本文選題：數(shù)值模擬 + 單層鋼化玻璃��； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：隨著國(guó)民經(jīng)濟(jì)快速的發(fā)展,單層鋼化玻璃依靠其優(yōu)異的性能在現(xiàn)代化都市建筑和交通等領(lǐng)域得到了廣泛的應(yīng)用。但是,單層鋼化玻璃作為一種脆性材料,在沖擊波作用下易于破壞,并且破壞后會(huì)帶來(lái)人員傷亡和財(cái)物損失。因此,研究沖擊波作用下單層鋼化玻璃毀傷效應(yīng)具有廣泛的應(yīng)用前景,如意外爆炸、事故爆炸、恐怖襲擊等爆炸事件的毀傷評(píng)估以及結(jié)構(gòu)防護(hù)分析和抗爆設(shè)計(jì)等都需要此研究作為參考。目前對(duì)沖擊波作用下單層鋼化玻璃毀傷效應(yīng)的研究已成為國(guó)內(nèi)外學(xué)者關(guān)注的一個(gè)重要課題,近年來(lái)用試驗(yàn)方法、數(shù)值模擬方法和解析方法已經(jīng)取得了一些成果,其中對(duì)夾層玻璃的研究相對(duì)較多,對(duì)單層鋼化玻璃的研究還很少,還沒(méi)有學(xué)者對(duì)單層鋼化玻璃在沖擊波作用下毀傷的P-I曲線進(jìn)行過(guò)研究。本文借助數(shù)值模擬方法和試驗(yàn)方法,對(duì)單層鋼化玻璃在沖擊波載荷作用下的毀傷效應(yīng)進(jìn)行了數(shù)值模擬和外場(chǎng)實(shí)驗(yàn)研究。主要開(kāi)展了如下工作:1)項(xiàng)目組進(jìn)行了一系列外場(chǎng)實(shí)驗(yàn)來(lái)研究沖擊波對(duì)單層鋼化玻璃的毀傷效應(yīng)。本次試驗(yàn)采用直接引爆TNT炸藥產(chǎn)生沖擊波,作用在已固定好的單層鋼化玻璃板上。通過(guò)對(duì)同一規(guī)格的單層鋼化玻璃板進(jìn)行多次試驗(yàn),將實(shí)驗(yàn)測(cè)得的沖擊波參數(shù)和碎片進(jìn)行分析討論,得到了單層鋼化玻璃在受到?jīng)_擊波載荷作用下破碎的超壓沖量閾值。為本文的數(shù)值模擬研究奠定了實(shí)驗(yàn)對(duì)比的基礎(chǔ)。2)建立了一套完整的沖擊波作用下單層鋼化玻璃毀傷效應(yīng)的數(shù)值模擬模型。包括對(duì)單層鋼化玻璃板采用Lagrange方法描述,對(duì)場(chǎng)地實(shí)驗(yàn)測(cè)得超壓載荷進(jìn)行簡(jiǎn)化、對(duì)鋼化玻璃板模型邊界條件的設(shè)定以及單層鋼化玻璃本構(gòu)和破壞準(zhǔn)則的選取。通過(guò)對(duì)計(jì)算機(jī)計(jì)算時(shí)間和計(jì)算結(jié)果精度的綜合考慮,對(duì)單層鋼化玻璃板單元網(wǎng)格尺寸的敏感性進(jìn)行了驗(yàn)證,重點(diǎn)利用場(chǎng)地實(shí)驗(yàn)和數(shù)值模擬對(duì)單層鋼化玻璃板破壞的應(yīng)變閾值進(jìn)行了研究。3)借助場(chǎng)地實(shí)驗(yàn)結(jié)果和文獻(xiàn)中實(shí)驗(yàn)結(jié)果對(duì)建立的沖擊波作用下單層鋼化玻璃毀傷效應(yīng)的數(shù)值模型的合理性進(jìn)行了驗(yàn)證。對(duì)場(chǎng)地實(shí)驗(yàn)結(jié)果進(jìn)行歸納和分析,通過(guò)已建立的數(shù)值模型計(jì)算了與場(chǎng)地實(shí)驗(yàn)每發(fā)試驗(yàn)相對(duì)應(yīng)的超壓沖量組合,把計(jì)算得到的單層鋼化玻璃位移云圖及破壞情況與場(chǎng)地實(shí)驗(yàn)進(jìn)行比對(duì),二者吻合較好,驗(yàn)證了所建立的數(shù)值模型的合理性。4)利用建立的數(shù)值模型對(duì)沖擊波作用下單層鋼化玻璃的毀傷效應(yīng)開(kāi)展了規(guī)律性研究。通過(guò)已驗(yàn)證的數(shù)值模型進(jìn)行大量的計(jì)算,得到了一系列沖擊波作用下單層鋼化玻璃破壞的臨界超壓沖量閾值,進(jìn)一步,對(duì)計(jì)算所得的數(shù)據(jù)點(diǎn)進(jìn)行曲線擬合,得到了沖擊波作用下單層鋼化玻璃毀傷的P-I曲線及經(jīng)驗(yàn)公式。最后分別研究了在超壓一定時(shí)和沖量一定時(shí),單層鋼化玻璃在沖擊波作用下的損傷特征和規(guī)律,并且對(duì)鋼化玻璃破碎后的碎片速度進(jìn)行了分析。
[Abstract]:With the rapid development of national economy, single-layer toughened glass has been widely used in modern urban buildings and transportation fields.However, as a brittle material, single layer toughened glass is easy to be destroyed under shock wave, and will cause casualties and property losses.Therefore, the study of damage effect of single layer toughened glass under shock wave has a wide application prospect, such as accidental explosion, accidental explosion,The damage assessment, structural protection analysis and anti-explosion design of terrorist attacks and other explosions need this research as a reference.At present, the research on the damage effect of single layer toughened glass under shock wave has become an important subject that scholars at home and abroad have paid close attention to. In recent years, some achievements have been obtained by using experimental method, numerical simulation method and analytical method.There are many researches on laminated glass, few on single layer toughened glass, and no research on P-I curve of single layer toughened glass damaged by shock wave.In this paper, the damage effect of single layer toughened glass under shock wave loading is studied by numerical simulation and experiment.A series of field experiments were carried out to study the damage effect of shock wave on single layer toughened glass.Shock wave was produced by direct detonation of TNT explosive, which acted on the fixed single-layer toughened glass plate.The shock wave parameters and fragments of the single layer toughened glass plate of the same size were analyzed and discussed, and the overpressure impulse threshold of the single layer tempered glass was obtained under the action of shock wave load.A complete set of numerical simulation model of damage effect of single layer tempered glass under shock wave is established.The method of Lagrange is used to describe the single layer toughened glass plate, the overpressure load measured in the site experiment is simplified, the boundary condition of the model and the constitutive structure and failure criterion of the single layer tempered glass plate are set.The sensitivity of single layer toughened glass plate cell mesh size is verified by considering the computing time and accuracy of the computer.The strain threshold of single layer toughened glass plate was studied by site experiment and numerical simulation. 3) the damage effect of single layer tempered glass under shock wave was studied by site experiment and experimental results in literature.The rationality of the numerical model is verified.The results of site experiments are summarized and analyzed, and the overpressure impulse combinations corresponding to each test are calculated through the established numerical model.The calculated displacement cloud diagram and failure of single layer toughened glass are compared with the site experiment, and the results are in good agreement with each other.The rationality of the established numerical model is verified. 4) the damage effect of single layer toughened glass under shock wave is studied regularly by using the established numerical model.The critical overpressure impulse threshold of a series of shock waves is obtained by a large number of verified numerical models. Furthermore, the calculated data points are fitted by curve.The P-I curve and empirical formula of single layer toughened glass damaged by shock wave are obtained.Finally, the damage characteristics and rules of single layer toughened glass under shock wave are studied at the same time of overpressure and constant impulse, and the debris velocity after breaking of toughened glass is analyzed.
【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】：2017
【分類(lèi)號(hào)】：TQ171.732

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