为研究7050T451铝合金蠕变时效本构模型，在160℃、不同应力条件下进行单轴拉伸蠕变试验，分析了蠕变应变、屈服强度和微观组织随时间的变化规律。基于高强铝合金析出强化理论，建立了能描述蠕变时效成形宏观及微观变化的本构方程，并运用遗传算法对材料常数进行拟合优化。研究表明，该模型在不同应力水平下与试验结果吻合良好，能够用来模拟分析蠕变时效成形过程。
To study the creep age constitutive model of 7050T451 aluminum alloy, the uniaxial creep tests were operated under different stress condition at 160℃. The changing tendency of creep strain, yield strength and microstructure with holding time were analyzed. Based on the precipitate hardening theory of high strength aluminum alloy, the constitutive equation which could describe the evolution of macroscopic and microscopic for creep age forming was established. Meanwhile, the material constants were fitted and optimized by using genetic algorithm. According to the result, the present model fits well with the experimental data under different stress levels, which can be used to simulate the process of creep age forming.
参考文献
| [1] | HOLMAN M C .Autoclave age forming large aluminum aircraft panels[J].Journal of Mechanical Working and Technology,1989,20:477-488. |
| [2] | DIEGO J I;PAULO R C;FERNANDO F et al.Creep age forming of AA7475 aluminum panels for aircraft lower wing skin application[J].Materials Research,2012,15(04):596-602. |
| [3] | ZHAN L H;LI Y G;HUANG M H .Effect of process parameters on microstructures of 7055 aluminum alloy in creep age forming[J].Applied Mechanics and Materials,2011,80-81:40-45. |
| [4] | ZHAN L H;TAN S G;HUANG M H .Creep age forming experiment and springback prediction for AA2524[J].Advanced Materials Research,2012,457-458:122-129. |
| [5] | RIBEIRO F C;MARINHO E P;INFORZATO D J et al.Creep age forming:a short review of fundaments and applications[J].Journal of Achievements in Materials and Manufacturing Engineering,2010,43(01):353-361. |
| [6] | ZHAN Lihua;LIN Jiangguo;DEAN T A .A review of the development of creep age forming:experimentation modeling and applications[J].INTERNATIONAL Journal OF MACHINE TOOLS & MANUFACTURE,2011,51(01):1-17. |
| [7] | LIN J;HO K C;DEAN T A .An integrated process for modeling of precipitation hardening and springback in creep age forming[J].INTERNATIONAL Journal OF MACHINE TOOLS & MANUFACTURE,2006,46:1266-1270. |
| [8] | Li, C.;Wan, M.;Wu, X.-D.;Huang, L. .Constitutive equations in creep of 7B04 aluminum alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(16/17):3623-3629. |
| [9] | 李超,万敏,金兴,黄霖.7B04铝合金时效成形本构模型研究与有限元应用[J].塑性工程学报,2010(05):61-65. |
| [10] | ZHAN Lihua;LIN Jianguo;DEAN T A et al.Experimental studies and constitutive modeling of the hardening of aluminum alloy 7055 under creep age forming conditions[J].International Journal of Mechanical Sciences,2011,53(08):595-605. |
| [11] | 李超 .7B04铝合金蠕变时效跨尺度本构模型建立及应用[D].北京:北京航空航天大学,2010. |
| [12] | KOWALEWSKI Z L;HAYHURST D R;DYSON B F .Mechanisms-based creep constitutive equations for an aluminum alloy[J].Journal of Strain Analysis,1994,29(04):309-316. |
| [13] | HUANG L;WAN M;CHIC L et al.FEM analysis of springback in age forming for aluminum alloy plate[J].Chinese Journal of Aeronautics,2007,20(06):564-569. |
| [14] | 吴奭登 .7050铝合金时效强化行为研究[D].哈尔滨工业大学,2006. |
| [15] | S. Esmaeili;D. J. Lloyd;W. J. Poole .A yield strength model for the Al-Mg-Si-Cu alloy AA6111[J].Acta materialia,2003(8):2243-2257. |
| [16] | NIE J F;MUDDLE B C;POLMEAR I J .The effect of precipitate shape and orientation on dispersion strengthening in high strength aluminum alloys[J].J Mater Sci Forum,1996,217:1257-1262. |
| [17] | Lin J;Yang J .GA-based multiple objective optimisation for determining viscoplastic constitutive equations for superplastic alloys[J].International Journal of Plasticity,1999(11):1181-1196. |
| [18] | J. Cao;J. Lin .A study on formulation of objective functions for determining material models[J].International Journal of Mechanical Sciences,2008(2):193-204. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%