基于正交切削逆识别井下管柱的Johnson-Cook本构模型OA北大核心CSTPCD
Reverse identification based on orthogonal cutting for Johnson-Cook constitutive model of downhole string
在有限元仿真金属切削过程中,本构模型是仿真的基础,目前井下生产管柱J55油管材料的本构模型参数尚不明确,为此,提出一种基于正交切削理论逆识别油管材料Johnson-Cook(J-C)本构模型参数的方法.首先,通过准静态拉伸试验得到油管材料的应力-应变曲线,根据曲线拟合确定J55油管的初始屈服强度A、应变硬化系数B和应变硬化因子n;其次,通过正交切削试验获得切削力以及进给力,根据正交切削试验和平行剪切区模型,计算正交切削过程主剪切区中的流动应力、应变、应变率以及切削温度,并将这些参数与计算出的A、B、n代入J-C模型中,得到多组应变率敏感性参数C以及热软化效应参数m,从而确定其约束范围;第三,采用自适应权重粒子群算法在约束范围中搜索出参数C和m的最优值,进而确定J55油管材料本构模型参数;最后,使用逆识别法得出的J-C本构模型进行有限元仿真,将仿真结果与试验结果进行了对比.研究结果表明:与试验相比,有限元仿真的切削力和进给力最大相对误差分别为14.4%和13.64%,有限元仿真模拟温度与实际测量温度的最大相对误差为10.57%,仿真模型和实际切削过程在切屑形态上表现出了一致规律,验证了逆识别方法可行性和本构模型的可靠性.
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.
祝效华;周博文;敬俊;叶文勇;田洋;倪宗清
西南石油大学机电工程学院,四川成都,610500中国石油集团川庆钻探工程有限公司钻采工程技术研究院,陕西西安,710018||低渗透油气田勘探开发国家工程实验室,陕西西安,710018
金属材料
J55油管本构模型逆向识别正交切削有限元仿真
J55 tubingconstitutive modelreverse identificationorthogonal cuttingfinite element simulation
《中南大学学报（自然科学版）》 2024 (003)
939-950 / 12
国家自然科学基金资助项目(52034006,52004230);四川省自然科学基金资助项目(23NSFSC2101)(Projects(52034006,52004230)supported by the National Natural Science Foundation of China;Project(23NSFSC2101)supported by the Natural Science Foundation of Sichuan Province)
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