Fatigue and Corrosion-fatigue Properties of Wrought Copper and Copper-base Alloys 309 



TABLE 10 

 70-30 CARTRIDGE BRASS 



« Notched endurance limit, 20,000 p.s.i. for 10^ cycles (notch 0.05-mm. radius, 0.2 mm. deep). 

 *> Notched endurance hmit, 22,500 p.s.i. for 10' cycles (notch 0.05-mm. radius, 0.2 mm. deep), 

 e Torsion strength 41,000 p.s.i.; angle of twist 575 deg.; torsion endurance limit 9,000 p.s.i. for 4 X 10' cycle; 

 3h) water, 13,000 p.s.i. for lO^ cycles. 



<^ Corrosion-fatigue limit, salt water (brackish), 9,000 p.s.i. for 5 X 10' cycles. 

 ' Corrosion-fatigue limit, salt water (brackish), 12,500 p.s.i. for 6 X 10' cycles. 



-fatigue limit, both fresh and salt (brack- 



