以野燕麦主芒的厚壁纤维细胞为对象,根据其微观组织结构,建立各向异性的纤维缠绕圆管状体力学模型,导出纤维细胞在湿度载荷作用下的本构关系,分析微纤丝角、壁厚和湿度条件对应变和应力分布的影响.结果表明,纤维缠绕结构在湿度变化时的各向异性膨胀将引起管状体的轴向伸长和环向扭转,通过比较这些变形与微纤丝角之间的关系,发现微纤丝角范围为60°～80°时管状体具有稳定的变形能力.
According to the microstructure of the thick-wall fiber cells of wild oat awns,a mechanical model of filament-wounded anisotropic tubular body was established and the constitutive relation of the fibroblasts under humidity load was derived.The effects of the microfibril angle,cell wall thickness and humidity conditions on strain and stress distribution were also analyzed.The results show that the anisotropic expansion of the filament-wound structure during the moisture changing can cause axial elongation and circumferential torsion of the tubular body.By comparing the relationship between deformations and microfibril angle,it is found that the microfibril angle of the model with stable deformation is laid in the range of 60°-80°.
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