The use of digital image correlation in a parametric study on the effect of edge distance and thickness on residual strains after hole cold expansion

被引:20
作者
Backman, D. [1 ]
Liao, M. [1 ]
Crichlow, L. [1 ]
Yanishevsky, M. [1 ]
Patterson, E. A. [2 ]
机构
[1] Natl Res Council Canada, Inst Aerosp Res, Ottawa, ON K1A 0R6, Canada
[2] Michigan State Univ, Dept Mech Engn, E Lansing, MI 48824 USA
关键词
digital image correlation; hole cold expansion; residual strain; experimental methods;
D O I
10.1243/03093247JSA448
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The paper presents the results of an experimental study that used digital image correlation to measure the residual strains created by hole cold expansion both before and after insertion of an interference fit fastener. The study used 7075-T6 aluminium test coupons with multiple fastener holes to more closely simulate a real aircraft structure where multiple fastener holes are often cold expanded sequentially and where the interactions between the holes are a function of both the hole-to-free-edge distance as well as the pitch between the fastener holes. Both hole-to-free-edge distance and coupon thickness were varied to measure their effects on residual strain after hole cold expansion and after hole cold expansion and interference fit fastener insertion. The results showed that as the edge distance was decreased, the tensile strains at the low edge side of the coupon increased exponentially for both thick (6.35 mm) and thin (1.59 mm) coupons.
引用
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页码:781 / 789
页数:9
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