales. Developed methods are combining the test with computer simulation and inverse analyses to assess material parameters entering into constitutive models. The outputs of such procedures are expressed as evaluation of sought parameters in deterministic sense, while for engineering practice it is desirable to assess also the uncertainty which affects the final estimates resulting from various sources of errors within the identification procedure. In this paper an experimental-numerical method is presented centered on inverse analysis build upon data collected from the indentation test in the form of force-penetration relationship (so-called 'indentation curve'). Recursive simulations are made computationally economical by an 'a priori' model reduction procedure. Resulting inverse problem is solved in a stochastic context using Monte Carlo simulations and non-sequential Extended Kalman filter. Obtained results are presented comparatively as for accuracy and computational efficiency
Reduced Order Numerical Modeling for Calibration of Complex Constitutive Models in Powder Pressing Simulations
Numerical simulations of different ceramic production phases often involve complex constitutive models, with difficult calibration process, relying on a large number of experiments. Methodological developments, proposed in present paper regarding this calibration problem can be outlined as follows: assessment of constitutive parameters is performed through inverse analysis procedure, centered on minimization of discrepancy function which quantifies the difference between measurable quantities and their computed counterpart. Resulting minimization problem is solved through genetic algorithms, while the computational burden is made consistent with constraints of routine industrial applications by exploiting Reduced Order Model (ROM) based on proper orthogonal decomposition. Throughout minimization, a gradual enrichment of designed ROM is used, by including additional simulations. Such strategy turned out to be beneficial when applied to models with a large number of parameters. Developed procedure seems to be effective when dealing with complex constitutive models, that can give rise to non-continuous discrepancy function due to the numerical instabilities. Proposed approach is tested and experimentally validated on the calibration of modified Drucker-Prager CAP model, frequently adopted for ceramic powder pressing simulations. Assessed values are compared with those obtained by traditional, time-consuming tests, performed on pressed green bodies
Reduced Order Numerical Modeling for Calibration of Complex Constitutive Models in Powder Pressing Simulations
Numerical simulations of different ceramic production phases often involve complex constitutive models, with difficult calibration process, relying on a large number of experiments. Methodological developments, proposed in present paper regarding this calibration problem can be outlined as follows: assessment of constitutive parameters is performed through inverse analysis procedure, centered on minimization of discrepancy function which quantifies the difference between measurable quantities and their computed counterpart. Resulting minimization problem is solved through genetic algorithms, while the computational burden is made consistent with constraints of routine industrial applications by exploiting Reduced Order Model (ROM) based on proper orthogonal decomposition. Throughout minimization, a gradual enrichment of designed ROM is used, by including additional simulations. Such strategy turned out to be beneficial when applied to models with a large number of parameters. Developed procedure seems to be effective when dealing with complex constitutive models, that can give rise to non-continuous discrepancy function due to the numerical instabilities. Proposed approach is tested and experimentally validated on the calibration of modified Drucker-Prager CAP model, frequently adopted for ceramic powder pressing simulations. Assessed values are compared with those obtained by traditional, time-consuming tests, performed on pressed green bodies
Material model calibration through indentation test and stochastic inverse analysis
Eksperiment instrumentalnog utiskivanja se sve viΕ‘e koristi za karakterizaciju materijala razliΔitog tipa. Razvijene metode kombinuju ovaj test sa kompjuterskom simulacijom u okviru inverznih analiza sa ciljem dobijanja parametara koji ulaze u jednaΔine razliΔitih konstitutivnih modela. Izlaz iz ovakvih procedura predstavljaju vrednosti traΕΎenih parametara u deterministiΔkom smislu, dok je za praktiΔnu inΕΎenjersku upotrebu poΕΎeljno raspolagati i sa procenom taΔnosti dobijenih vrednosti. U ovom radu prikazana je numeriΔko-eksperimentalna metoda zasnovana na inverznoj analizi koja kao ulazni podatak koristi eksperimentalno izmerenu krivu utiskivanja (kriva koja daje zavisnost primenjene sila u funkciji ostvarene dubine utiskivanja). NumeriΔke simulacije testa utiskivanja su znaΔajno ubrzame primenom redukovanog modela zasnovanog na pravilnoj ortogonalnoj dekompoziciji a posebno razvijenom za ovu svrhu. RezultijuΔi inverzni problem je reΕ‘en u stohastiΔkom kontekstu koriΕ‘Δenjem Monte Karlo simulacija kao i Kalmanovih filtera. Dobijeni rezultati su komparativno prezentovani u cilju poreΔenja dobijene taΔnosti i raΔunarske efikasnosti.Indentation test is used with growing popularity for the characterization of various materials on different scales. Developed methods are combining the test with computer simulation and inverse analyses to assess material parameters entering into constitutive models. The outputs of such procedures are expressed as evaluation of sought parameters in deterministic sense, while for engineering practice it is desirable to assess also the uncertainty which affects the final estimates resulting from various sources of errors within the identification procedure. In this paper an experimental-numerical method is presented centered on inverse analysis build upon data collected from the indentation test in the form of force-penetration relationship (so-called 'indentation curve'). Recursive simulations are made computationally economical by an 'a priori' model reduction procedure. Resulting inverse problem is solved in a stochastic context using Monte Carlo simulations and non-sequential Extended Kalman filter. Obtained results are presented comparatively as for accuracy and computational efficiency
ΠΠ΅ΡΠΎΠ΄Π° Π·Π° ΠΊΠ°Π»ΠΈΠ±ΡΠΈΡΠ°ΡΠ΅ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈΡ ΠΌΠΎΠ΄Π΅Π»Π° Π·Π° ΡΠΈΠΌΡΠ»ΠΈΡΠ°ΡΠ΅ ΠΏΡΠΎΡΠ΅ΡΠ° ΠΏΡΠ΅ΡΠΎΠ²Π°ΡΠ° ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠΊΠΎΠ³ ΠΏΡΠ°Ρ Π° ΠΊΠΎΡΠΈΡΡΠ΅ΡΠ΅ΠΌ ΠΈΠ½Π²Π΅ΡΠ·Π½ΠΈΡ Π°Π½Π°Π»ΠΈΠ·Π°
Ceramic parts are increasingly produced by compacting loose powders to form, what is
called a βgreenbodyβ, which is further subjected to sintering, to give the final product.
During the sintering stage,the green body undergoes shrinkage inversely proportional to
its density,so defects and even large cracks can appear in the presence of density gradients.
Such circumstanceaffectsthequalityofproductionofceramicparts,withstillelevated
number ofrejectedpieces.
Numerical simulationsofgreenbodyformationareincreasinglyusedasasupportfor
the stable production.Modeling the compaction process usually involves complex
constitutive models with an elevated number of parameters. The current praxis of
evaluating the governing constants relies on a large number of experiments on the green
body,like,Brazilian,crush,triaxialtests etc.Therefore,the model calibration is time
consuming and rather difficult,presenting an obstacle for routine industrial purposes.
To tackle this problem, an alternative procedure based on InverseAnalysis(IA)is
developed, which relies on the data collected from the compaction experimentonly.
Such approach fully eliminates the need for further testing on the green body, making it practicable for routine industrial purposes.Within this methodology,adiscrepancy
function isformedthatquantifiesthedifferencebetweenexperimentalandsimulated
quantities collectedfromthecompactiontest,whichisfurtherminimizedtogivethe
constitutive parameters.Toascertainthestronginfluenceofsoughtparameterson
measurable data,certainnewgreenbodygeometriesaredesigned.
Proposed approachistestedandvalidatedonthecalibrationofβmodifiedβDrucker-
Prager Cap(DPC)model,whichisfrequentlyadoptedforpowderpressingsimulations.
Tothispurpose,rigorousexperimentationinvolvingbothcompactiontestsforcalibration
and destructivetestsforverificationareperformed.TheparametersobtainedthroughIA
are usedtosimulatecomplexgeometries,followedbyacomparativestudybetweenthe
currently adoptedpraxisvs.inverseanalysismethodology.
Further on,calibrationofamoresophisticatedmaterialmodelrelyingonthe
Bigoni-Piccolroaz yieldsurfaceisconsidered.Certaininstabilitiesinthenumerical
implementation of this fairly complex model,lead to discontinuous discrepancy
function, and therefore,parameters are assessed by performing them inimization through
genetic algorithms.Computational burden coming from recursive simulations required
by the genetic algorithm is made consistent by employing controllably βenrichedβ
reduced basis model based on proper orthogonal decomposition. Finally,a comparison
between the novel model and the βmodifiedβ DPCmodel is presented.ΠΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΠ° ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠΊΠΈΡ
ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠΈ Π½Π°ΡΡΠ΅ΡΡΠ΅ ΡΠ΅ ΡΠ°ΡΡΠΎΡΠΈ ΠΈΠ· ΠΏΡΠΎΡΠ΅ΡΠ° ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠΊΠΎΠ³
ΠΊΠΎΠΌΠΏΠ°ΠΊΡΠΈΡΠ°ΡΠ° ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠΊΠΎΠ³ ΠΏΡΠ°Ρ
Π° Ρ ΡΠΈΡΡ Π΄ΠΎΠ±ΠΈΡΠ°ΡΠ° ΠΈΡΠΏΡΠ΅ΡΠΊΠ°, ΠΊΠΎΡΠΈ ΡΠ΅ ΠΏΠΎΡΠΎΠΌ ΠΏΠΎΠ΄Π²ΡΠ³Π°Π²Π° ΡΠΈΠ½ΡΠ΅ΡΠΎΠ²Π°ΡΡ Π½Π° ΠΏΠΎΠ²ΠΈΡΠ΅Π½ΠΎΡ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠΈ. Π£ ΡΠΎΠΊΡ ΡΠΈΠ½ΡΠ΅ΡΠΎΠ²Π°ΡΠ°, Π΅Π²Π΅Π½ΡΡΠ°Π»Π½ΠΎ ΠΏΡΠΈΡΡΡΡΠ²ΠΎ ΡΡΠΏΡΠΈΠ½Π° Ρ ΠΎΡΠΏΡΠ΅ΡΠΊΡ ΠΈΠ·Π°Π·ΠΈΠ²Π° ΠΈΠ½ΡΠ΅Π½Π·ΠΈΠ²Π½ΠΈΡΠ΅ Π»ΠΎΠΊΠ°Π»Π½ΠΎ ΡΠΊΡΠΏΡΠ°ΡΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΡΠ°Π»Π° Ρ ΡΠΎΡ Π·ΠΎΠ½ΠΈ, ΡΡΠΎ Π·Π° ΠΏΠΎΡΠ»Π΅Π΄ΠΈΡΡ ΠΈΠΌΠ° Π½Π΅Ρ
ΠΎΠΌΠΎΠ³Π΅Π½ΠΎΡΡ ΡΠΈΠ½Π°Π»Π½ΠΎΠ³
ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π° ΠΈΠ»ΠΈ ΡΡΠ²Π°ΡΠ°ΡΠ΅ ΡΠ½ΡΡΡΠ°ΡΡΠΈΡ
ΠΏΡΡΠΊΠΎΡΠΈΠ½Π°. Π‘Ρ
ΠΎΠ΄Π½ΠΎ ΡΠΎΠΌΠ΅ ΠΏΠ΅ΡΡΠΎΡΠΌΠ°Π½ΡΠ΅
ΡΠΈΠ½Π°Π»Π½ΠΎΠ³ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π° Ρ Π²Π΅Π»ΠΈΠΊΠΎΡ ΠΌΠ΅ΡΠΈ ΡΡ ΡΡΠ»ΠΎΠ²ΡΠ΅Π½Π΅ ΠΊΠ²Π°Π»ΠΈΡΠ΅ΡΠΎΠΌ ΠΏΡΠΎΠΈΠ·Π²Π΅Π΄Π΅Π½ΠΎΠ³
ΠΎΡΠΏΡΠ΅ΡΠΊΠ°.
ΠΠ½Π°ΡΠ°ΡΠ°Π½ ΡΠ°ΠΊΡΠΎΡ Π·Π° ΡΡΠ°Π±ΠΈΠ»Π½Ρ ΠΈ Π΅ΡΠΈΠΊΠ°ΡΠ½Ρ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡ ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠΊΠΈΡ
ΠΎΡΠΏΡΠ΅ΡΠ°ΠΊΠ°
ΠΏΡΠ΅Π΄ΡΡΠ°Π²ΡΠ° ΠΌΠΎΠ³ΡΡΠ½ΠΎΡΡ ΠΈΠ·Π²ΠΎΡΠ΅ΡΠ° ΡΠ΅Π°Π»ΠΈΡΡΠΈΡΠ½ΠΈΡ
Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠΈΡ
ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ° ΡΠ°ΠΌΠΎΠ³
ΠΏΡΠΎΡΠ΅ΡΠ°. ΠΠΎΠ΄Π΅Π»ΠΈΡΠ°ΡΠ΅ ΠΎΠ²ΠΎΠ³ ΠΏΡΠΎΡΠ΅ΡΠ° Π½Π°ΡΡΠ΅ΡΡΠ΅ ΡΠΊΡΡΡΡΡΠ΅ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½Π΅ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½Π΅
ΠΌΠΎΠ΄Π΅Π»Π΅ ΡΠ° Π²Π΅Π»ΠΈΠΊΠΈΠΌ Π±ΡΠΎΡΠ΅ΠΌ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ°. ΠΡΠΎΡΠ΅Π΄ΡΡΠ΅ ΠΊΠ°Π»ΠΈΠ±ΡΠΈΡΠ°ΡΠ° ΠΎΠ²ΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ°,
ΠΊΠΎΡΠ΅ ΡΡ ΡΡΠ΅Π½ΡΡΠ½ΠΎ Ρ ΠΏΡΠΈΠΌΠ΅Π½ΠΈ,Π·Π°Ρ
ΡΠ΅Π²Π°ΡΡ ΠΈΠ·Π²ΠΎΡΠ΅ΡΠ΅ Π½ΠΈΠ·Π° Π΄Π΅ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΈΡ
ΡΠ΅ΡΡΠΎΠ²Π° Π½Π°
ΠΎΡΠΏΡΠ΅ΡΠΊΡ. ΠΠ²Π°ΠΊΠ°Π² ΠΏΡΠΈΡΡΡΠΏ ΡΠ΅ Π·Π°Ρ
ΡΠ΅Π²Π°Π½ ΠΈ Π½Π΅ΠΏΡΠΈΠ»Π°Π³ΠΎΡΠ΅Π½ Π·Π° ΡΡΡΠΈΠ½ΡΠΊΡ ΠΈΠ½Π΄ΡΡΡΡΠΈΡΡΠΊΡ
ΠΏΡΠΈΠΌΠ΅Π½Ρ.
Π£ ΠΎΠΊΠ²ΠΈΡΡ ΠΎΠ²Π΅ Π΄ΠΈΡΠ΅ΡΡΠ°ΡΠΈΡΠ΅ ΡΠ°Π·Π²ΠΈΡΠ΅Π½Π° ΡΠ΅ Π°Π»ΡΠ΅ΡΠ½Π°ΡΠΈΠ²Π½Π° ΠΌΠ΅ΡΠΎΠ΄Π°,ΡΠ° Π½ΠΈΠ·ΠΎΠΌ
ΠΏΡΠ΅Π΄Π½ΠΎΡΡΠΈ ΠΏΡΠΈ ΡΠ΅ΡΠ°Π²Π°ΡΡ ΠΎΠΏΠΈΡΠ°Π½ΠΎΠ³ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ° ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ°, Π·Π°ΡΠ½ΠΎΠ²Π°Π½Π°
Π½Π° ΠΏΡΠΈΠΌΠ΅Π½ΠΈ ΠΈΠ½Π²Π΅ΡΠ·Π½ΠΈΡ
Π°Π½Π°Π»ΠΈΠ·Π°.Π Π°Π·Π²ΠΈΡΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΠΊΠΎΡΠΈΡΡΠΈ ΠΊΠ°ΠΎ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½Π΅
ΠΏΠΎΠ΄Π°ΡΠΊΠ΅ ΠΈΡΠΊΡΡΡΠΈΠ²ΠΎ ΠΎΠ½Π΅ Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ ΠΊΠΎΡΠ΅ ΡΠ΅ ΠΌΠΎΠ³Ρ ΠΈΠ·ΠΌΠ΅ΡΠΈΡΠΈ Ρ ΡΠΎΠΊΡ ΠΏΡΠΎΡΠ΅ΡΠ° ΡΠ°Π±ΠΈΡΠ°ΡΠ°,
ΡΠΈΠΌΠ΅ ΡΠ΅ ΠΈΡΠΊΡΡΡΠ΅Π½Π° ΠΏΠΎΡΡΠ΅Π±Π° Π·Π° ΡΠΏΡΠΎΠ²ΠΎΡΠ΅ΡΠ΅ΠΌ Π΄Π΅ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΈΡ
ΠΈΡΠΏΠΈΡΠΈΠ²Π°ΡΠ°Π½Π°
ΠΎΡΠΏΡΠ΅ΡΠΊΡ.Π£ ΠΎΠΊΠ²ΠΈΡΡ ΡΠ°Π·Π²ΠΈΡΠ΅Π½Π΅ ΠΌΠ΅ΡΠΎΠ΄Π΅ ΡΠΎΡΠΌΠΈΡΠ°Π½Π° ΡΠ΅ ΡΠΈΡΠ½Π° ΡΡΠ½ΠΊΡΠΈΡΠ° ΠΊΠΎΡΠ°
ΠΊΠ²Π°Π½ΡΠΈΡΠΈΠΊΡΡΠ΅ Π΄ΠΈΡΠΊΡΠ΅ΠΏΠ°Π½ΡΡ ΠΈΠ·ΠΌΠ΅ΡΡ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½ΠΎ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ
,ΠΈ ΠΎΠ΄Π³ΠΎΠ²Π°ΡΡΡΡΠΈΡ
Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠΈ Π΄ΠΎΠ±ΠΈΡΠ΅Π½ΠΈΡ
Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ.Π’Π°ΠΊΠΎ ΡΠ΅ ΠΏΡΠΎΡΠ΅Ρ ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΠ΅ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ° ΡΠ²Π΅Π΄Π΅Π½ Π½Π° ΠΏΡΠΎΠ±Π»Π΅ΠΌ Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠ΅ ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°ΡΠΈΡΠ΅ ΡΠΎΡΠΌΠΈΡΠ°Π½Π΅ ΡΠΈΡΠ½Π΅
ΡΡΠ½ΠΊΡΠΈΡΠ΅.ΠΠ°ΠΊΠΎ Π±ΠΈ ΡΠ΅ ΠΎΠ±Π΅Π·Π±Π΅Π΄ΠΈΠ»Π° ΠΎΠ΄Π³ΠΎΠ²Π°ΡΠ°ΡΡΡΠ° ΠΎΡΠ΅ΡΡΠΈΠ²ΠΎΡΡ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½ΠΎ
ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ
Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ Π½Π° ΡΡΠ°ΠΆΠ΅Π½Π΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ΅ΡΠ΅,Π΄Π΅ΡΠΈΠ½ΠΈΡΠ°Π½Π΅ ΡΡ ΠΏΠΎΡΠ΅Π±Π½Π΅ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ΅
ΠΎΡΠΏΡΠ΅ΡΠ°ΠΊΠ° ΠΊΠ°ΠΎ ΡΠ΅Π·ΡΠ»ΡΠ°Ρ Π΄Π΅ΡΠ°ΡΠ½Π΅ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΡΠΊΠ΅ Π°Π½Π°Π»ΠΈΠ·Π΅.Π’ΠΈΠΌΠ΅ ΡΠ΅ ΡΠΎΡΠΌΠΈΡΠ°Π½
Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ»Π°Π½ΠΈ ΠΏΡΠΎΡΠΎΠΊΠΎΠ» ΠΊΠΎΡΠΈ ΡΠ°ΡΠ½ΠΎ Π΄Π΅ΡΠΈΠ½ΠΈΡΠ΅ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΡ ΠΎΡΠΏΡΠ΅ΡΠ°ΠΊΠ°,ΠΈΠ·Π±ΠΎΡ
Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½ΠΈΡ
Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ,ΠΈ ΠΏΡΠΈΠΌΠ΅Π½Ρ ΠΎΠ΄Π³ΠΎΠ²Π°ΡΠ°ΡΡΡΠΈΡ
Π°Π»Π³ΠΎΡΠΈΡΠ°ΠΌΠ° ΠΈ ΡΠΈΡΡ
Π°ΡΡΠΎΠΌΠ°ΡΡΠΊΠΎΠ³ Π΄ΠΎΠ±ΠΈΡΠ°ΡΠ° ΡΡΠ°ΠΆΠ΅Π½ΠΈΡ
ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ°.
Π Π°Π·Π²ΠΈΡΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠ΅ ΡΠ΅ΡΡΠΈΡΠ°Π½Π° Π½Π° ΡΠ΅ΡΠ°Π²Π°ΡΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ° ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΠ΅ βDrucker-PragerCapβ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΎΠ³ ΠΌΠΎΠ΄Π΅Π»Π°,ΠΊΠΎΡΠΈ ΡΠ΅ ΡΠ΅ΡΡΠΎ ΠΏΡΠΈΠΌΠ΅ΡΡΡΠ΅ Ρ ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ°ΠΌΠ° ΠΏΡΠΎΡΠ΅ΡΠ° ΡΠ°Π±ΠΈΡΠ°ΡΠ° ΠΏΡΠ°Ρ
Π°. Π’Π΅ΡΡΠΈΡΠ°ΡΠ΅ ΡΠ΅ ΡΠΊΡΡΡΠΈΠ»ΠΎ ΠΈ ΠΎΠ±ΠΈΠΌΠ½Ρ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»Π½Ρ ΠΊΠ°ΠΌΠΏΠ°ΡΡ ΠΊΠΎΡΠΈΡΡΠ΅ΡΠ΅ΠΌ Π΄Π΅ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΈΡ
ΡΠ΅ΡΡΠΎΠ²Π° Π½Π° ΠΎΡΠΏΡΠ΅ΡΡΠΈΠΌΠ°, ΡΠΈΠΌΠ΅ ΡΡ Π΄ΠΎΠ±ΠΈΡΠ΅Π½Π΅ ΡΠ΅ΡΠ΅ΡΠ΅Π½ΡΠ½Π΅ Π²ΡΠ΅Π΄Π½ΠΎΡΡΠΈ, ΡΠΏΠΎΡΡΠ΅Π±ΡΠ΅Π½Π΅ ΠΊΠ°ΠΎ Π±Π°Π·Π° Π·Π° ΠΏΠΎΡΠ΅ΡΠ΅ΡΠ΅. ΠΠΎΠΏΡΠ½ΡΠΊΠ° Π²Π΅ΡΠΈΡΠΈΠΊΠ°ΡΠΈΡΠ° ΡΠ°ΡΡΠΎΡΠ°Π»Π° ΡΠ΅ Ρ ΡΠΈΠΌΡΠ»ΠΈΡΠ°ΡΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΈΡ
Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ°, ΠΊΠΎΡΠΈΡΡΠ΅ΡΠ΅ΠΌ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΠ°ΡΠ° Π΄ΠΎΠ±ΠΈΡΠ΅Π½ΠΈΡ
ΠΏΡΠΈΠΌΠ΅Π½ΠΎΠΌ ΡΠ°Π·Π²ΠΈΡΠ΅Π½Π΅ ΠΌΠ΅ΡΠΎΠ΄Π΅. ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠ΅ ΠΏΡΠΈΠΌΠ΅ΡΠ΅Π½Π° ΠΈ Π½Π° ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΡ ΡΠ»ΠΎΠΆΠ΅Π½ΠΈΡΠ΅Π³ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΎΠ³ ΠΌΠΎΠ΄Π΅Π»Π° ΠΊΠΎΡΠΈ ΠΊΠΎΡΠΈΡΡΠΈ βBigoni-Piccolroazβ ΠΌΠΎΠ΄Π΅Π» ΠΏΠ»Π°ΡΡΠΈΡΠ½ΠΎΡΡΠΈ. ΠΠ²ΠΎ ΠΏΡΠ΅Π΄ΡΡΠ°Π²ΡΠ° Π½ΠΎΠ² ΠΈ ΠΈΠ·ΡΠ°Π·ΠΈΡΠΎ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ°Π½ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΈ ΠΌΠΎΠ΄Π΅Π», ΠΏΠ° ΡΠ΅ ΡΠ΅Π³ΠΎΠ²Π° Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠ° ΠΈΠΌΠΏΠ»Π΅ΠΌΠ΅Π½ΡΠ°ΡΠΈΡΠ° ΡΠ΅Π·ΡΠ»ΡΠΈΡΠ°Π»Π° Π½Π΅ΡΡΠ°Π±ΠΈΠ»Π½ΠΈΠΌ Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠΈΠΌ ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ°ΠΌΠ°, ΡΠΈΠ½Π΅ΡΠΈ ΡΠΈΡΠ½Ρ ΡΡΠ½ΠΊΡΠΈΡΡ Π΄ΠΈΡΠΊΠΎΠ½ΡΠΈΠ½ΡΠ°Π»Π½ΠΎΠΌ. ΠΡΠΈ ΡΠ΅ΡΠ°Π²Π°ΡΡ ΠΎΠ²ΠΎΠ³ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ° ΠΊΠ°Π»ΠΈΠ±ΡΠ°ΡΠΈΡΠ΅, ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°ΡΠΈΡΠ° ΡΠ΅ ΠΈΠ·Π²ΡΡΠ΅Π½Π° ΡΠΏΠΎΡΡΠ΅Π±ΠΎΠΌ βΠ³Π΅Π½Π΅ΡΠΈΡΠΊΠΈΡ
Π°Π»Π³ΠΎΡΠΈΡΠ°ΠΌΠ°β,ΡΠ· ΡΠ°Π·Π²ΠΈΡΠ΅Π½ΠΈ
ΡΠ΅Π΄ΡΠΊΠΎΠ²Π°Π½ΠΈ ΠΌΠΎΠ΄Π΅Π» Π·Π° Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠ΅ ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ΅ ΡΠ΅ΡΡΠ°, ΡΠΈΠΌΠ΅ ΡΠ΅ ΠΏΠΎΡΡΠΈΠ³Π½ΡΡΠΎ Π·Π½Π°ΡΠ°ΡΠ½ΠΎ ΡΠΌΠ°ΡΠ΅ΡΠ΅ ΠΊΠΎΠΌΠΏΡΡΡΠ΅ΡΡΠΊΠΎΠ³ Π²ΡΠ΅ΠΌΠ΅Π½Π° ΠΏΡΠΈΠΈΠ·Π²ΠΎΡΠ΅ΡΡ Π½Π΅Π»ΠΈΠ½Π΅Π°ΡΠ½ΠΈΡ
ΡΠΈΠΌΡΠ»Π°ΡΠΈΡΠ°. ΠΠ° ΡΠ°ΠΌΠΎΠΌ ΠΊΡΠ°ΡΡ, ΡΠΏΠΎΡΠ΅ΡΠ΅Π½ΠΈ ΡΡ ΡΠ΅Π·ΡΠ»ΡΠ°ΡΠΈ Π΄ΠΎΠ±ΠΈΡΠ΅Π½ΠΈ ΠΏΡΠΈΠΌΠ΅Π½ΠΎΠΌ ΡΠ΅Π΄Π½ΠΎΠ³ ΠΈ Π΄ΡΡΠ³ΠΎΠ³ ΠΊΠΎΠ½ΡΡΠΈΡΡΡΠΈΠ²Π½ΠΎΠ³ ΠΌΠΎΠ΄Π΅Π»Π° ΡΠ· Π½Π°Π·Π½Π°ΡΠ΅Π½Π΅ ΡΠΌΠ΅ΡΠ½ΠΈΡΠ΅ ΠΎ Π³ΡΡΠΏΠΈ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ° Π½Π° ΠΊΠΎΡΠΈΠΌΠ° ΠΈΡ
ΡΠ΅ ΠΌΠΎΠ³ΡΡΠ΅ ΠΏΡΠΈΠΌΠ΅Π½ΠΈΡΠΈ ΡΠ° Π·Π°Π΄ΠΎΠ²ΠΎΡΠ°Π²Π°ΡΡΡΠΎΠΌ ΡΠ°ΡΠ½ΠΎΡΡΡ
Reduced order numerical modeling for calibration of complex constitutive models in powder pressing simulations
Numerical simulations of different ceramic production phases often involve
complex constitutive models, with difficult calibration process, relying on a
large number of experiments. Methodological developments, proposed in present
paper regarding this calibration problem can be outlined as follows:
assessment of constitutive parameters is performed through inverse analysis
procedure, centered on minimization of discrepancy function which quantifies
the difference between measurable quantities and their computed counterpart.
Resulting minimization problem is solved through genetic algorithms, while
the computational burden is made consistent with constraints of routine
industrial applications by exploiting Reduced Order Model (ROM) based on
proper orthogonal decomposition. Throughout minimization, a gradual
enrichment of designed ROM is used, by including additional simulations. Such
strategy turned out to be beneficial when applied to models with a large
number of parameters. Developed procedure seems to be effective when dealing
with complex constitutive models, that can give rise to non-continuous
discrepancy function due to the numerical instabilities. Proposed approach is
tested and experimentally validated on the calibration of modified
Drucker-Prager CAP model, frequently adopted for ceramic powder pressing
simulations. Assessed values are compared with those obtained by traditional,
time-consuming tests, performed on pressed green bodies
Reduced order numerical modeling for calibration of complex constitutive models in powder pressing simulations
A Comprehensive Review on Cucurbits Yellow Stunting Disorder Virus (CYSDV) and their Management
Cucurbit Yellow Stunting Disorder Virus (CYSDV) represents a significant threat to global agriculture, particularly impacting the cultivation of cucurbit crops such as melons, squashes, and cucumbers. This comprehensive review explores the various dimensions of CYSDV, including its taxonomy, epidemiology, pathogenesis, diagnostic methods, management, ongoing research, and the broader social and economic implications. Beginning with an examination of CYSDV's classification and morphology, the review delineates the geographical distribution of the virus, its host range, transmission vectors, and environmental factors influencing its spread. It also outlines the mechanisms of infection, stages of disease development, symptoms in various cucurbit species, and the economic impact of the disease. The discussion extends to both traditional and molecular diagnostic techniques and the associated challenges. Different strategies for managing and controlling CYSDV are highlighted, including cultural practices, chemical methods, biological control, and integrated pest management approaches. The review emphasizes ongoing research initiatives and future perspectives in CYSDV research, considering technological innovations and potential limitations. The final sections focus on the broader social and economic context, exploring the impact of CYSDV on small and large-scale farming, international trade considerations, community engagement, and government initiatives. Through an integrated analysis, this review provides valuable insights into the multifaceted nature of CYSDV, its influence on agriculture, and the wider societal dynamics. The conclusion underscores the necessity of a coordinated, comprehensive approach that leverages scientific research, international collaboration, community involvement, and governmental support to address the challenges posed by CYSDV. Understanding the complexities of this virus is essential for developing effective strategies to ensure food security and economic stability in regions affected by this detrimental plant disease