(中南林业科技大学机电工程学院，长沙 410004)
摘 要: 应力分布状况对于大型构件结构完整性评估非常重要，但很多应力测试方法难于对复杂构件进行深度应力测量，而深孔法(DHD)则可以有效地解决这一难题。研究深孔法测试技术原理，并运用有限元方法模拟深孔法测试过程，在对计算应力与仿真应力分布进行对比后，提出一种深孔法的改进算法。改进后的模型计算结果表明：深孔法计算获得的应力分布与实际结果吻合较好，平均误差小于20 MPa，同时，模型较好地解决这一测试方法对构件表面应力描述的局限性，完善构件深度应力场的测试技术。
关键字: 深孔法；力学模型；应力测试；铝合金
（School of Mechanical and Electronic Engineering,
Central South University of Forestry and Technology, Changsha 410004, China）
Abstract:The accurate determination of residual stress is essential to be taken into account in structural integrity assessment. For thick and complicated components, many non-destructive stress measurement techniques can not be used since they are unable to measure the stress along the depth within the component. The deep hole drilling (DHD) technique is a effective method to determine the stress within complicated engineering components. The mechanism of DHD and simulation experiment process were described, in which a improved calculating method was proposed by analyzing the original calculation model and compared simulation result with calculation data. The results of stress determination show that the improved computing method of DHD technique gets a good match with the real stress(deviation is less than 20 MPa) and can be used to measure residual stress of component surface with a high accuracy.
Key words: deep hole drilling; mechanical model; stress measurement; aluminum alloy
