【摘要】：船體是由船體板和縱橫骨架組成的箱型圍壁結(jié)構(gòu),在海洋惡劣環(huán)境下,容易發(fā)生構(gòu)件的屈曲破壞。同時由于海水腐蝕作用,使得船體結(jié)構(gòu)極限強度降低,更容易失穩(wěn)破壞。國內(nèi)外船舶老齡化現(xiàn)象十分嚴重,腐蝕損傷已成為影響船舶壽命的主要因素之一。因此,評估船體結(jié)構(gòu)腐蝕后的剩余總縱極限強度,對船舶全壽命期內(nèi)的安全狀態(tài)至關(guān)重要。目前,考慮線性、非線性均勻腐蝕對船舶結(jié)構(gòu)強度影響的研究己較為成熟,但是點蝕對結(jié)構(gòu)強度的影響仍然有很多問題亟待解決。 本文的研究目的是提出含點蝕損傷加筋板極限強度折減因子計算公式,從而為含點蝕損傷加筋板結(jié)構(gòu)極限強度評估提供依據(jù)。本文主要研究內(nèi)容如下： (1)闡述加筋板穩(wěn)定性的相關(guān)理論及有限元計算方法。通過對模型范圍、初始缺陷、蝕坑形狀、網(wǎng)格劃分、邊界條件等的選取,建立含點腐蝕損傷加筋板極限強度計算模型。 (2)分析有限單元類型、蝕坑形狀、蝕坑分布、蝕坑深度、初始柔度、縱向加強筋個數(shù)、腐蝕體積等幾何因素和腐蝕因素對含腐蝕損傷加筋板極限強度的影響,得到含點蝕加筋板極限強度折減因子的主要影響因素。 (3)通過大量非線性有限元模擬計算,得到大量T型和L型點蝕加筋板極限強度。通過分析所得計算數(shù)據(jù),擬合出加筋板極限強度折減因子計算公式。 本文提出的點蝕加筋板極限強度評估方法能夠應(yīng)用于工程實際,根據(jù)點腐蝕檢測數(shù)據(jù),能夠更加準確地計算腐蝕損傷狀態(tài)下結(jié)構(gòu)的極限強度。
[Abstract]:The hull is a box-type structure composed of the hull plate and the longitudinal and transverse frame. Under the harsh marine environment, the buckling failure of the components is easy to occur. At the same time, due to seawater corrosion, the ultimate strength of the hull structure is reduced, and it is more vulnerable to instability and failure. The aging of ships at home and abroad is very serious, corrosion damage has become one of the main factors affecting the life of ships. Therefore, it is very important to evaluate the residual longitudinal ultimate strength of ship structure after corrosion. At present, the research on the effect of linear and nonlinear uniform corrosion on the strength of ship structure is mature, but there are still many problems to be solved urgently. The purpose of this paper is to propose a formula for calculating the ultimate strength reduction factor of stiffened plates with pitting damage, thus providing a basis for the evaluation of ultimate strength of stiffened plates with pitting damage. The main contents of this paper are as follows: (1) the theory of stability of stiffened plates and the finite element method are described. Based on the selection of model range, initial defect, pit shape, mesh division and boundary conditions, a calculation model of ultimate strength of stiffened plate with point corrosion damage is established. (2) finite element type, pit shape, pit distribution, etc. The effect of geometric factors, such as pit depth, initial flexibility, number of longitudinal stiffeners, corrosion volume and corrosion factors, on the ultimate strength of stiffened plates with corrosion damage, The main factors affecting the ultimate strength reduction factor of pitting stiffened plates are obtained. (3) through a large number of nonlinear finite element simulation calculations, a large number of T-type and L-type pitting stiffened plates are obtained. By analyzing the calculated data, the formula of ultimate strength reduction factor of stiffened plate is fitted. The method proposed in this paper can be applied to engineering practice. According to the data of pitting corrosion detection, the ultimate strength of structures under corrosion damage can be calculated more accurately.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U661.43

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