Stress Analysis For Strain Strengthening Pressure Vessel

The progress of safety and energy-efficient technology for special equipment isbecoming an important symbol of industrialization, innovation and economic level of a nation.As one of the special equipment, the design, production and management of cryogenicpressure vessels should implement the idea of economy and safety. At present, the materialconsumption of cryogenic pressure vessels, especially some middle-high pressure vesselsdesigned and manufactured by traditional methods is high, the utilization rate is very low andenergy consumption increases accordingly. Expensive alloy materials are used to manufacturecryogenic vessels under extreme conditions, and the production cost of cryogenic vessels willfurther go up. Therefore, it has a great significance to promote the innovation of design andmanufacturing technology of cryogenic pressure vessels for realizing its development towardthe direction of light-weight. The strain strengthening technology which can improve theyield strength of austenitic stainless steel is used to design and manufacture the inner vesselsof vacuum insulation cryogenic storage tanks, and the wall thickness and volume-weight ratioof vessel can be reduced by50%. It greatly lowers the consumption of materials and energywithout affecting the safety of vessels.Based on the material properties of austenitic stainless steel, the basic principle of strainstrengthening technology, as well as its application and development was introduced in thisthesis. The similarities and differences between conventional design and analysis design forpressure vessels were compared. The features of different foreign standards related to strainstrengthening technology of austenitic stainless steel, and design method of strainstrengthening cryogenic vessels were summarized. The general process and requirement ofstrain strengthening were also put forward. Meanwhile, the linear distribution of stressintensity and the plastic deformation at the joint zone of tube and head plate for a pressurevessel under strengthening pressure with different reinforcing structures were analyzed. Theresults show the two reinforcing structures can meet the requirement of plastic deformation ofstrain strengthening pressure vessels, and considering the difference in stress intensity andstrain distribution, the thick-wall tube reinforcement is more reasonable.