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-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.
参考文献
| [1] | Tolle M C, Kassner M E. Acta Metall 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 M E. 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. Acta 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 Phys Solids, 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 |
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