本文選題：復(fù)合材料　切入點(diǎn)：加筋壁板　出處：《西北工業(yè)大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：先進(jìn)復(fù)合材料結(jié)構(gòu)因其比強(qiáng)度和比剛度高、性能可設(shè)計(jì)性等特點(diǎn)，可以滿足現(xiàn)代飛行器結(jié)構(gòu)多功能一體化設(shè)計(jì)需求，，于是廣泛地應(yīng)用于航空航天領(lǐng)域，尤其是先進(jìn)飛機(jī)結(jié)構(gòu)設(shè)計(jì)領(lǐng)域。但是，相比傳統(tǒng)的金屬材料，復(fù)合材料導(dǎo)電能力差且各向異性，從而導(dǎo)致復(fù)合材料飛機(jī)結(jié)構(gòu)電磁屏蔽性能的缺失，使得飛機(jī)對(duì)雷電環(huán)境更敏感且容易因雷擊事件而發(fā)生災(zāi)難性破壞。雷電可以給飛機(jī)結(jié)構(gòu)帶來(lái)直接效應(yīng)和間接效應(yīng)兩個(gè)方面影響，論文主要針對(duì)復(fù)合材料雷擊直接效應(yīng)問(wèn)題開展如下幾個(gè)方面研究： 1.針對(duì)典型飛機(jī)復(fù)合材料加筋壁板開展雷擊試驗(yàn)；對(duì)雷電流通道與復(fù)合材料加筋壁板間的相互作用過(guò)程進(jìn)行定性分析，將復(fù)合材料加筋壁板表面雷擊損傷區(qū)域分解成五個(gè)區(qū)域，分別是：初始附著區(qū)、附著傳導(dǎo)區(qū)、附著擴(kuò)展區(qū)、二次附著區(qū)和掃掠損傷區(qū)；對(duì)不同厚度局部噴鋁、全噴鋁、銅網(wǎng)以及未防護(hù)等四類防護(hù)形式的六件復(fù)合材料加筋壁板試驗(yàn)件的表面雷擊損傷區(qū)域分區(qū)特性進(jìn)行了詳細(xì)分析。 2.針對(duì)復(fù)合材料結(jié)構(gòu)遭受雷擊過(guò)程的物理環(huán)境尤其是電磁環(huán)境進(jìn)行了理論分析和數(shù)值模擬。將復(fù)合材料加筋壁板處理成復(fù)合材料層合板結(jié)構(gòu)，建立了三維雷電環(huán)境下復(fù)合材料層合板結(jié)構(gòu)電磁場(chǎng)有限元分析模型，計(jì)算了雙指數(shù)雷電流波形電磁場(chǎng)。有限元計(jì)算結(jié)果與理論吻合較好，同時(shí)，與復(fù)雜的電磁場(chǎng)理論相比較，有限元結(jié)果更直觀地反映了復(fù)合材料層合板結(jié)構(gòu)電磁場(chǎng)分布特性和放電通道對(duì)結(jié)構(gòu)電磁場(chǎng)的影響。 3.開展了雷電環(huán)境下電磁力對(duì)復(fù)合材料層合板結(jié)構(gòu)響應(yīng)的影響分析。比較了僅考慮板載雷電流電磁場(chǎng)和考慮放電通道電磁場(chǎng)兩種情況下電磁力引起的層合板應(yīng)力場(chǎng)和位移場(chǎng)；計(jì)算了不考慮電磁力情況下焦耳熱效應(yīng)導(dǎo)致復(fù)合材料熱膨脹從而引起層合板的應(yīng)力場(chǎng)和位移場(chǎng)，并將其與計(jì)及電磁力和焦耳熱效應(yīng)兩個(gè)物理量引起層合板的應(yīng)力和位移進(jìn)行了對(duì)比；發(fā)現(xiàn)可以忽略雷電環(huán)境下電磁力對(duì)復(fù)合材料結(jié)構(gòu)響應(yīng)的影響。 4.基于復(fù)合材料彈性本構(gòu)模型及其彈塑性失效模型和高爆炸藥材料模型建立了雷電環(huán)境下復(fù)合材料非線性動(dòng)力學(xué)模型；構(gòu)建了基于電-熱耦合分析和汽化反沖分析的綜合分析方法，對(duì)雷電流直接效應(yīng)引起的復(fù)合材料層合板動(dòng)態(tài)損傷行為進(jìn)行了分析。從復(fù)合材料雷擊損傷定性分析角度來(lái)看，綜合分析結(jié)果與雷擊試驗(yàn)結(jié)果吻合較好，表明所建立的非線性動(dòng)力學(xué)模型和綜合分析方法可以用于雷擊引起的復(fù)合材料汽化反沖分析。 5.基于Hashin準(zhǔn)則和粘性正則化方法編譯了復(fù)合材料三維漸進(jìn)損傷子程序，采用全程分析方法對(duì)典型復(fù)合材料加筋壁板雷擊后的軸向壓縮穩(wěn)定性及其剩余強(qiáng)度進(jìn)行了數(shù)值計(jì)算。數(shù)值方法得到的含雷擊損傷加筋壁板失穩(wěn)情況和剩余強(qiáng)度與試驗(yàn)結(jié)果間誤差較小，但因未考慮內(nèi)部損傷致使軸向壓縮剛度數(shù)值結(jié)果與試驗(yàn)結(jié)果相差較大。
[Abstract]:Advanced composite structure because of its high specific strength and stiffness properties, design flexibility, can meet the requirements of modern aircraft structure integration design requirements, and is widely applied in the aerospace field, especially the advanced field of aircraft structural design. However, compared to traditional metal materials, composite materials and anisotropic conductivity specifically, resulting in lack of the electromagnetic shielding properties of the composite aircraft, the aircraft on the lightning environment more sensitive and easily due to lightning events and catastrophic damage. Lightning can bring two direct effect and indirect effect to the aircraft structure, the main work of the following for the composite effect of direct lightning:
1. for the typical aircraft composite stiffened panel to carry out the lightning test; qualitative analysis of the interaction of the lightning current channel and the composite stiffened panel between the process, the composite stiffened panel surface lightning damage region was divided into five regions, namely: initial attachment, attachment transmission area, attached to the expansion area, two time attachment region and sweep the damage zone of different thickness; local spraying of aluminum, copper and aluminum spray, net without protection four kinds of protection form six pieces of composite stiffened panel test piece surface lightning damage zone characteristics were analyzed in detail.
2. according to the physical environment of composite structures subjected to lightning process especially the electromagnetic environment of the theoretical analysis and numerical simulation. The composite stiffened panel with composite laminate structure, a composite laminate structure finite element analysis model under 3D environment of lightning, the double exponential waveform of lightning current electromagnetic field calculation. Co. The results are accord with the theory, at the same time, compared with the electromagnetic theory of complex, finite element results more directly reflect the influence of composite laminated structure and electromagnetic field distribution characteristics of discharge channel structure of the electromagnetic field.
3. to carry out the analysis of electromagnetic force lightning environment influence on composite laminates. The response was compared only considering the onboard lightning current electromagnetic field and electromagnetic force field considering the discharge channel two cases caused by laminate stress and displacement field; electromagnetic force without considering the effect of Joule heat conditions lead to composite materials due to expansion of laminated stress field and displacement field are calculated, and the gauge and electromagnetic force and Joule heat effect of two physical quantities by comparing the stress and displacement of laminates were found; electromagnetic force can be neglected under the environment of lightning composite material structural response.
4. elastic composite materials based on elastoplastic constitutive model and failure model and high explosive materials model established a composite nonlinear dynamics model of lightning environment; construct the comprehensive analysis method of electro thermal coupling analysis analysis and gasifying based on composite laminates dynamic damage behavior of direct effect should be caused by the lightning current the analysis from the qualitative analysis of composite lightning damage point of view, the comprehensive analysis results are in good agreement with the lightning test results, analysis of the composite shows that the nonlinear dynamics model of gasifying and comprehensive analysis of the established method can be used for lightning caused.
5. the Hashin criterion and the viscous regularization method based on the compilation of the composite 3D progressive damage subroutine of axial typical composite stiffened panel after lightning compression and residual strength stability has been calculated using the whole analysis method. The numerical method with lightning damage stiffened wall instability and the residual strength and the error between the test results small, but because of not considering the internal damage resulting in axial compression stiffness numerical results and the experimental results are quite different.

【學(xué)位授予單位】：西北工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB33

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本文編號(hào)：1639410