【摘要】：隨著碳纖維復(fù)合材料在航空航天領(lǐng)域的需求越來越大,迫切需要對碳纖維復(fù)合材料進(jìn)行及時(shí)的損傷檢測,避免由于結(jié)構(gòu)損傷帶來的重大安全隱患。碳纖維復(fù)合材料的損傷檢測方法有很多,而電渦流檢測法作為常見的無損檢測方法因?yàn)槠浣Y(jié)構(gòu)簡單、非接觸、不需要耦合劑等特點(diǎn)得到廣泛的使用,并且由于碳纖維復(fù)合材料本身由導(dǎo)電的碳纖維和絕緣的基體材料組成而呈現(xiàn)弱導(dǎo)電性,使得碳纖維復(fù)合材料的電渦流檢測成為可能。本文主要使用電渦流檢測法對碳纖維復(fù)合材料進(jìn)行損傷檢測。為了滿足不同場合對激勵信號頻率的不同需求,本文設(shè)計(jì)研制了一套高頻電磁渦流檢測系統(tǒng),其檢測頻率可以高達(dá)10MHz,頻率可以任意調(diào)節(jié),系統(tǒng)集成度高,體積小,使用簡單方便。本文主要研究內(nèi)容有:第一,根據(jù)提出的整體方案對高頻電磁渦流檢測系統(tǒng)進(jìn)行了硬件電路設(shè)計(jì),包含了電源模塊、激勵信號處理模塊、自動平衡模塊、鎖相放大模塊、STM32核心模塊、正弦信號發(fā)生模塊、數(shù)據(jù)采集模塊、自動平衡控制模塊以及USB通信模塊。第二,對高頻電磁渦流檢測系統(tǒng)進(jìn)行了軟件設(shè)計(jì),主要包含上位機(jī)軟件和下位機(jī)軟件,上位機(jī)實(shí)現(xiàn)的主要功能為控制下位機(jī)工作以及檢測的過程,而下位機(jī)實(shí)現(xiàn)的主要功能為接收上位機(jī)的命令執(zhí)行不同的操作。第三,對高頻電磁渦流檢測系統(tǒng)進(jìn)行實(shí)驗(yàn)驗(yàn)證,用制作的高頻電磁渦流檢測系統(tǒng)對碳纖維復(fù)合材料的常見損傷進(jìn)行了檢測,包括裂紋、沖擊以及分層等,證明了系統(tǒng)的可行性以及實(shí)用性。
[Abstract]:With the increasing demand of carbon fiber composites in the field of aerospace, it is urgent to detect the damage of carbon fiber composites in time to avoid the major safety risks caused by structural damage. There are many damage detection methods for carbon fiber composites, and eddy current testing is widely used as a common nondestructive testing method because of its simple structure, non-contact, no need of coupling agent and so on. Because the carbon fiber composite is composed of conductive carbon fiber and insulating matrix material, it is possible to detect the eddy current of carbon fiber composite. In this paper, Eddy current testing method is used to detect the damage of carbon fiber composites. In order to meet the different demands of excitation signal frequency in different situations, a high frequency electromagnetic eddy current detection system is designed and developed. The frequency can be adjusted arbitrarily, and the system is of high integration and small volume. Easy to use. The main contents of this paper are as follows: first, the hardware circuit of the high frequency electromagnetic eddy current detection system is designed according to the overall scheme, including power supply module, excitation signal processing module, automatic balance module, phase-locked amplifier module. STM32 core module, sinusoidal signal generation module, data acquisition module, automatic balance control module and USB communication module. Secondly, the software design of the high frequency electromagnetic eddy current detection system is carried out, which mainly includes the upper computer software and the lower computer software. The main function of the upper computer is to control the work of the lower computer and the process of detection. The main function of the lower computer is to receive the commands of the upper computer to perform different operations. Thirdly, the high frequency electromagnetic eddy current testing system is used to test the common damage of carbon fiber composites, including crack, impact and delamination. The feasibility and practicability of the system are proved.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TB302.5;TP274

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