The work presentedin this paper was sup-portedb y the U.S. Army ResearchO ffice under Contract DAAG-29-81-K-0123;
Dr. George Mayer;
TechnicalM onitor. The authora cknowl-edges MrH. . Rudnickif or his key contributioinn developintgh eh igh-speepdh otographtye chnique. Mr. J. Hunt was instrumentainl producingt he grid lines on the torsion specimensE. ncourage-mentsa nd manyh elpfuld iscussionws ith Prof. T. Kobayashi;
Nagoya Institute of Technology;
Japan;
Dr;
M;
Stelly;
C EA;
France;
a nd Drs. D.A. ShockeyD;
R;
Curran;
a nd L. SeamanS;
RI International;
U SA are also greatlya ppreciated;