發(fā)布時(shí)間：2018-01-21 00:42

  本文關(guān)鍵詞： 爆炸力學(xué) 動(dòng)態(tài)響應(yīng) 鋁蜂窩夾芯板 吸能 結(jié)構(gòu)優(yōu)化 AUTODYN　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：鋁蜂窩夾芯板由于質(zhì)量輕、隔音、抗爆和吸能效果好等優(yōu)良特性,逐漸在航空、車輛、船舶等領(lǐng)域得到廣泛應(yīng)用。為了更好地了解鋁蜂窩板的抗爆性能以及吸能特性,為相應(yīng)結(jié)構(gòu)的優(yōu)化設(shè)計(jì)提供理論參考以及技術(shù)支持,本文主要采用數(shù)值計(jì)算方法,模擬外部爆炸沖擊載荷對(duì)鋁蜂窩夾芯板的作用,研究其在沖擊作用下結(jié)構(gòu)的動(dòng)態(tài)響應(yīng)、失穩(wěn)變形、吸能特性以及結(jié)構(gòu)安全的優(yōu)化。通過運(yùn)用非線性顯示動(dòng)力學(xué)軟件AUTODYN,建立、完善了鋁蜂窩夾芯板的三維計(jì)算模型;在不同炸藥裝藥條件下,數(shù)值計(jì)算鋁蜂窩夾芯板的各參數(shù)變化(包括改變前后面板厚度、夾芯層壁厚、高度以及胞元結(jié)構(gòu)等),并對(duì)夾芯板的抵抗爆炸沖擊載荷能力以及變形過程中塑性能的吸收特性進(jìn)行了研究,最后給出了較為具體的結(jié)構(gòu)防護(hù)優(yōu)化方案。研究結(jié)果表明:鋁蜂窩夾芯板受到爆炸沖擊載荷作用時(shí),因"慣性效應(yīng)",其結(jié)構(gòu)響應(yīng)滿足夾芯板變形的三階段理論;應(yīng)變率不敏感性基體材料構(gòu)成的鋁蜂窩夾芯板各結(jié)構(gòu)參數(shù)的增加,其抵抗沖擊載荷的能力增強(qiáng)與其平臺(tái)壓潰應(yīng)力的增加相一致;在吸能特性方面,在不同藥量的爆炸載荷沖擊作用下,鋁蜂窩夾芯板表現(xiàn)出較寬的吸能區(qū)間以及穩(wěn)定吸能特性;另外,結(jié)構(gòu)的抗沖擊強(qiáng)度降低時(shí),吸能的觸發(fā)的閾值也降低,同一載荷下其吸能效果增加;在結(jié)構(gòu)安全防護(hù)的優(yōu)化方面,多層鋁蜂窩夾芯板與單層鋁蜂窩夾芯板相比,其抗沖擊能力更優(yōu),但臨界塑性能量吸收差異不大;此外,臨界變形情況下,弧形結(jié)構(gòu)的鋁蜂窩板其抗爆性能和吸收塑性能量的能力均優(yōu)于平板鋁蜂窩夾芯板。
[Abstract]:Aluminum honeycomb sandwich panels, due to light weight, sound insulation, anti-explosion and good energy absorption effect and other excellent characteristics, gradually in the aviation, vehicles. Ships and other fields have been widely used. In order to better understand the anti-explosion performance and energy absorption characteristics of aluminum honeycomb plates, it provides theoretical reference and technical support for the optimization design of corresponding structures. In this paper, the numerical calculation method is used to simulate the effect of external explosion shock load on aluminum honeycomb sandwich panel, and to study the dynamic response and instability deformation of the structure under the impact action. Optimization of energy absorption characteristics and structural safety. The three-dimensional calculation model of aluminum honeycomb sandwich panel is established by using nonlinear display dynamics software AUTODYN. The parameters of aluminum honeycomb sandwich panel were calculated numerically under different explosive charge conditions (including changing the thickness of front and rear panel, wall thickness of sandwich layer, height and cell structure, etc.). The resistance of sandwich panels to blast impact loads and the absorption characteristics of plastic properties during deformation are also studied. The results show that the aluminum honeycomb sandwich panel is affected by the blast shock load because of "inertia effect". The structure response satisfies the three-stage theory of sandwich panel deformation. The increase of structural parameters of aluminum honeycomb sandwich panel made of insensitive matrix material at strain rate is consistent with the increase of platform crashing stress. In the aspect of energy absorption characteristics, aluminum honeycomb sandwich panels exhibit wide energy absorption range and stable energy absorption characteristics under the impact of different explosive loads. In addition, when the impact strength of the structure decreases, the threshold of energy absorption trigger also decreases, and the energy absorption effect increases under the same load. In the aspect of structural safety protection, the multi-layer aluminum honeycomb sandwich board has better impact resistance than single-layer aluminum honeycomb sandwich panel, but the critical plastic energy absorption is not different. In addition, under the critical deformation condition, the anti-explosion performance and the ability of absorbing plastic energy of the aluminum honeycomb plate with arc structure are better than those of the flat aluminum honeycomb sandwich plate.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB383.4;U260.2

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