超声载荷下矿物组分界面裂纹扩展特征研究  

Study on Interface Crack Propagation Characteristics of Mineral Components under Ultrasonic Load

作　　者：蔡改贫[1] 王炜锋 余成 CAI Gaipin;WANG Weifeng;YU Cheng(School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学机电工程学院,江西赣州341000

出　　处：《有色金属（选矿部分）》2024年第8期18-30,共13页Nonferrous Metals（Mineral Processing Section）

基　　金：国家自然科学基金资助项目(52364025)。

摘　　要：为研究多组分包裹性矿物受超声振动载荷作用下其界面处裂纹萌生演化过程及宏观破坏特征,以某黑钨矿石为研究对象,对其矿物组分界面开展超声振动试验;在此基础上,引入黏聚力单元构建符合矿物真实破裂特征的模型,采用试错法根据矿物组分界面原位静态加载试验获取的宏观力学参数及破碎形式对所构建模型的细观参数进行标定;并基于此模型探究振动参数对矿物组分界面裂纹扩展特征的影响。结果表明,随着超声载荷作用时间的增加,石英矿物内部微裂纹优先扩展进而产生宏观破裂,硅质岩矿物损伤较小。试验数据与模拟试验结果具有较高的吻合性,所构建的黏聚力模型能够较好地模拟矿石在超声振动下的破坏过程。矿物组分界面破碎分为裂纹萌生—裂纹聚集—裂纹扩展—宏观破坏四个阶段;矿物在加载端面主要以剪切破坏为主,并最终以拉伸破坏产生宏观裂纹;矿物组分界面破碎速率随振动频率或振幅的增加而增大,矿物组分界面破碎能耗随振动频率或振幅的增大而增大。In order to study the process of crack initiation and evolution at the interface of multicomponent inclusion minerals under the action of ultrasonic vibration loading and the macroscopic damage characteristics,a wolframite ore was taken as the research object,and ultrasonic vibration experiments were carried out on the interface of the mineral components.On this basis,the cohesion unit was introduced to construct a model in line with the real rupture characteristics of the minerals,and the trialand-error method was used to calibrate the constructed model based on the macroscopic mechanical parameters and crushing form obtained from the in-situ static loading test on the interface of the mineral components.The trial-and-error method is used to calibrate the microscopic parameters of the constructed model according to the macroscopic mechanical parameters obtained from the in situ static loading test of the mineral component interface and the fracture form.And the influence of vibration parameters on the crack extension characteristics of the mineral component interface is investigated based on this model.The results show that with the increase of ultrasonic loading time,the microcracks inside the quartz minerals preferentially expand to produce macroscopic rupture,and the siliceous minerals are less damaged.The experimental data are in good agreement with the simulation results,and the cohesive force model can better simulate the damage process of the ore under ultrasonic vibration.Mineral component interface crushing is divided into four stages:crack initiation-crack aggregation-crack expansion-macroscopic damage;the minerals are mainly damaged by shear damage at the loading end face,and ultimately,the macroscopic cracks are produced by tensile damage.The mineral component interface crushing rate increases with the increase of the vibration frequency or amplitude.And the mineral component interfacial crushing rate increases with the increase of vibration frequency or amplitude,mineral component interfacial crushi

关 键 词：超声载荷 黏聚力模型 矿物组分界面 裂纹扩展 

分 类 号：TD912[矿业工程—选矿]