594 



Professor Ernest G. Coker 



Shear Tests. 



[Feb. 18, 



Shear tests are usually made upon Ijars of rectangular or circular 

 crosfsectiont gripped in such a manner that shear stress is applied 

 Ttwo simna and equal sections at a finite distance apart, and load 



Fig. 12. 



In 



is applied until the material is sheared across ^'^'^^e sections 

 this way a mean value of the shear stress at 1"?^"^.''°,*'' fof 

 whicli is of some value, but it affords little, or no '"f «J f"" f ^''^' J, 

 the behaviour of the material up to the elastic lim t J' ^««=™ 

 probable that the assumption of uniform shear stress across tne 



