金属学报  2004, Vol. 40 Issue (9): 920-926

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约束条件下界面纯铝层裂尖应力场的数值分析

韩礼红 李梁 孙军

西安交通大学金属材料强度国家重点实验室; 西安 710049

Numerical Analysis of the Crack-Tip Stress Field in Pure Aluminum Sheet Constrained by Interfaces

HAN Lihong; LI Liang; SUN Jun

State Key Laboratory for Mechanical Behavior of Materials; Xi'an Jiaotong University; Xi'an 110049

韩礼红; 李梁; 孙军 . 约束条件下界面纯铝层裂尖应力场的数值分析[J]. 金属学报, 2004, 40(9): 920-926 .
, , . Numerical Analysis of the Crack-Tip Stress Field in Pure Aluminum Sheet Constrained by Interfaces[J]. Acta Metall Sin, 2004, 40(9): 920-926 .

摘要 参考文献 相关文章 Metrics 全文: PDF(16917 KB)   摘要: 对强度错配约束条件下LY12/Al/LY12四点弯曲试样界面纯铝层内裂纹前端进行了弹塑性大变形平面应变应力场数值分析. 结果表明：在小范围屈服条件下随着中间纯铝层厚度的降低, 其峰值载荷呈线性增加；强界面的约束使得其塑性变形由类似单金属纺锤形转变为平行于界面的纵向发展, 该趋势随其厚度降低而越来越明显；裂尖三轴应力约束及最大拉应力水平随载荷增加或纯铝层厚度降低而升高, 且均随归一化J 积分增加沿一特定的路径变化. 当界面对纯铝层塑性变形约束明显增加时, 高的三轴约束将诱发微裂纹和孔洞的萌生, 同时伴随着中间纯铝层的脆化甚至局部解理. 关键词 ： 界面约束,  纯铝,  三轴应力      Abstract：Elastic-plastic large deformation finite element (FE) analysis was conducted on the crack-tip stress field of pure Al sheet in LY12/Al/LY12 sandwich specimen with a strength mismatch and fatigue pre-crack under plane strain condition. The results show that, in the condition of small scale yielding (SSY), the peak value of loadings linearly increases with decreasing pure Al sheet thickness. Plastic deformation zone in Al sheet constrained by interfaces will spread along the crack-tip ligament parallel to the two interfaces instead of a spindle-like in a constraint-free metal, and this tendency becomes more remarkable with decreasing pure Al thickness. The maximum triaxial constraint and the tensile stress continue to rise with either increasing load or decreasing pure Al thickness. The high triaxial constraint in the Al sheet results in cavitations and micro-cracks as well as brittleness even local cleavage of pure Al sheet. Key words： interface constraint    pure Al    stress triaxiality 收稿日期: 2003-09-25      ZTFLH:  TB33   服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 韩礼红 李梁 孙军 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y2004/V40/I9/920 [1] Tolle M C, Kassner M E. Ada Me.ta.ll Mater, 1995; 43:287 [2] Kassner M E, Kennedy T C, Schrems K K. Acta Mater,1998; 46: 6445 [3] Dalgleish B J, Trumble K P, Evans A G. Acta Metall,1989; 37: 1923 [4] Rosen R S, Kassner ME. J Vac Sci Technol, 1990; 8: 19 [5] Klassen R J, Weatherly G C, Ramaswami B. Metall Trans,1992; 23A: 3281 [6] Li M, Soboyejo W O. Metall Mater Trans, 2000; 31A: 1385 [7] Sun J, Boyd J D. Int J Press Ves Pip, 2000; 77: 369 [8] Varias A G, Suo Z, Shih C F. J Mech Phys Solids, 1991;39: 963 [9] Lin G Y, Kim Y J, Cornec A, Schwalbe K H. Comput Mater Sci, 1997; 9: 36 [10] Kim Y J, Lin G Y, Cornec A, Brocks W, Schwalbe K H.Int J Fract, 1996; 75: R9 [11] Tvergaard V, Huang Y, Hutchinson J W. Eur J Mech,1992; 11A: 215 [12] Chen J H, Wang Q, Wang G Z, Li Z. Ada Mater, 2003;51: 1841 [13] Han L H, Li L, Sun J. Acta Metall Sin, 2003; 39: 920(韩礼红,李梁,孙军.金属学报,2003;39:920) [14] Sun J. PhD thesis, Xi'an Jiaotong University, 1989(孙军.西安交通大学博士学位论文, 1989) [15] Huang Y, Hutchinson J W, Tvergaard V. J Mech PhysSolids, 1991; 39: 223 [16] Hsia K J, Suo Z, Yang W. J Mech Phys Solids, 1994; 42:877 [17] Cook R F, Suo Z. MRS Bull, 2002; 27(1) : 45 [1] 黄涛; 曲家惠; 胡卓超; 王福; 左良 . 高纯铝箔在异步轧制和再结晶过程中取向的演变[J]. 金属学报, 2005, 41(9): 953-957 . [2] 韩礼红; 李梁; 孙军 . 双界面约束下纯铝层韧脆转变行为的实验研究[J]. 金属学报, 2003, 39(9): 920-925 . [3] 胡津; 姚忠凯; 赵连城 . 晶须增强纯铝基复合材料表面腐蚀形貌的原子力显微术观察[J]. 金属学报, 2002, 38(9): 1002-1005 . [4] 吕爱强; 蒋奇武; 王福; 左良; 梁志德 . 异步轧制对高纯铝箔冷轧织构的影响[J]. 金属学报, 2002, 38(9): 974-978 . [5] 胡津; 任文超 . 纯铝基复合材料的应力腐蚀与氢致开裂[J]. 金属学报, 2002, 38(2): 174-176 . [6] 程英亮; 张鉴清 . NaCl溶液中LC4，LY12及纯铝腐蚀过程的电化学噪声特征[J]. 金属学报, 2002, 38(1): 74-78 . [7] 王桂芹; 刘顺华 . 硼对工业纯Al导电性的影响[J]. 金属学报, 2000, 36(6): 597-601 . [8] 袁立曦;方前锋. 内耗数据的非线性拟合及其在纯铝竹节晶界弛豫中的应用[J]. 金属学报, 1998, 34(10): 1016-1020. [9] 夏月波;王中光. 粗晶纯Al多晶材料的循环形变——Ⅱ.断口形貌[J]. 金属学报, 1992, 28(3): 21-26. [10] 程波林;葛庭燧. 晶粒间界局域无序化引起的滞弹性弛豫[J]. 金属学报, 1990, 26(5): 5-10. Viewed Full text Abstract Cited   Shared      Discussed