Thin composite shell structures manufactured from stitched unidirectional non-crimp fabrics (UD-NCF) in a liquid composite moulding process provide high lightweight design capabilities. For complex geometries, the forming process of the textile pre-products is challenging and requires intensive investigations to avoid defects like macroscopic wrinkling or fibre gapping. In contrast to biaxial engineering fabrics, UD-NCF has been investigated only sparsely in terms of its forming behaviour, both experimentally and numerically. To close this gap, a macroscopic forming simulation model for UD-NCF is proposed in this work, including a new non-orthogonal and linear strain measure for large strains and the corresponding nominal stress measure. To parameterize the constitutive laws and to investigate the multiaxial deformation behaviour of UD-NCF, supplementary off-axis-tension tests with optical strain measurement are performed in this work. The new forming simulation model is validated via forming simulation of a hemisphere test and of a preforming process of an automotive component.

由缝制的单向非卷曲织物（UD-NCF）制成的薄型复合材料外壳结构在液体复合材料成型工艺中具有很高的轻量化设计能力。对于复杂的几何形状，纺织品预产品的成型过程具有挑战性，需要进行深入的研究，以避免宏观起皱或纤维裂口等缺陷。与双轴工程织物相反，UD-NCF仅在稀疏性方面进行了研究，无论是在实验上还是在数值上。为了缩小这一差距，在这项工作中提出了用于UD-NCF的宏观成形仿真模型，其中包括针对大应​​变的新的非正交和线性应变测量以及相应的名义应力测量。为了参数化本构定律并研究UD-NCF的多轴变形行为，在这项工作中，进行了带有光学应变测量的辅助离轴张力测试。通过半球测试和汽车零部件预成型过程的成型仿真来验证新的成型仿真模型。