本文選題：CFRP + 斷裂力學(xué)��； 參考：《中國艦船研究院》2015年碩士論文

【摘要】：目前世界各地在役的基礎(chǔ)設(shè)施中存在大量的金屬工程結(jié)構(gòu),這些結(jié)構(gòu)在長期的環(huán)境載荷和工程載荷的共同作用下,容易產(chǎn)生各種問題,需要對其進(jìn)行修復(fù)和加固。以往經(jīng)常使用的加固方法為焊接加固法,即在待加固結(jié)構(gòu)上焊接鋼蓋板或其他型材。目前焊接加固法已經(jīng)發(fā)展較為成熟,得到廣泛的運(yùn)用,但同時(shí)也存在許多問題,如焊接后結(jié)構(gòu)局部組織脆化、殘余應(yīng)力較高、焊接質(zhì)量受環(huán)境及操作人員的影響等。而用復(fù)合材料加固修復(fù)鋼結(jié)構(gòu)作為一種全新的方法,以其高強(qiáng)度、高彈性模量、良好的耐腐蝕性、耐久性、耐疲勞性等優(yōu)點(diǎn)越來越受到工程界的重視。目前復(fù)合材料加固修復(fù)鋼結(jié)構(gòu)技術(shù)已經(jīng)在土木工程領(lǐng)域和航空航天領(lǐng)域得到一定的應(yīng)用,而在船舶與海洋結(jié)構(gòu)上的應(yīng)用和研究尚少。系統(tǒng)的加固設(shè)計(jì)方法和疲勞加固設(shè)計(jì)方法仍然有待進(jìn)一步的試驗(yàn)研究和理論分析。本論文首先對復(fù)合材料加固各種類型鋼結(jié)構(gòu)的加固特點(diǎn)和研究現(xiàn)狀以及本文研究中涉及的理論知識(復(fù)合材料經(jīng)典層合板理論、加固板裂紋尖端應(yīng)力強(qiáng)度因子計(jì)算方法、Dugdale大范圍塑性斷裂力學(xué)模型等)進(jìn)行了闡述。通過Dugdale的大范圍塑性斷裂力學(xué)模型,以鋼材屈服為標(biāo)準(zhǔn),以加固后構(gòu)件承載能力不低于無損傷構(gòu)件的承載能力為目標(biāo),確定了加固量的取值。在已有理論研究的基礎(chǔ)上,結(jié)合有限元方法,確定了有效粘貼長度、有效粘貼寬度、鋪層設(shè)計(jì)這幾個(gè)加固參數(shù)的取值。通過前章對加固量、相關(guān)加固參數(shù)的計(jì)算確定靜態(tài)拉伸試驗(yàn)試件制作方案。通過靜態(tài)拉伸試驗(yàn)探究了加固試件的破壞過程、破壞形式。通過對位移-載荷曲線、破壞形態(tài)和特征載荷的分析驗(yàn)證了加固量和加固參數(shù)的有效性。通過計(jì)算加固板裂紋尖端應(yīng)力強(qiáng)度因子并結(jié)合Paris公式,預(yù)估疲勞載荷下試件的剩余壽命。通過單側(cè)加固和雙側(cè)加固的疲勞試驗(yàn)檢驗(yàn)剩余疲勞壽命計(jì)算方法的準(zhǔn)確性。對CFRP加固鋼板的環(huán)境耐受性進(jìn)行了試驗(yàn)研究,探究了CFRP加固鋼板的防腐蝕作用和環(huán)境因素對粘結(jié)性能的影響。
[Abstract]:At present, there are a large number of metal engineering structures in the existing infrastructure all over the world. Under the combined action of long-term environmental load and engineering load, these structures are easy to produce various problems, which need to be repaired and strengthened.In the past, welding reinforcement method is often used, that is, welding steel cover plate or other section on the structure to be strengthened.At present, welding reinforcement method has been developed and widely used, but there are also many problems, such as local structure embrittlement after welding, high residual stress, welding quality affected by environment and operator, etc.As a new method, steel structures strengthened with composite materials have been paid more and more attention by the engineering field for their high strength, high elastic modulus, good corrosion resistance, durability, fatigue resistance and so on.At present, composite material reinforcement and repair of steel structures has been applied in the field of civil engineering and aerospace, but the application and research in ships and marine structures is still few.The reinforcement design method and fatigue reinforcement design method of the system still need further experimental research and theoretical analysis.In this paper, firstly, the characteristics and research status of various types of steel structures strengthened with composite materials and the theoretical knowledge involved in this study (classical laminate theory of composite materials) are discussed.The calculation method of stress intensity factor at crack tip of strengthened slab is described in this paper, such as Dugdale's large range plastic fracture mechanics model and so on.Based on the large range plastic fracture mechanics model of Dugdale, taking steel yield as the standard and the bearing capacity of strengthened members not lower than that of non-damaged members as the goal, the value of strengthening amount is determined.Based on the existing theoretical research and the finite element method, the effective bonding length, the effective paste width and the reinforcement parameters of layering design are determined.In the previous chapter, the static tensile test specimen was made by calculating the reinforcement quantity and the relative reinforcement parameters.The failure process and failure form of the strengthened specimens were investigated by static tensile test.Through the analysis of displacement-load curve, failure form and characteristic load, the validity of reinforcement quantity and reinforcement parameters is verified.By calculating the stress intensity factor at the crack tip of the strengthened plate and combining the Paris formula, the residual life of the specimen under fatigue load is predicted.The accuracy of residual fatigue life calculation method is verified by fatigue tests of unilateral and bilateral reinforcement.The environmental tolerance of steel plate strengthened by CFRP was studied. The corrosion resistance of steel plate strengthened by CFRP and the influence of environmental factors on the bond properties were investigated.
【學(xué)位授予單位】：中國艦船研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P75

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本文編號：1765243