Research on underwater explosion wall pressure loading measuring system based on Hopkinson bar
The bubble load has been experimented by using Hopkinson bar measuring system.According to the stress-strain relationship,the principle of measurement of HPB is that the end-rang stress has been calculated by measuring the face strain.The constitute of the HPB measuring system has been introduced.The analyzing method of material and size of HPB have been provided.The calculated relationship of the strain signal and wall pressure signal has been given.Under laboratory condition,the bubble loads have been measured by using high-speed photography,pressure sensor measuring system and HPB measuring system.The experiment results have been compared.The results show that the time of bubble peak pressure and the period of bubble pulsation are essentially the same by high-speed photography and HPB measuring system.On the condition that explosion distance dimensionless is greater than 0.33,the bubble load experiment results that measured by pressure sensor measuring system basically coincide with the HPB measuring system.HPB measuring system has stronger anti-electromagnetic interference ability on the condition of closer range.Through experiment comparison and analyses,the availability and accuracy of HPB measuring system have been verified.
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