Meso-modelling of Non-Crimp Fabric composites for coupled drape and failure analysis
Meso-modelling of Non-Crimp Fabric composites for coupled drape and failure analysis
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DOI：
10.1007/s10853-006-0213-6
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发表时间：
2006-10-01
影响因子：
4.5
通讯作者：
Pickett, A. K.
中科院分区：
文献类型：
--
作者：
Creech, G.;Pickett, A. K.
迄今为止，宏观分析方法一直被用于分析纺织复合材料结构的成形和力学性能。诸如纺织织物悬垂的几何“映射”技术和经典的层压分析结合简化的失效标准来确定机械性能，已经形成了大多数这些方法的基础。所应用的物理定律的有限精度适用于将纤维基复合材料视为均匀介质的宏观分析方法。然而，今天，现代高性能计算机为复合材料分析开辟了新的可能性，在这种分析中，可以获得复合成分材料的更多细节。本文介绍了用于纺织复合材料悬垂模拟的有限元技术，特别是双轴无卷曲织物，其中干束和缝合的复杂变形机制可以在单个束和缝合的中观水平上适当地建模。得到的“变形”有限元模型为浸渍复合材料结构的精确模拟提供了基础。本文介绍了覆盖和结构分析的建模技术，以及对一个相对大尺寸半球复合材料零件研究的验证结果。
To date macro-analysis methods have been invariably used to analyse textile composite structures for forming and mechanical performance. Techniques such as geometric 'mapping' for the draping of textile fabrics and classical laminate analysis combined with simplified failure criteria to determine mechanical performance have formed the basis of most of these methods. The limited accuracy of the physical laws applied is appropriate to macro-analysis methods in which the fibre-matrix composite is treated as homogeneous medium. Today, however, modern high performance computers are opening new possibilities for composites analysis in which far greater detail of the composite constituent materials may be made. This paper presents Finite Elements techniques for the draping simulation of textile composites, specifically biaxial Non Crimp Fabrics, in which the complex deformation mechanisms of the dry tows and stitching may be properly modelled at the individual tow and stitch meso-level. The resulting 'deformed' Finite Element model is then used to provide a basis for accurate simulation of the impregnated composite structure. The modelling techniques for both draping and structural analysis are present, together with validation results for the study of a relatively large-scale hemisphere composite part.