Experimental study on the effect of different fatigue loading method on the property of metal cantilever beam

icaf2023 Tracking Number 26

In order to investigate the influence of different fatigue loading methods on the property of metal cantilever, the resonant fatigue testing system and the corresponding conventional fatigue testing system were designed respectively based on the electromagnetic vibration table, and the bending fatigue tests were conducted on LY12CZ aluminum alloy cantilever beam specimens. A special progressive analysis based on damage equivalence was used to obtain S-N curves under resonance environment in the range of 1×105-1×107 cycles. The results show that the fatigue limit of LY12CZ aluminum alloy under bending resonance environment is 74.6MPa and the fatigue limit under conventional condition is 76.2MPa at 1×107cycles. When the number of cycles is less than 5×106, the bending resonant fatigue property of LY12CZ aluminum alloy is significantly different from the conventional fatigue property, while in the range of 5×106-1×107cycles, there is little difference between the two properties.