本文選題：碳纖維復(fù)合材料　切入點：超聲脈沖反射信號　出處：《振動與沖擊》2016年12期 　論文類型：期刊論文

【摘要】：對層狀碳纖維復(fù)合材料(CFRP)超聲反射系數(shù)進(jìn)行建模并研究超聲波在CFRP內(nèi)的共振特性。首先建立了聲波在多層介質(zhì)中傳播時的反射系數(shù)頻響模型;在此基礎(chǔ)上對多層CFRP反射系數(shù)頻域響應(yīng)進(jìn)行數(shù)值計算并對反射系數(shù)頻響隨CFRP層數(shù)的變化特征進(jìn)行分析;結(jié)果表明使用中心頻率接近層狀CFRP固有共振頻率的超聲探頭進(jìn)行檢測時,超聲波在層狀CFRP中將產(chǎn)生共振現(xiàn)象;在CFRP層數(shù)較少時,共振結(jié)構(gòu)噪聲中會夾雜其他頻率的信號成分。隨著CFRP層數(shù)增加,共振結(jié)構(gòu)噪聲在信號共振區(qū)域的占比將會提高;當(dāng)CFRP層數(shù)增加到一定數(shù)量后,共振結(jié)構(gòu)噪聲將只在離超聲波入射表面較近的區(qū)域出現(xiàn);隨著超聲波遠(yuǎn)離入射表面,共振結(jié)構(gòu)噪聲將逐漸消失。最后對薄板型CFRP和厚截面CFRP的實驗信號進(jìn)行分析,得到的實驗結(jié)果和數(shù)值計算結(jié)果相一致。
[Abstract]:The ultrasonic reflection coefficients of layered carbon fiber composites (CFRP) were modeled and the resonance characteristics of ultrasonic waves in CFRP were studied. On this basis, the frequency domain response of multilayer CFRP reflection coefficient is numerically calculated and the characteristics of reflection coefficient frequency response with the number of CFRP layers are analyzed. The results show that the ultrasonic probe with center frequency close to the inherent resonance frequency of layered CFRP is used to detect the frequency response. Ultrasonic wave will produce resonance phenomenon in layered CFRP, when the number of CFRP layers is small, the resonance structural noise will include other frequency signal components. With the increase of CFRP layer number, the proportion of resonance structural noise in the resonance region will increase. When the number of CFRP layers increases to a certain number, the resonant structural noise will only appear in the area near the incident surface of the ultrasonic wave, as the ultrasonic wave is far away from the incident surface, The resonant structural noise will gradually disappear. Finally, the experimental signals of thin plate CFRP and thick section CFRP are analyzed, and the experimental results are in agreement with the numerical results.
【作者單位】： 浙江大學(xué)流體動力與機電系統(tǒng)國家重點實驗室;中國計量學(xué)院計量測試工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51075358) 浙江省自然科學(xué)基金資助項目(LY14E050013) 浙江省‘儀器科學(xué)與技術(shù)’重中之重學(xué)科開放基金資助項目(JL130112)
【分類號】：TB33

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