基于ABAQUS的载人潜水器观察窗结构蠕变行为分析

目的]观察窗作为载人潜水器(HOV)人员和结构安全的核心部件,准确计算其长周期载荷作用下的结构蠕变性能极其重要.方法]首先,基于观察窗树脂玻璃材料(丙烯酸塑料材料)拉伸试件蠕变测试数据结果,通过多参数比较优化方法确定时效硬化蠕变模型的基本参数;然后,通过ABAQUS进行观察窗结构建模,耦合时效硬化模型和结构接触,以...

Creep behavior analysis of conical observation window for human occupied vehicle based on ABAQUS

Objectives]The observation window is the most important component of a human occupied vehicle(HOV)for personnel and structural safety.As such,it is extremely important to accurately calculate its creep performance under long-period loads.Methods]First,based on the tensile specimen creep test data,when the specimen and observation window material is polymethyl methacrylate(PMMA),the basic parameters of the age hardening creep model are determined using a multi-parameter comparison and optimization method with reference to the test curves.The observation window structure is then modeled through ABAQUS.Coupled with the age hardening model and structural contact,the creep performance of the window structure is analyzed.Finally,based on the presented finite element model,the creep behavior of the observation window structure under the multi-parameter structure and different loading rates is carried out respectively.Results]The calculation results show that the numerical and experimental test results are in good agreement under both the calculation verification model and physical observation window structure,revealing the reliability of the observation window structure creep model under high-pressure load.Based on age hardening,the numerical results of the creep model are in higher agreement with the real mechanical behavior of the observation window structure and actual engineering applications.The structure of the observation window with a conical angle of 70°under parametric optimization is more reasonable and optimized,and the stress level and creep performance of the structure are better.Under high pressure,the phenomena of"pits"near the center of the high-pressure surface of the observation window and"peeling"inside the window are the result of the structural creep response.Conclusions]The results of this study on the creep behavior of the observation window structure based on the ABAQUS creep model are accurate and reliable,providing theoretical references for the design optimization and life analysis of manned submersibles.