本文關(guān)鍵詞：復(fù)合材料抗爆容器載荷規(guī)律及動力響應(yīng)研究　出處：《浙江大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 抗爆容器 復(fù)合材料 數(shù)值模擬 動力響應(yīng) 載荷規(guī)律

【摘要】：抗爆容器是一種工作在極端條件下的壓力容器,能夠限制內(nèi)部爆炸產(chǎn)物和爆炸沖擊波的作用范圍,對工程設(shè)備和試驗人員等起到近距離保護(hù)作用,方便對爆炸和爆轟過程進(jìn)行觀察和測試,以及回收試驗產(chǎn)物和防止環(huán)境污染等。隨著抗爆容器的大型化,目前廣泛使用的單層抗爆容器的固有缺點開始顯露出來,如制造困難、成本高、深厚焊縫難以檢測和消除等,難以滿足抗爆容器大當(dāng)量化的發(fā)展要求,而復(fù)合材料抗爆容器不但克服了以上的不足,而且具有抗疲勞、耐腐蝕、電絕緣性能好、比強(qiáng)度高及破損安全性等諸多優(yōu)點,因此研究新型復(fù)合材料抗爆容器來滿足抗爆容器大當(dāng)量化的要求具有十分重要的意義。 本文在國家自然科學(xué)基金“復(fù)合材料圓柱形容器在內(nèi)爆炸強(qiáng)動載荷作用下的損傷演化和壽命研究”(項目編號：50875236)和“抗爆容器絕熱剪切瞬態(tài)演化過程和斷裂形貌預(yù)測”(項目編號：51005201)的資助下,對復(fù)合材料抗爆容器內(nèi)部爆炸載荷規(guī)律及其動力響應(yīng)展開了數(shù)值研究,主要研究內(nèi)容和結(jié)論有： (1)復(fù)合材料抗爆容器建模。首先對復(fù)合材料的發(fā)展歷程以及復(fù)合材料抗爆容器的基本結(jié)構(gòu)進(jìn)行了簡要的介紹,并描述了復(fù)合材料抗爆容器的顯著優(yōu)點；其次研究討論了單層復(fù)合材料的基本強(qiáng)度理論和失效準(zhǔn)則,以及復(fù)合材料層合板的強(qiáng)度理論,并對比研究了幾種強(qiáng)度理論各自的適用范圍；最后分別對ANSYS和LS-DYNA程序中可用于復(fù)合材料建模的單元類型進(jìn)行了介紹,確定了本文采用的單元類型,并基于三個基本假設(shè)分別在ANSYS和LS-DYNA程序中建立了復(fù)合材料抗爆容器的數(shù)值計算模型。 (2)復(fù)合材料抗爆容器內(nèi)部爆炸載荷的研究。詳細(xì)描述了LS-DYNA計算程序中爆炸流場計算方法,基于該方法建立復(fù)合材料抗爆容器內(nèi)部爆炸載荷的流固耦合計算模型。利用建立的計算模型,數(shù)值計算了不同當(dāng)量等長徑比圓柱形TNT裝藥下復(fù)合材料抗爆容器內(nèi)部爆炸載荷特性和分布規(guī)律。數(shù)值計算結(jié)果表明：復(fù)合材料抗爆容器壁面爆炸載荷分布不均勻,爆炸載荷主要集中在爆心附近圓柱筒體上；爆心對應(yīng)圓柱壁面點為圓柱筒體上承受最大爆炸沖擊載荷的位置；并且發(fā)現(xiàn)在給定的結(jié)構(gòu)尺寸下,爆心環(huán)面比沖量與炸藥量成很好的線性關(guān)系。 (3)復(fù)合材料抗爆容器動力響應(yīng)研究。利用第二章建立的復(fù)合材料抗爆容器的數(shù)值計算模型,對不同藥量TNT作用下的復(fù)合材料圓柱殼進(jìn)行了動力響應(yīng)分析,發(fā)現(xiàn)纖維對稱纏繞方式可以較好的平衡環(huán)向變形和徑向變形,具有應(yīng)力均勻化效應(yīng),有利于材料性能的充分利用,這是復(fù)合材料爆炸容器優(yōu)于單層金屬爆炸容器的主要特性。研究發(fā)現(xiàn)復(fù)合材料圓柱結(jié)構(gòu)在振動后期出現(xiàn)了節(jié)拍現(xiàn)象,并通過模態(tài)分析初步解釋了出現(xiàn)節(jié)拍的原因。結(jié)構(gòu)的響應(yīng)雖然表現(xiàn)出明顯的節(jié)拍效應(yīng),但其振動始終維持在彈性范圍內(nèi),振動時間維持在100ms以上,這種振動特點有助于將容器吸收的爆轟能量轉(zhuǎn)換為結(jié)構(gòu)的動能,有助于提高結(jié)構(gòu)的抗爆能力。
[Abstract]:Explosion containment vessel is a pressure vessel working in extreme conditions, to limit the production of explosion and explosion shock wave range, on engineering equipment and testing personnel to close the protective effect, convenience of the explosion and detonation process were observed and measured, and the recycle of test products and prevent environmental pollution. With the large-scale anti explosion container, inherent shortcomings of the widely used single antiknocking container begin to expose, such as manufacturing difficulty, high cost, difficult to detect and eliminate the deep seam, it is difficult to meet the large explosion containment vessel when quantitative requirements of the development of composite materials resistant container not only overcome the above shortcomings, but also has anti fatigue corrosion resistance, good electrical insulation properties, damage the advantages of safety and high strength, so the research model of composite explosion containment vessel to meet the requirements of large antiknocking container equivalent out It's very important.
Based on the National Natural Science Foundation "composite cylindrical vessel, explosion dynamic damage evolution and life of the load" (project number: 50875236) and "anti explosion container adiabatic shear transient evolution process and fracture morphology prediction" (project number: 51005201) supported by the expansion of a numerical study on the response of the internal composite materials anti explosion container of explosion load and dynamic, main research contents and conclusion:
(1) composite explosion containment vessel modeling. Firstly the structure development of composite material and composite material antiknock container was introduced briefly, and describes the advantages of composite explosion containment vessel; secondly, discussed the basic theory of composite material strength and failure criteria, and strength theory of composite laminates, and comparative study of the applicability of several strength theories; finally the ANSYS and the LS-DYNA program can be used in the composite modeling element types are introduced, this paper uses the single element type is determined, and based on three basic assumptions respectively in ANSYS and LS-DYNA program was established in the numerical calculation of composite explosion containment vessel model.
(2) the research of composite explosion containment vessel internal blast loading. A detailed description of the calculation method of explosion field calculation program LS-DYNA, calculation model of solid coupling to establish the internal explosive loading of composite explosion containment vessel based on the method of flow. Using the established model, the numerical calculation of different equivalent length diameter ratio of cylindrical TNT loaded composite anti explosion container internal explosion load characteristics and distribution rules. The numerical results show that the composite explosion containment vessel wall explosion load distribution is not uniform, the explosion load mainly concentrated in the explosion near the center of cylinder body; blasting corresponding cylinder surface to withstand the maximum explosion loading position of cylinder body; and found in size the case of the blasting impulse and torus explosive quantity has a good linear relationship.
(3) dynamic response of composite explosion containment vessel. Using the numerical calculation model of the second chapter of composite explosion containment vessel, the composite cylindrical shell of different dosage of TNT on the condition of dynamic response analysis, found that the fiber symmetric winding can be a good way to balance the circumferential deformation and radial deformation, has uniform stress effect that is beneficial to making full use of the material properties, which is the main characteristic of composite is better than that of single metal explosion vessel explosion vessel. The study found that composite cylindrical structure appeared in the late beat phenomenon and vibration, through modal analysis preliminary explain the beat reasons. The response of the structure although there is obvious beating phenomenon, but its vibration always maintain in the elastic range, the vibration time maintained at more than 100ms, the vibration characteristics will help the detonation energy absorbed by the container into the structure Kinetic energy helps to improve the anti explosion ability of the structure.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH49

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