RIVETED JOINTS AND CONNECTIONS 



147 



each rivet is - Consequently the efficiency of this type of joint 



against rivet shearing is 



e = 



4 chp 



For an economical design these two efficiencies should be equal. For 

 practical reasons, however, it is not generally possible to make these 



L 



fl 



SINGLE-RIVETED LAP JOINT 

 EFFICIENCY 50-60 PER CENT 



SINGLE-RIVETED BUTT JOINT 

 EFFICIENCY 76-78 PER CENT 







DOUBLE-RIVETED LAP JOINT 

 EFFICIENCY 70-72 PER CENT 



DOUBLE-RIVETED BUTT JOINT 

 EFFICIENCY 82-83 PER CENT 



FIG. 105 



exactly equal, and in this case the smaller of the two determines 

 the strength of the joint. 



For a double-riveted lap joint the efficiency against tearing of 



the plate is c d 



