精密成形工程
精密成形工程
정밀성형공정
Journal of Netshape Forming Engineering
2015年
6期
65-69
,共5页
1Cr18Ni9Ti管%滞后回弹%双耗散黏弹塑性模型%有限元模拟
1Cr18Ni9Ti管%滯後迴彈%雙耗散黏彈塑性模型%有限元模擬
1Cr18Ni9Ti관%체후회탄%쌍모산점탄소성모형%유한원모의
1Cr18Ni9Ti tube%time-dependent springback%two-layer viscoplasticity model%finite-element simulation
目的 研究1 Cr18 Ni9 Ti不锈钢管在单轴拉伸和回转牵引弯曲卸载后的滞后回弹现象,利用有限元软件进行滞后回弹结果的预测. 方法 通过系列单轴拉伸和应力松弛试验得到1 Cr18 Ni9 Ti不锈钢管黏弹塑性材料参数,采用双耗散黏弹塑性材料模型在有限元ABAQUS软件进行拉伸和回转弯曲卸载后滞后回弹的模拟预测,并与试验结果对比. 结果 利用该黏弹塑性材料模型预测得到的滞后回弹变化趋势与试验值吻合较好,数值上接近试验值. 结论 基于双耗散黏弹塑性材料模型进行滞后回弹的建模,在瞬时回弹后,弹塑性组合单元和黏弹性组合单元中存在相反的残余应力,从而驱动材料持续发生黏弹性变形,可能是产生滞后回弹的原因. 有限元分析中考虑了加载过程中的黏性响应,其预测结果更加接近实际.
目的 研究1 Cr18 Ni9 Ti不鏽鋼管在單軸拉伸和迴轉牽引彎麯卸載後的滯後迴彈現象,利用有限元軟件進行滯後迴彈結果的預測. 方法 通過繫列單軸拉伸和應力鬆弛試驗得到1 Cr18 Ni9 Ti不鏽鋼管黏彈塑性材料參數,採用雙耗散黏彈塑性材料模型在有限元ABAQUS軟件進行拉伸和迴轉彎麯卸載後滯後迴彈的模擬預測,併與試驗結果對比. 結果 利用該黏彈塑性材料模型預測得到的滯後迴彈變化趨勢與試驗值吻閤較好,數值上接近試驗值. 結論 基于雙耗散黏彈塑性材料模型進行滯後迴彈的建模,在瞬時迴彈後,彈塑性組閤單元和黏彈性組閤單元中存在相反的殘餘應力,從而驅動材料持續髮生黏彈性變形,可能是產生滯後迴彈的原因. 有限元分析中攷慮瞭加載過程中的黏性響應,其預測結果更加接近實際.
목적 연구1 Cr18 Ni9 Ti불수강관재단축랍신화회전견인만곡사재후적체후회탄현상,이용유한원연건진행체후회탄결과적예측. 방법 통과계렬단축랍신화응력송이시험득도1 Cr18 Ni9 Ti불수강관점탄소성재료삼수,채용쌍모산점탄소성재료모형재유한원ABAQUS연건진행랍신화회전만곡사재후체후회탄적모의예측,병여시험결과대비. 결과 이용해점탄소성재료모형예측득도적체후회탄변화추세여시험치문합교호,수치상접근시험치. 결론 기우쌍모산점탄소성재료모형진행체후회탄적건모,재순시회탄후,탄소성조합단원화점탄성조합단원중존재상반적잔여응력,종이구동재료지속발생점탄성변형,가능시산생체후회탄적원인. 유한원분석중고필료가재과정중적점성향응,기예측결과경가접근실제.
To investigate the time-dependent springbackof 1Cr18Ni9Ti stainless steel tubes under tension and rotary bending, and to predict it by FEM. The two-layer viscoplasticity model whichis available in the finite-element analysis soft-ware ABAQUS is applied. Parameters of this model are obtained based on the results of a series of uniaxial tension and stress relaxation tests carried out at different strain rates. The time-dependent springbackquantitiesof tubes are simulated by ABAQUS based on thiselasto-viscoplasticity model. It′s revealed that simulated time-dependentspringbacklaw and quantities are close to the experimental data. Basedon thiselasto-viscoplasticity material model, it seems that the reverse residual stress appeared in the elastic-plastic network and visco-elastic network caused the time-dependent springback. Thenumericalre-sults are in good agreement with experimental results with this model by taking account of the viscous behaviors in the form-ing process.
