No 208 Research Institute of China Ordnance Industries

Beijing, China

No 208 Research Institute of China Ordnance Industries

Beijing, China
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Wang J.-S.,Changchun University of Science and Technology | Niu J.,No 208 Research Institute Of China Ordnance Industries | Wang M.,NO. 63856 Peoples Liberation Army Troops | Hu M.,Changchun University of Science and Technology
Guangzi Xuebao/Acta Photonica Sinica | Year: 2014

In order to meet wide-field, high image quality and easy portability of infrared detection equipments, a large field transmissive infrared collimator system with working band of 8~14 μm, full field ≥24 °, aperture of 130mm was designed. A simple three-type telephoto lens structure and a non-spherical were used to solve the problem that how to balance the three transmission systems aberration. According to the theory of optical design optimization of multi-level system design, eventually a infrared transmissive collimator system was obtained, the MTF at 20 lp/mm was not less than 20%, distortion resolution rate infinity was less than 1% in the whole field of view and the position of each focal length corresponding to different wavelengths. The advantages are wide field of view, high resolution, good image quality and simple structure, which can provide high image quality, high-resolution infrared target source at infinity for a variety of infrared imaging, military infrared detection system performance parameters sights. A prototype application was developed and applied to verify alignment test. The results show that the prototype can get clear and accurate images to meet testing requirements.


Wen Y.,Nanjing University of Science and Technology | Xu C.,Nanjing University of Science and Technology | Wang H.,No 208 Research Institute Of China Ordnance Industries | Chen A.,Nanjing University of Science and Technology | Batra R.C.,Virginia Polytechnic Institute and State University
International Journal of Impact Engineering | Year: 2013

We study experimentally and computationally the penetration of a steel sphere into a block of ballistic gelatin for developing an improved understanding of the damage caused to human soft tissues when impacted by a blunt object moving at a moderately high speed. The gelatin is modeled as an isotropic and homogeneous elastic-plastic material that exhibits linear strain-hardening and obeys a polynomial equation of state. Pictures taken by a high speed camera help construct the tunnel formed in the gelatin that is found to compare well with the computed one. Furthermore, computed time histories of the pressure at a point agree well with the corresponding experimentally measured ones for small times. The computed time histories of the temporary cavity size agree well with the corresponding experimental ones. These agreements between test findings and computed results imply that the computational model can reasonably well predict significant features of the impact event. Effects of impact velocity and sphere diameter on damage caused to the gelatin have also been studied. © 2013 Elsevier Ltd. All rights reserved.


Lu Y.,Nanjing University of Science and Technology | Zhou K.-D.,Nanjing University of Science and Technology | He L.,Nanjing University of Science and Technology | Li J.-S.,No 208 Research Institute Of China Ordnance Industries | Huang X.-Y.,Unit 63856 of PLA
Binggong Xuebao/Acta Armamentarii | Year: 2015

The working condition of barrel forcing cone is worse during the firing process of small arms. To study the influence of the forcing cone angles on the stress of barrel forcing cone, the three-dimensional finite element models of barrel and projectile at different forcing cone angles are established, in which the structures of barrel and projectile, and nonlinear constitutive relations are considered. The effects of different forcing cone angles on the projectile engraving process are analyzed. The data of engraving resistance is obtained under the condition of different forcing cone angles. A response surface model of engraving resistance is established. The formula and the variation rules of projectile engraving resistance along with the forcing cone angle and engraving displacement are calculated based on the above data by using Hermite polynomial. A dynamic model of projectile engraving process is established in consideration of the engraving resistance. The engraving pressure during the projectile engraving process is solved by programming. The forcing cone angles among 0.11° and 1.13°, which satisfy the requirement of muzzle velocity of the projectile, are obtained, and then the best forcing cone angle of 0.56°, which could reduce the barrel stress to ensure the highest velocity and meet the design range of forcing cone angles in case of satisfying the interior ballistic behaviors, is got. © 2015, China Ordnance Society. All right reserved.


Guo J.,Nanjing University of Science and Technology | Xu J.-S.,Nanjing University of Science and Technology | Gao Y.-B.,No 208 Research Institute Of China Ordnance Industries | He Y.,Nanjing University of Science and Technology | Chen X.,Nanjing University of Science and Technology
Dandao Xuebao/Journal of Ballistics | Year: 2016

To study the fatigue damage evolution of NEPE propellant in controlled strain fatigue tests, the ratio of dissipated energy change-approach based on the distribution of dissipated energy was used to analyze the fatigue damage process. According to four strain-amplitudes, the uniaxial drawing fatigue test was conducted. The fatigue life and dissipated energy under different strain-amplitudes were obtained. The result shows that the energy approach can intuitively explain the damage accumulation in the process of fatigue damage. Plotting plateau value of ratio of dissipated-energy and fatigue life behave in a linear relation. The plateau value is highly dependent on the initial loading strain amplitude, and the plateau value increases with the strain amplitude. The accumulative rates of the damage increase with the strain levels for the adjacent loading cycles, but the fatigue life decreases relatively, and the mechanism of damage increasing between the adjacent loading cycles can be explained. © 2016, Editorial Board of Journal of Ballistics. All right reserved.


Wen Y.,Nanjing University of Science and Technology | Xu C.,Nanjing University of Science and Technology | Wang S.,No 208 Research Institute Of China Ordnance Industries | Batra R.C.,Virginia Polytechnic Institute and State University
Journal of the Mechanical Behavior of Biomedical Materials | Year: 2015

The impact response of body armor composed of a ceramic plate with an ultrahigh molecular weight polyethylene (UHMWPE) fiber-reinforced composite and layers of UHMWPE fibers shielding a block of ballistic gelatin has been experimentally and numerically analyzed. It is a surrogate model for studying injuries to human torso caused by a bullet striking body protection armor placed on a person. Photographs taken with a high speed camera are used to determine deformations of the armor and the gelatin. The maximum depth of the temporary cavity formed in the ballistic gelatin and the peak pressure 40. mm behind the center of the gelatin front face contacting the armor are found to be, respectively, ~34. mm and ~15. MPa. The Johnson-Holmquist material model has been used to simulate deformations and failure of the ceramic. The UHMWPE fiber-reinforced composite and the UHMWPE fiber layers are modeled as linear elastic orthotropic materials. The gelatin is modeled as a strain-rate dependent hyperelastic material. Values of material parameters are taken from the open literature. The computed evolution of the temporary cavity formed in the gelatin is found to qualitatively agree with that seen in experiments. Furthermore, the computed time histories of the average pressure at four points in the gelatin agree with the corresponding experimentally measured ones. The maximum pressure at a point and the depth of the temporary cavity formed in the gelatin can be taken as measures of the severity of the bodily injury caused by the impact; e.g. see the United States National Institute of Justice standard 0101.06-Ballistic Resistance of Body Armor. © 2015 Elsevier Ltd.


Wen Y.,Nanjing University of Science and Technology | Xu C.,Nanjing University of Science and Technology | Wang H.,No 208 Research Institute Of China Ordnance Industries | Chen A.,Nanjing University of Science and Technology | Batra R.C.,Virginia Polytechnic Institute and State University
CAMX 2014 - Composites and Advanced Materials Expo: Combined Strength. Unsurpassed Innovation. | Year: 2014

We experimentally and numerically analyze the impact response of ballistic gelatin behind armor comprised of a ceramic plate facing the incoming projectile with a fiber-reinforced composite backing. It is a surrogate model for studying injuries to human torso wearing body protection armor. Experiments were conducted to study the impact performance of each constituent of the armor. Pictures taken with a high speed camera were used to understand the deformation mechanisms in each component and the entire system. Material models used in LS-DYNA for numerically studying the problem are MAT59 for the ultrahigh molecular weight polyethylene fiber-reinforced composite, Johnson-Holmquist for the ceramic, and strain-rate dependent hyperelastic for the gelatin. Stress based delamination and composite failure criteria implemented in LS-DYNA are used to simulate the initiation and propagation of failure. It is found that the numerically computed bulge diameter in the fiber-reinforced composite agrees reasonably well with the experimental value but the computed bulge height is less than that found experimentally. The computed evolution of temporary cavity in the gelatin is similar to that seen in experiments. The maximum pressure at a point in the gelatin is indicative of the severity of the bodily injury caused by the impact.


Luo S.,Nanjing University of Science and Technology | Xu C.,Nanjing University of Science and Technology | Wang S.,No 208 Research Institute Of China Ordnance Industries | Wen Y.,Nanjing University of Science and Technology
Computer Methods in Biomechanics and Biomedical Engineering | Year: 2016

In the last few decades, various researches focus on the transient pressure in the behind armor blunt trauma. This paper presented a investigation on the transient pressure in the ballistic gelatin behind a soft body armor subjected to the impacting from three ammunitions. Experimental results show that three peaks appear on the pressure–time curves without taking into account the ammunition type and the impact velocity. Furthermore, numerical models of the test were created to compare modelling results to the pressure from the pressure gauges buried in the gelatin block. The main features on the pressure–time cure were discussed to analyze the wave formation and propagation. With the verified model, the effect of the boundary was also investigated to explain the wave reflection which appeared after two peaks. © 2016 Informa UK Limited, trading as Taylor & Francis Group


Zou Y.,Nanjing University of Science and Technology | Xu C.,Nanjing University of Science and Technology | Zhang K.,No 208 Research Institute Of China Ordnance Industries
Binggong Xuebao/Acta Armamentarii | Year: 2015

The matching of alterable caliber rifle is the key problem of the development of alterable caliber modularized rifle system. The numerical simulation models are established for 5.8 mm and 7.62 mm caliber rifles, and the numerical simulation models are verified by comparing the simulation results with the experimental results. The kinetic characteristic matching of bolt carrier, the ammunition feed matching and the ejection matching are analyzed based on the models. The matched-degree principle of the bolt carrier's kinetic characteristic matching is built, and according to this principle, a reasonable design project is selected. The result shows that the kinetic characteristic matching of the bolt carrier can be achieved well by changing the diameter of the gas chamber; the stability of ammunition feed and the ammunition feed matching can be improved by changing the angle of ammunition feed slope and the rounding edges; and the change in the position of the ejection port is an efficient measure of ejection matching. © 2015, China Ordnance Society. All right reserved.


PubMed | Nanjing University of Science and Technology, Virginia Polytechnic Institute and State University and No 208 Research Institute Of China Ordnance Industries
Type: | Journal: Journal of the mechanical behavior of biomedical materials | Year: 2015

The impact response of body armor composed of a ceramic plate with an ultrahigh molecular weight polyethylene (UHMWPE) fiber-reinforced composite and layers of UHMWPE fibers shielding a block of ballistic gelatin has been experimentally and numerically analyzed. It is a surrogate model for studying injuries to human torso caused by a bullet striking body protection armor placed on a person. Photographs taken with a high speed camera are used to determine deformations of the armor and the gelatin. The maximum depth of the temporary cavity formed in the ballistic gelatin and the peak pressure 40mm behind the center of the gelatin front face contacting the armor are found to be, respectively, ~34mm and ~15MPa. The Johnson-Holmquist material model has been used to simulate deformations and failure of the ceramic. The UHMWPE fiber-reinforced composite and the UHMWPE fiber layers are modeled as linear elastic orthotropic materials. The gelatin is modeled as a strain-rate dependent hyperelastic material. Values of material parameters are taken from the open literature. The computed evolution of the temporary cavity formed in the gelatin is found to qualitatively agree with that seen in experiments. Furthermore, the computed time histories of the average pressure at four points in the gelatin agree with the corresponding experimentally measured ones. The maximum pressure at a point and the depth of the temporary cavity formed in the gelatin can be taken as measures of the severity of the bodily injury caused by the impact; e.g. see the United States National Institute of Justice standard 0101.06-Ballistic Resistance of Body Armor.


Cao H.-S.,North University of China | Zhang H.-S.,North University of China | Yuan D.-W.,No 208 Research Institute Of China Ordnance Industries | Ma B.-C.,North University of China | Chen Y.,No 208 Research Institute Of China Ordnance Industries
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology | Year: 2015

In order to produce the focused fragments, the transmission theory of detonation wave and numerical simulation method were utilized to analyze the influence of different initiation styles on fragments emission of circle-arc focused warhead. The results of theoretical calculation and numerical simulations show that the initiation styles heavily influence the fragments emission of circle-arc focused warhead. Different initiation styles generate different incident angles, which will affect the deflection angle and velocity of focused fragments, and finally influence the destroy effect. The results can provide reference for air defense and anti-missile warhead design. © 2015, Editorial Department of Transaction of Beijing Institute of Technology. All right reserved.

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