蓖麻蒴果力学特性的有限元分析

Finite element analysis on mechanical properties of castor-capsule

以淄蓖麻五号为研究对象,对蓖麻蒴果断面形状及结构特点加以描述和测量,并应用有限元分析方法对蓖麻蒴果在压载作用下顶部和中部的应力分布进行分析,建立了蓖麻蒴果几何模型和有限元模型.研究结果表明:蓖麻蒴果果壳破裂的主要原因是由最大拉应力引起果壳破裂.顶部压载荷作用时,最大拉应力的位置在蒴果果柄顶部中缝处,拉应力引起中果皮内面产生裂纹;而中部压载荷作用时,最大拉应力的位置出现在蒴果中果皮中缝的两端,拉应力也引起中果皮四周角靠近直线处的内面产生裂纹.

The Zi castor 5 was selected as sample study, the size of the section of capsule was measured, and the shape of section and the character of structure were described. The stress distribution from top and middle of castor-capsule under pressing loads by finite element method was analysed. The geometric model and finite element model with the measured results for castor-capsule were established. The results show that the rupture of castor-capsule shell is mainly caused by maximum tensile stress. The position of maximum tensile stress is at middle raphe of the top of castor-capsule when top pressing loads were applied, and the inside of the middle peel cracked due to tensile stress. The position of maximum tensile stress is at two ends of middle raphe of middle peel when middle pressing loads were applied, the inside of four perigon of middle peel near the line cracks due to tensile stress.