水射流破碎钴结壳过程

来源期刊:中南大学学报(自然科学版)2011年第z2期

论文作者:黄中华 谢雅

文章页码:289 - 294

关键词:钴结壳;水射流;SPH方法;破碎过程

Key words:cobalt crusts; water jet; SPH method; crushing process

摘    要:为获取水射流破碎钴结壳的工作机理,建立基于SPH方法的钴结壳水射流破碎过程数值仿真模型。通过仿真研究获取水射流破碎钴结壳的工作机理和水射流压力与钴结壳破碎深度的关系。仿真结果表明:在水射流破碎钴结壳的过程中,水射流首先在钴结壳的表面产生挤压破碎形成初始裂纹。当初始裂纹产生后,在钴结壳的内部会产生拉伸破碎和剪切破碎,进而加速钴结壳的破碎;水射流破碎钴结壳的过程中存在一个“门槛压力”,当水射流压力小于“门槛压力”时,水射流不能破碎钴结壳,当水射流压力大于“门槛压力”时,随着水射流压力的增加,钴结壳破碎孔的深度迅速增加;水射流破碎钴结壳模拟料的实验结果表明:仿真结论与实验结果吻合,水射流破碎钴结壳模拟料的“门槛压力”为5 MPa;当水射流的压力大于5 MPa后,随着水射流压力的增加,水射流的破碎能力显著提高。

Abstract: Simulation model of cobalt crusts crushing process with water jet was established based on SPH method. With simulation research, crushing mechanism of cobalt crusts with water jet and the relationship between water jet pressure and crushing depth were obtained. Simulation results show that during the crushing process of cobalt crusts, the initial crack on the surface of cobalt crusts is generated by pressing crush. When the initial crack is formed, tensile crack and shear crack are generated in the inner of cobalt crusts and accelerate the crushing process. A threshold pressure exists in cobalt crusts crushing process with water jet. When the water jet pressure is less than the threshold pressure, surface crack can not be generated. When water jet pressure is larger than the threshold pressure, crushing hole depth increases quickly with the water pressure increasing. Experiments of water jet crushing cobalt crusts were carried out to validate the simulation results. The experiment results show that simulation results are consistent with the experiment results. The threshold pressure of water jet crushing cobalt crusts simulation material is 5 MPa. When water jet pressure is larger than 5 MPa, the crushing hole depth increases obviously with the increase of the water jet pressure.

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