碳纤维复合材料防护门抗冲击性能研究

发布时间：2019-02-17 08:22

【摘要】：防护工程的好坏对我国国防及人防安全具有重要意义。防护门作为防护工程的核心部件,其性能直接影响防护工程的防护等级。防护门抗冲击性能主要是描述防护门抵抗爆炸冲击波的能力,它是评价防护门性能的关键指标。因此防护门抗冲击性能是研究防护门的重点。常规防护门分为钢质防护门及钢筋混凝土防护门两种类型。常规防护门由于材料及抗力设计需要,门体比较笨重,具有开启及维护困难、抢修抢建困难、运输及安装不便等问题。随着新武器的发展,对新型防护门的研究势在必行。理想的防护门材料应具备轻质高强、成本低、工艺性好等特点。碳纤维复合材料具有以上特点,在防护门应用上具有广泛的前景。本文对碳纤维复合材料防护门进行了结构设计及性能评估,并对碳纤维复合材料铺层参数的设计进行了一定的研究。本文运用爆炸冲击波传播理论,分析了四周固支状态下的层合板响应特性,并提出了碳纤维复合材料防护门评价指标。碳纤维复合材料防护门是一种新型的防护门,具有碳纤维复合材料特性,并且满足防护门的使用要求。结合常规防护门的评价指标及碳纤维复合材料评价指标,确定了碳纤维复合材料防护门评价指标,即采用碳纤维复合材料初始层失效原则,以最大应力准则为基准,并结合碳纤维复合材料防护门跨中位移值,作为碳纤维复合材料防护门抗冲击性能评价指标。首先对碳纤维复合材料阻尼特性进行了测定,得出了给定结构及铺层条件下的碳纤维复合材料防护板的瑞利阻尼系数,其中瑞利阻尼系数??6,-6??10×5.1;根据防护门使用条件,在LS-DYNA软件中建立了防护门爆炸冲击波载荷模型,分析在给定条件下防护门动态载荷。该载荷为三角形载荷,作用时间11ms,峰值为2.5×105Pa。然后根据测定的瑞利阻尼系数及防护门动态载荷,分析了铺层参数对碳纤维复合材料防护板的影响。分析表明:以最大应力准则为基准,碳纤维复合材料防护门的铺层以0°比例最多时冲击性能好,其最优铺层为[0°4/45°/0°4/-45°/0°4/45°/0°4/-45°]s;本文对碳纤维复合材料防护门结构进行了设计分析。分析表明:1)防护板弧度为0°时,即防护板为平板,受力效果最好;2)当钢质蒙皮厚度为1×103m时,能够抵抗弹片的冲击;3)当骨架数为18时,防护门在重量和最大应力两个指标取得最优。本文根据给定爆炸载荷,分析了该载荷下防护门失效情况。在等效静载为3×105Pa的作用下,碳纤维复合材料防护门最大应力为2.14×108Pa,最大位移为7.488×103m。增大施加在防护门上的载荷,当等效静载为3×106Pa时,最大应力为2×109Pa,最大位移为5.222×102m,碳纤维复合材料防护门失效,该碳纤维复合材料防护门抵抗静载能力为3×106Pa,对应的抗动载能量为2.5×106Pa,即该碳纤维复合材料防护门的抗力为2.5×106Pa,能够满足防护要求。
[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 掳to 0 掳is the highest, and the optimum layer is [0 掳4 / 45 掳/ 0 掳4 / -45 掳/ 0 掳4 / 45 掳/ 0 掳4 / -45 掳] 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 掳, 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.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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