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Xu G.-C.,The Air Force Engineering Design and Research Institute | Gu J.-C.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Zhang X.-Y.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Li C.-X.,The Air Force Engineering Design and Research Institute | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

When material bearing explosive dynamics load is in failure state, it has the shear dilatancy behaviors, at the same time, the material structure and the elastic wave velocity are changed. The material volume strain and the velocity near explosive cavity are measured using strain gauge embedded in model body and acceleration sensor. Measuring results show that, in the model test, the similar failure rock zone area as reality under the explosion circumstance is obtained; the measuring methods are effective and reasonable, when it is used to monitor failure area in explosive model test and it can provide experimental basis for related analysis. Source


Zai J.-M.,Hefei University of Technology | Zai J.-M.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Wang S.-H.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Li Y.-C.,Hefei University of Technology | Yang J.-M.,Hefei University of Technology
Jisuan Lixue Xuebao/Chinese Journal of Computational Mechanics | Year: 2010

Numerical simulation has been conducted on the propagation of the explosion wave on the primary-secondary basis in an axisymmetric tube with varying cross section, using the MUSCL with second-order precision, the non-structural, self-adaptable mesh technique, and the finite volume form. The results show that the shock wave flow field is uniform and steady with good waveform when the explosion wave on the primary-secondary basis runs into the target region. Desired overpressure and duration of the shock wave could be obtained if the explosive energy of the driver section is properly increased. Source


Ding X.-B.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Ding X.-B.,Harbin Institute of Technology | Zhang C.,Henan University of Science and Technology | Ming Z.-Q.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Xu J.-M.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

In large-scale geomechanical model, because of the fragility and low strength of similar model material, it is difficult to get its complete bending stress-strain curve or load-displacement curve. This paper performed mechanical analysis on the bending experiment process, and got the stiffness designing principle of elastic element through some derivation for the solution of increasing the auxiliary elastic element. Based on this principle, we assembled a test prototype and obtained complete bending load-displacement curves for the specimens with different joints (homogeneous, layered and massive) containing different angles bolt. In addition, the dead weight of specimen was considered in the experiment due to the similar material's characteristics of low strength and bulk density. Experimental studies have shown that, the increasement of elastic element has a noteworthy improvement for the decreasing segment of the complete bending load-displacement curve. When the composite stiffness of the elastic element and prototype system is greater than the maximum stiffness of the specimen, the curve can be measured. The dead weight of specimen can be equivalent to the concentrated force in the bending experiment, and the equivalent load for the 550 mm long Standard specimen is 50% of its own weight or 9% of the peak load in homogeneous specimen's experiment. Source


Wu J.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Yang Y.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Zhuang T.-S.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Zhuang T.-S.,PLA University of Science and Technology
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants | Year: 2016

To further reveal the action mechanism and damage effect characteristics of underwater explosion, the progresses of study on the action mechanism and damage effect of underwater explosion were systematically reviewed from six aspects as mechanism, shock wave propagation, bubble pulsation, damage effect and dynamic response of structure, test technology and numerical simulation and damage assessment for underwater explosion of different explosives. Some key technical problems which should be investigated or solved in future including energy release and diffusion of the underwater explosion of non-ideal explosive, damage of coupling action of shock wave and air bubble to structure and damage assessment methods for underwater explosion, multi-scale simulation technology for underwater explosion were proposed. © 2016, Editorial Board of Journal of Explosives & Propellants. All right reserved. Source


Yu S.-J.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Chen X.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Yang J.-X.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011

In order to measure the dynamic strain in concrete in impact or explosive test, a fiber Bragg grating (FBG) sensor specially designed for inner strain measurement in concrete was developed. The concrete specimens in which the FBG sensors were embedded were prepared and tested under impact on split Hopkinson pressure bar (SHPB). The inner and surface strains were measured by FBG sensors and strain gauges separately and an attempt to construct the dynamic relationship between stress and strain with the data was made. The analyses of the results show that the method of strain measurement in concrete with embedded FBG sensors is feasible and more reasonable if the measurements of accurate strains and exact performance of concrete are demanded. The FBG sensors were proved to be suitable for dynamic strain measurement in concrete and can be widely used in concrete and rock in their dynamic performance tests and response measurements under impact or explosive loads. Source

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