Numerical simulation of ultrasonic rolling pressure needs to be enriched and further developed.The temperature-strain rate dependent Johnson-Cook constitutive model was used to describe the plastic deformation behavior of nano-sized TiB2/7075 aluminum matrix composites,and the relevant constitutive parameters were calibrated by Gleeble thermal compression simulation test combined with least square fitting.Using finite element software ABAQUS,3D full hexahedron gradient mesh model was constructed.The ultrasonic rolling strengthening process of composite materials was numerically simulated by six steps.The results show that there is a significant difference between the simulation results and the measured results in terms of residual stress distribution,but the failure mode of the mesh reflects the cracking and delamination of the surface material well.From the simulation point of view,it is confirmed that the excessive plastic deformation in the reciprocating ultrasonic rolling process causes the surface damage of the composite.The results have important guiding significance for the exploration of ultrasonic rolling of metal matrix composites and the development of related numerical simulation research.
nano TiB2/7075 aluminum matrix compositesultrasonic rollingfinite element simulationresidual stresssurface morphology
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