本文選題：Z-pin　切入點(diǎn)：X-cor夾層結(jié)構(gòu)　出處：《南京航空航天大學(xué)》2017年碩士論文

【摘要】：X-cor夾層結(jié)構(gòu)是由Z-pin增強(qiáng)泡沫制備的一種新型復(fù)合材料夾層結(jié)構(gòu),本身具有豐富的可設(shè)計(jì)性,在航空航天、航海、列車等領(lǐng)域有著廣闊的應(yīng)用前景。目前國(guó)內(nèi)外對(duì)于X-cor夾層結(jié)構(gòu)抗沖擊性能的研究并不多。本文首先研究低速?zèng)_擊實(shí)驗(yàn)對(duì)X-cor夾層結(jié)構(gòu)的抗沖擊性能的影響,探索其損傷機(jī)理、Z-pin增強(qiáng)機(jī)制,并研究設(shè)計(jì)參數(shù)的影響規(guī)律;接著用有限元對(duì)X-cor夾層結(jié)構(gòu)低速?zèng)_擊以及沖擊后剩余壓縮強(qiáng)度進(jìn)行全程模擬;最后,對(duì)X-cor夾層結(jié)構(gòu)設(shè)計(jì)三因素三水平正交試驗(yàn)進(jìn)行高速?zèng)_擊,分析其彈道極限和損傷面積,得到在高速?zèng)_擊工況下最優(yōu)化的參數(shù)設(shè)計(jì)組合。低速?zèng)_擊實(shí)驗(yàn)中包括:1.低速落錘沖擊實(shí)驗(yàn),2.紅外無損檢測(cè)實(shí)驗(yàn),3.沖擊后剩余壓縮強(qiáng)度實(shí)驗(yàn)(CAI)。研究四種設(shè)計(jì)參數(shù):泡沫類型、Z-pin植入間距、Z-pin排列方向、Z-pin植入角度對(duì)X-cor夾層結(jié)構(gòu)抗沖擊性能的影響。實(shí)驗(yàn)表明:在高能量沖擊下,較弱的泡沫芯材反而吸能效果更好;在低沖擊能量范圍內(nèi),減小Z-pin植入間距能夠明顯降低沖擊分層損傷面積;就Z-pin排列方向而言,四向排列的Z-pin抗沖擊能力略優(yōu)于雙向排列的Z-pin;Z-pin植入的角度為22°時(shí)X-cor夾層結(jié)構(gòu)的抗沖擊性能最好。應(yīng)用商業(yè)有限元軟件ABAQUS建立了X-cor夾層結(jié)構(gòu)的低速?zèng)_擊模型,引入Crushable Foam泡沫彈塑性本構(gòu)模擬泡沫夾芯,采用非線性梁?jiǎn)卧獙?duì)Z-pin進(jìn)行模擬,結(jié)合二維Hashin準(zhǔn)則建立了復(fù)合材料面板粘彈性損傷本構(gòu)模型。將沖擊后的結(jié)果通過數(shù)值傳遞直接用于剩余壓縮強(qiáng)度的計(jì)算,實(shí)現(xiàn)低速?zèng)_擊到剩余壓縮強(qiáng)度的全程模擬。模擬結(jié)果表明:沖擊模擬得到的分層面積大小相比試驗(yàn)結(jié)果較為接近,誤差不超過10%;在高能量沖擊下,泡沫吸能在沖擊能量的吸收中貢獻(xiàn)最大;剩余壓縮強(qiáng)度模擬中,側(cè)壓峰值力模擬值比試驗(yàn)值偏高。通過三因素(面板厚度、泡沫類型、Z-pin植入間距)三水平正交實(shí)驗(yàn)探究X-cor夾層結(jié)構(gòu)在高速?zèng)_擊下的最佳設(shè)計(jì)參數(shù),分析其失效機(jī)理,結(jié)果表明:X-cor夾層結(jié)構(gòu)面板的厚度對(duì)高速?zèng)_擊的彈道極限的影響最大,厚度越大彈道極限越大,但不可避免的會(huì)帶來重量增加;其次是Z-pin植入密度對(duì)其彈道極限的影響,Z-pin植入間距最佳設(shè)計(jì)應(yīng)不大于沖擊物沖頭半徑;增加泡沫密度對(duì)彈道極限影響較小;在三個(gè)因素中,Z-pin植入間距對(duì)X-cor夾層結(jié)構(gòu)損傷面積的減小影響最大,因此綜合考慮,最佳設(shè)計(jì)水平采用面板厚度2mm、泡沫類型為71IG、Z-pin植入間距為5×5mm。
[Abstract]:X-cor sandwich structure is a new type of composite sandwich structure prepared from Z-pin reinforced foam. At present, there are few researches on the impact resistance of X-cor sandwich structure in China and abroad. First of all, the impact of low speed impact test on the impact performance of X-cor sandwich structure is studied in this paper. To explore its damage mechanism and Z-pin enhancement mechanism, and to study the influence of design parameters; then to simulate the low speed impact and residual compressive strength of X-cor sandwich structure by finite element method. Finally, The design of X-cor sandwich structure with three factors and three levels of orthogonal test was carried out at high speed, and its ballistic limit and damage area were analyzed. The optimal parameter design combination under high speed impact condition is obtained. The low speed impact experiment includes 1: 1. Low speed drop hammer impact experiment 2. Infrared nondestructive testing experiment 3. The residual compression strength after impact test is studied. Four design parameters are studied. The effect of Z-pin placement angle on the impact resistance of X-cor sandwich structure under high energy impact is studied. In the low impact energy range, decreasing the spacing of Z-pin implantation can significantly reduce the impact delamination damage area. For the direction of Z-pin arrangement, The impact resistance of four-direction Z-pin is slightly better than that of bi-directional Z-pinn Z-pin implantation with 22 擄angle. The low speed impact model of X-cor sandwich structure is established by commercial finite element software ABAQUS, and the impact resistance of X-cor sandwich structure is better when the angle is 22 擄. The Crushable Foam foam elastoplastic constitutive model is introduced to simulate the foam sandwich core, and the nonlinear beam element is used to simulate the Z-pin. The viscoelastic damage constitutive model of composite panel is established by using two-dimensional Hashin criterion. The results after impact are directly used to calculate the residual compressive strength by numerical transfer. The simulation results show that the stratified area obtained by the impact simulation is close to the experimental results, and the error is not more than 10. In the simulation of residual compression strength, the simulated value of peak lateral pressure force is higher than the experimental value. The optimum design parameters of X-cor sandwich structure under high speed impact were investigated by three-level orthogonal experiment. The failure mechanism was analyzed. The results show that the thickness of the panel of the sandwich structure has the greatest influence on the ballistic limit of high velocity impact. The greater the thickness, the greater the ballistic limit, but it will inevitably bring about an increase in weight, secondly, the influence of Z-pin implantation density on its ballistic limit. The optimum design of Z-pin insertion spacing should not be greater than the impact impact radius. Increasing foam density has little effect on ballistic limit, and Z-pin implantation spacing has the greatest effect on the reduction of damage area of X-cor sandwich structure. Therefore, considering the optimum design level, the thickness of panel is 2mm, the foam type is 71IGZpin implantation distance is 5 脳 5mm.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB33

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