(中南林業(yè)科技大學(xué)機(jī)電工程學(xué)院，長沙 410004)
摘 要: 應(yīng)力分布狀況對(duì)于大型構(gòu)件結(jié)構(gòu)完整性評(píng)估非常重要，但很多應(yīng)力測(cè)試方法難于對(duì)復(fù)雜構(gòu)件進(jìn)行深度應(yīng)力測(cè)量，而深孔法(DHD)則可以有效地解決這一難題。研究深孔法測(cè)試技術(shù)原理，并運(yùn)用有限元方法模擬深孔法測(cè)試過程，在對(duì)計(jì)算應(yīng)力與仿真應(yīng)力分布進(jìn)行對(duì)比后，提出一種深孔法的改進(jìn)算法。改進(jìn)后的模型計(jì)算結(jié)果表明：深孔法計(jì)算獲得的應(yīng)力分布與實(shí)際結(jié)果吻合較好，平均誤差小于20 MPa，同時(shí)，模型較好地解決這一測(cè)試方法對(duì)構(gòu)件表面應(yīng)力描述的局限性，完善構(gòu)件深度應(yīng)力場(chǎng)的測(cè)試技術(shù)。
關(guān)鍵字: 深孔法；力學(xué)模型；應(yīng)力測(cè)試；鋁合金
（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
