Mechanical properties and constitutive model of AMPCO? 18 copper alloy under high speed impact load
In order to study the mechanical properties and deformation behavior of AMPCO®18 copper alloy under high speed impact load, high-speed impact experiments with strain rates of 3409, 3564 ,4285 s-1 have been carried out using Hopkinson compression rod technique. The results show that with the increase of impact load and strain rate, dynamic recrystallization occurs, the grain is significantly refined, and the strength of the alloy increases accordingly. At the strain rate of 4285 s-1 , no shear bands are found in the structure, indicating that the alloy has strong impact resistance. The predicted values of the Johnson-Cook model of AMPCO®18 copper alloy are in good agreement with the experimental values, and the correlation coefficient R is 0.94346, indicating that the model can well predict the rheological behavior of AMPCO®18 copper alloy during high-speed impact.
copper alloyhigh speed impactgrain refinementimpact resistanceconstitutive model
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