论文摘要
为了将细节疲劳额定值(DFR)法的适用范围扩展到腐蚀条件下,采用腐蚀折算系数对DFR进行当量折算的方法,建立了基于Gerber模型的DFR法在腐蚀条件下的分析方法,并通过腐蚀折算系数的分解使此法可用于单独研究地面预腐蚀和空中腐蚀疲劳对DFR的影响。通过设置九组不同时长(0 h、6 h、12 h、24 h、36 h、72 h、108 h、144 h和180 h)的预腐蚀疲劳试验,测定了2024-T3铝合金的地面停放腐蚀折算系数;比较了基于Gerber模型和Goodman模型的DFR法在一般条件和腐蚀条件下的计算结果。结果表明:随着预腐蚀时间的延长,2024-T3铝合金的细节疲劳额定值截止值(DFRcutoff)下降;在九组不同时长下,基于Gerber模型计算的DFRcutoff依次为84.251 MPa、84.722 MPa、79.683 MPa、80.745 MPa、77.026 MPa、74.996 MPa、75.613 MPa、76.186 MPa和73.798 MPa,地面停放腐蚀折算系数为1、1.006、0.946、0.958、0.914、0.890、0.897、0.904、0.876,拟合得到DFRcutoff与预腐蚀时长满足:DFRcutoff=84.521[lg(t+10)]-0.149 8。在未考虑腐蚀影响的条件下N95/95>105时,考虑腐蚀影响的条件下N1>105时,基于Gerber模型计算的DFR均大于基于Goodman模型的计算结果。
论文目录
文章来源
类型: 期刊论文
作者: 陈跃良,吴省均,卞贵学,张勇,王安东,黄海亮,张柱柱
关键词: 预腐蚀疲劳试验,细节疲劳额定值,腐蚀折算系数
来源: 材料导报 2019年16期
年度: 2019
分类: 工程科技Ⅰ辑,工程科技Ⅱ辑
专业: 金属学及金属工艺,航空航天科学与工程
单位: 海军航空大学青岛校区
基金: 国家自然科学基金(51375490)~~
分类号: TG172;V216.3
页码: 2793-2798
总页数: 6
文件大小: 1150K
下载量: 42
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