含点蚀损伤加筋板结构极限强度研究
发布时间：2018-07-21 13:48
【摘要】：船体是由船体板和纵横骨架组成的箱型围壁结构,在海洋恶劣环境下,容易发生构件的屈曲破坏。同时由于海水腐蚀作用,使得船体结构极限强度降低,更容易失稳破坏。国内外船舶老龄化现象十分严重,腐蚀损伤已成为影响船舶寿命的主要因素之一。因此,评估船体结构腐蚀后的剩余总纵极限强度,对船舶全寿命期内的安全状态至关重要。目前,考虑线性、非线性均匀腐蚀对船舶结构强度影响的研究己较为成熟,但是点蚀对结构强度的影响仍然有很多问题亟待解决。 本文的研究目的是提出含点蚀损伤加筋板极限强度折减因子计算公式,从而为含点蚀损伤加筋板结构极限强度评估提供依据。本文主要研究内容如下： (1)阐述加筋板稳定性的相关理论及有限元计算方法。通过对模型范围、初始缺陷、蚀坑形状、网格划分、边界条件等的选取,建立含点腐蚀损伤加筋板极限强度计算模型。 (2)分析有限单元类型、蚀坑形状、蚀坑分布、蚀坑深度、初始柔度、纵向加强筋个数、腐蚀体积等几何因素和腐蚀因素对含腐蚀损伤加筋板极限强度的影响,得到含点蚀加筋板极限强度折减因子的主要影响因素。 (3)通过大量非线性有限元模拟计算,得到大量T型和L型点蚀加筋板极限强度。通过分析所得计算数据,拟合出加筋板极限强度折减因子计算公式。 本文提出的点蚀加筋板极限强度评估方法能够应用于工程实际,根据点腐蚀检测数据,能够更加准确地计算腐蚀损伤状态下结构的极限强度。
[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.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U661.43
本文编号：2135727
[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.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U661.43
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