本文選題：碳纖維復合材料　切入點：光纖光柵傳感器　出處：《江蘇大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著時代發(fā)展和科技進步,工程建設的規(guī)模越來越大,數(shù)量越來越多,由此引發(fā)的結構的損傷和破壞等問題亟待解決,結構健康監(jiān)測應運而生,尤其近幾年來,結構智能健康監(jiān)測日漸興起。碳纖維復合材料(Carbon Fiber Reinforced Polymer,CFRP)具有質量輕、強度高、耐疲勞、自感知等特性,光纖光柵傳感器(Fiber Bragg Grating,FBG)具有測量精度高,抗干擾,電絕緣性好,耐腐蝕等特性,基于CFRP和FBG的以上特性,碳纖維復合材料和光纖光柵傳感器在結構智能健康監(jiān)測中的研究和應用已經成為當前的熱點。本文在國家自然科學基金項目“基于碳纖維材料的預應力混凝土結構自感知特性及其應用研究(51478209)”的資助下,主要研究了結合兩種不同特性的自感知智能材料形成功能互補的復合式傳感器件對普通混凝土結構和預應力混凝土結構的損傷監(jiān)測,主要研究內容如下:(1)設計制作了FBG-CFRP傳感元件,并對傳感元件進行了拉伸測試,測定了元件的應變、電阻和FBG傳感器的波長,分析了傳感元件電阻變化率-應變、波長-應變之間的關系,結果表明:在小荷載階段,傳感元件的電阻變化率和應變變化之間近似滿足線性關系,線性擬合度達到0.95以上;傳感元件中的FBG傳感器的傳感性能未發(fā)生改變,應變靈敏度都保持在1.2pm/??,線性擬合相關系數(shù)都在0.9998以上。(2)將FBG-CFRP傳感元件埋入三組普通鋼筋混凝土梁中,對混凝土梁進行了三分點加載試驗,測定了傳感元件的電阻、應變,觀察了混凝土梁的開裂以及破壞過程,分析了傳感元件電阻變化率-荷載、應變-荷載之間的關系,研究了應變突變和混凝土梁開裂之間的關系,結果表明:FBG-CFRP傳感元件可對普通混凝土梁的荷載、應變、損傷等進行監(jiān)測。(3)將FBG-CFRP傳感元件埋入后張拉法澆筑的無粘結式CFRP預應力梁中,對預應力梁進行了三分點加載試驗,測定了傳感元件的電阻、應變,觀察了預應力梁的開裂及破壞過程,分析了傳感元件電阻-荷載、電阻變化率-荷載、應變-荷載之間的關系以及CFRP預應力筋的應變-荷載關系,研究了應變突變與預應力梁開裂之間的關系,結果表明:FBG-CFRP傳感元件的測試結果與實際預應力梁的損傷及破壞過程相符。
[Abstract]:With the development of the times and the progress of science and technology, the scale and quantity of engineering construction is becoming larger and larger, the damage and damage of structure caused by this problem need to be solved urgently, and structural health monitoring emerges as the times require, especially in recent years. Carbon Fiber Reinforced Polymeric carbon fiber reinforced polymer (CFRP) has the characteristics of light weight, high strength, fatigue resistance, self-sensing and so on. Fiber Bragg Grinding Fiber Bragg grating (FBG) sensor has high measurement accuracy, anti-interference and good electrical insulation. Corrosion resistance, etc., based on the above characteristics of CFRP and FBG, The research and application of carbon fiber composites and fiber Bragg grating sensors in structural intelligent health monitoring has become a hot topic at present. The National Natural Science Foundation of China "Prestressed concrete junction based on carbon fiber material" The study of Self-sensing and its applications (51478209) ", The damage monitoring of ordinary concrete structures and prestressed concrete structures by composite sensing devices with complementary functions formed by two kinds of self-sensing intelligent materials with different characteristics is studied. The main research contents are as follows: (1) the FBG-CFRP sensor element is designed and fabricated, and the strain, resistance and wavelength of the FBG sensor are measured by the tensile test of the sensor element, and the rate of change of the resistor of the sensor element is analyzed. The relationship between wavelength and strain shows that at the stage of small load, the linear relationship between the change rate of resistance and strain of sensor element is approximately linear, and the linear fitting degree is more than 0.95; The sensing performance of the FBG sensor in the sensor element has not changed, and the strain sensitivity is maintained at 1.2 pm / r? ? The linear fitting correlation coefficients are all above 0.9998. The FBG-CFRP sensing elements are embedded in three groups of ordinary reinforced concrete beams. The three-point loading test is carried out on the concrete beams, and the resistance and strain of the sensing elements are measured. The cracking and failure processes of concrete beams are observed. The relationship between resistance change rate and load and strain load of sensing elements is analyzed, and the relationship between strain mutation and cracking of concrete beams is studied. The results show that the FBG-CFRP sensing element can be used to monitor the load, strain and damage of the ordinary concrete beam. The FBG-CFRP sensing element is embedded in the unbonded CFRP prestressed beam, and the three-point loading test is carried out on the prestressed beam. The resistance and strain of the sensing element are measured, the cracking and failure process of the prestressed beam are observed, and the resistance-load, resistance change rate and load of the sensing element are analyzed. The relationship between strain and load and between strain and load of CFRP tendons is studied. The results show that the measurement results of the FBG-CFRP sensor are consistent with the damage and failure process of the prestressed beam.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU37

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