Research On The Bearing Capacity Of Cracked Titanium Alloy Deep-water Submersible

In today’s world,natural resources are in short supply and marine resources have not yet been fully developed.Submersibles are the core equipment for detecting marine resources.The pressure hull is the main component of the submersible.The carrying capacity of the pressure hull directly determines the carrying capacity and safety of the submersible system.Due to the inevitable defects in the materials used to make the pressure hull,the pressure hull alternates in the ocean Fatigue damage is prone to occur under the action of load.In order to ensure the safety of the submersible structure,it is particularly important to study the load-bearing capacity of its pressure shell structure with cracks.Based on the theory of linear elastic fracture mechanics and numerical simulation method,this paper carried out the fatigue life calculation and bearing capacity research of the cracked submersible vehicle based on the partial model of the pressure-resistant structure of the titanium alloy submersible vehicle,and analyzed and analyzed the cracks in the submersible vehicle.Simplified,the WORKBENCH software is used to calculate the stress intensity factor of mode I crack using displacement extrapolation method.In order to ensure the calculation accuracy of the stress intensity factor and improve the calculation efficiency,the sub-model technology is introduced in the stress intensity factor calculation,and the sub-model stress intensity of WORKBENCH is built.In the factor analysis module,the effectiveness of the boundary division of the sub-model was discussed.Finally,the fatigue life of the submersible under different crack depths and different shape ratios was calculated based on the Paris crack growth model,and the different crack depths and different shape ratios were calculated based on the fracture K criterion.The ultimate bearing capacity of the submersible vehicle,the influence of crack depth and shape ratio on the fatigue life and ultimate bearing capacity of the submersible vehicle is analyzed.This paper combines linear elastic fracture mechanics theory and WORKBENCH submodel analysis technology to greatly improve the calculation accuracy and calculation efficiency of the stress intensity factor.The fatigue life prediction and ultimate bearing capacity calculation of the cracked submersible vehicle are completed.The research results have important implications for the fatigue design of the submersible vehicle.for your reference.