scholarly journals Effectiveness of foil-shaped manganin gauge in pressure measurement of shock wave in solid.

1984 ◽  
Vol 5 (1) ◽  
pp. 11-15
Author(s):  
Yoshimasa Yasumoto ◽  
Ken-ichi Kondo ◽  
Akira Sawaoka
Keyword(s):  
Shock Wave ◽  
Pressure Measurement ◽  
Manganin Gauge

Ultrafast pressure measurement in shock wave research using fiber Bragg grating sensors

2018 ◽  
Author(s):  
Ehud Shafir ◽  
Shlomi Zilberman ◽  
Yair Saadi ◽  
Ofek Gillon ◽  
Alexander Fedotov Gefen ◽  
...  
Keyword(s):  
Shock Wave ◽  
Fiber Bragg Grating ◽  
Pressure Measurement ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors ◽  
Wave Research

High Pressure Generation Using Underwater Explosion of a Spiral Explosive in a Conical Vessel

2004 ◽  
Vol 126 (2) ◽  
pp. 258-263
Author(s):  
Toru Hamada ◽  
Shigeru Itoh ◽  
Kenji Murata ◽  
Yukio Kato
Keyword(s):  
Shock Wave ◽  
Characteristic Curve ◽  
Three Dimensional ◽  
Underwater Explosion ◽  
Initial Pressure ◽  
Maximum Pressure ◽  
Underwater Shock Wave ◽  
Expansion Curve ◽  
Underwater Shock ◽  
Manganin Gauge

An explosive configuration was studied so that the underwater shock wave converges at the tip of the explosive, and a three-dimensional spiral configuration was obtained. This spiral configuration need to be analyzed theoretically due to the relation of propagation velocity of underwater shock wave, detonation velocity of the explosive and a configuration of vessel to charge the explosive. In order to study an effect of the convergence, pressure measurement at the spiral center was carried out by using a manganin gauge. Therefore, when SEP was used in this experiment, the maximum pressure value was 17.7 GPa. This maximum pressure value is higher than the pressure value of underwater shock wave generated from the underwater explosion of a straight configuration. Furthermore, this maximum pressure value was higher than C-J pressure of SEP. An initial pressure of underwater shock water shock wave that can obtain from an isentropic expansion curve of SEP and a characteristic curve of water is 5.7 GPa, and C-J pressure of SEP is 15.9 GPa. From the above-mentioned, the effect of spiral convergence could be shown well.

scholarly journals Experimental Study on Ramp Shock Wave Control in Ma3 Supersonic Flow Using Two-Electrode SparkJet Actuator

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1679
Author(s):  
Wei Xie ◽  
Zhenbing Luo ◽  
Yan Zhou ◽  
Lin Wang ◽  
Wenqiang Peng ◽  
...  
Keyword(s):  
Shock Wave ◽  
Supersonic Flow ◽  
Flow Field ◽  
Pressure Measurement ◽  
Separation Zone ◽  
Dynamic Pressure ◽  
Base Flow ◽  
Control Effect ◽  
Dynamic Pressure Measurement ◽  
Wave Control

The control of a shock wave produced by a ramp (ramp shock) in Ma3 supersonic flow using a two-electrode SparkJet (SPJ) actuator in a single-pulse mode is studied experimentally. Except for schlieren images of the interaction process of SPJ with the flow field, a dynamic pressure measurement method is also used in the analysis of shock wave control. In a typical experimental case, under the control of single-pulsed SPJ, the characteristic of ramp shock changes from “short-term local upstream motion” in the initial stage to “long-term whole downstream motion” in the later stage. The angle and position of the ramp shock changes significantly in the whole control process. In addition, the dynamic pressure measurement result shows that the ramp pressure is reduced by a maximum of 79% compared to that in the base flow field, which indicates that the ramp shock is significantly weakened by SPJ. The effects of some parameters on the control effect of SPJ on the ramp shock are investigated and analyzed in detail. The increase in discharge capacitance helps to improve the control effect of SPJ on the ramp shock. However, the control effect of the SPJ actuator with medium exit diameter is better than that with a too small or too large one. In addition, when the SPJ exit is located in the separation zone and outside, the change in the ramp shock shows significant differences, but the control effect in the case of medium ramp distance is better when the SPJ exit is located outside the separation zone.

Inhibition of Crystallization of Rubber by High Pressure

1939 ◽  
Vol 12 (3) ◽  
pp. 496-497 ◽  
Author(s):  
R. B. Dow
Keyword(s):  
High Pressure ◽  
Pressure Measurement ◽  
Atmospheric Pressure ◽  
Isopropyl Alcohol ◽  
Amorphous State ◽  
Time Curve ◽  
Temperature Range ◽  
The Press ◽  
Pressure Changes ◽  
Manganin Gauge

Abstract Bekkedahl has shown that crude rubber at atmospheric pressure freezes in the temperature range from −40° to + 10°C. and melts in the temperature range from 6° to 16° C. The transition is from amorphous rubber to crystalline rubber which is the stable modification between −72° and 6° C. His measurements of the freezing at 0° C. showed that about 280 hours were necessary for completion of the transition, the volume decreasing by 2.2 per cent in such a manner that the volume-time curve was S-shaped. This communication reports the inhibition of crystallization at high pressure. Crude smoked sheets were packed tightly in a pressure chamber and isopropyl alcohol was used to transmit the pressure. The chamber was kept at 0° C. in a well-circulated ice bath. A pressure of 8000 kg. per sq. cm. was applied, and its constancy observed over a period of 14 days. The sensitivity of the manganin gauge used for pressure measurement was such that changes of 5 kg. per sq. cm. were detectable. Outside of slight erratic pressure changes caused by change of temperature around part of the press that was not kept at 0°, “no change of pressure due to crystallization was detected during the 14 days.” Examination of the rubber immediately after pressure was released showed that it was still in the amorphous state.

Intracranial Pressure Measurement Within the Rat Skull is Sensitive to Shock Wave Intensity and Weight of the Specimen

2011 ◽  
Author(s):  
Richard Bolander ◽  
Cynthia Bir ◽  
Pamela VandeVord
Keyword(s):  
Shock Wave ◽  
Intracranial Pressure ◽  
Pressure Measurement ◽  
Wave Exposure ◽  
Brain Trauma ◽  
Wave Intensity ◽  
Associated Injuries ◽  
Pressure Pulses ◽  
The Brain

Blast associated injuries have been quantified into different classes based on the type of trauma that they create [1]. Of these types of trauma, the neuropathology invoked by shock wave exposure is the most ambiguous [1]. The properties associated with shock wave exposure have lead to multiple hypothesized mechanisms for brain trauma including: acceleration-based damage, a thoracic squeeze resulting in pressure pulses to the brain, or transference of energy from the shock wave into the brain via the skull [2, 3].

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