TABLE OF CONTENTS 
ABSTRACT COCCHOLHOHSGHHSSCHSCHSHSFEGHF2OHGSCHBHSHOSCHHLHFTLCHOFOCHOSCHLHOHFGHOHFFTFLCHOSSHHHFAHLCHH SEO 
INTRODUCTION ccoccccccccccccccccccccccccccce sere eves ec cnee cose sseceee 
DESCRIPTION OF MODELS = wcccccccccccccvvcccccccccccscecccsccccccccccees 
TEST PROCEDURE AND RESULTS) .occcccccccvecccccccccccecccveseccccsccees 
DISCUSSION (OF RESULTS), \5'55/5's\sieieiels ole ole e'e1s' e's oleic e\eleic oa c\0\s ow 0) ciceisieleleie eleieie 
CONCLUSIONS ccccccccvcesccccccccnccsccccc cece ccc ceeesseccesesescece 
ACKNOWLEDGMENTS = -cocccccecccsceccccvc ose cov vesevccc ec esesecoeeecesees 
REFERENCES =o ccocccccccccccc ccc c ccs coc ec seer cere eer eee eesen cols nses 
LIST OF FIGURES 
Figure 1 - Typical Compressive Stress-Strain Curves for Material (STS- 
Steel ) Used in Machined Steel ModelS ccoscccoeccccccvceccvcece 
Figure 2 - Representative Material CharacteriSticS .cccccccccccccccce 
Figure 3 - Details of the Cylinder-Spherical Boundary Intersections of 
the Models CHOOCHOHRGOHHSHOHLCHOHLHOHGH®HSLEHSHHSHHSHCHOHRHSCHOBSFHFOSLECHSCOH 
Figure 4 ent Collapsed Models aESio) Shale Siarclc Gia ietcve cuolata ace Siete ielorera Clete olazacain wince 
Figure 5 - Pressure versus Measured Change in Internal Volume for 
Model 7A eoe7 OOF Cee S2HSGH2H2SSFTHHOFFLCHFHFFCHHBLCHHR HO CHF HESHOFTHH8 O80 
Figure 6 - Nondimensional Plot of Experimental Results for Machined 
Near-Perfect STS Hemispherical ShellS  cescoccccceccccccence 
LIST OF TABLES 
Table ub a Model Dimensions CHOHSTHSCHSHOLCHOHHHOHOFSHFGOHHLGHOHHGOHHHSCT7HSSFCHXOCHKHSE 
Table 2 - Measured Wall Thicknesses and Initial Departures from 
Sphericity @coeaeeenvno@e@eeeoeeceaooeaeeeseoevoeseoevoeevneee2eeaeeee7e2 2082020802080 0808080 
Table 3 - Pressures at Which Strains were Recorded ceccccccccccccccce 
Table 4 
Table 5 - Comparison of Experimental Collapse Pressures with 
Theory for Near-Perfect Thin Spherical ShellS .cccccceccccce 
Measured Strain Sensitivity CoefficientS cecccccccccccccnce 
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