(重慶大學(xué) 機械傳動國家重點實驗室，重慶 400044)
摘 要: 基于實驗及Shiratori的有限元數(shù)據(jù)，擬合出鋁合金板淬火殘余應(yīng)力的分布函數(shù)，用Shen-Glinka法確定橢圓裂紋的Ⅰ型應(yīng)力強度因子的權(quán)函數(shù)，推導(dǎo)出權(quán)函數(shù)系數(shù)的表達式。在此基礎(chǔ)上分析幾種裂紋表面經(jīng)典應(yīng)力分布時的Ⅰ型應(yīng)力強度因子，與Shiratori的有限元結(jié)果吻合良好，驗證所建立的權(quán)函數(shù)具有較高的精度。結(jié)合淬火殘余應(yīng)力分布函數(shù)，推導(dǎo)出橢圓裂紋在淬火殘余應(yīng)力場中的Ⅰ型應(yīng)力強度因子，得出不同點殘余應(yīng)力強度因子隨裂紋擴展的變化趨勢不同。
關(guān)鍵字: 鋁合金；淬火殘余應(yīng)力；橢圓裂紋；應(yīng)力強度因子；權(quán)函數(shù)
（State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China）
Abstract:Based on the experiments and Shiratori’s finite element data, the distribution functions of quenching residual stress in aluminum alloy plates were fitted, the weight functions of elliptical crack were derived by Shen-Glinka’s method. The weight functions were verified using available finite element results for basic mode of residual stress fields and good agreement is achieved, which approves that the weight functions appear to be particularly suitable for residual stress fields. Combined with the quenching residual stress distribution function, the mode I stress intensity factors of elliptical cracks in residual stress field were calculated using the weight functions, and the trends of residual stress intensity factor with crack propagation at different points are different.
Key words: aluminum alloy; quenching residual stress; elliptical crack; stress intensity factor; weight function
