Abstract:

A study of crack prevention under tensile load is performed on an aluminum alloy 2A12 specimen with an oblique spatial crack by using electromagnetic heating online. Crack preventing technical parameters are determined by numerical analysis，and the temperature field and thermal stress field are obtained after discharge. By using a selfprepared homemade loading device and the super pulse current generating equipment of ZL-2, the spatial crack preventing experiment is carried out by electromagnetic heating online. Microstructure analysis and macroscopical mechanical property test are performed on the aluminum alloy specimen pre and post prevention. Results show that at the time of pulse current discharging, the crack tip melts, dulls and forms a compressed stress area, which increases the propagation work of the crack. The crack will not propagate even with a certain amount of tensile load; thus the formation of the main crack source will be prevented.

Key words: electromagnetic , heating,  , spatial , crack,  , crack , preventing,  , microstructure,  , mechanical , property