本文選題：選區(qū)激光熔化 + 異質(zhì)材料��； 參考：《北京理工大學(xué)》2015年碩士論文

【摘要】：功能梯度材料的研究已經(jīng)迅速成為國內(nèi)外研究的活躍項(xiàng)目,功能梯度材料是一種新型的功能復(fù)合材料,它的兩側(cè)由不同性質(zhì)的材料組成,中間部分的組成和結(jié)構(gòu)連續(xù)地呈梯度變化,從而使材料的性質(zhì)和功能也呈梯度變化,克服了不同材料的不匹配因素。選區(qū)激光熔化成形技術(shù)(Selective Laser Melting,簡稱SLM)是近十幾年才發(fā)展起來的新型快速成形(Rapid Prototyping)技術(shù),獨(dú)特的優(yōu)越性使其成為最有發(fā)展?jié)摿Φ目焖俪尚渭夹g(shù)之一。在成形過程中遇到兩種材料需要同時(shí)成形的時(shí)候,由于不同的材料有不同的屬性,所以兩種材料結(jié)合處的成形對(duì)試驗(yàn)參數(shù)及工藝參數(shù)提出了特殊的要求。本文首先提出了一種用SLM設(shè)備制備異質(zhì)材料零件的方法,并對(duì)其主要執(zhí)行機(jī)構(gòu)進(jìn)行了設(shè)計(jì)。接下來采用計(jì)算機(jī)數(shù)值模擬的方法,對(duì)SLM成形過程中兩種材料的結(jié)合處進(jìn)行了深入研究。采用材料單元屬性變換和單元生死技術(shù)相結(jié)合的方法,在考慮相變、材料熱物性隨溫度變化條件下對(duì)選區(qū)激光熔化成形過程的三維瞬態(tài)溫度場進(jìn)行了數(shù)值模擬,利用參數(shù)化語言(APDL)實(shí)現(xiàn)了激光高斯熱源的移動(dòng)加載,分別建立了單層單道和多層多道的有限元模型并對(duì)其成形區(qū)域進(jìn)行預(yù)測(cè)�；跍囟葓龅挠�(jì)算結(jié)果,采用熱力耦合方法,建立了選區(qū)激光熔化過程應(yīng)力應(yīng)變場分析模型,分析了熱力演變規(guī)律和殘余應(yīng)力分布,為以后的實(shí)際加工提供依據(jù)。
[Abstract]:The study of functionally graded materials has rapidly become an active project at home and abroad. FGM is a new type of functional composite material, and its two sides are composed of materials of different properties. The composition and structure of the middle part continuously change with gradient, so that the properties and functions of the material also change gradient, which overcomes the mismatch factors of different materials. Selective Laser melting (SLM) is a new rapid prototyping technology developed in recent years. Its unique advantages make it one of the most promising rapid prototyping technologies. When two kinds of materials need to be formed at the same time in the process of forming, because different materials have different properties, the forming of the two kinds of materials has put forward special requirements to the test parameters and process parameters. In this paper, a method of fabricating heterogeneous material parts with SLM equipment is proposed, and its main executive mechanism is designed. Then the combination of two kinds of materials in SLM forming process is studied by computer numerical simulation. Using the method of material element attribute transformation and element birth and death technique, the three-dimensional transient temperature field of selective laser melting forming process is numerically simulated under the condition of considering phase change and the change of material thermal property with temperature. The moving loading of laser Gao Si heat source is realized by using parameterized language (APDL). The finite element models of single-channel and multi-channel single layer and multi-channel are established, respectively, and the forming region is predicted. Based on the calculation results of the temperature field, the stress and strain field analysis model of the laser melting process is established by using the coupled thermodynamic method, and the thermal evolution law and residual stress distribution are analyzed, which provides the basis for the practical processing in the future.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB34

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本文編號(hào)：1959741