【摘要】：本文以某粉末冶金公司自主研發(fā)試制的鐵基粉鍛連桿為對象,研究采用新工藝、新材料生產(chǎn)的高致密輕量化連桿的疲勞性能,找出鐵基粉鍛連桿在結(jié)構(gòu)、原料化學(xué)成分及配比、加工工序等方面存在的問題,為粉鍛連桿規(guī)�；a(chǎn)提供參考依據(jù)。通過拉伸性能試驗,研究了不同Cu含量對連桿力學(xué)性能的影響,并由此確定了用于疲勞試驗的鐵基粉鍛連桿的成分配比。根據(jù)循環(huán)對稱載荷下的疲勞試驗數(shù)據(jù),得到了雙坐標坐標下S-N曲線的擬合直線,并計算得到了S-N曲線方程表達式,同時預(yù)估了疲勞極限;通過恒平均載荷下的疲勞試驗,初步判定了壓載荷下連桿的疲勞極限;統(tǒng)計了疲勞斷裂的位置,從而得知了粉鍛連桿容易發(fā)生斷裂的部位;分析了疲勞斷口,從宏觀和微觀上對疲勞破壞機理進行了研究;依據(jù)發(fā)動機運行工況下連桿的受力分析,結(jié)合疲勞試驗結(jié)果,對連桿進行了靜強度分析,得到了兩種工況下的應(yīng)力分布云圖;基于試驗S-N曲線和靜力分析的基礎(chǔ),進行了連桿組件疲勞仿真分析,得到了恒幅載荷下的疲勞壽命云圖、安全系數(shù)云圖和變幅載荷下的損傷云圖,并和試驗結(jié)果做了對比。
[Abstract]:In this paper, the fatigue properties of a high-density lightweight connecting rod manufactured by a powder metallurgy company, which is manufactured by a new technology and new material, are studied. The structure, chemical composition and proportion of the iron based powder forging rod are found out. The problems in processing procedure provide reference for mass production of powder forging connecting rod. The effect of Cu content on the mechanical properties of connecting rod was studied by tensile test, and the composition ratio of iron based powder forging connecting rod for fatigue test was determined. According to the fatigue test data under cyclic symmetric load, the fitting line of S-N curve under double coordinates is obtained, the expression of S-N curve equation is calculated, and the fatigue limit is predicted. The fatigue limit of connecting rod under compression load is preliminarily determined, the position of fatigue fracture is calculated, and the position of fracture of powder forging connecting rod is obtained, the fatigue fracture surface is analyzed, and the fatigue failure mechanism is studied from macroscopic and microscopic point of view. According to the stress analysis of the connecting rod under the engine operating condition and the fatigue test results, the static strength analysis of the connecting rod is carried out, and the stress distribution cloud diagram under two working conditions is obtained, which is based on the test S-N curve and the static analysis. The fatigue simulation analysis of the connecting rod assembly is carried out, and the fatigue life cloud diagram, the safety factor cloud diagram and the damage cloud diagram under variable amplitude load are obtained under constant amplitude load, and the results are compared with the experimental results.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK403;TF125

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