为了探求铝合金预拉伸厚板变形特点对应力场的影响,结合实验和有限元仿真,揭示了预拉伸工艺下厚板非均匀区应力演变规律.在不同尺寸厚板和不同工艺下,运用实验预拉伸机仿真模型,分析夹持区和过渡区应力场演变机理和规律.分析结果表明,非均匀区多样化的应力分布特点,不仅影响了厚板夹持稳定性,也对材料拉伸后的锯切率造成影响.拉伸时,夹持长度应不小于2倍试件厚度以保证拉伸稳定性.同时,过渡区范围与板厚度有关,其范围约为板厚的60%～70%,参考锯切长度为板厚3倍为宜.
In order to research the influence of deformation on stress field in an aluminum alloy prestretching thiek plate, the stress evolvement of prestretching plate is presented by experiment and FEA simulation. For the plates with different thickness under different stretching conditions, mechanisms of stress-strain in clam-ping area and transition area are analyzed by FEM of prestretching machine. Results show that the variable and complicated distribution of stress in non-uniform area affects the stabilization of clamp plate and the determina-tion of the area needed to be cut off. The stability of prestretching can be ensured by keeping the clamping dis-tance 2 times more than the thickness. The transition area is related with thickness and it is 60 -70 percent of the plate' s thickness, so the total length of non-uniform area needed to be cut off is approximate to three times of the plate thickness.
参考文献
| [1] | 柯映林,董辉跃.7075铝合金厚板预拉伸模拟分析及其在淬火残余应力消除中的应用[J].中国有色金属学报,2004(04):639-645. |
| [2] | 朱伟,彭大暑,张辉,杨立斌,林高用.7075铝合金厚板淬火残余应力消除工艺的研究[J].铝加工,2002(02):12-14. |
| [3] | 张辉,林高用,杨立斌,彭大暑,林启权,朱伟.高性能铝合金超厚板制备技术及理论[J].材料导报,2002(03):4-6. |
| [4] | 李志辉,熊柏青,张永安,朱宝宏,王锋,刘红伟.7B04铝合金预拉伸厚板的微观组织与性能[J].稀有金属,2007(04):440-445. |
| [5] | M. B. Prime;T. Gnaupel-Herold;J. A. Baumann .Residual stress measurements in a thick, dissimilar aluminum alloy friction stir weld[J].Acta materialia,2006(15):4013-4021. |
| [6] | Muammer Koc;John Culp;Taylan Altan .Prediction of residual stresses in quenched aluminum blocks and their reduction through cold working processes[J].Journal of Materials Processing Technology,2006(1/3):342-354. |
| [7] | 王秋成,柯映林,邢鸿燕.板类构件内部残余应力测试技术研究[J].浙江大学学报（工学版）,2005(03):381-384. |
| [8] | 王树宏,左敦稳,润长生,王珉,徐礼林.LY12,В95п.ч和7050铝合金预拉伸厚板内部残余应力分布特征评估与分析[J].材料工程,2004(10):32-35. |
| [9] | 陆海庆,张思平.7050-T7651铝合金预拉伸厚板生产工艺研究[J].铝加工,2004(04):48-51,54. |
| [10] | Michael B. Prime;Michael R. Hill .Residual stress, stress relief, and inhomogeneity in aluminum plate[J].Scripta materialia,2002(1):77-82. |
| [11] | 王秋成,柯映林.航空高强度铝合金残余应力的抑制与消除[J].航空材料学报,2002(03):59-62. |
| [12] | 赵丽丽,张以都.预拉伸板轧制-拉伸残余应力的计算机仿真[J].北京航空航天大学学报,2004(07):606-609. |
| [13] | 辜蕾钢 .铝合金厚板预拉伸及淬透性研究[D].重庆大学,2004. |
| [14] | 许晓嫦,刘志义,党朋,谭曼玲.室温强塑性变形下回溶和再析出的机理研究[J].材料科学与工艺,2005(02):178-181. |
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