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材料工程  2013 

聚碳酸酯熔体挤压流变研究

DOI: 10.3969/j.issn.1001-4381.2013.05.015, PP. 73-77

Keywords: 挤压流动,流变,本构模型,应力

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Abstract:

鉴于现有流变仪不能直接表征挤压过程的应力-应变关系,本工作设计了恒定接触面积模式平板挤压流动装置,通过测量上平板压力及移动位移来表征熔体的流变特征,再通过理论建模和数值计算分别研究了幂律模型、PTT模型和XPP模型表征挤压过程的准确性。结果表明聚碳酸酯熔体挤压应力随应变的增加而增大,当熔体温度降低、挤压速率升高时,挤压应力随应变表现出三段分布,而初始挤压间距不影响应力应变分布模式,仅仅影响挤压应力的大小;黏弹本构模型可以预测出挤压应力的变化趋势,其中XPP模型的预测值更接近实验结果。

References

[1]  WU C H, CHEN W S.Injection molding and injection compression molding of three-beam grating of DVD pickup lens[J]. Sen- sors and Actuators A, 2006, 125(2): 367-375.
[2]  LEE S H, KIM S Y, YOUN J R, et al. Warpage of a large-sized orthogonal stiffened plate produced by injection molding and injection compression molding[J]. Journal of Applied Polymer Science, 2010, 116(6): 3460-3467.
[3]  GUAN W S, HUANG H X, WANG B. Poiseuille/squeeze flow-induced crystallization in microinjection-compression molded isotactic polypropylene[J]. Journal of Polymer Science: Part B: Polymer Physics, 2013, 51(5):358-367.
[4]  PATHAM B, FOSS P H. Thermoplastic vibration welding: review of process phenomenology and processing-structure-property interrelationships[J]. Polymer Engineering & Science, 2011, 51(1): 1-22.
[5]  LAUN H M, RADY M, HASSAGER O. Analytical solutions for squeeze flow with partial wall slip[J]. Journal of Non-Newtonian Fluid Mechanics, 1999, 81(1-2): 1-15.
[6]  RAN X J, ZHU Q Y, LI Y. An explicit series solution of the squeezing flow between two infinite plates by means of the homotopy analysis method[J]. Communications in Nonlinear Science and Numerical Simulations, 2009, 14(1): 119-132.
[7]  MEETEN G H. Yield stress of structured fluids measured by squeeze flow[J]. Rheologica Acta, 2000, 39(4): 399-408.
[8]  CHAN T W, BAIRD D G. An evaluation of a squeeze flow rheometer for the rheological characterization of a filled polymer with a yield stress[J]. Rheologica Acta, 2002, 41(3): 245-256.
[9]  DEBBAUT B. Non-isothermal and viscoelastic effects in the squeeze flow between infinite plates[J]. Journal of Non-Newtonian Fluid Mechanics, 2001, 98(1): 15-31.
[10]  KARAPETSAS G, TSAMOPOULOS J. Transient squeeze flow of viscoplastic materials[J]. Journal of Non-Newtonian Fluid Mechanics, 2006, 133(1): 35-56.
[11]  黄树新,江体乾. 黏弹流体流动的数值模拟研究进展[J]. 力学进展,2001,31(2):276-288. HUANG S X, JIANG T Q. Development of numerical simulation for viscoelastic fluid flow[J]. Advances in Mechanics, 2001, 31(2): 276-288.
[12]  ENGMANN J, SERVAIS C, BURBIDGE A S. Squeeze flow theory and applications to rheometry: a review[J]. Journal of Non-Newtonian Fluid Mechanics, 2005, 132(1-3): 1-27.
[13]  VERBEETEN W M H, PETERS G W M, BAAIJENS F P T. Differential constitutive equations for polymer melts: the eXtended Pom-Pom model[J]. Journal of Rheology, 2001, 45(4): 823-844.

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