| Citation: | SHI Duoqi, ZHANG Hengbin, LI Zhenlei, et al. Effect of nonuniform stress between holes on failure behavior of thin plate with holes[J]. Journal of Aerospace Power, 2022, 37（11）：2353-2361 doi: 10.13224/j.cnki.jasp.20220190
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In view of the problem of creep-fatigue cracking caused by thin-walled structure with dense holes in gas turbine engine, the DZ125 thin-walled plate specimens with holes were designed, and the creep-fatigue test was carried out at 850 ℃. Based on the elastic-plastic finite element analysis results of double-hole thin plate, the maximum stress path between two holes was defined as the critical area, and the equivalent stress between holes describing the complex stress state of the plate with holes was proposed. The finite element analysis and test results illustrated that the non-uniform stress between holes is the key factor to determine the cycle life; the cycle life decreased with the increase of the equivalent stress between holes. In addition, the tensile stress along the loading direction is the dominant stress of creep-fatigue failure of thin plate with holes; and the crack was originated from the high stress area of edge holes. Finally, when the the ratio of distance between adjacent holes to the diameter was about 4.22, the equivalent stress changed significantly, so the parameter should be controlled above this critical value in the design.
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