226 



TABLE 202.— MECHANICAL PROPERTIES OF WHITE METAL BEARING ALLOYS 



(BABBITT METAL) 



Experimental permanent deformation values from compression tests on cylinders 31.8 mm 

 (l{ in.) diam. by 63.5 mm (2^ in.) long, tested at 21°C (70°F). (Set readings after removing 

 loads.) 



TABLE 203.— RIGIDITY MODULUS FOR A NUMBER OF MATERIALS 



If to the four consecutive faces of a cube a tangential stress is applied, opposite in direction on 

 adjacent sides, the modulus of rigidity is obtained by dividing the numerical value of the tangential 

 stress per unit area (kg/mm 2 ) by the number representing the change of angles on the nonstressed 

 faces, measured in radians. 



Rigidity 

 Substance modulus 



Aluminum 3350 



" cast 2580 



Brass 3550 



3715 



" cast, 60 Cu + 12 Sn.. 3700 



Bismuth, slowly cooled.... 1240 



Bronze, cast, 88 Cu + 12 Sn. 4060 



Cadmium, cast 2450 



Copper, cast 4780 



4213 



4450 



4664 



Cold 2850 



" 3950 



Iron, cast 5210 



Rigidity 

 Substance modulus 



Iron, cast 6706 



7975 



6940 



8108 



7505 



Magnesium, cast 1710 



Nickel 7820 



Phosphor bronze 4359 



Quartz fiber 2888 



" 2380 



Silver 2960 



2650 



2566 



" hard-drawn 2816 



Steel 8290 



Rigidity 

 Substance modulus 



Steel cast 7458 



" cast, coarse gr 8070 



" silver- 7872 



Tin, cast 1730 



1543 



Zinc 3880 



" 3820 



Platinum 6630 



6220 



Glass 2350 



2730 



Clay rock 1770 



Granite 1280 



Marble 1190 



Slate 2290 



SMITHSONIAN PHYSICAL TABLES 



