Statics solution algorithm was adopted in elastic-plastic finite element analysis program to simulate the extrusion strengthening process.Influences of parameters

such as friction coefficient

extrusion times

extrusion amount

restriction way

fillet radius and matching mode

on the residual stress distribution were analyzed.According to specific configuration of the pressure equalizing hole of the engine compressor disc

three different kinds of extrusion heads were designed

including:one-sided extrusion head

cylindrical extrusion head and T-shaped extrusion head.Two kinds of materials (stainless steel 1Cr11Ni2W2MoV and high temperature nickel-alloy ЗП742) were used to design and manufacture the simulation samples of sheets with holes.Edges of holes were strengthened using two above-mentioned coldworking techniques.The experiment results show that T-shaped extrusion techniques can efficiently and conveniently improve fatigue strength of sheets with holes.Numerical simulations were compared with experimental results

showing that statics general program can be used to simulate extrusion progress of sheet metal specimens with holes

and provide a guidance to extrusion strengthening research.