锻压技术

香菇菌渣致密成型过程中颗粒黏结和断裂研究

英文标题：Study on particle bonding and fracture during dense forming process of mushroom residue

分类号：TK6

出版年,卷(期):页码：2023,48(12):188-195

摘要：

为研究香菇菌渣颗粒致密成型过程中的颗粒接触黏结和断裂特性，进行了单轴压缩力学实验及声发射信号的检测，同时使用离散元软件PFC进行模拟分析，探究了香菇菌渣颗粒的接触黏结断裂、力链网络特性和不同孔隙率下的应力-应变曲线、颗粒组构变化等。结果表明：声发射计数随应力的增加而增加，至少有88.28%的声发射计数是由张拉型黏结断裂所贡献的；在应变为0.2、0.3、0.4和0.5时，力链数量分别递增为6304、7076、8080和9258，持续的压力作用增强了颗粒之间的胶结；在孔隙率为0.36、0.38和0.40时，接触数目分别增加了64.78%、66.55%和70.39%；张拉型黏结断裂数目分别占总数目的85.67%、90.20%和88.28%，远大于剪切型黏结断裂数目，颗粒更倾向于在垂直90°左右的方向上发生断裂。

In order to study the contact bonding and fracture characteristics of particles during the dense forming process of mushroom residue,the uniaxial compression mechanical experiment and the detection of acoustic emission signals were carried out. Then, the simulation analysis was conducted by using the discrete element software PFC, and the contact bonding fracture of the mushroom residue particles, the characteristics of forcechain network, the stress-strain curves under different porosities, and the changes of particle structure were investigated. The results show that the acoustic emission counts increase with the increasing of stress, and at least 88.28% of the acoustic emission counts is contributed by tensile bonding fracture. When the strains are 0.2, 0.3, 0.4 and 0.5, the number of force chains increases to 6304, 7076, 8080 and 9258, respectively, and the continuous pressure enhances the bonding between particles. When the porosies are 0.36, 0.38 and 0.40, the number of contacts increases by 64.78%, 66.55% and 70.39%, respectively. The number of tensile fractures accounts for the total number of 85.67%, 90.20% and 88.28% respectively, which are much larger than the number of shear bonding fractures, and the particles are more inclined to fracture in the vertical direction of about 90°.

基金项目：

国家自然科学基金资助项目（52366018）；内蒙古自治区高等学校科学研究项目（NJZY23074）

作者简介：李震（1973-），男，博士，教授 E-mail：lizhen_730106@126.com 通信作者：张鑫宇(1979-)，女，硕士，讲师 E-mail：zxy_lhb@163.com

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