TABLE OF CONTENTS 



Page 



ABSTRACT 1 



INTRODUCTION 2 



DESIGN AND DESCRIPTION OF MODELS 2 



MODEL OV-1 3 



MODELS OV-3 AND OV-4 7 



MODEL OV-2 10 



MODEL OV- 5 13 



INSTRUMENTATION AND TEST PROCEDURE 15 



TEST RESULTS AND DISCUSSION 17 



MODELS OV-1 AND OV-2 17 



MODELS OV-3, OV-4, AND OV-5 21 



INTERPRETATION OF RESULTS 25 



AXISYMMETRIC MODE OF COLLAPSE 25 



GENERAL-INSTABILITY MODE OF COLLAPSE 28 



CONCLUSIONS 33 



ACKNOWLEDGMENTS 34 



REFERENCES 35 



