A macroscopic approach to simulate the forming behaviour of stitched unidirectional non-crimp fabrics (UD-NCF)
A macroscopic approach to simulate the forming behaviour of stitched unidirectional non-crimp fabrics (UD-NCF)
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DOI：
10.1016/j.compositesa.2017.08.009
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发表时间：
2017-11
影响因子：
8.7
通讯作者：
F. Schirmaier;D. Dörr;F. Henning;F. Henning;L. Kärger
中科院分区：
文献类型：
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作者：
F. Schirmaier;D. Dörr;F. Henning;F. Henning;L. Kärger
在液体复合材料成型工艺中由缝合单向无卷曲织物（UD-NCF）制造的薄复合材料壳体结构提供了高轻量化设计能力。对于复杂的几何形状，纺织品预制品的成型工艺具有挑战性，需要进行深入研究，以避免宏观起皱或纤维间隙等缺陷。与双轴向工程织物相比，UD-NCF的成形性能，无论是实验还是数值模拟，都很少被研究。为了缩小这一差距，在这项工作中，UD-NCF的宏观成形模拟模型，包括一个新的非正交和线性应变测量大应变和相应的名义应力措施。参数化的本构关系，并调查UD-NCF的多轴变形行为，补充离轴拉伸试验与光学应变测量在这项工作中进行。通过半球试验和汽车零件预成形过程的成形模拟，验证了新的成形模拟模型。
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.