铝合金预腐蚀剩余寿命的分形维数预测方法  

Prediction of Residual Life of Pre-corrosion Aluminum Alloy with Fractal Dimension

作　　者：张川[1] 姚卫星[2] 

机构地区：[1]南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京210016 [2]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《中国机械工程》2013年第17期2337-2340,共4页China Mechanical Engineering

基　　金：江苏省"青蓝工程"科技创新团队资助项目(1001-YPB11001);江苏高校优势学科建设工程资助项目

摘　　要：试验得到在EXCO溶液中预腐蚀不同时间的LC4CS光滑试件的腐蚀表面轮廓线和剩余疲劳寿命。分析了预腐蚀剩余寿命和断口附近轮廓线分形维数随预腐蚀时间的变化规律,针对该规律选取分形维数为预腐蚀剩余寿命损伤参量。试验结果表明:断口附近腐蚀表面轮廓线的分形维数受腐蚀形貌分散性的影响较小,与剩余寿命呈线性关系且与载荷无关,由分形维数计算得到的剩余寿命处于二倍分散带之内。Several smooth specimens of aluminum alloy LC4CS soaked in EXCO solution for dif- ferent time were measured to obtain corrosion surface profiles and then tested to obtain residual life. The relationship between pre--corrosion residual life and fractal dimension of profile near fracture for different pre--corrosion time were discussed. Fractal dimension was selected as pre--corrosion dam- age parameter on residual life. The results show that fractal dimension of corrosion surface profile near fracture is influenced little by dispersion of corrosion surface, and there is a linear relationship between fractal dimension and residual life, which is not related with loading. The residual lives cal- culated by fractal dimensions are in twice scatter band.

关 键 词：预腐蚀 损伤参量 分形维数 剩余寿命 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG115.9[金属学及工艺—金属材料]