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APPLICATION OF LOWER BOUND THEORY TO SOLID STATE EXTRUSION OF POLYMERS | ||
| AL-TAQANI | ||
| Article 1, Volume 19, Issue 2, 2006, Pages 0-0 | ||
| Abstract | ||
| In this research , a theoretical modified equation which calculates the required pressure in extrusion process of polymer (p) , has been formulated with use of the lower bound theory. A comparison the results from modified equation and the experimental results and Imada results was made to study the effects of reduction ratios and semi-die angle on the extrusion pressure at the strain rate equal to ( 66 x 10 -4 sec -1 ) by The lower bound theory which assumes equilibrium of forces was used by (Hoffman and Sach) and it is developed by Imada in order to take the effect of redundant work and strain rate in to consideration. The modified equation gives a better agreement with the experimental results than Imada equation with increase in reduction ratios and semi-die angle. | ||
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