A METHOD FOR DETERMINING DYNAMIC FRINGE VALUE (f_σ)d OF PHOTOELASTIC MATERIALS LOADED EXPLOSIVELY

Ⅰ. INTRODUCTION The dynamic fringe value （fσ）d of photoelastic materials is one of the important parameters to quantitative calculation in dynamic photoelasticity. Clark, Clark and Sanford, and Pih investigated （fσ）d of photoelastic materials impacted with a projectile or a falling hammer (the effective loading time is more than 10-4 s)