| 基于非局部理论的超声作用下纳米复相陶瓷材料疲劳试验研究 |
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| 引用本文： | 谢萍,赵波. 基于非局部理论的超声作用下纳米复相陶瓷材料疲劳试验研究[J]. 机械科学与技术, 2010, 0(5) |
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| 作者姓名： | 谢萍 赵波 |
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| 作者单位： | 河南理工大学机械与动力工程学院; |
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| 摘 要： | 为了解释超声磨削的高效延性切削现象,进行了纳米复相陶瓷材料在对称循环应力(R=-1)下普通及超声振动条件下的疲劳寿命试验,得到其在两种条件下的循环疲劳特性曲线。基于非局部理论,选取了相应的二维衰减核函数,建立了超声下的非局部本构模型,分析了超声振动作用对纳米复相陶瓷材料的力学行为及断口微观特性的影响规律。试验结果表明:试件在给定频率范围内的超声振动作用下,循环应力幅值明显降低,说明超声振动作用对相同疲劳寿命时所需循环应力幅有衰减作用;对断裂后不同超声频率、相同疲劳寿命的试件断口微观形貌分析表明,超声振动作用改变了材料微观组织结构,使材料的韧性增强,断裂方式发生改变,这些力学性能使超声磨削时的临界磨削深度比普通磨削时大。试验结果与理论分析相吻合。
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| 关 键 词： | 超声振动 纳米复相陶瓷 疲劳特性 非局部理论 |
A Study of the Fatigue Life of Nano-composite Ceramics |
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| Xie Ping,Zhao Bo. A Study of the Fatigue Life of Nano-composite Ceramics[J]. Mechanical Science and Technology for Aerospace Engineering, 2010, 0(5) |
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| Authors: | Xie Ping Zhao Bo |
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| Affiliation: | Department of Mechanical Engineering/a>;Henan Polytechnic University/a>;Jiaozuo 454000 |
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| Abstract: | In order to explain the high efficiency ultrasonic ductile grinding cutting phenomenon,the fatigue properties of nano-composite ceramics are studied in the asymmetric stress cycle(R=-1) under ordinary condition and the condition of ultrasonic vibration,and the cycle fatigue curves under the two conditions are obtained.To explain the effect of ultrasonic vibration on the mechanical behaviors and micro-fractures characteristics,nonlocal theory is introduced to establish the non-local constitutive model under ... |
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| Keywords: | ultrasonic vibration nano-composite ceramics fatigue properties nonlocal theory |
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