Experimental study demonstrates extended fatigue life in AA6063-T6 adjacent fastener holes, indicating enhanced durability for aerospace structures.
The noncontact electromagnetic cold expansion (EMCE) process using Lorentz force is promising for enhancing fastener hole fatigue performance, yet its application to adjacent holes remains limited. This study systematically investigates the fatigue behavior of AA6063‐T6 components with two adjacent holes treated by EMCE via dual‐frequency discharge. Numerical simulations and experiments demonstrate uniform hole expansion from 6.00 to 6.10 mm, accompanied by a peak residual compressive stress of −235 MPa around each hole. Fatigue tests reveal that the EMCE‐treated samples achieve fatigue lives 6.08 and 2.33 times longer than untreated samples under stress loads of 120 and 130 MPa, respectively. Microstructural analysis shows significant plastic strain between adjacent holes but no pronounced grain refinement. These findings confirm EMCE as an effective, practical technique for strengthening adjacent fastener holes in aerospace structures, providing critical technical support for its engineering application.
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Yang et al. (2026) studied this question.
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