1873.] Preservation of Iron Ships, fyc. 261 



Experiments on the Ultimate Eesistance of Eivets to Shearing. 



No. of experiments. 



Diameter of rivet, in 

 decimals of an inch. 



Sectional area of 

 rivet, in decimals 

 of a square inch. 



Shearing resistance 

 of rivet, in tons. 



Shearing resistance, 

 in tons per square 

 inch. 



Elongation of joint, 

 in dec. of an inch. 



T-? Am ■» viz a 



1. 



•84 



•554 



10-819 



19-528 



•190 







Single shear ; punched holes ; machine- 















riveted. 



o 



•82 



• KOQ 



10*879 



20-o0b 





Single shear ; punched holes ; hand- 















riveted. 



Q 



o. 



OA 



•84 



OO'l 



10*zo7 



lO.CI A 



18*514 



•1DO 



Single shear ; drilled holes ; machine- 















riveted. 



A 



.on 





1U lov 



on.ooo 

 JXj'OOV 





Single shear ; drilled holes ; hand- 















riveted. 



5. 



•84 



•554 



11-221 



20-254 



•270 



SiticIa an pat* • nfillpH * prlcrpa r»f iV!p*fpQ 















rounded ; machine-riveted. 



6. 



•82 



•528 



11-192 



21-197 



•240 



Sincrlp jaTipai* • r^nripViprl •anrl mimfpv-snnlr * 



kj 111 J± iv OJLiC/Ct'l 3 J y.1 11 *L I l\_*_l dlLvX IU LllllCi.5U.llA. j 















hand-riveted. 



7. 



•84 



•554 



10-850 



19-584 



•160 



Single shear ; drilled and countersunk ; 















machine-riveted. 



8. 



•82 



•528 



11-234 



21-276 



•288 



Single shear ; drilled ; edges rounded ; 















countersunk ; hand-riveted. 



9. 



•82 



•528 



23-375 



44-270 



•340 



Double shear ; punched ; hand-riveted. 



10. 



•82 



•528 



20-684 



39-174 



•232 



Double shear ; drilled ; hand -riveted. 



11. 



•82 



•528 



24-313 



46-047 



•482 



Double shear ; drilled ; edges rounded ; 















hand-riveted. 



12. 



•82 



•528 



26-464 



50-121 





Double shear ; drilled ; edges rounded 















and countersunk ; hand -riveted. 















(This rivet did not shear. The plate 















broke away.) 



The general conclusions drawn by the author from his experiments are 

 as follows : — 



(1) Joints with drilled holes are iveaker and elongate less before fracture 

 than joints with punched holes. The average of four experiments on 

 joints with drilled holes, compared with the average of four experiments 

 on joints with punched holes, shows that the rivets in the former are 

 1*36 ton per square inch, or per cent., weaker than the rivets in the 

 latter. The elongation is also 26 per cent, less with drilled than with 

 punched holes. 



(2) Hand-riveted joints are somewhat stronger than machine-riveted joints. 

 The mean of three experiments on hand-riveted joints, compared with the 

 mean of three experiments on machine-riveted joints, shows an excess of 

 shearing resistance in the rivets in the hand-riveted joints amounting to 

 1-495 ton per square inch, or 7| per cent. The hand-riveted joint also 

 elongates 26 per cent, more than the machine-riveted joint. 



(3) There is a decided increase in the strength of the rivet when the edges 



