| Due to the development of energy shortage and environmental pollution,the development and utilization of hydrogen energy has attracted the attention of governments.Economic and safe hydrogen energy storage technology is the prerequisite for the scale development of hydrogen energy industry.The high-pressure hydrogen storage technology has the advantages of quick charge and discharge,simple equipment structure and low energy consumption,and is currently the mainstream hydrogen storage method.Metallic materials exposed to high-pressure hydrogen for a long time may exhibit hydrogen gas embrittlement（HGE）.Therefore,it is necessary to evaluate the hydrogen embrittlement sensitivity of materials used in high-pressure hydrogen systems in order to screen metal materials with good hydrogen embrittlement resistance.The disk pressure test method with simple structure and high sensitivity is the most commonly used screening method for hydrogen embrittlement resistant materials in the world.However,there are few studies on the disk pressure test method in China.As an important part of material evaluation of hydrogen embrittlement resistance,China urgently needs to study the disk pressure test method and establish test method standards.The fully functional and high-precision test equipment is the basis for the study of test methods.In summary,it is necessary to develop a test equipment for determination of the susceptibility of metallic materials to hydrogen gas embrittlement.The main works completed are as follows:（1）Using ANSYS to establish a numerical model of disk blasting based on risk method.Investigate the influence of the structural parameters of the disk,the inner ring curvature radius of the high-strength steel ring and the height of the upper cavity on the deformation of the disk.The analysis shows that when the inner ring curvature radius of the high-strength steel ring is small,the disk fails near the fillet area of the steel ring（when t=0.75 mm,r<0.5 mm）.As the fillet radius increases,the final failure area is transferred to the center of the disk,and the burst pressure value tends to be stable（when t=0.75 mm,r≥0.5 mm）.On the other hand,as the thickness of the disk decreases,the disk failure position migrates from the fillet region to the center of the disk（when r=0.5 mm,t≤0.75 mm）.（2）Based on the test requirements of disk pressure test,the main technical indicators of the test device to be developed are determined,and the design scheme of the device is proposed.Exploring the working principle and specific implementation methods of gas supply system,vacuum pumping system,control system and test chamber.Combined with the results of finite element analysis,the specific parameters of the sample size,the inner ring of the pressure ring,the height of the upper cavity,the static sealing structure and the bolt tightening torque were studied and determined.It provides a theoretical basis for the determination of the above key parameters in the national standard GB/T 34542.3-2018.（3）Based on the design scheme,the disk pressure test device is built,and the function verification and structure optimization of the test device are completed.At the same time,the precise pressure control capability of the device in the range of 0.01 MPa.min-1～100 MPa.min-1was verified,and the hydrogen brittleness sensitivity test equipment for metal materials with hydrogen-resistant brittle material screening function was successfully developed.Considering the effect of strain rate on the hydrogen embrittlement of materials,and improving the hydrogen embrittlement sensitivity evaluation procedure for metal materials,the hydrogen embrittlement sensitivity analysis of 316L stainless steel was carried out to verify the feasibility of the evaluation procedure,and provided data support and technical support for the improvement of the test procedure and hydrogen embrittlement sensitivity evaluation procedure in the national standard GB/T 34542.3-2018. |
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