Ti-6Al-2Zr-1Mo-1V板材热成形的韧性破裂准则
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摘要
为精确预测Ti-6Al-2Zr-1Mo-1V板材热成形过程中的破裂现象,通过实验与有限元模拟相结合的方法建立基于C&L,R&T和Oyane的钛合金板材热成形韧性破裂准则。首先,进行不同温度及应变速率下的钛合金板材单轴等温拉伸实验,得到不同温度及应变速率下的破裂应变。随后,基于得到的破裂应变,利用有限元模拟及点追踪方法得到上述不同韧性破裂准则的损伤参数,通过引入Zener-Holloman参数lnZ,建立损伤参数随温度和应变速率变化的模型。最后,综合考虑变形历史、温度及应变速率对板材破裂的影响,建立基于C&L,R&T和Oyane准则的钛合金板材热成形韧性破裂准则,并将建立的韧性破裂准则应用到钛合金锥形件热旋成形破裂预测。研究结果表明:破裂应变随温度的升高和应变速率的降低而逐渐增大;不同韧性破裂准则的损伤参数随温度和应变速率的变化与破裂应变的相同;Oyane准则预测准确度最高。
To accurately predict the fracture during the hot forming process of Ti-6Al-2Zr-1Mo-1V alloy sheets, ductile fracture criterions(DFCs) for the hot forming process of titanium alloy sheets was proposed based on C&L, R&T and Oyane criterions by the combination method of experiments with finite element(FE) simulation. Firstly, uniaxial isothermal tension tests were conducted at different temperatures under various strain rates and the fracture strains were obtained. Then, with the fracture strains, the damage parameters of different DFCs were obtained by FE method and point trace method. By introducing the Zener-Holloman parameter lnZ, the damage parameter model considering the effects of temperature and strain rate was established. Finally, the DFCs for hot forming process of titanium alloy sheets based on C&L, R&T and Oyane criterions were established by considering the deformation history, temperature and strain rate. The established criteria was applied in the hot shear spinning process of titanium alloy. The results show that fracture strains increase with the increase of temperature and decrease of strain rate; the changes of damage parameters of different DFCs are the same as that of fracture strains; Oyane criterion is the most accurate in predicting the fracture occurrence.
To accurately predict the fracture during the hot forming process of Ti-6Al-2Zr-1Mo-1V alloy sheets, ductile fracture criterions(DFCs) for the hot forming process of titanium alloy sheets was proposed based on C&L, R&T and Oyane criterions by the combination method of experiments with finite element(FE) simulation. Firstly, uniaxial isothermal tension tests were conducted at different temperatures under various strain rates and the fracture strains were obtained. Then, with the fracture strains, the damage parameters of different DFCs were obtained by FE method and point trace method. By introducing the Zener-Holloman parameter lnZ, the damage parameter model considering the effects of temperature and strain rate was established. Finally, the DFCs for hot forming process of titanium alloy sheets based on C&L, R&T and Oyane criterions were established by considering the deformation history, temperature and strain rate. The established criteria was applied in the hot shear spinning process of titanium alloy. The results show that fracture strains increase with the increase of temperature and decrease of strain rate; the changes of damage parameters of different DFCs are the same as that of fracture strains; Oyane criterion is the most accurate in predicting the fracture occurrence.
引文
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[17]LI Heng,FU Mingwang,LU Jian,et al.Ductile fracture:Experiments and computations[J].International Journal of Plasticity,2011,27(2):147-180.
[2]FAN Xiaoguang,YANG He.Internal state variable based self consistent constitutive modeling for hot working of two-phase titanium alloys coupling microstructure evolution[J].International Journal of Plasticity,2011,27(11):1833-1852.
[3]KHAN A S,KAZMI R,FARROKH B.Multiaxial and non-proportional loading responses,anisotropy and modeling of Ti-6Al-4V titanium alloy over wide ranges of strain rates and temperatures[J].International Journal of Plasticity,2007,23(6):931-950.
[4]YANG Lei,WANG Baoyu,LIU Gang,et al Behavior and modeling of flow softening and ductile damage evolution in hot forming of TA15 alloy sheets[J].Materials&Design,2015,85(15):135-148.
[5]MA Hao,XU Wenchen,JIN Bocheng,et al.Damage evaluation in tube spinnability test with ductile fracture criteria[J].International Journal of Mechanical Sciences,2015,100:99-111.
[6]郭玉琴,王帅,朱新峰,等.B340/590DP钢温热成形破裂准则提出及成形极限预测[J].塑性工程学报,2015,22(3):38-43.GUO Yuqin,WANG Shuai,ZHU Xinfeng,et al.Proposal of warm forming fracture criterion and forming limit prediction of B340/590 DP steel[J].Journal of Plasticity Engineering,2015,22(3):38-43
[7]LIN Yongcheng,LIU Yanxing,LIU Ge,et al.Prediction of ductile fracture behaviors for 42Cr Mo steel at elevated temperatures[J].Journal of Materials Engineering and Performance,2015,24(1):221-228.
[8]OYANE M,SATO T,OKIMOTO K,et al.Criteria for ductile fracture and their applications[J].Journal of Mechanical Working Technology,1980,4(1):65-81.
[9]谢延敏,于沪平,陈军,等.板料成形中韧性断裂准则应用研究进展[J].工程设计学报,2007,14(1):6-10.XIE Yanmin,YU Huping,CHEN Jun,et al.Recent advances of research on application of ductile fracture criteria in sheet metal forming process[J].Chinese Journal of Engineering Design,2007,14(1):6-10.
[10]陈志英,董湘怀.基于GTN细观损伤模型的板料成形过程损伤分析[J].工程力学,2009,26(7):238-244.CHEN Zhiying,DONG Xianghuai.Ductile damage analysis for fracture in sheet metal forming based on GTN mesoscopic damage model[J].Engineering Mechanics,2009,26(7):238-244.
[11]ZHAN Mei,GU Chuangguo,JIANG Zhiqiang,et al.Application of ductile fracture criteria in spin-forming and tube-bending processes[J].Computational Materials Science,2009,47(2):353-365.
[12]YAN Yu,WANG Haibo,WAN Min.Prediction of fracture in press bend forming of aluminum alloy high-stiffener integral panels[J].Computational Materials Science,2011,50(7):2232-2244.
[13]KIM W J,KIM H K,KIM W Y,et al.Temperature and strain rate effect incorporated failure criteria for sheet forming of magnesium alloys[J].Materials Science and Engineering A,2008,488(1/2):468-474.
[14]张士宏,宋鸿武,徐勇,等.一种韧性断裂损伤力学建模方法及其应用[J].精密成形工程,2012,3(6):27-32.ZHANG Shihong,SONG Hongwu,XU Yong,et al.A new modeling approach of ductile damage mechanics and its applications[J].Journal of Netshape Forming Engineering,2012,3(6):27-32.
[15]LOU Y,HUH H,LIM S,et al.New ductile fracture criterion for prediction of fracture forming limit diagrams of sheet metals[J].International Journal of Solids and Structures,2012,49(25):3605-3615.
[16]古田.高强钢热成形韧性断裂准则研究[D].哈尔滨:哈尔滨工业大学机电工程学院,2012:2-5.GU Tian.Research on ductile fracture criterion of hot stamping[D].Harbin:Harbin Institute of Technology.School of Mechatronics Engineering,2012:2-5.
[17]LI Heng,FU Mingwang,LU Jian,et al.Ductile fracture:Experiments and computations[J].International Journal of Plasticity,2011,27(2):147-180.