138 



51 



0.2 0.3 0.4 



~ Proport lonote Deflection 



0.5 



0.6 



Figure 43 - Pressure-Deflection Curves 



These cxirves are averages of the curves shown in Figures 38 to l^. This graph may be used to predict 

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



the curve for furniture steel assumes excessively high values as a result of 

 the data for the plates of diameter 2.56 Inches of Figure 39- 



A more refined analysis than the membrane analysis considered ear- 

 lier in this report v.'ould attempt to correct for variations In stress-strain 

 characteristics by estimating the strains at various values of 2/0 and using 

 the corresponding stresses in place of cr„ for evaluating the proportionate 

 pressure. 



The energy-deflection curves of Figure UU exhibit deviations of 

 somewhat lower magnitudes than do the pressures. Comparison may be made of 



