【摘要】：防護工程的好壞對我國國防及人防安全具有重要意義。防護門作為防護工程的核心部件,其性能直接影響防護工程的防護等級。防護門抗沖擊性能主要是描述防護門抵抗爆炸沖擊波的能力,它是評價防護門性能的關鍵指標。因此防護門抗沖擊性能是研究防護門的重點。常規(guī)防護門分為鋼質防護門及鋼筋混凝土防護門兩種類型。常規(guī)防護門由于材料及抗力設計需要,門體比較笨重,具有開啟及維護困難、搶修搶建困難、運輸及安裝不便等問題。隨著新武器的發(fā)展,對新型防護門的研究勢在必行。理想的防護門材料應具備輕質高強、成本低、工藝性好等特點。碳纖維復合材料具有以上特點,在防護門應用上具有廣泛的前景。本文對碳纖維復合材料防護門進行了結構設計及性能評估,并對碳纖維復合材料鋪層參數的設計進行了一定的研究。本文運用爆炸沖擊波傳播理論,分析了四周固支狀態(tài)下的層合板響應特性,并提出了碳纖維復合材料防護門評價指標。碳纖維復合材料防護門是一種新型的防護門,具有碳纖維復合材料特性,并且滿足防護門的使用要求。結合常規(guī)防護門的評價指標及碳纖維復合材料評價指標,確定了碳纖維復合材料防護門評價指標,即采用碳纖維復合材料初始層失效原則,以最大應力準則為基準,并結合碳纖維復合材料防護門跨中位移值,作為碳纖維復合材料防護門抗沖擊性能評價指標。首先對碳纖維復合材料阻尼特性進行了測定,得出了給定結構及鋪層條件下的碳纖維復合材料防護板的瑞利阻尼系數,其中瑞利阻尼系數??6,-6??10×5.1;根據防護門使用條件,在LS-DYNA軟件中建立了防護門爆炸沖擊波載荷模型,分析在給定條件下防護門動態(tài)載荷。該載荷為三角形載荷,作用時間11ms,峰值為2.5×105Pa。然后根據測定的瑞利阻尼系數及防護門動態(tài)載荷,分析了鋪層參數對碳纖維復合材料防護板的影響。分析表明:以最大應力準則為基準,碳纖維復合材料防護門的鋪層以0°比例最多時沖擊性能好,其最優(yōu)鋪層為[0°4/45°/0°4/-45°/0°4/45°/0°4/-45°]s;本文對碳纖維復合材料防護門結構進行了設計分析。分析表明:1)防護板弧度為0°時,即防護板為平板,受力效果最好;2)當鋼質蒙皮厚度為1×103m時,能夠抵抗彈片的沖擊;3)當骨架數為18時,防護門在重量和最大應力兩個指標取得最優(yōu)。本文根據給定爆炸載荷,分析了該載荷下防護門失效情況。在等效靜載為3×105Pa的作用下,碳纖維復合材料防護門最大應力為2.14×108Pa,最大位移為7.488×103m。增大施加在防護門上的載荷,當等效靜載為3×106Pa時,最大應力為2×109Pa,最大位移為5.222×102m,碳纖維復合材料防護門失效,該碳纖維復合材料防護門抵抗靜載能力為3×106Pa,對應的抗動載能量為2.5×106Pa,即該碳纖維復合材料防護門的抗力為2.5×106Pa,能夠滿足防護要求。
[Abstract]:The quality of protective engineering is of great significance to our national defense and civil air defense safety. As the core component of the protective engineering, the performance of the protective door directly affects the protection grade of the protective engineering. The impact resistance of the protective door is mainly described as the ability of the door to resist the explosion shock wave, and it is the key index to evaluate the performance of the protective door. Therefore, the impact resistance of the protective door is the focus of the study of the protection door. Conventional doors are divided into steel doors and reinforced concrete doors. Because of the need of material and resistance design, the conventional protective door is bulky, difficult to open and maintain, difficult to rush repair and construction, and inconvenient to transport and install. With the development of new weapon, it is imperative to study the new protective door. The ideal protective door material should have the characteristics of light, high strength, low cost and good technology. Carbon fiber composite has the above characteristics and has a wide prospect in the application of protective doors. In this paper, the structure design and performance evaluation of the carbon fiber composite protective door are carried out, and the design of the coating parameters of the carbon fiber composite is studied. Based on the theory of explosion shock wave propagation, the response characteristics of laminated plates under the condition of clamping around are analyzed, and the evaluation indexes of carbon fiber composite protective doors are proposed. Carbon fiber composite protective door is a new type of protective door with carbon fiber composite material characteristics and meets the requirements of the application of the door. Combined with the evaluation index of the conventional protection door and the evaluation index of the carbon fiber composite material, the evaluation index of the carbon fiber composite protection door is determined, that is, the failure principle of the initial layer of the carbon fiber composite is adopted, and the maximum stress criterion is taken as the benchmark. Combined with the mid-span displacement value of the carbon fiber composite protection door, it can be used as the evaluation index of the impact resistance of the carbon fiber composite protection door. Firstly, the damping characteristics of carbon fiber composites are measured, and the Rayleigh damping coefficients of carbon fiber composite protective panels under given structure and layer conditions are obtained, in which the Rayleigh damping coefficient-6? According to the operating condition of the protective door, the blast shock wave load model of the protective door is established in the LS-DYNA software, and the dynamic load of the protective door is analyzed under the given conditions. The load is triangular, the action time is 11 Ms, and the peak value is 2.5 脳 105 Pa. According to the Rayleigh damping coefficient and the dynamic load of the protective door, the influence of the coating parameters on the carbon fiber composite protective plate is analyzed. The results show that, based on the criterion of maximum stress, the impact performance of the protective door layer of carbon fiber composite is good when the ratio of 0 擄to 0 擄is the highest, and the optimum layer is [0 擄4 / 45 擄/ 0 擄4 / -45 擄/ 0 擄4 / 45 擄/ 0 擄4 / -45 擄] s; In this paper, the structure of carbon fiber composite protective door is designed and analyzed. The analysis shows that: 1) when the arc of the protective plate is 0 擄, that is, the plate is the plate, the stress effect is the best, 2) when the thickness of the steel skin is 1 脳 10 3m, it can resist the impact of the shrapnel. 3) when the skeleton number is 18:00, the optimum weight and maximum stress are obtained. According to the given explosion load, the failure of the protective door under the load is analyzed in this paper. Under the equivalent static load of 3 脳 105Pa, the maximum stress and displacement of the carbon fiber composite protective door are 2.14 脳 10 ~ 8 Pa and 7.488 脳 10 ~ 3 m respectively. When the equivalent static load is 3 脳 10 ~ (9) Pa, the maximum stress is 2 脳 10 ~ (9) Paa and the maximum displacement is 5.222 脳 10 ~ (2) m. The corresponding dynamic load resistance energy is 2.5 脳 106 Pa. that is, the resistance of the CFRP protective door is 2.5 脳 106 Pa. it can meet the requirements of protection.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB332

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