本文關(guān)鍵詞：基于離散元法的瀝青混凝土切削數(shù)值模擬　出處：《湘潭大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 瀝青混凝土 離散元法 PFC 數(shù)值模擬 切削力

【摘要】：隨著高速公路的不斷發(fā)展，，路面養(yǎng)護(hù)機(jī)械中的路面銑刨機(jī)的需求量也隨之增加。路面銑刨機(jī)的工作原理是利用子彈頭刀具對(duì)損壞的瀝青混凝土路面進(jìn)行切削，再重新攤鋪新的瀝青混凝土。瀝青混凝土是一種具有粘彈性和流變特性的多相復(fù)合材料，而有限元在處理非連續(xù)介質(zhì)力學(xué)有著固有的缺陷。本文提出采用離散元數(shù)值方法來模擬瀝青混凝土的切削，從而預(yù)測刀具的受力，分析離散元顆粒流軟件PFC中二維和三維在模擬瀝青混凝土切削的優(yōu)缺點(diǎn)，深入地研究瀝青混凝土切削中刀具受力的變化，得到合理、最優(yōu)的刀具工作參數(shù)，達(dá)到提高切削效率的目的。本文主要工作如下： 1、介紹路面銑刨機(jī)的工作原理和瀝青混凝土數(shù)值方法研究的現(xiàn)狀和進(jìn)展，介紹離散元顆粒流軟件（Particle Flow Code簡稱PFC）在研究瀝青混凝土切削問題上的優(yōu)勢和其基本原理。 2、采用微機(jī)控制萬能試驗(yàn)機(jī)對(duì)瀝青混凝土進(jìn)行室內(nèi)單軸壓縮實(shí)驗(yàn)，測得瀝青混凝土的彈性模量和抗壓強(qiáng)度。 3、以瀝青混凝土的膠漿理論為基礎(chǔ)結(jié)合顆粒流軟件內(nèi)置的本構(gòu)模型建立瀝青混凝土的二維和三維模型。采用顆粒流軟件的FISH語言編寫程序建立虛擬的單軸壓縮試驗(yàn)和劈裂試驗(yàn)對(duì)瀝青混凝土離散元模型進(jìn)行校核，校準(zhǔn)其抗壓強(qiáng)度、彈性模量、泊松比和抗拉強(qiáng)度。 4、采用AutoCAD建立刀具的模型導(dǎo)入PFC2D建立瀝青混凝土的二維切削模型，采用PRO/E建立刀具的模型導(dǎo)入PFC3D中建立三維的切削模型，分別進(jìn)行切削模擬，分析刀具受力，得出三維的切削模擬更適合于模擬子彈頭刀具切削瀝青混凝土，預(yù)測刀具的受力。 5、先采用單因素法，后采用正交試驗(yàn)法分析切削速度、切入角和切削深度三因素對(duì)子彈頭刀具在切削瀝青混凝土的切削力的影響，得到最優(yōu)的切削參數(shù)為： c=5m/s，0=45°，a p=5mm。
[Abstract]:With the continuous development of highway, the demand of pavement milling machine in pavement maintenance machinery is also increasing. The working principle of pavement milling machine is to use bullet cutter to cut the damaged asphalt concrete pavement. The asphalt concrete is a kind of multiphase composite material with viscoelastic and rheological properties. The finite element method has inherent defects in dealing with discontinuous medium mechanics. In this paper, the discrete element numerical method is proposed to simulate the cutting of asphalt concrete, so as to predict the force of cutting tools. The advantages and disadvantages of 2D and 3D in simulating asphalt concrete cutting in discrete element particle flow software PFC are analyzed. The change of cutting tool force in asphalt concrete cutting is deeply studied and the reasonable and optimal cutting tool working parameters are obtained. The main work of this paper is as follows: 1. The working principle of pavement milling machine and the research status and progress of asphalt concrete numerical method are introduced. This paper introduces the advantages and basic principle of particle Flow Code (Particle Flow Code) in the research of bituminous concrete cutting problem. 2. The indoor uniaxial compression test of asphalt concrete was carried out by using a microcomputer controlled universal testing machine, and the elastic modulus and compressive strength of asphalt concrete were measured. 3. Based on the slurry theory of asphalt concrete and the constitutive model built into the particle flow software, the two-dimensional and three-dimensional models of asphalt concrete are established. The virtual uniaxial compression is established by using the FISH language of the particle flow software. Shrinkage test and splitting test were used to check the discrete element model of asphalt concrete. Calibrate its compressive strength, elastic modulus, Poisson's ratio and tensile strength. 4. The cutting tool model of AutoCAD is introduced into PFC2D to establish the two-dimensional cutting model of asphalt concrete. The cutting tool model established by PRO/E is imported into PFC3D to establish a three-dimensional cutting model. The cutting simulation is carried out respectively and the cutting tool force is analyzed. It is concluded that the 3D cutting simulation is more suitable for simulating the cutting of asphalt concrete with bullet cutters and predicting the force of the cutting tools. 5. The single factor method is used first, then the orthogonal test method is used to analyze the influence of cutting speed, cutting angle and cutting depth on the cutting force of bullet cutter in cutting asphalt concrete. The optimum cutting parameters are obtained as follows: cn = 5 m / s 0 ~ 45 擄/ p ~ (-1) ~ (5) m ~ (-1).
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U418.32

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 郭迎福;段明濤;;路面銑刨機(jī)銑刨鼓的刀具布置[J];工程機(jī)械;2006年05期

2 葉勇;沈劍云;;巖石切削過程中破壞機(jī)制的離散元分析[J];工具技術(shù);2008年12期

3 姜?jiǎng)購?qiáng);譚援強(qiáng);楊冬民;盛勇;;碳化硅單點(diǎn)金剛石超精密切削加工殘余應(yīng)力的離散元模擬[J];硅酸鹽學(xué)報(bào);2010年05期

4 王端宜;劉敬輝;劉宇;;瀝青混合料粘彈塑性斷裂參數(shù)的研究[J];華南理工大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年11期

5 周里群;邢國;劉宏;李玉平;劉亞;;基于ABAQUS的瀝青混凝土銑削建模[J];建設(shè)機(jī)械技術(shù)與管理;2010年05期

6 李海軍,賈登基,李文耀;路面銑刨機(jī)刀具的選型及正確使用[J];建筑機(jī)械;2001年12期

7 劉偉;路面銑刨機(jī)械的發(fā)展前景與市場展望[J];科技情報(bào)開發(fā)與經(jīng)濟(jì);2004年04期

8 楊剛;張肖寧;;研究瀝青混合料的離散單元法(英文)[J];科學(xué)技術(shù)與工程;2007年14期

9 張江宇;;中國十二五期間鐵路、高速公路發(fā)展規(guī)劃與建設(shè)[J];建設(shè)機(jī)械技術(shù)與管理;2011年06期

10 紀(jì)玉杰;曹學(xué)濤;;截齒截割煤巖的離散元法仿真方法研究[J];礦業(yè)研究與開發(fā);2013年02期

相關(guān)博士學(xué)位論文 前1條

1 田莉;基于離散元方法的瀝青混合料勁度模量虛擬試驗(yàn)研究[D];長安大學(xué);2008年

本文編號(hào)：1389081