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首页> 外文期刊>Journal of Applied Polymer Science >High-Temperature Large Strain Viscoelastic Behavior of Polypropylene Modeled Using an Inhomogeneously Strained Network
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High-Temperature Large Strain Viscoelastic Behavior of Polypropylene Modeled Using an Inhomogeneously Strained Network

机译：使用非均匀应变网络建模的聚丙烯高温大应变粘弹性行为

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摘要

The effects of microstructural rearrangements during the stretching of semicrystalline polymers and the resultant inhomogeneous strains are modeled by rigid spheres embedded in a polymer network. This results in strain concentraions in the network, which is then caused to yield at realistic overall straisn. To simulate the collapse of the original spherulitic morphology, the radii of the spheres decrease at a rate dependent on the shear stress imposed on them by the surrounding network. This results in time-dependent behavior. The resultant large strain viscoelastic model is implemented in a commercial finite element code and used to predict shapes of necking polypropylene sheet specimens at 150 deg C. Rate dependence of stress and stress relaxation are also predicted, and the model is shown to be genrally effective in its predictions of schapes and forces up to large deformations.
机译：通过嵌入聚合物网络中的刚性球体，模拟了半结晶聚合物拉伸过程中微观结构重排的影响以及由此产生的不均匀应变。这导致网络中的应变集中，然后导致在实际的整体应变下屈服。为了模拟原始球晶形态的崩溃，球体的半径以一定速率降低，该速率取决于周围网络对它们施加的切应力。这导致时间相关的行为。所得的大应变粘弹性模型在商业有限元代码中实现，并用于预测150℃下颈缩聚丙烯片材样品的形状。应力和应力松弛率的速率相关性也得到了预测，并且该模型被证明在一般情况下是有效的。其对竖筋和力的预测直至大变形。

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