The Academic Research of Continuum Water Jet Core Section Critical Shot Peening Pressure

摘要

Continuum water jet critical shot peening pressure is the min pressure of the shotted materials when its surface layer produces plastic deformation. When the shot peening pressure is bigger than the critical value, materials surface layer will produce plastic deformation, and it will forms a surface strengthening layer of certain thickness. So it's very important to test critical shot peening pressure when it comes to control shot peening strength effectively. The article takes the nozzle whose outlet is taper constringency with column section as a example, according to the velocity of jet, impact radius effected on target surface by jet and dynamic water pressure effected on target surface by element flow in jet, establishing the dynamic water pressure distributing model effected on target surface by continuum water jet works at core section shot peening. According to the resolution of Boussinwsq, the analysis shows the changed rule that stress effected on target symmetry axis by load as non-dimension depth and non-dimension radius. According to the Mises yield rule, the article raises the calculating method of critical shot peening pressure. Take 45 steel as example, when the inlet total pressure of nozzle is bigger than 39 MPa, the impact effect of water jet to the target surface will make target body produce plastic deformation.