Abstract:

In order to satisfy the requirements of durability evaluation of multiple details structure in the process of aircraft structure life evaluation, based on the probability fracture mechanics approach of durability analysis, a method is presented to calculate the structural total crack exceedance. Structural total crack exceedance is accumulative total directly of each type of details when the types are of details are same, and it is accumulative total by weight of each type of details when the types of details are different. Accordingly, a durability evaluation approach of multiple details structure is established.Aiming at similar details structure which exist in engineering in large amounts,the S-N curve and stress serious factor approaches that the calculating equivalent relations of similar details in engineering are presented.Especially,the S-N curve approach can save much test work and have enough reliability,and thus have important application value.It has been successfully applied to the durability evaluation of aircraft structure.

Key words: aircraft , structure,  , durability,  , fracture , mechanics,  , multiple , details , structure,  , life , evaluation