52 



139 



0.1 



0.2 



0.3 



0.4 



0.5 



Proportionate Deflection 



0.6 



Figure 4U - Energy-Deflection Curves 



The curves plotted are averages of the data obtained on the plates tested. 



This graph may be used to predict the variation of absorbed energy with 

 deflection for any thin circular plate of any of the five materials. 



the energy curves with areas under the tensile curves of Figure 37, which are 

 also proportional to energy absorption with deformation. The correspondence 

 is about as good as that of Figures 37 and U3. it should be noted that the 

 ordlnates of Figure 44 do not represent directly total energy absorption. To 

 obtain a quantity proportional to total energy absorption the plotted values 

 must be multiplied by a^. If this be done, it will be seen that furniture 

 steel absorbs less energy than special treatment steel but more than medium 

 steel before rupture. The greater ductility of the furniture steel and the 

 fact that energy absorption varies approximately as the square of the deflec- 

 tion are the underlying reasons. 



