在210℃、不同载荷下对硬铝合金2A12板状试样进行了单轴拉伸蠕变实验,得到了硬铝的蠕变损伤参数以及断裂时的部位和损伤度.在此基础上建立了硬铝合金2A12板蠕变试样的有限元模型,基于简化的K-R损伤模型,分析了在210℃、恒载荷条件下的试样应变、损伤等随时间的变化规律以及试样蠕变损伤与位置的关系.结果表明,数值模拟与试验结果基本一致,试样中心蠕变曲线都具有稳态阶段和损伤扩展阶段,与单轴试验的应变曲线十分相似.整个试样在离中心大约9～10mm处损伤比较严重,呈现明显局部化特征.
参考文献
| [1] | KACHANOV L M.On Creep Rupture Time[M].Izv Acad Nauk SSSR,Otd Tech Nauk,1958 |
| [2] | KACHANOV L M.Introduction to Continuum Damage Me chanics[M].Martinus Nijhoff Publishers.Dordrecht.The Netherla,1986 |
| [3] | KACHANOV L M.The Theory of Creep[M].British Library BostonSp Wetnerley,1960 |
| [4] | RABOTNOV Y N.Creep Problems in Structural Members[M].Amsterdam:North-Holland Publishing Company,1969 |
| [5] | LEMAITRE J A.Course on Damage Mechanics[M].Berlin:Springer-Verlag,1992 |
| [6] | LECKIE F A;HAYHURST D R .Constitutive equations for creep rupture[J].Acta Metallurgica,1977,25:1059-1070. |
| [7] | HAYHt)RST D R .Creep rupture under multi-axial states of stress[J].Journal of the Mechanics and Physics of Solids,1972,20:381,390. |
| [8] | KOWALEWSKI Z L;HAYHURST D R;DYSON B F .Mechanisms-based creep constitutive equations for an alu minium alloy[J].Journal of Strain Analysis,1994,29:309,16. |
| [9] | HAYHURST D R;DIMMER P R;MORRISON C J .Development of continuum damage in the creep rupture of notched bars[J].Philosophical Transactions of the Royal Society of London,1984,A311:103-129. |
| [10] | KOWALEWSKI Z L;HAYHURST D R;DYSON B F .Mechanisms-based creep constitutive equations for an alu minum ahoy[J].Journal of Strain Analysis,1994,29:309,316. |
| [11] | DUNNE FPE;OTHMAN A M;HALL F R et al.Repre sentation of uniaxial creep curves using continuum damage mechanics[J].International Journal of Mechanical Sciences,1990,32:945,957. |
| [12] | Z.F. Yue;Z.Z. Lu;X.M. Wang .A numerical study of damage development and creep life in circular notched specimens during creep[J].Materials at High Temperatures,2002(3):147-152. |
| [13] | 金属力学及工艺性能试验方法标准[M].北京:中国标准出版社,1996 |
| [14] | 武恭;姚良均;李震夏.铝与铝合金材料手册[M].北京:科学出版社,1994 |
| [15] | 李兆霞.损伤力学[M].北京:科学出版社,2002 |
| [16] | 余天庆;钱济成.损伤理论及其应用[M].北京:国防工业出版社,1993 |
| [17] | 余寿文;冯西桥.损伤力学[M].北京:清华大学出版社,1997 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%