Experimental Study on R-angle Eddy Current Detection of Cast Aluminum Alloy Members

Author of the article:WANG Hongliang, LU Xinliang

Author's Workplace：State-owned Wuhu Machinery Factory, Wuhu 241000, China

Key Words：rangle area; shielding layer; excitation frequency; silicon steel; detection amplitude

Abstract：Aiming at the difficult problem of detecting the R-angle region of aircraft structure, a die-cast aluminum alloy R-angle eddy current detection probe was designed and developed. Combining with the actual detection condition of R-angle, it was proposed to use silicon steel as the shield layer of eddy current probe, which can effectively shield the influence of metal on the detection signal. In order to realize the rapid and reliable detection of the crack in the R-angle region of the aircraft structure, the optimum detection frequency was determined. The results show that when the excitation frequency is 400 kHz, the detection signal amplitude reaches the maximum. The developed shielded eddy current probe can effectively detect the artificial defects with crack parameters of 5.00 mm×0.13 mm×0.20 mm (length×width×depth), and can accurately locate the defects. It provides the basis for quantitative detection of R-angle crack in aircraft cast aluminum alloy.