Simulation of heating and residual stresses in a steel shot peened titanium alloy


Аuthors

Pozhidaev A. A., Strokach E. A.*

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: evgenij.strokatsch@mai.ru

Abstract

Features and details of modern technological processes, including surface plastic deformation, are widely studied numerically, though often some physical effects, for example plastic work heating, or preliminary mesh studies are not included. In this paper, explicit finite element analysis method is used to simulate a shot peening process of Ti6Al4V using AISI 52100 shots aiming to determine the effect of heating on residual stresses. Elastoplastic Johnson – Cook models are used both with the Gruneisen equation of state. A single shot with a diameter of 0,3 mm normally impacts a fixed titanium alloy sample at 10 m/s – 40 m/s. Preliminary mesh convergence and particle number convergence studies have shown that 12 shots are needed and the mesh size in the contact area should be at least 0,005 mm (1,7% of particle diameter), and the peened layer depth is similar for all cases being about 0,17 mm. The temperature rise in the contact area is 15 ⁰С, which insignificantly affects the residual stresses, that have a maximum of 770 MPa at depth of 0,024 mm.

Keywords:

simulation of residual stresses, shot peening, Johnson – Cook model, mesh independence study, plastic deformation heating

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