Lionetto Francesca, Moscatello Anna, Totaro Giuseppe, Raffone Marco, Maffezzoli Alfonso
Department of Engineering for Innovation, University of Salento, Via Arnesano, 73100 Lecce, Italy.
Leonardo S.p.A., Divisione Velivoli, Viale dell'Aeronautica snc, 80038 Napoli, Italy.
Materials (Basel). 2020 Oct 28;13(21):4800. doi: 10.3390/ma13214800.
Liquid resin infusion processes are becoming attractive for aeronautic applications as an alternative to conventional autoclave-based processes. They still present several challenges, which can be faced only with an accurate simulation able to optimize the process parameters and to replace traditional time-consuming trial-and-error procedures. This paper presents an experimentally validated model to simulate the resin infusion process of an aeronautical component by accounting for the anisotropic permeability of the reinforcement and the chemophysical and rheological changes in the crosslinking resin. The input parameters of the model have been experimentally determined. The experimental work has been devoted to the study of the curing kinetics and chemorheological behavior of the thermosetting epoxy matrix and to the determination of both the in-plane and out-of-plane permeability of two carbon fiber preforms using an ultrasonic-based method, recently developed by the authors. The numerical simulation of the resin infusion process involved the modeling of the resin flow through the reinforcement, the heat exchange in the part and within the mold, and the crosslinking reaction of the resin. The time necessary to fill the component has been measured by an optical fiber-based equipment and compared with the simulation results.
作为传统热压罐工艺的替代方法，液体树脂灌注工艺在航空应用中越来越具有吸引力。该工艺仍然存在一些挑战，只有通过精确模拟来优化工艺参数并取代传统的耗时试错程序才能应对这些挑战。本文提出了一个经过实验验证的模型，通过考虑增强材料的各向异性渗透率以及交联树脂中的化学物理和流变变化，来模拟航空部件的树脂灌注过程。该模型的输入参数已通过实验确定。实验工作致力于研究热固性环氧基体的固化动力学和化学流变行为，并使用作者最近开发的基于超声波的方法测定两种碳纤维预成型件的面内和面外渗透率。树脂灌注过程的数值模拟涉及树脂在增强材料中的流动建模、部件内部和模具内的热交换以及树脂的交联反应。通过基于光纤的设备测量填充部件所需的时间，并与模拟结果进行比较。
