7055-T7751铝合金预拉伸板内部残余应力分布评估  

Evaluation of Residual Stress in Depth Profile of 7055-T7751 Pre-Stretched Aluminum Alloy Plate

作　　者：宋寒[1] 杨吟飞[1] 陈波[2] 郑晓伟[2] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]中航工业西安飞机工业(集团)有限责任公司,陕西西安710089

出　　处：《机械制造与自动化》2016年第1期18-21,共4页Machine Building & Automation

基　　金：国家自然科学基金(51405226);江苏省自然基金青年科学基金(SBK2014043631)

摘　　要：应用裂纹柔度法测量了7055-T7751铝合金预拉伸板的内部残余应力。结果表明,该板材内部残余应力近似呈外压内拉的"W型曲线"分布,其中,轧制方向最大残余拉应力约为31.3 MPa,最大残余压应力约为-23.7 MPa,宽度方向最大残余拉应力约为7.1 MPa,最大残余压应力约为-12.8 MPa。相比较于其他典型7×××系列铝合金预拉伸板,7055作为目前合金化程度最高、强度也最高的铝合金,在提高性能的同时,内部残余应力也相应提高,导致加工变形较大。The through-thickness residual stress of 7055-T7751 pre-stretched aluminum alloy plate is measured, using the crack compliance method. It turns out that the residual stress can be revealed by approximate ＂W-shaped curve＂ ： the exterior residual compressive stress （RCS） and the interior residual tensile stress （RTS）. The maximum RTS and RCS are about 31.3 MPa and -23.7 MPa in the rolling direction respectively, the maximum RTS and RCS are about 7.1 MPa and -12.8MPa in transverse direction respectively. Compared to other typical 7××× series aluminum alloys, 7055 is of optimum mechanical performance in its alloying degree and strength by now, while its residual stress increases correspondingly, it leads to much greater machining deformation.

关 键 词：7055-T7751铝合金板 裂纹柔度法 残余应力 

分 类 号：V252.2[一般工业技术—材料科学与工程]