【摘要】：文章以斜齒輪為研究對象,綜合考慮混合潤滑狀態(tài)下摩擦動(dòng)力學(xué)特性對齒面應(yīng)力分布的影響以及滲碳表層硬度梯度和殘余應(yīng)力的非均勻分布特征,以風(fēng)險(xiǎn)疲勞累積理論為基礎(chǔ)建立了疲勞裂紋萌生壽命預(yù)估模型;考慮裂紋在晶粒內(nèi)部的非線性擴(kuò)展規(guī)律以及晶界處的非連續(xù)擴(kuò)展特征,建立了短裂紋擴(kuò)展模型;針對長裂紋擴(kuò)展過程中不同階段擴(kuò)展速率的差異,建立了長裂紋擴(kuò)展速率統(tǒng)一方程,從而完成了對齒輪接觸區(qū)疲勞裂紋萌生及擴(kuò)展過程全壽命的預(yù)估.計(jì)算結(jié)果表明:齒面應(yīng)力分布受動(dòng)載荷和潤滑狀態(tài)的影響顯著;在殘余應(yīng)力作用下,有效剪切應(yīng)力在滲碳表層出現(xiàn)多個(gè)波峰,疲勞裂紋萌生位置多點(diǎn)化,導(dǎo)致裂紋尺度有所不同,疲勞壽命存在差異,失效形式多樣化.
[Abstract]:In this paper, helical gear is taken as the research object. The influence of friction dynamics on the stress distribution of tooth surface under mixed lubrication and the non-uniform distribution of hardness gradient and residual stress in Carburized surface are considered synthetically. Based on the theory of risk fatigue accumulation, the prediction model of fatigue crack initiation life is established, and the short crack propagation model is established considering the nonlinear propagation law of crack inside grain and the discontinuous propagation characteristics at grain boundary. According to the difference of growth rate in different stages of long crack propagation, the uniform equation of long crack growth rate is established, and the prediction of fatigue crack initiation and whole life of gear contact zone is completed. The calculated results show that the stress distribution on the tooth surface is significantly affected by the dynamic load and the lubrication state, and the effective shear stress appears several wave peaks in the surface layer of Carburizing under the action of residual stress, and the fatigue crack initiation position is multiple points. As a result, the crack size is different, the fatigue life is different, and the failure forms are diversified.
【作者單位】： 哈爾濱工業(yè)大學(xué)電氣工程及自動(dòng)化學(xué)院;北京精密機(jī)電控制設(shè)備研究所;
【分類號】：TH132.41

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