本文選題：齒輪 + 疲勞壽命�。� 參考：《重慶大學》2011年碩士論文

【摘要】：齒輪傳動具有效率高、結構緊湊、工作可靠和傳動比穩(wěn)定等特點,廣泛應用于機械傳動領域。在齒輪所有失效形式中,疲勞斷齒所占比例最大,其次是表面接觸疲勞,因此疲勞破壞是齒輪失效的最主要形式之一。開展齒輪疲勞壽命及齒根裂紋仿真方法研究,對提高齒輪的可靠性和使用壽命具有重要的理論意義和工程應用價值。 本課題來源于國家科技支撐計劃項目。綜合運用機械疲勞分析理論、斷裂力學理論以及有限元法和邊界元法,對齒輪的疲勞壽命問題進行數(shù)值仿真分析。本文的主要研究工作如下: ①對風電機組各工況實測輸入轉矩的隨機載荷歷程進行雨流循環(huán)計數(shù),得到載荷循環(huán)數(shù)、均值與幅值的關系,并將其合成為轉矩總載荷譜。 ②在ANSYS中建立增速箱輸出級斜齒輪副的三維接觸有限元模型,計算靜載荷下斜齒輪副的應力應變;在FE-SAFE軟件中,考慮材料的S-N曲線和應變-壽命曲線,采用名義應力法和局部應力應變法計算了斜齒輪副的疲勞壽命,并研究了載荷、表面粗糙度、殘余應力以及輪齒修形對斜齒輪副疲勞壽命的影響規(guī)律。 ③采用三維斷裂分析軟件FRANC3D,對含半橢圓形初始裂紋的直齒輪模型進行邊界元分析,計算齒根裂紋前緣的應力強度因子,并研究了載荷、裂紋大小和裂紋形狀對齒根初始裂紋應力強度因子的影響規(guī)律。 ④利用FRANC3D的邊界元裂紋自動擴展功能,模擬了齒根和齒面裂紋的擴展軌跡,分析了齒根裂紋擴展過程中的裂紋張開位移和應力強度因子,并對齒根裂紋擴展壽命進行估算。
[Abstract]:Gear transmission is widely used in the field of mechanical transmission because of its high efficiency, compact structure, reliable operation and stable transmission ratio. Among all the failure modes of gears, fatigue tooth breakage is the largest, followed by surface contact fatigue, so fatigue failure is one of the most important forms of gear failure. The research on the simulation method of gear fatigue life and tooth root crack has important theoretical significance and engineering application value in improving the reliability and service life of gear. This topic comes from national science and technology support plan project. The fatigue life of gears is simulated by using mechanical fatigue analysis theory, fracture mechanics theory, finite element method and boundary element method. The main research work of this paper is as follows: 1 the random load history of the measured input torque of wind turbine is counted by the rain flow cycle, and the relationship between the load cycle number, the mean value and the amplitude is obtained. It is composed as the total torque load spectrum. 2 the three-dimensional contact finite element model of the output helical gear pair of the speed box is established in ANSYS to calculate the stress and strain of the helical gear pair under static load, and in the software FE-SAFE, the stress and strain of the helical gear pair are calculated under static load. Considering the S-N curve and the strain-life curve of the material, the fatigue life of the helical gear pair is calculated by using the nominal stress method and the local stress-strain method, and the load and surface roughness are studied. The influence of residual stress and gear tooth modification on the fatigue life of helical gear pair is analyzed by using the 3D fracture analysis software FRANC3D. the model of spur gear with half-ellipse initial crack is analyzed by boundary element method. The stress intensity factor of tooth root crack front is calculated, and the influence of load, crack size and crack shape on the stress intensity factor of tooth root initial crack is studied. The propagation trajectories of tooth root and tooth surface cracks are simulated and the crack opening displacement and stress intensity factor during tooth root crack propagation are analyzed and the crack propagation life of tooth root is estimated.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH132.41

【引證文獻】

相關博士學位論文 前1條

1 李偉;基于虛擬樣機技術的礦用重載減速器故障模擬研究[D];中國礦業(yè)大學(北京);2012年

相關碩士學位論文 前1條

1 湯慶儒;同軸對轉行星齒輪傳動優(yōu)化與有限壽命評價[D];重慶大學;2012年

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本文編號：2112285