【摘要】：功能梯度材料概念(Functionally Graded Materials,簡(jiǎn)稱FGM)于1987年由日本科技廳提出,該種材料在零件內(nèi)部按照一定的分布函數(shù)呈梯度狀分布,使得該零件在力學(xué)等性能上也呈梯度變化。傳統(tǒng)的基于物理或化學(xué)的功能梯度材料制造方法存在如下缺點(diǎn):1、只能制備形狀結(jié)構(gòu)簡(jiǎn)單的功能梯度材料塊體或材料環(huán);2、不能制造嵌入器件零件;3、制備功能梯度材料時(shí)不能實(shí)現(xiàn)各材料組分相在一定范圍內(nèi)的精確控制,不能正確反映設(shè)計(jì)者的意圖,從而影響材料性能發(fā)揮�；陔x散/堆積原理的快速成型(Rapid Prototyping,RP)技術(shù)為功能梯度材料零件的制備提供了一種可能手段,并且能在制備材料的同時(shí)制造零件。在目前的快速成型領(lǐng)域,一方面,商業(yè)化的功能梯度材料成型機(jī)并不存在,一些商業(yè)上的CAD軟件尚不具備表示功能梯度材料實(shí)體零件材料屬性的能力;另一方面,許多特殊的應(yīng)用場(chǎng)合對(duì)快速成型技術(shù)卻提出了更高的要求。本文以快速成形技術(shù)為背景,針對(duì)復(fù)雜零件功能梯度材料模型的CAD表達(dá)方法、切片和路徑生成方法行了深入理論分析和研究,設(shè)計(jì)并開(kāi)發(fā)一款STL模型到FGM模型表達(dá)可視化和路徑生成的軟件系統(tǒng),為基于RP的功能梯度材料零件制造提供技術(shù)基礎(chǔ)。主要完成了以下工作:1.建立無(wú)冗余數(shù)據(jù)的STL模型頂點(diǎn)、半邊和面之間的拓?fù)潢P(guān)系,提出了STL(StereoLithography)文件各類錯(cuò)誤及缺陷的診斷及修復(fù)算法;提出基于半邊曲率的Loop模式的自適應(yīng)曲面細(xì)分算法,在整體上用較少的三面片準(zhǔn)確的表示模型,以保證STL模型曲面精度。2.系統(tǒng)研究了網(wǎng)格模型體素化方法,提出并實(shí)現(xiàn)了基于四叉樹(shù)的Ray-Casting體素化CAD模型的方法,分析了基于數(shù)字距離變換計(jì)算從體素到參考特征距離的方法。3.提出基于物體空間的FGM模型可視化路線,分析了FGM切片層厚對(duì)幾何切片誤差和材料切片誤差的影響,給出了基于體素模型的功能梯度材料零件切片算法。4.研究了基于FGM模型的等材料等值線路徑生成方法,提出了一種多區(qū)域輪廓的曲線偏置算法。設(shè)計(jì)了一款兼FGM模型可視化、切片和路徑規(guī)劃為一體的FGM-CAD軟件。
[Abstract]:The concept of functionally graded material (Functionally Graded Materials,) was proposed by the Japan Science and Technology Agency in 1987. The material has a gradient distribution in the part interior according to a certain distribution function, so that the mechanical properties of the part also show gradient changes. The traditional methods of fabricating functionally graded materials based on physics or chemistry have the following disadvantages: (1) the functional gradient materials (FGMs) with simple shape and structure can only be fabricated; (2) the parts of embedded devices can not be fabricated; 3, the preparation of functionally graded materials can not achieve the precise control of the phase of each material in a certain range, and can not reflect the designer's intention correctly, thus affecting the performance of the materials. The rapid prototyping (Rapid Prototyping,RP) technology based on the discrete / stacking principle provides a possible method for the preparation of functionally graded material parts, and it can be used to fabricate parts at the same time as the materials are prepared. In the current rapid prototyping field, on the one hand, the commercial functional gradient material molding machine does not exist, some commercial CAD software does not have the ability to represent the material properties of functionally graded material solid parts; On the other hand, many special applications put forward higher requirements for rapid prototyping technology. In this paper, based on rapid prototyping technology, the CAD expression method, slice and path generation method of the functionally graded material model of complex parts are analyzed and studied deeply. A software system for visualization and path generation from STL model to FGM model is designed and developed, which provides a technical basis for the manufacturing of functionally graded material parts based on RP. The following work has been accomplished: 1. The topological relationship among the vertices, half sides and faces of STL model without redundant data is established, and the algorithms for diagnosing and repairing all kinds of errors and defects in STL (StereoLithography) files are put forward. An adaptive surface subdivision algorithm based on Loop mode based on half-edge curvature is proposed. The model is accurately represented by less trihedral patches on the whole in order to ensure the surface accuracy of STL model. 2. The voxel method of grid model is studied systematically, the method of Ray-Casting voxel CAD model based on quad tree is proposed and implemented, and the method of calculating the distance from voxel to reference feature based on digital distance transformation is analyzed. 3. The method of calculating voxel to reference feature distance based on digital distance transformation is analyzed. The visualization route of FGM model based on object space is put forward. The influence of slice thickness of FGM slice on geometric slice error and material slice error is analyzed. The slice algorithm of functionally graded material based on voxel model is given. 4. The contour path generation method based on FGM model is studied, and a curve offset algorithm based on multi-region contour is proposed. A FGM-CAD software for visualization, slicing and path planning of FGM model is designed.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB34

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李靜波;楊繼全;施建平;;基于空間點(diǎn)云數(shù)據(jù)的異質(zhì)材料零件數(shù)字化模型[J];現(xiàn)代制造工程;2013年02期

2 張爭(zhēng)艷;王小平;胡吉全;陳定方;陶孟侖;;快速成形領(lǐng)域的多材料零件表示算法[J];機(jī)械工程學(xué)報(bào);2013年03期

3 楊繼全;朱玉芳;李靜波;施建平;;基于空間點(diǎn)云數(shù)據(jù)的異質(zhì)材料零件動(dòng)態(tài)建模方法[J];中國(guó)機(jī)械工程;2012年20期

4 馬濤;趙忠民;劉良祥;高超;黃雪剛;;功能梯度材料的研究進(jìn)展及應(yīng)用前景[J];化工科技;2012年01期

5 朱玉芳;楊繼全;王昌明;;基于空間微四面體的異質(zhì)材料零件建模方法[J];機(jī)械工程學(xué)報(bào);2012年01期

6 王素;王彥;高峰;;功能梯度材料零件層片路徑掃描算法[J];北京科技大學(xué)學(xué)報(bào);2011年11期

7 吳曉軍;劉偉軍;;異質(zhì)材料CAD模型可視化算法[J];中國(guó)機(jī)械工程;2010年17期

8 楊光;劉偉軍;王維;田鳳杰;;STL格式文件拓?fù)渲亟翱焖偾衅惴ㄑ芯縖J];現(xiàn)代制造工程;2009年10期

9 唐宗軍;王新雷;王宇寧;張庭海;魏彬;;STL格式文件的拓?fù)渲亟ǚ椒ㄑ芯縖J];機(jī)械;2009年04期

10 徐娜;李晨希;李榮德;尹紅霞;;功能梯度材料的制備、應(yīng)用及發(fā)展趨勢(shì)[J];材料保護(hù);2008年05期

，

本文編號(hào)：2437711