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

【摘要】：K型管結(jié)構(gòu)廣泛應(yīng)用于履帶起重機(jī)的臂架中,由于起重機(jī)在工作過程中交替進(jìn)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(fù)合載荷,其疲勞強(qiáng)度決定著起重機(jī)能否安全工作。因此,針對(duì)起重機(jī)臂架中的K型管接頭進(jìn)行抗疲勞設(shè)計(jì)顯得尤為重要。 本文基于熱點(diǎn)應(yīng)力法,以履帶起重機(jī)臂架底節(jié)危險(xiǎn)部位的K型管為研究對(duì)象,對(duì)典型載荷形式下的臂架進(jìn)行壽命評(píng)估,得到了適用于該種載荷形式下的壽命評(píng)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(duì)某型號(hào)25t輪胎起重機(jī)進(jìn)行數(shù)值分析,得到了臂架的危險(xiǎn)部位,并用應(yīng)力測(cè)試試驗(yàn)加以驗(yàn)證。 (2)詳細(xì)介紹K型管的有限元建模方法,對(duì)比不同的單元類型以及網(wǎng)格尺寸對(duì)熱點(diǎn)應(yīng)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(jìn)行參數(shù)化建模。 (3)建立了45個(gè)適應(yīng)于履帶起重機(jī)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(jìn)行數(shù)值分析,并考慮彎曲次應(yīng)力的影響,得到了K型管焊縫周圍應(yīng)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(shè)計(jì)提出相應(yīng)建議。 (4)對(duì)熱點(diǎn)應(yīng)力集中系數(shù)(SCF)進(jìn)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(duì)參數(shù)公式進(jìn)行了誤差分析。 (5)利用MATLAB軟件實(shí)現(xiàn)本文算法的可視化操作,能夠快速直觀地對(duì)不同規(guī)格的臂架進(jìn)行典型載荷形式下的壽命評(píng)估,為工程實(shí)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(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH213.7

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 高崇仁;賀小平;;存在裂紋缺陷的焊接箱形梁的可靠度計(jì)算[J];中國工程機(jī)械學(xué)報(bào);2006年03期

2 賈法勇,霍立興,張玉鳳,楊新岐;熱點(diǎn)應(yīng)力有限元分析的主要影響因素[J];焊接學(xué)報(bào);2003年03期

3 熊峻江,高鎮(zhèn)同,閻楚良,孟繁沛;飛機(jī)結(jié)構(gòu)疲勞加速譜編制及損傷概率分布[J];航空學(xué)報(bào);1997年01期

4 高鎮(zhèn)同，，熊峻江;疲勞／斷裂可靠性研究現(xiàn)狀與展望[J];機(jī)械強(qiáng)度;1995年03期

5 趙少汴;局部應(yīng)力應(yīng)變法及其設(shè)計(jì)數(shù)據(jù)[J];機(jī)械設(shè)計(jì);2000年02期

6 邵永波;;平衡軸力作用下K節(jié)點(diǎn)焊縫周圍應(yīng)力分布規(guī)律[J];機(jī)械工程學(xué)報(bào);2007年03期

7 王欣 ,高順德 ,屈福政;國內(nèi)外大型起重機(jī)的發(fā)展?fàn)顩r[J];建筑機(jī)械;2005年02期

8 聶宏,常龍;基于局部應(yīng)力應(yīng)變法估算高周疲勞壽命[J];南京航空航天大學(xué)學(xué)報(bào);2000年01期

9 熊峻江,劉文挺,高鎮(zhèn)同;疲勞裂紋擴(kuò)展速率試驗(yàn)數(shù)據(jù)的可靠性分析模型[J];強(qiáng)度與環(huán)境;1997年04期

10 邱法聚;王洋定;;基于局部應(yīng)力應(yīng)變法的大型港口起重機(jī)疲勞壽命估算[J];起重運(yùn)輸機(jī)械;2009年02期

本文編號(hào)：1738332