Fatigue and Corrosion-fatigue Properties of Wrought Copper and Copper-base Alloys 311 



TABLE 12 

 60-40 OR MUNTZ METAL 



' Corrosion-fatigue limit, salt water, 17,000 p.s.i. for 10' cycles. 



b Torsion strength 55,000 p. 

 " Torsion strenRth 50,000 p. 

 <* Torsion strength 45,500 p.s.i. 



; angle of twist 31 deg.; torsion endurance limit 5,500 p.s.i. for 5 X 10^ cycles. 

 ; angle of twist 99 deg.; torsion endurance limit 7,500 p.s.i. for 2 X 10' cycles. 

 ; angle of twist 125 deg.; torsion endurance limit 8,500 p.s.i. for 5 X 10' cycles. 



TABLE 13 

 LEADED BRASSES 



*• Torsion endurance limit 14,000 p.s 

 ^ Specimens had a 45-deg. notch. 



