本文選題：混凝土 + 聲發(fā)射　； 參考：《燕山大學(xué)》2014年碩士論文

【摘要】：混凝土是最重要也是應(yīng)用最廣泛的建筑材料之一，它的損傷破裂過程一直是力學(xué)、土木工程、材料等各學(xué)科研究的熱點(diǎn)和難點(diǎn)�；炷恋膿p傷演化是一個(gè)復(fù)雜的非線性演化過程，其破壞過程表現(xiàn)為微裂紋的萌生、發(fā)展、貫通直至最終失穩(wěn)破壞。聲發(fā)射技術(shù)是近年發(fā)展起來的一項(xiàng)動(dòng)態(tài)無損檢測技術(shù)，因其操作簡單、靈敏度高、效果直觀并可實(shí)時(shí)監(jiān)測等優(yōu)點(diǎn)，被廣泛應(yīng)用于材料的性能評價(jià)和損傷檢測等領(lǐng)域。本文就是應(yīng)用聲發(fā)射技術(shù)對混凝土的裂紋擴(kuò)展情況和破壞形態(tài)進(jìn)行監(jiān)測，對混凝土材料的損傷演化過程進(jìn)行分析和研究。 本文進(jìn)行了混凝土材料的聲發(fā)射性能研究，建立了混凝土材料內(nèi)部損傷變化和聲發(fā)射信號(hào)參數(shù)變化之間的聯(lián)系。而后進(jìn)行了單軸壓縮試驗(yàn)，加載同時(shí)用聲發(fā)射系統(tǒng)進(jìn)行檢測，比較不同骨料粒徑和表面狀態(tài)的混凝土試件在單軸壓縮條件下的破壞過程和形態(tài)，分析聲發(fā)射信號(hào)參數(shù)與宏觀破壞過程的對應(yīng)關(guān)系，，研究不同試件的聲發(fā)射特征，從細(xì)觀角度揭示混凝土損傷演化過程。 本文進(jìn)行了疲勞加載試驗(yàn)，根據(jù)對試驗(yàn)現(xiàn)象和聲發(fā)射檢測結(jié)果的觀察，將混凝土疲勞破壞階段進(jìn)行分類。把試驗(yàn)所得的全部聲發(fā)射信號(hào)參數(shù)進(jìn)行分析和處理，總結(jié)不同骨料粒徑和表面狀態(tài)的混凝土試件在各個(gè)階段的聲發(fā)射特征和損傷演化規(guī)律。根據(jù)混凝土材料的損傷程度，對混凝土進(jìn)行了分區(qū)描述，定義了混凝土材料的安全區(qū)、損傷區(qū)和破損區(qū)，對分區(qū)的聲發(fā)射參數(shù)閥值標(biāo)準(zhǔn)進(jìn)行了探討。在此標(biāo)準(zhǔn)下，對混凝土材料破損區(qū)的產(chǎn)生條件進(jìn)行研究。
[Abstract]:Concrete is one of the most important and widely used building materials. Its damage and rupture process has been a hot and difficult point in mechanics, civil engineering, materials and other disciplines. The damage evolution of concrete is a complex nonlinear evolution process, and the failure process is characterized by the initiation and development of microcracks, and the failure of concrete through and through to the ultimate instability. Acoustic emission (AE) is a dynamic nondestructive testing technology developed in recent years. Because of its advantages of simple operation, high sensitivity, intuitive effect and real-time monitoring, it is widely used in the field of material performance evaluation and damage detection. In this paper, the acoustic emission technique is used to monitor the crack growth and failure pattern of concrete, and the damage evolution process of concrete material is analyzed and studied. In this paper, the acoustic emission properties of concrete materials are studied, and the relationship between the changes of damage and acoustic emission signal parameters is established. Then uniaxial compression test was carried out, and the loading and acoustic emission system were used to detect the failure process and morphology of concrete specimens with different aggregate size and surface state under uniaxial compression. The relationship between the acoustic emission signal parameters and the macroscopic failure process is analyzed. The acoustic emission characteristics of different specimens are studied and the damage evolution process of concrete is revealed from the viewpoint of meso. In this paper, fatigue loading tests are carried out. According to the observation of the experimental phenomena and the results of acoustic emission testing, the fatigue failure stages of concrete are classified. All the acoustic emission signal parameters obtained from the test are analyzed and processed, and the acoustic emission characteristics and damage evolution laws of concrete specimens with different aggregate size and surface state are summarized. According to the damage degree of concrete material, the zone description of concrete is carried out, the safety zone, damage zone and damage zone of concrete material are defined, and the threshold standard of acoustic emission parameter is discussed. Under this standard, the producing conditions of the damaged zone of concrete material are studied.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528

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