ABSTRACT

Contact resistances play a major role in Joule heating systems. Identifying contact resistances provides a better understanding of the heating process and increases the accuracy of the process models. In this study, contact resistances of the Joule heating section in a powder-epoxy-based towpregging line were explored. For different process parameters, such as production speed, tension, and temperature, contact resistances occurring between metal roller electrodes and dry carbon fibre tows (i.e. without powder-epoxy) were measured to gain an insight into the heating process. Moreover, the effect of contact resistance heating on the temperature profile of the carbon fibre tows was determined with an infrared thermal camera. A simplified finite element model was developed to calculate the temperature distribution onthe carbon fibre tow, which showed a good agreement with the experimental data. Results suggest that contact resistances in the towpregging line were significant and contact resistance heating changed the heating profile.

摘要

接触电阻在焦耳加热系统中起着重要作用。识别接触电阻可以更好地理解加热过程并提高过程模型的准确性。在这项研究中，研究了基于粉末环氧树脂的牵引线中焦耳加热部分的接触电阻。对于不同的工艺参数，如生产速度、张力和温度，测量金属辊电极和干碳纤维丝束（即没有粉末环氧树脂）之间发生的接触电阻，以深入了解加热过程。此外，使用红外热像仪确定了接触电阻加热对碳纤维丝束温度分布的影响。建立了一个简化的有限元模型来计算碳纤维丝束的温度分布，与实验数据吻合良好。结果表明，预浸线中的接触电阻很大，接触电阻加热改变了加热曲线。