STUDY ON ANALYSIS METHOD FOR DFR OF THE TYPICAL LAPPED JOINT IN AIRFRAME

A method for solving DFR(detail fatigue rating) of the structural lap joints is presented,which determines the DFR value of the structure through estimating the most dangerous hole location by solution of the finite element model or static tensile experiment,and combining the stress concentration factor Kt correction to the concerned fastening hole.Fatigue life analysis of the typical lap joint in airframe was carried out using this DFR method and the detail of analysis process and results were given,the validity and rationality of this method were demonstrated by the results of the DFR experiment.