织物剪切对盔壳复合材料弯曲性能的影响研究
Study on the Effect of Fabric Shear Deformation on the Bending Properties of Helmet Shell Composites
高世望 1齐业雄 1李妙1
作者信息
摘要
飞行员头盔的佩戴和摘下都需要盔壳在弹性范围内发生一定的变形,通过工艺设计合理调整壳体刚度可提高头盔舒适性.本文研究了纬编双轴向织物的剪切变形对其增强的复合材料板材弯曲性能的影响.采用划区域方法研究了织物在头盔不同位置的变形情况,通过万能材料试验机和超景深显微镜对复合材料的力学性能及损伤形貌进行表征.结果表明,复合材料的弯曲刚度受剪切变形影响较大,随剪切角增大表现为先上升后下降再升高的趋势.复合材料的弯曲强度受剪切变形影响较小,当剪切角为20°～30°时,复合材料的弯曲强度降至最低.本文研究证实利用织物的剪切变形可有效调整复合材料的刚度,可为头盔壳体刚度的优化设计提供参考.
Abstract
Pilot's helmet wearing and removing need shell in the elastic range of a certain deformation.Through the process of designing a reasonable adjustment of the shell stiffness the comfort of the helmet can be improved.In this paper,the effect of shear deformation of multilayered biaxial weft knitted fabrics on the flexural properties of composite sheets reinforced by them is investigated.The deformation of the fabric at different positions of the helmet was investigated using the zoning method.Mechanical properties and damage morphology of composites by universal testing machine and ultra-depth three-dimensional microscope was characterized.The results show that the bending stiffness of the composites is greatly affected by the shear deformation,which shows a tendency of first increasing,then decreasing and then increasing with the increase of the shear angle.The bending strength of composites is less affected by shear deformation and is minimized when the shear angle is between 20° and 30°.This paper confirms that the stiffness of composites can be effectively adjusted by using the shear deformation of fabrics,which can provide a reference for the optimized design of helmet shell stiffness.
关键词
复合材料/头盔壳体/剪切角/弯曲刚度/纬编双轴向织物Key words
composite/helmet shell/shear angle/bending stiffness/multilayered-connected biaxial weft knitted引用本文复制引用
基金项目
航空科学基金(202000290Q2001)
出版年
2024
国家科技期刊平台
NSTL
万方数据