Reverse identification based on orthogonal cutting for Johnson-Cook constitutive model of downhole string
In the finite element simulation of metal cutting process,the constitutive model forms the foundation of the simulation.At present,the constitutive model parameters of the J55 tubing for downhole production are not clear.To address this,a method based on the orthogonal cutting theory was proposed for the reverse identification of Johnson-Cook(J-C)constitutive model parameters for tubing.Firstly,the stress-strain curve of the tubing was obtained by quasi-static tensile test,and the initial yield strength A,strain hardening coefficient B and strain hardening factor n of the J55 tubing were determined through curve fitting.Secondly,the cutting force and feed force were obtained through orthogonal cutting experiments.Based on the parallel shear zone model,the flow stress,strain,strain rate and cutting temperature in the shear zone of the orthogonal cutting process were calculated by the orthogonal cutting test data.By substituting these parameters with the calculated A,B,and n into the J-C model,a set of strain rate sensitivity parameter C and the thermal softening effect parameter m were calculated to determine their constraint range.Thirdly,the adaptive weight particle swarm optimization algorithm was used to search for the optimal values of parameters C and m within the constraint range,and the constitutive model parameters of J55 tubing were determined.Finally,the J-C constitutive model obtained through reverse identification was employed for finite element simulation,and the simulation results were compared with the experimental data.The results show that the maximum relative errors between the finite element simulation and experimental values are 14.4%for cutting force and 13.64%for feed force.Additionally,the maximum relative error between the simulated and measured temperatures is 10.57%.The simulated model and the actual cutting process exhibit a congruent pattern in the morphology of the chip,thereby confirming the viability of the reverse identification method and the reliability of the constitutive model.
J55 tubingconstitutive modelreverse identificationorthogonal cuttingfinite element simulation
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