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A MODIFICATION OF THE WARD EQUATION FOR COMPUTING THE PRESSURE EXTRUSION FOR SOLID PHASE POLYMERS BY USING LOWER BOUND THEORY | ||
| AL-TAQANI | ||
| Article 1, Volume 24, Issue 3, 2011, Pages 0-0 | ||
| Abstract | ||
| In this research a formula for computing the theoretical extrusion for solid phase of polymers has been concluded. The Formula was adapted from the Ward equation ( by the use of lower bound theory ) by adding the redundant Work effects ( WR ) and strain rate in the flow stress effects (σf) to the formula . The theoretical results of the pressure (p) for the new formula was testing and compared with the theoretical results of the Ward equation and with the practical experimental results . The comparison parameters were the effect of reduction ratios ( R%) ( 7.01 , 21.55 , 43.7 , 58.7 , 71. 3 ) % and semi – die angle ( α°) ( 7.5° , 15° , 20° , 25° , 30°) on the extrusion pressure at the strain rate equal to ( 33x10-4/sec ). Practical Experiments have been done in two kinds the high density polyetheiline and low density polyetheline through nine cone dies on pressure instrument by use Grease oil The results of the modified formula showed that the results in the reduction ratios and the semi – die angle gave an approaching (96, 92.9) % compared with the practical experimental results respectively. The new formula gave a better agreement Compared Ward equation which gave approaching ( 92 , 84.4 ) % respectively from practical experimental Results . | ||
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