基于连续介质损伤力学的钛合金耐压球壳极限强度分析  

Ultimate strength analysis of titanium alloy pressure spherical shell based on continuum damage mechanics

作　　者：张博文[1,2] 万正权 赵青[1,2] 徐强 张爱锋 ZHANG Bo-wen;WAN Zheng-quan;ZHAO Qing;XU Qiang;ZHANG Ai-feng(China Ship Scientific Research Center,Wuxi 214082,China;Taihu Laboratory of Deepsea Technological Science,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心,江苏无锡214082 [2]深海技术科学太湖实验室,江苏无锡214082

出　　处：《船舶力学》2024年第1期92-102,共11页Journal of Ship Mechanics

基　　金：中国科学院冷泉装置前期关键技术攻关项目(LQ-GJ-02)。

摘　　要：本文在连续介质损伤力学理论框架下,以深海载人装备耐压球壳结构为研究对象,开展Bonora损伤模型适用性研究。首先,设计TA31钛合金加载卸载试验,依据试验结果,分析Bonora模型参数对材料应力应变响应的影响规律;随后,提出一种模型参数校准方法,依据试验数据确定TA31钛合金的模型参数;最后,将Bonora模型通过VUMAT子程序的形式嵌入到有限元软件中,开展钛合金球壳结构的极限强度分析,并与传统方法进行对比。研究结果表明,在耐压球壳极限强度分析中,引入Bonora模型可以准确模拟耐压球壳结构的失效模式和破坏压力。该模型在材料本构关系中考虑了屈服强度、抗拉强度以及最大塑性应变的影响,结构失效的物理意义更加明确,对材料性能的优化与提升具有指导意义。In this paper,the Bonora damage model based on continuum damage mechanics was adopted to an-alyze the pressured spherical hulls of deep-sea manned submersibles.Firstly,the loading and unloading test of TA31 titanium alloy was committed to investigating the parameters of Bonora model.Then,a calibration method of model parameters was proposed,and the model parameters of TA31 titanium alloy were deter-mined according to the experimental data.Finally,the Bonora model was embedded into the finite element software in the form of VUMAT subroutine,and the analysis of ultimate strength of titanium alloy pressured spherical hull was carried out.The results show that the method based on Bonora model can accurately simu-late the failure mode and ultimate strength of the pressured spherical hull.In this model,the effects of yield strength,tensile strength and maximum plastic strain were considered in the constitutive relation of materials,and the physical meaning of structural failure was more explicit,which has guiding significance for the opti-mization and promotion of material properties.

关 键 词：钛合金 耐压球壳 连续介质损伤力学 Bonora模型 数值模拟 

分 类 号：U661.43[交通运输工程—船舶及航道工程]