640 



HPPARD AND CHITTY ON EXPERIMENTS ON THE 



cylinder No. 11 was only 0-07 inch as comjiared with 0'30 inch in cylinder 

 No. 3 under the same load. 



In Test No. 11 B a considerably higher load was readied than in 



Fig. 39. 



CoNTOUES OP Dent in 

 Cylinder No. 11 afteb 

 Test A. 



RAM DISPLACEMENT . INCHES 



Load-Displacement CnavES fob Ctundbr No. 11. 



the first with a correspondingly deeper dent (2-1 inches), but the main 

 characteristics were the same. 



Energy Absorption in Plastic Deformation. 



The energy absorbed in making the dent is measured by the area under 

 the load-displacement curve and practically the whole of it is used in 

 producing plastic deformation. The load-displacement curves for the 

 static tests on the small cylinders were integrated to obtain the curves of 

 Fig. 42, which show energy plotted against depth of dent ; the smoothness 

 of the curves indicates a general consistency in the relationship. 



