A Photoplastic Study of Residual Stress in an Overloaded Breech Ring.
ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND WATERVLIET NY BENET WEAPONS LAB
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A two-dimensional model of the meridian section of a breech ring was made of a photoplastic material which had been calibrated optically and mechanically. The maximum fillet stress was determined for an elastic load as well as an elastoplastic load. Residual stress resulting from complete unloading was calculated by subtractive superposition of elastic and plastic solutions. An elastic process is assumed during unloading. Transition from model to prototype was discussed. Author