单 位：
东北林业大学机电工程学院;塔里木大学机械电气化工程学院;塔里木大学生命科学学院
摘 要：
为提高核桃机械化破壳效果,通过机械法破碎温185核桃的核桃壳,采用环境扫描显微镜(SEM)对裂纹断面进行观察,并根据材料脆性断裂原理对核桃脆裂断面进行分析。结果表明:根据核桃壳体细胞断裂形貌的差异可以分为内外两层,外层细胞尺寸小、密度大,内层细胞尺寸大、密度小,且外层区域的厚度是内层区域厚度的2倍左右;核桃壳不同部位的断面组织形态相似,存在天然的壳沟刻纹、缝隙、杂质、孔洞等裂纹形核特征,这些特征是导致核桃壳体受载荷后裂纹萌生的原因;对核桃的端部和横向腹部施加冲击载荷作用,可以增强核桃破壳局部破碎率,在核桃破壳时容易实现壳仁分离。
译 名：
Analysis on the embrittlement mechanism of Wen-185 walnut shell based on the cellular tissue
作 者：
ZHANG Hong;MA Yan;GUO Wen-song;ZHANG Rui;LI Yong;College of Electromechanical Engineering,Northeast Forestry University;College of Mechanic and Electrical Engineering,Tarim University;College of Life Science,Tarim University;
关键词：
Wen 185walnu;;machinery breaking;;embrittlement;;mechanism
摘 要：
In order to improve the effectiveness of mechanized walnut shell breaking,a mechanical method was adopted to break Wen 185walnut shell,and the scanning microscopy(SEM)was used to observe the fracture of the walnut shell.The characteristics of the walnut brittle fracture were investigated based on the theory of brittle fracture.The results showed that the walnut shell consists of two layers because its cell fracture revealed different patterns;the cells in the outer layer had small dimension and large density while the cells in the inner layer were just the opposite.The outer region was about 2 times as thick as the inner region.The morphology of the walnut shell fracture in different parts was similar,with natural shell ditch marking,cracks,impurities,holes and other crack features.These features were the cause of the walnut shell crack under load.Exerting shock loads on ends and transverse abdomen of the walnut shell could increase the broken rate of part of walnut shell.Moreover,walnut shell and kernel were separated much more easily.
