对设计的拉伸剪切试样和原位拉伸剪切试样分别进行不同剪应变率下的拉伸剪切试验及原位拉伸剪切试验,研究6061铝合金在剪力状态下的力学性能及断裂行为,并用有限元软件ABAQUS对铝合金在剪应力状态下的断裂行为进行模拟.结果表明:随着剪应变率的增大,6061铝合金的剪切屈服强度和抗剪强度基本保持不变,但剪切断裂应变明显减小；剪应变率对试样的断口形貌没有影响；6061铝合金晶界是其最薄弱环节,在拉伸剪切过程中铝合金试样表面上产生了大量与拉伸方向平行的滑移带；微裂纹在剪应力作用下形核于与拉伸方向平行的滑移带和晶界,随着剪应力的增加,微裂纹长大和扩展；微裂纹之间通过剪切而连接导致试样断裂；6061铝合金剪切断裂行为可以用Johnson-Cook模型进行描述.
参考文献
| [1] | Anthony K. Pickett;Thomas Pyttel;Fabrice Payen;Franck Lauro;Nikica Petrinic;Heinz Werner;Jens Christlein .Failure prediction for advanced crashworthiness of transportation vehicles[J].International journal of impact engineering,2004(7):853-872. |
| [2] | Shujuan Hou;Qing Li;Shuyao Long;Xujing Yang;Wei Li .Multiobjective optimization of multi-cell sections for the crashworthiness design[J].International journal of impact engineering,2008(11):1355-1367. |
| [3] | JOEM K P;JUNG K S .A method for progressive structural crashworthiness analysis under collisions and grounding[J].Thin-Walled Structures,2007,45:15-23. |
| [4] | Batra RC;Lear MH .Adiabatic shear banding in plane strain tensile deformations of 11 thermoelastoviscoplastic materials with finite thermal wave speed[J].International Journal of Plasticity,2005(8):1521-1545. |
| [5] | Warren TL.;Forrestal MJ. .Effects of strain hardening and strain-rate sensitivity on the penetration of aluminum targets with spherical-nosed rods[J].International Journal of Solids and Structures,1998(28/29):3737-3753. |
| [6] | ZHU H;ZHU L;CHEN J H;L(U) D .Investigation of fracture mechanism of 6063 Al alloy under different stress states[J].International Journal of Fracture,2007,146(03):159-172. |
| [7] | 朱浩,朱亮,陈剑虹,吕先锋.不同应力状态下铝合金变形及损伤机理的研究[J].稀有金属材料与工程,2007(04):597-601. |
| [8] | Gongyao Gu;Yong Xia;Qing Zhou.On the fracture possibility of thin-walled tubes under axial crushing[J].Thin-Walled structures,2012:85-95. |
| [9] | Yang RQ;Li SX;Zhang ZF .Cyclic deformation and dynamic compressive properties of copper bicrystals[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1-2):207-217. |
| [10] | E. Fleury;J. S. Ha .Small punch tests to estimate the mechanical properties of steels for steam power plant: I. Mechanical strength[J].International Journal of Pressure Vessels and Piping,1998(9):699-706. |
| [11] | Finarelli D;Roedig M;Carsughi F .Small punch tests on austenitic and martensitic steels irradiated in a spallation environment with 530 MeV protons[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,2004(2/3):146-150. |
| [12] | 郭伟国,田宏伟.几种典型铝合金应变率敏感性及其塑性流动本构模型[J].中国有色金属学报,2009(01):56-61. |
| [13] | R. Smerd;S. Winkler;C. Salisbury;M. Worswick;D. Lloyd;M. Finn .High strain rate tensile testing of automotive aluminum alloy sheet[J].International journal of impact engineering,2005(1/4):541-560. |
| [14] | Yuan, S.P.;Wang, R.H.;Liu, G.;Li, R.;Park, J.M.;Sun, J.;Chen, K.-H. .Effects of precipitate morphology on the notch sensitivity of ductile fracture in heat-treatable aluminum alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(27/28):7369-7381. |
| [15] | 朱浩,吕丹,朱亮,陈剑虹,陈德利.6061铝合金断裂机理的原位拉伸研究[J].机械工程学报,2009(02):94-99. |
| [16] | A.S. Milani;W. Dabboussi;J.A. Nemes;R.C Abeyaratne .An Improved Multi-objective Identification Of Johnson-cook Material Parameters[J].International journal of impact engineering,2009(2):294-302. |
| [17] | WANG Xue-bin .Temperature distribution in adiabatic shear band for ductile metal based on JOHNSON-COOK and gradient plasticity models[J].Transactions of Nonferrous Metals Society of China,2006(2):333-338. |
| [18] | D. I. Lalwani;N. K. Mehta;P. K. Jain .Extension of Oxley's predictive machining theory for Johnson and Cook flow stress model[J].Journal of Materials Processing Technology,2009(12/13):5305-5312. |
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