On the predictive/fitting capabilities of the advanced differential constitutive equations for linear polyethylene melts
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- 作者：Radek Pivokonsky ; Martin Zatloukal ; Petr Filip
- 关键词：Constitutive equations ; Polymer melts ; Shear flow ; Elongational flow
- 刊名：Journal of Non-Newtonian Fluid Mechanics
- 出版年：2008
- 出版时间：14 March 2008
- 年：2008
- 卷：150
- 期：1
- 页码：56-64
- 全文大小：2031 K
文摘
This contribution examines the capabilities of three differential constitutive models (XPP, PTT-XPP, and modified Leonov) in predicting rheological properties of two virtually linear polyethylene materials (HDPE Tipelin FS 450-26, mLLDPE Exact 0201) with specific attention to both steady as well as transient shear and uniaxial elongational flow situations. For each situation the (dis)advantages of the individual models are discussed and both, qualitative and quantitative model efficiency evaluation has been carried out.