本文選題：固體力學(xué) + 夾芯板�。� 參考：《太原理工大學(xué)》2015年博士論文

【摘要】：泡沫鋁夾芯板結(jié)構(gòu)的特點(diǎn)是輕質(zhì)、高比剛度，并具有良好的沖擊波散射性能，被廣泛應(yīng)用于航空航天、軍用汽車、船舶制造以及核工業(yè)等領(lǐng)域。作為一種輕質(zhì)復(fù)合裝甲，不可避免地經(jīng)常遭受子彈及爆轟產(chǎn)物、破片的沖擊，只有清楚了解其抗侵徹性能，才可以使其充分發(fā)揮自身的防護(hù)能力。為了進(jìn)一步探討泡沫金屬夾芯板防護(hù)裝甲的抗侵徹性能，本文從實(shí)驗(yàn)研究、理論建模與數(shù)值模擬三個(gè)方面對(duì)不同彈頭的子彈撞擊作用下泡沫鋁夾芯板防護(hù)裝甲的動(dòng)態(tài)響應(yīng)問(wèn)題進(jìn)行了系統(tǒng)深入的研究，取得如下重要成果： 通過(guò)不同彈頭的子彈對(duì)泡沫鋁夾芯板的侵徹實(shí)驗(yàn)，研究了其在子彈撞擊下的變形模式和侵徹失效問(wèn)題，以及泡沫鋁夾芯板抗侵徹性能與彈頭形狀、芯層厚度及面板厚度等參數(shù)的關(guān)系。研究發(fā)現(xiàn)：侵徹所導(dǎo)致的變形和損傷主要集中在子彈頭部下方區(qū)域發(fā)生，而在徑向方向上幾乎沒(méi)有發(fā)生變形和損傷。增加芯層厚度或面板厚度均能有效提高泡沫鋁夾芯板的抗侵徹性能。夾芯板對(duì)平頭彈的抗侵徹性能最好，，對(duì)球頭彈的抗侵徹性能次之，對(duì)錐頭彈的抗侵徹性能最弱。 建立了泡沫金屬夾芯板厚靶在不同彈頭的子彈撞擊下的多階段侵徹動(dòng)力學(xué)理論模型，得到了侵徹阻力和瞬時(shí)速度等物理量的解析解。并在此基礎(chǔ)上研究了子彈幾何尺寸、芯層密度、子彈入射速度等參數(shù)與能量吸收的關(guān)系。同時(shí)應(yīng)用非線性結(jié)構(gòu)動(dòng)態(tài)響應(yīng)分析有限元程序?qū)ψ訌椙謴夭煌姘褰M合、不同尺寸的泡沫鋁夾芯板防護(hù)裝甲的全過(guò)程進(jìn)行了數(shù)值模擬，研究了其變形和失效過(guò)程，并探討分析了影響夾芯板抗侵徹性能和整體吸能特性的參數(shù)。結(jié)果表明：夾芯板的抗侵徹性能隨著芯層密度、芯層厚度的增加而增加，夾芯板的能量吸收也隨著子彈初始速度和直徑的增加而增加。夾芯板的抗侵徹性能和整體吸能特性不僅與面板材料的強(qiáng)度有關(guān)，也與不同強(qiáng)度材料的面板前后順序有關(guān)。 文中還對(duì)多層防護(hù)甲板的抗侵徹性能進(jìn)行了數(shù)值模擬研究，比較了不同數(shù)量、厚度、布置方式與層合方式的效果。研究表明：雙層靶板首層的厚度與靶板（除空氣層外）總厚度的比值等于0.5時(shí)，靶板的抗侵徹性能最弱，當(dāng)比值等于0.25時(shí)，靶板的抗侵徹性能最好。在三層靶板結(jié)構(gòu)中，首層的厚度越小，靶板的抗侵徹性能越好。
[Abstract]:The foam aluminum sandwich panel structure is characterized by light weight, high specific stiffness and good shock wave scattering performance. It is widely used in aerospace, military vehicles, shipbuilding and nuclear industry. As a kind of lightweight composite armor, it is unavoidable to be subjected to the impact of bullets and detonation products, and fragments. Only by clearly understanding its penetration resistance, can it give full play to its own protective ability. In order to further study the penetration resistance of metal foam sandwich panel armor, this paper presents an experimental study. Theoretical modeling and numerical simulation are used to study the dynamic response of aluminum foam sandwich plate armor under the impact of different warhead bullets systematically and deeply. The results are as follows: In this paper, the deformation mode and penetration failure of the foam aluminum sandwich panel under the impact of bullets are studied through the penetration experiments of the bullets with different warheads, as well as the penetration resistance performance and the warhead shape of the foam aluminum sandwich panel. The relationship between the thickness of the core layer and the thickness of the panel. It is found that the deformation and damage caused by penetration mainly occur in the area below the bullet head, but almost no deformation and damage occur in the radial direction. The penetration resistance of foamed aluminum sandwich panel can be improved by increasing the thickness of core layer or panel. The sandwich panel has the best penetration resistance to flat-end projectile, followed by spherical projectile, and the taper projectile has the weakest anti-penetration performance. A multi-stage penetration dynamics model for thick foamed metal sandwich plate targets under the impact of bullets with different warheads is established. The analytical solutions of penetration resistance and instantaneous velocity are obtained. On this basis, the relationship between the energy absorption and the parameters such as the size of the bullet, the density of the core layer and the incident velocity of the bullet is studied. At the same time, the finite element program of nonlinear structural dynamic response analysis is used to simulate the whole process of projectile penetration into different panel combinations and different sizes of aluminum foam sandwich panel armor, and the deformation and failure process of the armor are studied. The parameters that affect the penetration resistance and energy absorption of sandwich panels are discussed. The results show that the penetration resistance of sandwich panels increases with the increase of core density and core thickness, and the energy absorption of sandwich panels increases with the increase of initial velocity and diameter of bullets. The penetration resistance and overall energy absorption of sandwich panels are not only related to the strength of panel materials, but also related to the order of front and rear panels of different strength materials. Numerical simulation of the anti-penetration performance of multi-layer protective decks is also carried out, and the effects of different numbers, thickness, arrangement and lamination are compared. The results show that when the ratio of the thickness of the first layer of the double layer target to the total thickness of the target (except the air layer) is equal to 0.5, the penetration resistance of the target is the weakest. When the ratio is equal to 0.25, the penetration resistance of the target is the best. In the three-layer target structure, the smaller the thickness of the first layer, the better the penetration resistance of the target.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB383.4

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 馮陽(yáng);泡沫鋁夾芯板細(xì)觀結(jié)構(gòu)及抗侵徹能力研究[D];中北大學(xué);2016年

本文編號(hào)：1871973