本文關(guān)鍵詞：輕量化橋式起重機(jī)主梁焊縫疲勞壽命研究　出處：《大連理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 橋式起重機(jī) 輕量化 焊縫 等效結(jié)構(gòu)應(yīng)力 疲勞壽命

【摘要】：橋式起重機(jī)在國民經(jīng)濟(jì)的各行各業(yè)中有著廣泛的應(yīng)用,隨著我國現(xiàn)代化建設(shè)發(fā)展的需要,橋式起重機(jī)的產(chǎn)量迅速增長。然而,我國現(xiàn)有的通用型橋式起重機(jī)主要技術(shù)多沿用原蘇聯(lián)上世紀(jì)50年代的產(chǎn)品結(jié)構(gòu)形式,雖然經(jīng)過多次改進(jìn),但與目前國際領(lǐng)先水平比較仍存在很大差距。 輕量化橋式起重機(jī)采用了先進(jìn)的結(jié)構(gòu)與技術(shù),對起重機(jī)主梁、端梁、小車架等金屬結(jié)構(gòu)進(jìn)行優(yōu)化,減輕結(jié)構(gòu)重量,降低生產(chǎn)成本。主梁是橋式起重機(jī)的主要承載部件,輕量化技術(shù)的應(yīng)用使主梁金屬結(jié)構(gòu)在滿足強度、剛度、穩(wěn)定性的前提下實現(xiàn)減重。輕量化主梁的疲勞強度將直接決定整機(jī)的使用壽命。橋式起重機(jī)的主梁為焊接箱形結(jié)構(gòu),主梁破壞大部分是焊接結(jié)構(gòu)的疲勞破壞。因此,研究主梁焊縫疲勞壽命是橋式起重機(jī)輕量化設(shè)計的重要內(nèi)容。 本文基于等效結(jié)構(gòu)應(yīng)力焊縫疲勞分析理論,將有限元分析軟件ANSYS作為獲得焊縫焊趾處的節(jié)點力和彎矩的工具,利用疲勞分析軟件FE-SAFE中以等效結(jié)構(gòu)應(yīng)力為核心技術(shù)的VERITY模塊計算焊縫節(jié)點的等效結(jié)構(gòu)應(yīng)力和疲勞壽命,最后通過ANSYS后處理模塊得到焊縫的疲勞壽命云圖。針對輕量化主梁焊縫疲勞壽命問題,論文的主要工作如下： (1)研究了等效結(jié)構(gòu)應(yīng)力焊接疲勞分析方法,對FE-SAFE軟件VERITY模塊焊縫疲勞分析流程進(jìn)行詳細(xì)說明。 (2)對輕量化主梁進(jìn)行有限元靜強度分析,在主梁結(jié)構(gòu)滿足強度設(shè)計要求的前提下,分析主梁焊縫疲勞壽命,并對焊縫疲勞壽命的影響因素進(jìn)行分析,得出各影響因素對焊縫疲勞壽命的影響規(guī)律,最后提出滿足主梁抗疲勞性能的焊縫結(jié)構(gòu)形式。 (3)完成主梁焊縫疲勞試驗。通過主梁焊縫疲勞試驗獲得大量的試驗數(shù)據(jù),驗證了新型起重機(jī)主梁結(jié)構(gòu)的設(shè)計安全性,為輕量化橋式起重機(jī)設(shè)計基礎(chǔ)研究積累了有效數(shù)據(jù)和設(shè)計經(jīng)驗。
[Abstract]:Bridge cranes are widely used in all walks of life of the national economy. With the development of modernization in China, the output of bridge cranes is increasing rapidly. The main technology of the existing bridge crane in our country mostly follows the product structure form of the former Soviet Union in -50s. Although it has been improved many times, there is still a big gap with the international leading level at present. The light weight bridge crane adopts advanced structure and technology to optimize the metal structure such as the main girder, end beam, small frame and so on, to reduce the weight of the structure. The main beam is the main bearing part of the bridge crane. The application of lightweight technology makes the main beam metal structure meet the strength and stiffness. The fatigue strength of lightweight main beam will directly determine the service life of the whole machine. The main girder of bridge crane is welded box structure. The main beam failure is mostly the fatigue failure of welded structure. Therefore, it is important to study the fatigue life of the main beam weld seam in the lightweight design of bridge crane. Based on the equivalent stress weld fatigue analysis theory, the finite element analysis software ANSYS is used as a tool to obtain the joint force and bending moment at the weld toe. The equivalent structural stress and fatigue life of weld joints are calculated by using the VERITY module with equivalent structural stress as the core technology in the fatigue analysis software FE-SAFE. Finally, the fatigue life of weld is obtained by ANSYS post-processing module. The main work of this paper is as follows: 1) the fatigue analysis method of equivalent structure stress welding is studied, and the flow of weld fatigue analysis of FE-SAFE software VERITY module is described in detail. 2) the finite element static strength analysis of lightweight main beam is carried out, and the fatigue life of weld seam of main beam is analyzed on the premise that the structure of main beam meets the requirement of strength design, and the influencing factors of fatigue life of welding seam are analyzed. The effects of various factors on the fatigue life of the weld are obtained. Finally, the weld structure which meets the fatigue resistance of the main beam is put forward. Through the fatigue test of the main beam weld, a large number of test data are obtained, which verifies the design safety of the main girder structure of the new crane. It has accumulated effective data and design experience for the basic research of lightweight bridge crane design.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TH215

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 王松雷;;我國起重機(jī)輕量化設(shè)計存在的困難及建議[J];起重運輸機(jī)械;2012年08期

2 賈旺興;房師平;張鵬鵬;;談我國起重機(jī)輕量化的推廣應(yīng)用[J];現(xiàn)代制造技術(shù)與裝備;2013年01期

相關(guān)博士學(xué)位論文 前1條

1 周張義;高速貨車轉(zhuǎn)向架焊接部件疲勞強度研究[D];西南交通大學(xué);2009年

，

本文編號：1427910