工程層狀結(jié)構(gòu)中的彈性波及其應(yīng)用
發(fā)布時(shí)間：2018-10-14 19:57
【摘要】：層狀結(jié)構(gòu)是工程中普遍存在的結(jié)構(gòu)類型,層狀結(jié)構(gòu)中的界面是工程中的關(guān)鍵部位,界面粘接質(zhì)量的好壞直接影響著工程的運(yùn)營年限和使用安全。因此,界面粘接質(zhì)量的檢測,是加強(qiáng)工程后續(xù)施工質(zhì)量控制的重要保障,也是消除沉降、漏水、坍塌等安全隱患的必要手段,更是確保工程設(shè)計(jì)使用壽命的有效步驟。工程中常使用的檢測方法是彈性波檢測法,也是檢測層介質(zhì)界面加固粘接質(zhì)量比較有效的無損檢測方法,研究各因素對彈性波在工程的層狀結(jié)構(gòu)中的傳播效應(yīng)的影響,對合理設(shè)計(jì)出針對工程實(shí)際問題的檢測方案具有重要的意義。本文的主要研究內(nèi)容及結(jié)果如下:(1)層介質(zhì)材料波阻抗比對彈性波在工程層狀結(jié)構(gòu)中的傳播影響。采用ANSYS有限元軟件的瞬態(tài)動力學(xué)分析模塊,分別建立介質(zhì)置換層材料類型為混凝土、硬質(zhì)巖、軟質(zhì)巖、泥巖的工程層狀結(jié)構(gòu)有限元模型。以界面粘接質(zhì)量好壞進(jìn)行劃分,分別構(gòu)造完整界面和缺陷界面模型,并進(jìn)行求解分析,結(jié)果表明:異質(zhì)性條件下相比均質(zhì)性條件下,反射信號突出,并隨介質(zhì)波阻抗比降低愈加明顯;因?yàn)槿毕莸拇嬖?使得應(yīng)力波以擾動形式繞射傳播到缺陷下表面,進(jìn)而在內(nèi)層介質(zhì)中傳遞能量,而當(dāng)介質(zhì)波阻抗差異面明顯時(shí),透射能量減少,在缺陷兩側(cè)的反射能量增強(qiáng)。(2)界面粗糙度對彈性波在工程層狀結(jié)構(gòu)中的傳播影響。采用ANSYS有限元軟件的瞬態(tài)動力學(xué)分析模塊,分別建立以曲率為0、0.25、0.5、0.75、1來表征不同界面粗糙度的兩層層狀結(jié)構(gòu)有限元模型。以界面形貌差異進(jìn)行劃分,分別構(gòu)造出存在不同界面缺陷的模型,并進(jìn)行求解和分析,結(jié)果表明:當(dāng)界面出現(xiàn)復(fù)雜形貌并隨粗糙度逐漸增加的情況下,多次反射次數(shù)逐漸減少、時(shí)間逐漸減短,當(dāng)粗糙度達(dá)到一定程度時(shí),開始出現(xiàn)反射波形,說明形成延時(shí)反射信號不一定是因?yàn)闄z測對象存在孔洞等缺陷,而只是界面粗糙程度較高導(dǎo)致。(3)界面缺陷對彈性波在工程層狀結(jié)構(gòu)中的傳播影響。通過有限元軟件ANSYS構(gòu)造鋼筋混凝土三層層狀結(jié)構(gòu),首先為了判斷缺陷尺寸對彈性波在其中傳播的影響,分別建立了缺陷橫向尺寸變化對比的四組模型和缺陷縱向尺寸變化對比的四組模型,其次為了判斷缺陷定位相對信號接收位置對彈性波傳播影響,分別建立三組不同缺陷定位模型,并進(jìn)行求解分析,結(jié)果表明:隨著缺陷尺寸橫向長度加長,反射信號波形初次反射波起跳時(shí)間提前,缺陷位置距離接收傳感器位置越遠(yuǎn),頻譜圖中高于共振主頻的頻率對應(yīng)幅值增加,反射能量加強(qiáng)。通過本文的研究,對于采用彈性波法檢測工程層狀介質(zhì)界面粘接質(zhì)量的實(shí)施和數(shù)據(jù)分析具有一定的參考及指導(dǎo)意義。
[Abstract]:Layered structure is a common type of structure in engineering. The interface of layered structure is the key part in engineering. The quality of interface bonding directly affects the operation life and safety of the project. Therefore, the inspection of interface bonding quality is not only an important guarantee to strengthen the quality control of subsequent construction, but also a necessary means to eliminate the hidden dangers of settlement, water leakage, collapse and so on. It is also an effective step to ensure the service life of engineering design. The commonly used detection method in engineering is elastic wave detection method, and it is also an effective nondestructive testing method to detect the bonding quality of layer dielectric interface. The influence of various factors on the propagation effect of elastic wave in engineering layered structure is studied. It is of great significance to reasonably design the detection scheme for practical engineering problems. The main contents and results of this paper are as follows: (1) the influence of wave impedance ratio of layered materials on the propagation of elastic waves in engineering layered structures. By using the transient dynamic analysis module of ANSYS finite element software, the finite element model of engineering layered structure is established, which the material types of media replacement layer are concrete, hard rock, soft rock and mudstone. According to the quality of interface bonding, the complete interface model and defect interface model are constructed, and the results show that the reflected signal is prominent under heterogeneity compared with homogeneity. Because of the defect, the stress wave diffracted to the lower surface of the defect, and then transferred energy in the inner medium, and when the difference surface of the dielectric wave impedance was obvious, the stress wave diffracted to the lower surface of the defect, and when the difference surface of the dielectric wave impedance was obvious, the stress wave diffracted to the lower surface of the defect. The transmission energy decreases and the reflection energy increases on both sides of the defect. (2) the effect of interface roughness on the propagation of elastic waves in engineering layered structures. The transient dynamics analysis module of ANSYS finite element software is used to establish the finite element model of two-layer layered structure with curvature of 0.250.250.5and 0.75-1 to characterize different interfacial roughness. According to the difference of interface morphology, the models with different interface defects are constructed, and solved and analyzed. The results show that the number of multiple reflections decreases gradually when the complex morphology of the interface appears and the roughness increases gradually. The time decreases gradually, when the roughness reaches a certain degree, the reflection waveform begins to appear, which indicates that the formation of the delayed reflection signal is not necessarily due to the defects such as holes in the detection object. It is only due to the high degree of interface roughness. (3) the effect of interface defects on the propagation of elastic waves in engineering layered structures. In order to determine the effect of defect size on the propagation of elastic wave, the finite element software ANSYS is used to construct a reinforced concrete three-story layered structure. In order to judge the influence of the position of defect location on the propagation of elastic wave, four groups of models are established to compare the change of transverse dimension of defect and the change of longitudinal dimension of defect. Three groups of different defect location models were established and solved. The results show that with the length of the defect dimension lengthening, the initial jump time of the reflected signal waveform is advanced, and the defect position is farther away from the receiving sensor position. The corresponding amplitudes of the frequencies above the main resonance frequency in the spectrum are increased and the reflection energy is strengthened. Through the research in this paper, it has certain reference and guiding significance for the application and data analysis of testing the interface bonding quality of engineering layered medium by using elastic wave method.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU43;TB302.5
本文編號：2271488
[Abstract]:Layered structure is a common type of structure in engineering. The interface of layered structure is the key part in engineering. The quality of interface bonding directly affects the operation life and safety of the project. Therefore, the inspection of interface bonding quality is not only an important guarantee to strengthen the quality control of subsequent construction, but also a necessary means to eliminate the hidden dangers of settlement, water leakage, collapse and so on. It is also an effective step to ensure the service life of engineering design. The commonly used detection method in engineering is elastic wave detection method, and it is also an effective nondestructive testing method to detect the bonding quality of layer dielectric interface. The influence of various factors on the propagation effect of elastic wave in engineering layered structure is studied. It is of great significance to reasonably design the detection scheme for practical engineering problems. The main contents and results of this paper are as follows: (1) the influence of wave impedance ratio of layered materials on the propagation of elastic waves in engineering layered structures. By using the transient dynamic analysis module of ANSYS finite element software, the finite element model of engineering layered structure is established, which the material types of media replacement layer are concrete, hard rock, soft rock and mudstone. According to the quality of interface bonding, the complete interface model and defect interface model are constructed, and the results show that the reflected signal is prominent under heterogeneity compared with homogeneity. Because of the defect, the stress wave diffracted to the lower surface of the defect, and then transferred energy in the inner medium, and when the difference surface of the dielectric wave impedance was obvious, the stress wave diffracted to the lower surface of the defect, and when the difference surface of the dielectric wave impedance was obvious, the stress wave diffracted to the lower surface of the defect. The transmission energy decreases and the reflection energy increases on both sides of the defect. (2) the effect of interface roughness on the propagation of elastic waves in engineering layered structures. The transient dynamics analysis module of ANSYS finite element software is used to establish the finite element model of two-layer layered structure with curvature of 0.250.250.5and 0.75-1 to characterize different interfacial roughness. According to the difference of interface morphology, the models with different interface defects are constructed, and solved and analyzed. The results show that the number of multiple reflections decreases gradually when the complex morphology of the interface appears and the roughness increases gradually. The time decreases gradually, when the roughness reaches a certain degree, the reflection waveform begins to appear, which indicates that the formation of the delayed reflection signal is not necessarily due to the defects such as holes in the detection object. It is only due to the high degree of interface roughness. (3) the effect of interface defects on the propagation of elastic waves in engineering layered structures. In order to determine the effect of defect size on the propagation of elastic wave, the finite element software ANSYS is used to construct a reinforced concrete three-story layered structure. In order to judge the influence of the position of defect location on the propagation of elastic wave, four groups of models are established to compare the change of transverse dimension of defect and the change of longitudinal dimension of defect. Three groups of different defect location models were established and solved. The results show that with the length of the defect dimension lengthening, the initial jump time of the reflected signal waveform is advanced, and the defect position is farther away from the receiving sensor position. The corresponding amplitudes of the frequencies above the main resonance frequency in the spectrum are increased and the reflection energy is strengthened. Through the research in this paper, it has certain reference and guiding significance for the application and data analysis of testing the interface bonding quality of engineering layered medium by using elastic wave method.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU43;TB302.5
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