本文選題：履帶起重機 + K型管　； 參考：《大連理工大學》2014年碩士論文

【摘要】：K型管結(jié)構(gòu)廣泛應用于履帶起重機的臂架中,由于起重機在工作過程中交替進行吊載和卸載,臂架弦腹桿相交而成的K型管焊接區(qū)域承受拉壓復合載荷,其疲勞強度決定著起重機能否安全工作。因此,針對起重機臂架中的K型管接頭進行抗疲勞設計顯得尤為重要。 本文基于熱點應力法,以履帶起重機臂架底節(jié)危險部位的K型管為研究對象,對典型載荷形式下的臂架進行壽命評估,得到了適用于該種載荷形式下的壽命評估理論算法。論文的主要工作及成果如下： (1)采用有限元軟件ANSYS對某型號25t輪胎起重機進行數(shù)值分析,得到了臂架的危險部位,并用應力測試試驗加以驗證。 (2)詳細介紹K型管的有限元建模方法,對比不同的單元類型以及網(wǎng)格尺寸對熱點應力的影響。提出了一種更加適合批量化建模的焊縫模擬方法,并采用APDL語言進行參數(shù)化建模。 (3)建立了45個適應于履帶起重機桁架臂幾何參數(shù)的K型管有限元模型,按照臂架的典型受力方式進行數(shù)值分析,并考慮彎曲次應力的影響,得到了K型管焊縫周圍應力集中系數(shù)隨幾何參數(shù)的分布規(guī)律,為臂架的抗疲勞設計提出相應建議。 (4)對熱點應力集中系數(shù)(SCF)進行非線性回歸,得到了SCF關(guān)于幾何參數(shù)τ、β、γ以及φ的參數(shù)擬合公式,并對參數(shù)公式進行了誤差分析。 (5)利用MATLAB軟件實現(xiàn)本文算法的可視化操作,能夠快速直觀地對不同規(guī)格的臂架進行典型載荷形式下的壽命評估,為工程實踐提供參考。
[Abstract]:The K-type pipe structure is widely used in the jib of crawler crane. Because the crane alternately hoist and unload during the working process, the welded area of K-type pipe with the jib chord webs intersecting is subjected to the composite load of tension and compression.Its fatigue strength determines whether the crane can work safely.Therefore, it is very important to design K-type pipe joints in crane jib.Based on the hot spot stress method, this paper takes the K-shaped pipe at the dangerous part of the bottom joint of the crawler crane as the research object, evaluates the life of the jib under the typical load form, and obtains the theoretical algorithm of life evaluation suitable for this kind of load form.The main work and results are as follows:1) numerical analysis of a 25t tire crane is carried out by using finite element software ANSYS, and the dangerous position of the boom is obtained, which is verified by stress test.The finite element modeling method of K type tube is introduced in detail, and the effect of different element types and mesh size on hot spot stress is compared.A welding seam simulation method is proposed, which is more suitable for mass modeling, and parameterized modeling is carried out by using APDL language.In this paper, 45 finite element models of K-tube are established, which are suitable for geometric parameters of truss arm of crawler crane. Numerical analysis is carried out according to typical stress mode of boom, and the influence of bending secondary stress is considered.The distribution of the stress concentration factor around the weld seam of K-shaped pipe with geometric parameters is obtained, and the corresponding suggestions for the anti-fatigue design of the jib are put forward.(4) the nonlinear regression of the stress concentration factor of hot spots is carried out, and the fitting formulas of parameters 蟿, 尾, 緯 and 蠁 of SCF are obtained, and the error analysis of the formula is given.5) the visual operation of this algorithm is realized by using MATLAB software, which can evaluate the life of the boom of different specifications under typical load forms quickly and intuitively, and provide a reference for engineering practice.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH213.7

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