Composite forming simulation for non-crimp fabrics based on generalized continuum approaches

基于广义连续体方法的无屈曲织物复合成型模拟

• 批准号: 431354059
• 负责人: Professorin Dr.-Ing. Luise Kärger
• 金额: --
• 依托单位: Institutsteil Leichtbautechnologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/431354059?language=en
• 关键词: Composite; forming; simulation; non; crimp

Continuous fiber reinforced composites (CFRP) are used to provide light weight and high performance. Among the possible reinforcements, NCF (Non Crimp Fabric) provides an interesting solution and are increasingly used for highly loaded structures. The fibres are straight and bonded together by stitches that can be adapted. Nevertheless, the forming of these NCFs is delicate. The deformation mechanisms involved are specific and there are few reliable approaches to simulating the forming process. The classical Cauchy mechanical models used for forming simulation are not able to simultaneously express the almost inextensibility of the fibres, the slippage between the fibres and the stitches and the bending stiffness of the fibres. The objective of this project is to develop simulation approaches that takes these different points into account using generalized continuous media models. To model the cases where gapping between the yarns will be possible, mesoscopic models will be constructed. Mechanical tests, at the yarn and reinforcement level, will be carried out to identify the models implemented in the simulations and in particular the generalized continuous environment models. Experimental forming tests on preforms of complex shapes will validate the draping simulations.

连续纤维增强复合材料（CFRP）用于提供轻质和高性能。在可能的加固中，NCF（非卷曲织物）提供了一个有趣的解决方案，并越来越多地用于高载荷结构。纤维是直的，并通过可以调整的缝线粘合在一起。然而，这些NCF的形成是微妙的。所涉及的变形机制是特定的，并且很少有可靠的方法来模拟成形过程。用于成形模拟的经典柯西力学模型不能同时表达纤维的几乎不可延伸性、纤维与缝线之间的滑移以及纤维的弯曲刚度。这个项目的目标是开发模拟方法，考虑到这些不同的点，使用广义连续介质模型。为了模拟纱线之间可能存在间隙的情况，将构建介观模型。将在纱线和增强层进行机械测试，以确定模拟中实施的模型，特别是广义连续环境模型。复杂形状的预成型件的实验成形测试将验证悬垂模拟。