热塑性尼龙纤维烧结过程的建模及实验验证

Coalescence Modeling and Experimental Validation of Sintering of Thermoplastic Polyamide Fibers

为了研究热塑性聚合物粉末的烧结合并过程,在Frenkel、Eshelby和Pokluda等人模型的基础上建立2D数学模型,同时用尼龙纤维(长度远大于直径,可视为无限长)进行烧结实验,观察其横截面的合并过程。将数学模型预测结果与实验结果以及Constrained Natural Element Method(C-NEM)数值模拟结果进行对比,其结果基本一致,所获得的数学模型和实验结果可为烧结合并过程的数值模拟和理论研究提供依据。

In order to study the coalescence mechanisms of thermoplastic polymer powders, a 2D mathematical model was established based on Frenkel, Eshelby and Pokluda＇s model. Sintering experiments were, carried out using two polyamide fibers that can be considered as infinite cylinders as the length much larger than the diameter. 2D mathematical model was validated through comparison with results of sintering experiments as well as Constrained Natural Element Method （C-NEM） coalescence simulation. This consistence shows that the proposed coalescence model and experimental results can provide a reference for the numerical simulation of sintering process.