Jamora Von Clyde, Rauch Virginia, Kravchenko Sergii G, Kravchenko Oleksandr G
Department of Aerospace and Mechanical Engineering, Old Dominion University, Norfolk, VA 23529, USA.
Department of Materials Engineering, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
Polymers (Basel). 2023 Dec 21;16(1):31. doi: 10.3390/polym16010031.
Automated fiber placement is a state-of-the-art manufacturing method which allows for precise control over layup design. However, AFP results in irregular morphology due to fiber tow deposition induced features such as tow gaps and overlaps. Factors such as the squeeze flow and resin bleed out, combined with large non-linear deformation, lead to morphological variability. To understand these complex interacting phenomena, a coupled multiphysics finite element framework was developed to simulate the compaction behavior around fiber tow gap regions, which consists of coupled chemo-rheological and flow-compaction analysis. The compaction analysis incorporated a visco-hyperelastic constitutive model with anisotropic tensorial prepreg viscosity, which depends on the resin degree of cure and local fiber orientation and volume fraction. The proposed methodology was validated using the compaction of unidirectional tows and layup with a fiber tow gap. The proposed approach considered the effect of resin bleed out into the gap region, leading to the formation of a resin-rich pocket with a complex non-uniform morphology.
自动铺丝是一种先进的制造方法，它能够对铺层设计进行精确控制。然而，由于纤维束沉积引起的特征，如束间间隙和重叠，自动铺丝会导致不规则的形态。挤压流动和树脂渗出等因素，再加上大的非线性变形，会导致形态变化。为了理解这些复杂的相互作用现象，开发了一个耦合多物理场有限元框架来模拟纤维束间隙区域周围的压实行为，该框架由化学流变学和流动压实分析耦合而成。压实分析采用了一个粘弹性超弹性本构模型，该模型具有各向异性张量预浸料粘度，它取决于树脂的固化程度以及局部纤维取向和体积分数。使用单向纤维束的压实和带有纤维束间隙的铺层对所提出的方法进行了验证。所提出的方法考虑了树脂渗入间隙区域的影响，导致形成一个具有复杂非均匀形态的富树脂区域。
