Dynamic Stress Concentration Analysis in High Velocity Tension of Strips with Notches or Hole by Means of High Speed Photoelasticity
The relations of dynamic stress concentration factor fd varying with time vs static stress concentration factor fs of very long strips with notches under dynamic tension are analyzed by high speed photoelasticity by means of a multiple spark gap camera using hard epoxy resin specimens and by numerical analysis using FEM and Newmark’s β method. As the shapes of the notches, central circular hole and U-shaped notches at both sides are chosen. The phenomenon of maximum stress position deviation towards incident side at the passage of stress wave front and the behaviour that fd increases with time and then tends to fs for all notches, are found. The results of corresponding FEM analyses well support the above mentioned behaviours obtained photoelastically.
KeywordsStress Wave Stress Concentration Factor Stress Plateau Dynamic Tension Dynamic Stress Concentration
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