Study on stress-wave propagation and residual stress distribution of Ti-17 titanium alloy by laser shock peening

Abstract

Laser shock peening has advantages of less restriction, better reinforcement, stronger controllability, and so on, which could greatly improve the fatigue properties of the material compared with traditional processes. In this paper, dual phase titanium alloy Ti-17 has been studied, and numerical simulation has been taken to analyze the stress-wave propagation rules in Ti-17 titanium alloy plates with different thicknesses. In addition, the distribution of residual stress which is obtained by experiments is used to verify the accuracy of the above rules. Furthermore, the variation rules of fatigue characteristics of plates with different thicknesses under the same laser shock peening parameters are analyzed. The results show that due to the reflection of the stress-wave, the final residual stress and fracture toughness of the specimen decrease, resulting in an increase of the crack propagation rate and crack length. Since thinner specimens have a higher frequency of stress-wave reflection, they show greater effects.

Fabrication of ordered honeycomb porous poly(vinyl chloride) thin film doped with a Schiff base and nickel(II) chloride

“…It has been reported that the structure of the honeycomb is highly dependent on various factors such as solvent type, polymer side-chain length and the polymer concentration [49] . The SEM topography has been used as a powerful tool to detect both the size and shape of particles [ 50 , 51 , 52 , 53 ].…”