摘要
运用扫描电镜实验观察了金龟子外甲壳内部的微结构,发现其类似于人造纤维增强复合材料,具有几丁质纤维增强角质化蛋白质基体的结构特征。对其仔细观察发现其中存在非均匀的纤维铺层以及奇特的异型刺状和球形纤维。针对发现的异型刺状纤维结构,建立纤维端头模型,用有限元分析方法对其进行了应力和变形分析,结果表明刺状和球形端头纤维能显著地降低其端头界面剪应力集中现象,提高纤维增强复合材料抵抗变形破坏的能力,增加纤维增强复合材料的强度。分析结果对仿生复合材料的设计具有指导意义。
The microstructures of chafer cuticle are observed with a scanning electron microscope （ SEM）. It shows that the cuticle is a kind of chitin-fiber-reinforced composite with protein matrix. There are heterogeneous chitin-fiber layup and abnormal shape of fibers. The configuration and size of the chitin fibers in the cuticle are variational. Based on the observation, the analyses of the finite element on the composite elements with spinous-end, ball-end and plain-end fibers are conducted. The result shows that the composites with spinous-end and ball-end fibers have lower interface shearing stress than that of the composite with plain-end fiber. The result also shows that the composite with spinous-end fiber and ball-end has higher capability resisting failure. These conclusions can provide profitable guidance for the design of man-made advanced composites.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2006年第5期683-686,共4页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(10572157
10272120)
重庆市自然科学基金资助项目(2005BB4119)
关键词
金龟子壳
复合材料
异型纤维
应力和应变
有限元
Chafer cuticle
composite
abnormal fiber
stress and strain
finite element
