Finite Element Analysis of Mechanical Properties of 3D Four-Directional Rectangular Braided Composites Part 1: Microgeometry and 3D Finite Element Model |
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| Authors: | Dian-sen Li Jia-lu Li Li Chen Zi-xing Lu Dai-ning Fang |
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| Affiliation: | 1.School of Aeronautical Science and Technology,Beijing University of Aeronautics and Astronautics,Beijing,People’s Republic of China;2.AML, School of Aerospace,Tsinghua University,Beijing,People’s Republic of China;3.Key Laboratory of Advanced Textile Composite Materials of Ministry of Education,Tianjin Polytechnic University,Tianjin,People’s Republic of China |
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| Abstract: | Based on the microstructure of three-dimensional (3D) four-directional rectangular braided composites, a new parameterized
3D finite element model (FEM) is established. This model precisely simulates the spatial configuration of the braiding yarns
and considers the cross-section deformation as well as the surface contact due to the mutual squeezing in the braiding process.
Moreover, it is oriented in the same reference frame as the composites, which coincides with the actual configuration of 3D
braided composites and facilitates the analysis of mechanical properties. In addition, the model investigates the relationships
among the structural parameters, particularly the braiding angle and the interior braiding angle, which were not taken into
account in the previous models. Based on the parameterized FEM, the structural geometry of the composites is analyzed and
some conclusions are drawn herein. Good agreement has been obtained between the calculated and measured values of the geometric
characteristics of braided composite samples. |
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