对低周疲劳寿命有重要影响试验参数的确定方法
A Determination Method of Important Affecting Parameters on Low Circle Fatigue Life
摘 要
运用粗糙集理论中的数据推理方法,对2.25Cr-1Mo钢的低周疲劳试验数据进行分析,找出了对疲劳寿命有重要影响的试验参数.首先对数据做对数处理,然后对处理后的数据数列做减法处理,又用确定数据的有效位数等方法建立了数据的决策表;最后从总应变、弹性应变、塑性应变以及应力幅等4个参数中,确定出塑性应变是对疲劳寿命有重要影响的参数;证明了疲劳寿命可以近似表示成塑性应变的函数关系式,同时验证了该方法对确定低周疲劳试验重要影响参数的有效性.
粗糙集
推理方法
low circle fatigue
rough set
inference method
Abstract
According to the inference method of rough set,the low circle fatigue experiment datas for the 225Cr-1Mo steel were analyzed to find out the important affecting parameters on the fatigue life.Firstly the experiment datas were taken logarithm.Secondly the serious datas were treated by the subtract algorithm.Then the numerical digit of the datas was determined and the decision table was built.Finally the most important parameter,the plastic strain was determined from four parameters such as total strain,plastic strain,elastic strain and stress amplitude.The results proved that the fatigue life was able to be expressed as a function of the plastic stain and the method presented in this paper was effective for determining important parameters in the low circle fatigue experiment.
中图分类号 O159
所属栏目 试验研究
基金项目 国家“863”计划资助项目(2006AA04Z425);教育部新世纪优秀人才计划资助项目(NCET-06-0414);上海市重点学科建设资助项目(B503)
收稿日期 2007/11/27
修改稿日期 2008/3/20
网络出版日期
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备注刘长虹(1957-),男,湖北武汉人,教授,博士.
引用该论文: LIU Chang-hong,XUAN Fu-zhen. A Determination Method of Important Affecting Parameters on Low Circle Fatigue Life[J]. Materials for mechancial engineering, 2008, 32(12): 22～24
刘长虹,轩福贞. 对低周疲劳寿命有重要影响试验参数的确定方法[J]. 机械工程材料, 2008, 32(12): 22～24
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参考文献
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【4】Pawlak Z.Rough sets,decision algorithms and Bayes theorem[J].European Journal of Operational Research,2002,136:181-189.
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