Topic
Overpressure
About: Overpressure is a research topic. Over the lifetime, 3236 publications have been published within this topic receiving 34648 citations.
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TL;DR: It is demonstrated that sampling rate of 1,000 kHz is necessary to capture the correct rise time values, but there were no statistically significant differences between peak overpressure and impulse values for low-intensity shock waves (Mach number <2) at lower rates.
Abstract: Measurement issues leading to the acquisition of artifact-free shock wave pressure-time profiles are discussed. We address the importance of in-house sensor calibration and data acquisition sampling rate. Sensor calibration takes into account possible differences between calibration methodology in a manufacturing facility, and those used in the specific laboratory. We found in-house calibration factors of brand new sensors differ by less than 10% from their manufacturer supplied data. Larger differences were noticeable for sensors that have been used for hundreds of experiments and were as high as 30% for sensors close to the end of their useful lifetime. These observations were despite the fact that typical overpressures in our experiments do not exceed 50 psi for sensors that are rated at 1000 psi maximum pressure. We demonstrate that sampling rate of 1000 kHz is necessary to capture the correct rise time values, but there were no statistically significant differences between peak overpressure and impulse values for low-intensity shock waves (Mach number < 2) at lower rates. We discuss two sources of experimental errors originating from mechanical vibration and electromagnetic interference on the quality of a waveform recorded using state-of-the-art high-frequency pressure sensors. The implementation of preventive measures, pressure acquisition artifacts and data interpretation with examples, are provided in this paper that will help the community at large to avoid these mistakes. In order to facilitate inter-laboratory data comparison, common reporting standards should be developed by the blast TBI research community. We noticed the majority of published literature on the subject limits reporting to peak overpressure; with much less attention directed towards other important parameters, i.e., duration, impulse and dynamic pressure. These parameters should be included as a mandatory requirement in publications so the results can be properly compared with others.
19 citations
01 Jan 2003
19 citations
TL;DR: In this article, a semi-cylindrical arch and the air medium in its neighborhood loaded by a blast or shock wave is proposed to induce reverberation, which can also cause substantial overpressure through the multiple reflections of the wave.
Abstract: Mutual interaction between a semi-cylindrical arch and the air medium in its neighborhood loaded by a blast or shock wave is the subject of the paper put forward. An impingement of blast wave against structures can cause a reflection of the wave off the surface of the structure followed by a substantial transient aerodynamic load, which can cause a significant deformation of the structure. This deformation can alter the overpressure, which is built behind the reflected shock. In addition, a complex aero-elastic interaction between the blast wave and the structure is developed that can induce a reverberation, which can also cause substantial overpressure through the multiple reflections of the wave. This problem is of particular importance in the new design of future civil, military and underground structures built up from composite materials, as well as of military vehicles.
19 citations
TL;DR: In this paper, the effects of applying different load applications and comparing the dynamic responses of the blast wall were studied, and various kinds of blast pressures were measured by Computational Fluid Dynamics (CFD) simulations on the target area.
19 citations
TL;DR: In this article, the pore diameter and thickness of porous media were analyzed to study the effect of different pore sizes and thickness on the propagation of flame and overpressure of methane explosion in a tube.
Abstract: Porous media has a significant effect on flame and overpressure of methane explosion. In this paper, the pore diameter and thickness of porous media are studied. Nine experimental combinations of different pore diameter and thickness on the propagation of flame and overpressure of methane explosion in a tube are analyzed. The results show that the porous media not only can suppress the explosive flame propagation, but the porous media with large pore diameter can cause deflagration and accelerate the transition of flame from laminar to turbulent. The pore diameter of the porous media mainly determines the quenching of the flame. Simply increasing the thickness of porous media may cause the flame to temporarily stop propagating, but the flame is not completely extinguished for larger pore diameter. However, the deflagration propagation speed of flame is affected by the thickness. The attenuation of overpressure by porous media is mainly reflected in reducing the duration of overpressure and the peak value of overpressure. The smaller the pore diameter, the greater the thickness, and the more remarkable the reduction in overpressure duration and peak value. Suitable pore diameter and thickness of porous media can effectively suppress flame propagation and reduce the maximum value and duration of overpressure.
19 citations