Abstract

The technology for producing products from composite materials with a thermoplastic binder differs from the traditional method, which uses thermosetting resins as a binder, and requires new design and technological solutions. This article proposes a two-stage method for manufacturing a long-length carbon strand of high-voltage cables: in the first stage, a thermoplastic layer of the polyetheretherketone (PEEK) melt is applied to the carbon filament; in the second stage, a strand is formed from the filaments and crimped by hydrodynamic drawing. Using the finite-element method, a numerical model of the process of applying a thermoplastic layer to a carbon filament in an axisymmetric die is constructed. To describe the rheological properties of the PEEK melt, a generalized Carreau model was selected and the material constants included in it are determined. The velocity, pressure, and temperature fields are calculated, and the effects of the applied pressure and strand drawing speed on the thickness of the applied layer are estimated. For the stage of formation and impregnation of the strand composed of carbon filaments covered with a thermoplastic layer, a dimensionless equation for the position of the impregnation front of the porous carbon filament influenced by an external pressure that is linearly distributed along the channel is obtained on the basis of the analytical solution of the flat-radial filtration problem under the assumption that each filament in the strand is under the same conditions in the process of crimping. The developed mathematical model allows one to calculate the pressure and temperature fields and flow kinematics, to evaluate the influence of technological parameters on the thickness of the thermoplastic layer applied to the filament, and to predict the degree of uniformity of the finished product.

中文翻译：

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使用热塑性粘合剂由复合材料制造长条产品的预浸料的某些方面

摘要

由具有热塑性粘合剂的复合材料生产产品的技术与传统方法不同，传统方法使用热固性树脂作为粘合剂，并且需要新的设计和技术解决方案。本文提出了一种分两步的方法来制造高压电缆的长碳绞线：在第一步中，将聚醚醚酮（PEEK）熔体的热塑性塑料层施加到碳丝上；在第二阶段中，由细丝形成股线并通过流体动力拉伸将其卷曲。使用有限元方法，构建了在轴对称模具中将热塑性层施加到碳丝上的过程的数值模型。为了描述PEEK熔体的流变特性，选择一个广义的Carreau模型，并确定其中包含的材料常数。计算速度，压力和温度场，并估计所施加的压力和拉丝速度对所施加的层厚度的影响。对于由覆盖有热塑性层的碳丝构成的股线的形成和浸渍阶段，可得到在沿通道线性分布的外部压力影响下多孔碳丝的浸渍前沿位置的无量纲方程。假设在卷曲过程中，股线中的每个细丝处于相同条件下，则可以得出平径向过滤问题的解析解的基础。