Abstract: With the development of the computer technology, the non-linear finite element method has become the most effective method for calculating and evaluating the ultimate bearing capacity of the structure. The non-linear finite element method includes the three different analysis methods, namely the arch length method, the damping factor method and the quasi-static method. The greatest advantages of the quasi-static method is that the center differential has no convergence problem in the explicit time integration, and can better solve the problem of the complex structure collapse. The non-linear finite element analysis of the ultimate strength of the hull cabin has been carried out based on the quasi-static method. The variations of the ultimate strength of the hull cabin under different time steps are compared, and the influence of the different material models on the ultimate strength of the cabin is researched to explore the failure mechanism. It provides technical support for the subsequent research of the ship ultimate strength.

Key words: non-linear, ultimate strength, quasi-static method, failure mechanism

摘要： 随着计算机技术不断发展,非线性有限元法已成为计算和评估结构极限承载能力最有效的方法。在非线性有限元法中,有3种不同的分析方法,分别为弧长法、阻尼因子法和准静态法。准静态法最大的优势在于中心差分进行显式时间积分不存在收敛性问题,能够更好地求解复杂结构崩溃问题。该文基于准静态法开展船体舱段极限强度非线性有限元分析,比较不同时间步长条件下舱段极限强度变化趋势,研究不同材料模型对舱段极限强度的影响规律,并揭示舱段失效机理;为后期船舶结构极限强度研究提供技术支撑。

关键词: 非线性, 极限强度, 准静态法, 失效机理