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Titolo:
Modeling of the non-linear rheological behavior of a lubricating grease atlow-shear rates
Autore:
Madiedo, JM; Franco, JM; Valencia, C; Gallegos, C;
Indirizzi:
Univ Huelva, Escuela Politecn Super, Dept Ingn Quim, Palos De La Frontera 21819, Huelva, Spain Univ Huelva Palos De La Frontera Huelva Spain 21819 21819, Huelva, Spain
Titolo Testata:
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
fascicolo: 3, volume: 122, anno: 2000,
pagine: 590 - 596
SICI:
0742-4787(200007)122:3<590:MOTNRB>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
YIELD STRESS; TRANSIENT FLOW; MAYONNAISE; SLIP;
Keywords:
constitutive equation; lubricating grease; normal stresses; transient flow; viscoelasticity; viscosity; very low shear rate motion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Madiedo, JM Univ Huelva, Escuela Politecn Super, Dept Ingn Quim, Palos De La Frontera 21819, Huelva, Spain Univ Huelva Palos De La Frontera Huelva Spain 21819 va, Spain
Citazione:
J.M. Madiedo et al., "Modeling of the non-linear rheological behavior of a lubricating grease atlow-shear rates", J TRIBOL, 122(3), 2000, pp. 590-596

Abstract

This paper deals with modeling the non-linear rheological behavior of lubricating greases at very low shear rates. With this aim, dynamic linear viscoelastic, non-linear stress relaxation, transient and steady-state shear flow, and transient first normal stress difference measurements have been carried out on a diurea-derivative lubricating grease. A factorable non-linearviscoelasticity model, the Wagner integral model, derived from the K-BKZ constitutive equation, was used in order to predict the non-linear rheological response of the above-mentioned lubricating grease under shear. The time-dependent part of the model was described by its linear relaxation spectrum, whilst two different damping functions (Wagner and Soskey-Winter's damping functions) were analysed as the strain-dependent factor. The continuous linear relaxation spectrum was estimated, using regularization techniques, from the dynamic linens viscoelasticity, functions. The damping function was calculated from non-linear stress relaxation tests. The constitutive model, with Soskey-Winter's damping function, predicted the steady-state flow curve, the transient shear stress and the transient first normal stress differences of the lubricating grease studied fairly well. [S0742-4787(00)01603-9].

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 22:22:24