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Virtual manufacturing of composite aerostructures

机译：虚拟制造复合材料航空结构

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The past century has witnessed the rise and maturity of the flying machine, starting with the Wright brothers flyer to today's modern passenger aircrafts and warfighters. At the start of this century, yet another achievement in flying vehicle technology was seen with the launch of the Boeing 787 aircraft, which has a significant portion by weight of polymer matrix fibre composites. This paper, therefore, addresses the effects of the manufacturing process of fibre reinforced polymer matrix composites on mechanical performance. Computations are carried out using the Finite Element (FE) method at the microscale where Representative Volume Elements (RVEs) are analysed with Periodic Boundary Conditions (PBCs). Straight fibre prepreg-based composites and textile composites are considered. The commercial code ABAQUS is used as the solver for the FE equations, supplemented by user-written subroutines. The transition from a continuum to damage/failure is effected by using the Bazant-Oh crack band model, which preserves mesh objectivity. Results are presented for RVEs that are first subjected to curing and subsequently to mechanical loading. The effect of the fibre packing randomness on the microstructure is examined by considering multifibre RVEs where fibre volume fraction is held constant but with random packing of fibres. Plain weave textile composites are also cured first and then subjected to mechanical loads. The possibility of failure is accommodated throughout the analysis failure can take place during the curing process even prior to the application of in-service mechanical loads. The analysis shows the differences in both the cured RVE strength and stiffness, when cure-induced damage has and has not been taken into account.
机译：上个世纪见证了飞行器的兴起和成熟，从莱特兄弟的传单到当今的现代客机和战斗机开始。在本世纪初，随着波音787飞机的问世，飞行器技术取得了另一项成就，该飞机的重量占聚合物基纤维复合材料的比重很大。因此，本文探讨了纤维增强聚合物基复合材料制造工艺对机械性能的影响。使用有限元（FE）方法在微观尺度上进行计算，然后使用周期边界条件（PBC）分析代表体积要素（RVE）。考虑了基于直纤维预浸料的复合材料和纺织品复合材料。商业代码ABAQUS用作FE方程的求解器，并由用户编写的子例程进行补充。使用Bazant-Oh裂纹带模型可以实现从连续体到损坏/破坏的过渡，该模型可以保持网格的客观性。列出了首先进行固化然后进行机械加载的RVE的结果。通过考虑多纤维RVE（其中纤维体积分数保持恒定，但纤维无规堆积）来检查纤维堆积无规性对微观结构的影响。平纹织物复合材料也要先固化，然后再承受机械载荷。即使在施加使用中的机械载荷之前，也可以在固化过程中发生整个分析失败的可能性。分析表明，已考虑和未考虑到硫化引起的损伤时，硫化RVE强度和刚度的差异。

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