本文選題：CFRP拉擠板材 + 濕熱老化��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：碳纖維增強(qiáng)樹脂復(fù)合材料(CFRP,Carbon Fibre-Reinforced Plastic)具有輕質(zhì)高強(qiáng)、耐腐蝕等優(yōu)異性能,被廣泛應(yīng)用于土木工程結(jié)構(gòu)的加固、修復(fù)或升級(jí)。在上述應(yīng)用服役過程中,CFRP材料不僅面對(duì)嚴(yán)苛的室外環(huán)境(如濕熱、浸泡等),同時(shí)還將受到循環(huán)荷載的作用(如CFRP加固橋面板受到的車輛循環(huán)荷載等)。CFRP在嚴(yán)苛環(huán)境及循環(huán)荷載作用下的性能演化對(duì)CFRP材料及其增強(qiáng)結(jié)構(gòu)的服役壽命具有重要影響。鑒于此,本文擬研究水或強(qiáng)堿溶液(混凝土滲出水)浸泡對(duì)CFRP拉擠板材抗彎疲勞壽命性能的影響規(guī)律與機(jī)理,研究結(jié)果將促進(jìn)高性能CFRP板材的研發(fā)及其土木工程安全應(yīng)用。首先,本文整理歸納了國內(nèi)外濕熱老化對(duì)CFRP復(fù)合材料疲勞性能的研究進(jìn)展;測試了兩種環(huán)氧樹脂基體的CFRP拉擠板材的基本力學(xué)與熱性能;最后,研究了不同溫度下水、堿溶液和海水浸泡對(duì)CFRP靜態(tài)力學(xué)性能及疲勞性能的影響規(guī)律與機(jī)理。研究結(jié)果表明,水堿鹽溶液浸泡導(dǎo)致CFRP板材的靜態(tài)力學(xué)性能出現(xiàn)不同程度的退化;浸泡導(dǎo)致樹脂-碳纖維界面粘結(jié)性能強(qiáng)度明顯降低,但對(duì)CFRP的宏觀性能(彎曲強(qiáng)度和彎曲模量)影響較小;由于吸收水分的塑化作用,導(dǎo)致CFRP玻璃化溫度隨浸泡時(shí)間增長逐漸降低。水堿鹽溶液對(duì)CFRP板材力學(xué)性能的影響相近;溫度升高,CFRP材料性能退化加速;另外,普通環(huán)氧樹脂基CFRP拉擠板材浸泡后性能保持率好于海因樹脂基CFRP拉擠板材。CFRP拉擠板材的彎曲疲勞結(jié)果表明,兩種CFRP拉擠板材的彎曲疲勞破壞過程可以包含兩階段的剛度退化;CFRP拉擠板材抗彎疲勞的S-N疲勞壽命曲線表明,海因樹脂基CFRP拉擠板材的彎曲疲勞性能優(yōu)于普通環(huán)氧樹脂基體CFRP板材。溶液浸泡后,CFRP拉擠板材中樹脂基體發(fā)生開裂、碳纖維與樹脂的界面產(chǎn)生脫離和分層,縮短了第一階段剛度退化過程;海水浸泡導(dǎo)致海因樹脂基CFRP拉擠板材疲勞性能的退化較普通環(huán)氧樹脂基CFRP拉擠板材更為明顯。
[Abstract]:Carbon fiber reinforced resin (CFRP) carbon Fibre-Reinforced plastic has been widely used in strengthening, repairing and upgrading of civil engineering structures for its excellent properties such as lightweight and high strength, corrosion resistance and so on.In the service of the above applications, CFRP materials not only face harsh outdoor environment (such as damp and heat),Soaking in the same time will also be affected by the cyclic load (such as the cyclic load on the deck of the bridge strengthened by CFRP and so on.) the evolution of the performance of the CFRP under harsh environment and cyclic load has an important influence on the service life of the CFRP material and its reinforced structure.In view of this, this paper intends to study the influence of water or strong alkali solution (concrete seepage water) on the flexural fatigue life of CFRP extruded sheet. The research results will promote the research and development of high performance CFRP sheet and its safety application in civil engineering.First of all, this paper summarized the research progress of CFRP composite fatigue properties caused by wet and thermal aging at home and abroad, tested the basic mechanical and thermal properties of two kinds of epoxy resin matrix CFRP pullout plates, finally, studied the water at different temperatures.Effect of alkali solution and seawater immersion on static mechanical properties and fatigue properties of CFRP.The results show that the static mechanical properties of CFRP plates degrade in varying degrees due to soaking in aqueous solution, and the bond strength at the interface between resin and carbon fiber decreases obviously after soaking.However, it has little effect on the macroscopic properties (bending strength and modulus) of CFRP, and the glass transition temperature of CFRP decreases with the increase of soaking time due to the plasticizing effect of absorbing water.The effect of aqueous alkali-salt solution on the mechanical properties of CFRP sheets is similar; the degradation of properties of CFRP materials is accelerated with the increase of temperature; in addition,The results of bending fatigue of ordinary epoxy resin based CFRP extruded sheet show that the retention rate of properties is better than that of Hydrin resin base CFRP pultrusion plate.The bending fatigue failure process of two kinds of CFRP pullout plates can include two stages of stiffness degradation. The S-N fatigue life curve shows that the bending fatigue life of the two CFRP pullout plates can be obtained.The flexural fatigue property of CFRP extruded board is better than that of common epoxy resin matrix CFRP sheet.After soaking in solution, the resin matrix cracks in CFRP extruded sheet, the interface between carbon fiber and resin is separated and delaminated, and the first stage stiffness degradation process is shortened.The degradation of fatigue properties of CFRP extruded board based on sea water is more obvious than that of CFRP extruded plate based on common epoxy resin.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB332

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 高宏;張繼文;;土木工程用FRP材料的疲勞性能研究[J];江蘇建筑;2006年01期

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本文編號(hào)：1764484