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首页> 外文期刊>Journal of Applied Polymer Science >Necking behavior in high-speed melt spinning of poly(ethylene terephthalate)
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Necking behavior in high-speed melt spinning of poly(ethylene terephthalate)

机译：聚对苯二甲酸乙二醇酯的高速熔体纺丝缩颈行为

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The necking behavior in the high-speed melt-spinning process of poly(ethylene terephthalate) (PET) was analyzed using a mathematical simulation under a nonisothermal condition. A constitutive model into which the strain-rate dependence of viscosity and the strain-hardening effect are incorporated was used. Based on the simulated results, the cause of a local reduction of apparent viscosity was found to be due mainly to high strain rate. Also the onset of crystallization, if it occurred, was found to happen near the end of the neck. In addition, with no crystallization involved, the necking can still occur. The deformation process in high-speed spinning of PET was found to consist of two regions along the spin line: a Newtonian flow region and a rubberlike deformation region. The necking behavior is discussed here in terms of strain-rate sensitivity and strain-hardening parameter. As a result, a criterion for the onset of stable necking has been obtained. The necking behavior does not seem to be essentially different from that in cold drawing. (C) 2000 John Wiley & Sons, Inc. [References: 22]
机译：在非等温条件下，使用数学模拟分析了聚对苯二甲酸乙二醇酯（PET）在高速熔纺过程中的颈缩行为。使用了本构模型，其中包含了粘度的应变率依赖性和应变硬化效果。根据模拟结果，发现表观粘度局部降低的原因主要是由于高应变速率。如果发现结晶的话，也会在脖子末端附近发生。此外，在不涉及结晶的情况下，仍会发生颈缩。发现PET高速纺丝中的变形过程包括沿着旋转线的两个区域：牛顿流动区域和橡胶状变形区域。此处，根据应变率敏感性和应变硬化参数讨论了缩颈行为。结果，已经获得了开始稳定颈缩的标准。颈缩行为似乎与冷拔中的行为没有本质区别。 （C）2000 John Wiley＆Sons，Inc. [参考：22]

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