过盈配合7050铝合金套筒三维应力分布的中子衍射分析  

Three-dimensional stress distribution of surplus assembled 7050Al alloy ring and plug determined by neutron diffraction

作　　者：孙光爱[1,2] 汪小琳[1,2] 吴二冬[3] 李建[1] 陈彦舟[1] 陈波[1] 盛六四[2] LUZIN Vladimir GYULA Torok 

机构地区：[1]中国工程物理研究院中子物理学重点实验室,核物理与化学研究所,绵阳621900 [2]中国科学技术大学核科学技术学院,合肥230026 [3]中国科学院金属研究所,沈阳110016 [4]The Bragg Institute,Australian Nuclear Science and Technology Organisation,Kirrawee,DC NSW2232,Australia [5]Research Institute for Solid State Physicsand Optics,Budapest,H-1525-49,Hungary

出　　处：《科学通报》2013年第11期1000-1006,共7页Chinese Science Bulletin

基　　金：国家自然科学基金(91126001;11105128);澳大利亚核科学与技术研究院布拉格研究所(ANSTO;Bragg Institute)项目(DB1956);中国工程物理研究院科学技术发展基金(2010A0103002);中国工程物理研究院核物理与化学研究所科学技术创新基金(2009CX01)资助

摘　　要：中子衍射技术用于材料和工程部件内部的应力分析正在国内外引起广泛关注.为了推动该技术的发展和应用,本文利用中子衍射技术对过盈配合7050铝合金套筒的(200)和(311)晶面进行了测量,得到了套筒不同位置的环向、径向和轴向三维应变和应力分布,并将实验结果与理论计算和国际标样数据进行了比较,数据可以较好地符合,能够清晰反映铝合金套筒界面处的应力和应变梯度变化.针对常波长中子衍射测量试样外表面区域应力(变)偏差较大的技术问题,利用蒙特卡罗方法进行了模拟实验,提出了径向准直方法以提高测量精度.通过细致分析两种晶面的中子衍射实测与解析计算结果,我们发现晶间应变分配会引起应力测量的系统偏差,通过准确地预估晶间应变分配可进一步提高应力测量精度.若样品中存在微观应力和织构,也会影响测量结果的准确性,特别是在具有显著应力梯度的区域,必须尽量减小试样中的衍射体积才能取得有效数据.The hoop, radial and axial stress and strain distribution of surplus assembled 7050A1 alloy ring and plus were investigated by neutron diffraction method. The measured results from crystal planes （200） and （311） are coincided with the data obtained by analytical calculation and international standard sample experiment. The discontinuous stress and strain at the interference of ring and plug can be clearly shown by the neutron diffraction method. Monte Carlo method was used to simulate the neutron diffraction process to reduce the deviation of the stress at the surface. The results show that the measured accuracy can be improved when the slits are substituted by the radial collimation. Compared the results obtained from （311） and （200） with analytical calculation, it reveals that the stress distribution among crystal planes will cause system deviation. Therefore the experiment accuracy may be further improved if the inner plane stress could be evaluated. The results also indicate that the strain accuracy will be affected by microstress and texture, and the gauge volume should be reduced as small as possible at the region where the stress distribution is steep.

关 键 词：中子衍射 7050铝合金 三维应力分布 测量精度 

分 类 号：TB302.5[一般工业技术—材料科学与工程]