Study of premixed water jet critical shot peening pressure

Using momentum theorem and Hertz elasticity contact theory,established the pressure distributing model from impacting on target surface by premixed water jet pill.Using space axis symmetry question resolution of elasticity mechanics,analyzed and showed stress distributing on target symmetry axis effected by load.According to the Mises yield qualification,put forward the formula of critical shot peening velocity.Taking the nozzle whose outlet was taper constringency with column section as a example,used software Fluent and Matlab,analyzed and established the relation formula of pill velocity and shot peening pressure on the axis of outlet of nozzle.Taking 45 steel for target material,calculated the academic critical shot peening pressure value of 45 steel on the condition of given shot peening,made critical shot peening pressure experiment to 45 steel with premixed water jet and residual stress test to specimen surface with X-ray stress instrument.The results indicate that the academic count value of critical shot peening pressure and experiment data inosculate approximatively.