Xu Y.,Beijing Institute of Technology |
Wang S.,Beijing Institute of Technology |
Yan W.,Beijing Institute of Technology |
Guo Z.,China North Industries Group Corporation Institute 53
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2012
The defense performance of sandwich structure of steel plate-fiber composite material plate-steel plate structure against fragment was investigated. By the experiment on the fragment simulation projectile (FSP), impacted to different kinds of sandwich plate with high velocity, the ballistic limits of fragment pierced 16 kinds of sandwich plates were obtained, and the influence of structure characteristic on the specific energy absorption of the sandwich plate was analyzed. The results show that the specific energy absorption of laminated sandwich structure on aramid and glass fiber is 8.31% and 16.09% higher than that of a single-layer structure, respectively. The specific energy absorption of the sandwich structure with 8 mm front+8 mm core+6 mm back on aramid and glass fiber is 37.72% and 25.35% higher than the one with 4 mm front+8 mm core+10 mm back, respectively. The specific energy absorption of sandwich plate exponentially increases with the thickness of fiber composite sandwich. The tensile properties of middle layer plate is an important factor on the specific energy absorption of the sandwich plate. At the same areal density, the specific energy absorption of the sandwich plate can be significantly improved by adopting thicker faceplate, thinner backboard and laminated structure for middle layer.
Guo Z.-R.,China North Industries Group Corporation Institute 53 |
Du W.-Z.,Military Representative Office of Armored Forces in Jinan |
Zhong W.-H.,China North Industries Group Corporation Institute 53 |
Jin Z.-M.,China North Industries Group Corporation Institute 53 |
And 2 more authors.
Binggong Xuebao/Acta Armamentarii | Year: 2010
The anti-perforation performance of aramid composite made by aramid fiber reinforced polyurethane against 2.05 g tungsten ball, 1.03 g steel ball and 4.50 g steel ball was studied in this paper. And the difference of anti-perforation performance of it against three different kinds of representative balls above was also discussed. The results show that the anti-perforation performance of aramid composite varies with the bullets. The anti-perforation performance was lower for 2.05 g tungsten balls, and higher for 1.03 g steel balls, while in the middle for 4.50 g steel balls. Moreover, a new method which is called specific energy absorption per direct effect area (PSEA) was put forward for expressing the anti-perforation performance of aramid composites against different kinds of the spheric projectiles. The experiment result shows that PSEAs are almost the same when the aramid composite is impacted by the same kind of spheric projectiles. The PSEA was lower for tungsten balls than for steel spheres, which may be used in calculating the ballistic limit velocity of aramid composite against the other spheric projectiles. And the validation result shows that the ballistic limit velocity calculated by PSEA differs with the test results about 1% to 6%.
Meng X.,China North Industries Group Company Institute 53 |
Wei L.,China North Industries Group Company Institute 53 |
Liu Y.,China North Industries Group Company Institute 53 |
Zhou Y.,China North Industries Group Company Institute 53 |
And 4 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2013
PA66 with different aged time was characterized by dynamic mechanical analysis (DMA). The mechanisms of DMA analysis were identified with the results of DSC curves and impact strength test. The results indicate that dynamic parameters such as loss tangent, storage modulus and storage compliance have a regular change along with the prolongation of aged time. The maximum temperature of main relaxation loss tangent increases first and then decreases, and becomes stable at the last stage of thermal aging. The storage compliance constantly decreases with the prolongation of aged time. It is a practicable way to characterize the aging-resistant performance of polymer by DMA analysis, moreover the polymers aging mechanism can be concluded according to molecular movement and dynamic parameters.
Yu K.,Shandong University |
Zhu B.,Shandong University |
Wang Q.,China North Industries Group Corporation Institute 53 |
Liu H.-Z.,Shandong University |
And 2 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2013
The AN-IA copolymer was modified by ammoniation and the structure of AN-IA copolymer after modification was characterized, the effect of ammoniation modification on the final performance of carbon fiber was studied. The results showed the infrared spectrum was changed with the ratio of IA increasing in some way, the moderate broad peaks appeared at 1730 and 1700 cm-1 and the intensity of peaks increased. The oxygen content of preoxided fiber which prepared by ammoniation modified AN-IA copolymer was over 11%, the pre-oxidization ability significantly improved, and the intensity of carbon fiber after final carbonization can reach 3.76 GPa.
Zhao X.,China North Industries Group Corporation Institute 53 |
Gong W.,China North Industries Group Corporation Institute 53 |
Ji K.,China North Industries Group Corporation Institute 53 |
Deng W.,China North Industries Group Corporation Institute 53 |
And 2 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2015
Poly(aryl ether ketone) containing bisphenol A (BPA) was synthesized through a simple technology with the advantage of short reaction time, low energy consumption. The effects of the monomer ratio, polymerization reaction time, concentration, solvent on the polymerization were studied. The appropriate reaction conditions were determined, such as the monomer ratio of 1:1, the polymerization reaction time of 2.5h, N-methyl pyrrolidone as solvent, and the solid content o f 25%. The effects of the monomer ratio on thermal properties of the polymer were also studied. When the monomer mole ratio is 1:1, the glass transition temperature of the polymer and mass loss temperature are higher. ©, 2015, Chengdu University of Science and Technology. All right reserved.