Blasting Performance And Constitutive Relationship Of Rupture Disc Under Dynamic Overpressure Conditions

As a precise pressure relief element,bursting discs are widely used in engineering.After investigation,under the dynamic overpressure condition with high boost rate,the actual burst pressure of the rupture disc may exceed its static calibrated burst pressure,which brings potential danger to the use of the rupture disc.Existing standards and regulations mostly limit the use occasions to static working conditions by limiting the range of the boost rate,but in dynamic working conditions,whether the rupture disc can be used and how to use it remains to be solved.It is very important to fully understand the impact of the dynamic overpressure conditions of the rupture disc on its blasting performance.Based on this,through the design and construction of a dynamic overpressure blasting experimental platform,the dynamic blasting performance of the forward arch slotted and reverse arch slotted rupture discs was systematically studied.The main research contents and conclusions are as follows:(1)A dynamic overpressure blasting experimental platform for rupture discs was built,and the dynamic bearing behavior of the rupture discs was obtained by means of flammable medium explosion.The calculation method of the boosting rate of the rupture disc under dynamic overpressure is defined.(2)Carrying out the dynamic bearing experiment of the front arch slotted rupture disc.The results show that the bursting pressure of the bursting disc under dynamic conditions is significantly greater than the static bursting pressure.As the boost rate increases,the overpressure multiple increases,and the two conform to a power function relationship.The analysis found that the back pressure bracket of the main arch slotted rupture disc is the main reason for the significant difference between its dynamic explosion pressure and static blast pressure.At this level,the overpressure of the improved structure is significantly lower than that of the unimproved structure.(3)The dynamic bearing experiment of the reverse arch with grooved rupture disc was carried out.The results show that the burst pressure under dynamic conditions is greater than its static burst pressure.As the boost rate increases,the relationship between the overpressure multiple and the boost rate gradually changes from a power function relationship to a linear relationship.The size of the rupture disc has little effect on the trend of the experimental results.(4)The method of obtaining stress and strain of the rupture disc under dynamicbiaxial tension is constructed,that is,the grid line is set on the specimen by laser scoring combined with the theoretical mathematical method,and finally the stress-strain relationship of the top of the specimen is obtained.A dynamic two-way tensile experiment method was designed.The dynamic two-way stretching was achieved by sacrificing the settings of the rupture disc and the determination of the two rupture discs.It was found that with the increasing pressure increase rate,the smaller the equivalent strain at the top of the pole under the same pre-arch pressure,that is,the specimen can bear a greater load under the same strain.Taking the effect of static biaxial tensile lower limit as the basis of judgment,the concept of dynamic strength was proposed,and the dynamic overpressure response mechanism of the bursting disc was explained as an index.(5)Combining all influencing factors,two parameters,dynamic constitutive influence factor and dynamic structural response factor,are proposed to predict the dynamic burst pressure of the rupture disc.Combined with the actual engineering considerations,the safety factor is proposed to obtain the prediction formula for the bursting pressure of the bursting disc under dynamic overpressure conditions during the practical application of the project.