Studies of artificial cracks at simulated rocket motor liners by the frozen stress method

摘要

Two types of bimaterial speciments, one consisting of two photoelastic materials with different critical temperatures (Type A) and one consisting of a photoelastic material with and without alouminum powder (the powder added to alter the modulus of elasticity without changing the critical temperature (Typy B) are ocnstructed by bonding two hyaves of the dissimilar materials together. Each type of specimen contains an artificial edge crack along the bond line and loaded normal to the bond line. After evaluating the two specimen types by measuring the variation of the Mode I stress intensity distribution through the specimen thickness, Type B was selected as a superior model and its features studied in detail.