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工程科学与技术:2007,39(1):113-117
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微-纳米复合陶瓷超声振动磨削的塑性-脆性 转变特征研究
(1.上海交通大学 机械与动力工程学院,上海200030;2.中北大学 机械工程学院,山西 太原030051)
Brittle ductile Transition of Micro-nano Composite Ceramics Using Ultrasonic Vibration Grinding
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投稿时间:2006-06-12    
中文摘要: 基于工件超声振动磨削的单磨粒运动模型,建立超声振动磨削单磨粒最大切削厚度agmax公式;基于压痕断裂力学,给出硬脆材料超声振动磨削塑性-脆性转变临界条件,进行超声振动磨削与普通磨削对比试验,应用SEM和AFM分析陶瓷磨削表面微观形貌特征,重点研究磨削参数对其塑性-脆性转变特征的影响。研究结果表明,砂轮平均磨粒尺寸是影响塑性-脆性转变最为主要的因素,砂轮速度对其影响次之,磨削深度对塑性-脆性转变的影响最小;得出只有当agmax小于临界切削深度agc时,才能实现硬脆材料塑性域磨削的重要结论。
Abstract:The motion model of the contact between abrasive particle and workpiece in two-dimension ultrasonic vibration grinding was analyzed, the maximum cutting depth of a grain were obtained. Based on indentation fracture mechanics, the critical condition of ultrasonic vibration grinding brittle-ductile transition was analyzed theoretically. The ultrasonic vibration and conventional diamond grinding of Al2O3-ZrO2(n) ceramics were performed in order to investigate the effect of ultrasonic vibration grinding conditions on the brittle-ductile transition mechanism, the micro-topography of the grinding surface were observed by AFM and SEM. Experiment results indicated that only when the maximum cutting depth of a grain less than critical depth, ductile regime grinding of ceramics can be realized, the grit size, workpiece velocity and grinding depth can affect the brittle-ductile transition.
文章编号:20070123     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(50475060);河南省创新人才基金资助项目(省重大项目0421001200)
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吴雁,孙爱国,朱训生.微-纳米复合陶瓷超声振动磨削的塑性-脆性 转变特征研究[J].工程科学与技术,2007,39(1):113-117.
.Brittle ductile Transition of Micro-nano Composite Ceramics Using Ultrasonic Vibration Grinding[J].Advanced Engineering Sciences,2007,39(1):113-117.