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Binghamova plastika

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Binghamova plastika je viskoplastični materijal koji se ponaša kao kruto tijelo pri niskim naprezanjima, ali struji viskozan fluid pri većim naprezanjima. Naziv je dobio po Eugeneu C. Binghamu, koji je predložio njegov matematički oblik.[1].

Koristi se kao prosti matematički model strujanja mulja u pomorskom inženejrstvu, te u proračunima emulzija za bušenje. Čest primjer je zubna pasta[2], koja neće biti istisnuta sve dok se određeni hidrostatički pritisak ne primijeni na tubu.

Definicija

[uredi | uredi izvor]

Materijal je krut za tangencijalni napon τ, koji je manji od kritične vrijednosti . Kada se pređe kritični tangencijalni napon, materijal struji kao newtonov fluid sa prisratom tangencijalnog napona i promjenom smicajnog napona, ∂u/∂y:

Također pogledajte

[uredi | uredi izvor]

Reference

[uredi | uredi izvor]
  1. ^ E.C. Bingham,(1916) U.S. Bureau of Standards Bulletin, 13, 309-353 "An Investigation of the Laws of Plastic Flow"
  2. ^ J. F. Steffe (1996) Rheological Methods in Food Process Engineering 2nd ed ISBN 0-9632036-1-4
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Binghamova plastika
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