【摘要】：針對具有面-面接觸特征的鋁合金緊固件,根據(jù)其接觸特點,建立有限元模型計算了其應(yīng)力場分布�？紤]接觸面高軸應(yīng)力梯度的力學(xué)響應(yīng),用接觸面應(yīng)力三維度的概念來反映微動疲勞多軸應(yīng)力狀態(tài)�？紤]損傷和彈塑性勢能的耦合,從熱力學(xué)第二定律出發(fā),基于損傷力學(xué)本構(gòu)方程,推導(dǎo)出基于熱力學(xué)耗散勢函數(shù)的耦合損傷演化模型。結(jié)合實驗參數(shù),得到預(yù)測鋁合金緊固件微動疲勞壽命的方法。壽命預(yù)測結(jié)果與實驗值進行對比,誤差分散在25%范圍內(nèi)。
[Abstract]:According to the contact characteristics of aluminum alloy fasteners with surface-surface contact characteristics, a finite element model was established to calculate the stress field distribution. Considering the mechanical response of high axial stress gradient of contact surface, the concept of three dimensional stress of contact surface is used to reflect the multiaxial stress state of fretting fatigue. Considering the coupling of damage and elastoplastic potential energy, based on the second law of thermodynamics and the constitutive equation of damage mechanics, a coupled damage evolution model based on thermodynamic dissipation potential function is derived. The method of predicting fretting fatigue life of aluminum alloy fasteners is obtained by combining the experimental parameters. The result of life prediction is compared with the experimental data, and the error is in the range of 25%.
【作者單位】： 中北大學(xué)機械與動力工程學(xué)院;
【分類號】：TG146.21;TH114

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