China Academy of Engineering Physics is founded in October, 1958. It is the research and manufacturing center of Chinese nuclear weapons. CAEP was initially located in Beijing. Its major departments were later relocated to Qinghai Province. In 1970, the major components moved to Sichuan Province. The Academy was formerly named Ninth Institute of Second Ministry of Mechanical Industry, and Ninth Institute of Ministry of Nuclear Industry. It was later renamed CAEP. In China, the Ninth Institute is still well recognized. Its headquarters is in the 839 area of Mianyang, which covers a land area of 5 km2. It's nicknamed Scientific Town. It has multiple branches in Beijing, Jiangyou, Chengdu and Shanghai. The Academy currently has 12 research institutes and 15 national key laboratories. Its research areas include shock wave and explosive physics, nuclear and plasma physics, engineering and material science, electronics and photo-electronics, radioactive chemistry and chemical engineering, computer science and computational mathematics, etc. CAEP has over 8,000 researchers and technicians. Some prominent Chinese scientists used to be leaders of the academy, including Yu Min, Wang Ganchang, Deng Jiaxian, Zhu Guangya, Chen Nengkuan, Zhou Guangzhao, Guo Yonghuai, Cheng Kaijia, and Peng Huanwu. It currently has 9 academicians of Chinese Academy of science , and 7 academicians of Chinese Academy of Engineering , and a number of outstanding scientists. Wikipedia.
Zhang Q.,China Academy of Engineering Physics |
Shreeve J.M.,University of Idaho
Chemical Reviews | Year: 2014
The paper presents a review of energetic ionic liquids (EILs) including history, syntheses, properties, and applications in the fields of energetic materials. The main aim of this work is to present the latest advances of EILs as new energetic materials and to emphasize the new possibilities and the future challenges in this field. A new research field of utilizing the reactivity of EILs for bipropellant applications has opened up with the discovery of the IL hypergols. It has been observed that different substituents and energy-containing groups can significantly influence the properties and performance of EILs such as melting point, energy density, thermal stability, detonation properties, and sensitivity. The dual-functional strategy can also allow the independent design of the structures of both cation and anion, making the energetic performance and safety issues of the final EILs reasonably predictable.
Yang R.-C.,China Academy of Engineering Physics
Optics and Lasers in Engineering | Year: 2014
A nonlinear Tikhonov regularization scheme is developed to tackle the ill-posed finite-element digital image correlation, which aims to measure the displacement field from consequent digital images before and after deformation. The goal of this algorithm is to resolve the displacement field with fine and irregular structure without deteriorated by the measuring errors due to its ill-posedness. A Newton-type method is employed to linearize the nonlinear problem iteratively, then the Tikhonov regularization is applied to the linearized problem, with the regularization parameter adaptively chosen by the L-curve method. The proposed algorithm is verified by computer simulated input images with a priori displacement field. The result shows that it is capable of resolving displacement field with very fine structure in a reasonable accuracy. © 2014 Published by Elsevier Ltd.
Li S.-M.,China Academy of Engineering Physics
Gongcheng Lixue/Engineering Mechanics | Year: 2013
For dam transient analysis subjected to horizontal ground excitations and based on the scaled boundary finite element method (SBFEM), a dynamic stiffness of semi-infinite reservoir with constant cross section was proposed, which was evaluated by the Bessel function. Based on the dynamic stiffness, a SBFEM and finite element method (FEM) coupling equation was developed to analyze transient responses of semi-infinite reservoir with arbitrary geometry under horizontal ground excitations, where the semi-infinite reservoir was divided into two parts: near field and far field (semi-infinite reservoir with constant cross section). The near field with arbitrary geometry was discretized by FEM, while the far field was modeled by the SBFEM. Through comparing the calculation efficiency of the dynamic stiffness matrix and that of the dynamic mass matrix, it was found that the calculation efficiency of the dynamic stiffness matrix was higher than that of the dynamic mass matrix, and both of them had the same accuracy. Numerical examples showed the accuracy of the developed dynamic stiffness matrix and its coupled equation.
Zhang C.,China Academy of Engineering Physics
Journal of Physical Chemistry C | Year: 2010
The desensitizing mechanism of amorphous olefin in a typical explosive HMX against external mechanical stimuli was investigated by loading uniaxial compression and shear on four cells composed of pure HMX, pure olefin, HMX + 3 wt % olefin, and HMX + 9 wt % olefin, respectively. As a result, it was confirmed that the mechanism under the loading conditions is predominantly attributed to the good lubricating property of olefin, which can greatly reduce shear stress denoted by shear sliding barriers. At the same time, the addition of a little olefin in HMX, for example, below 10 wt %, cannot obviously improve the compressibility of HMX-based explosives. It therefore indicates the lowered mechanical sensitivity is not caused by improving compressibility. In addition, my simulations did not show that the more olefin added in HMX results in the more evident desensitizing effect, suggesting a critical point of the component of HMX + olefin corresponding to a lowest shear stress. © 2010 American Chemical Society.
Li J.,China Academy of Engineering Physics
Journal of Hazardous Materials | Year: 2010
The ZPE-corrected N-NO2 bond dissociation energies (BDEsZPE) of a series of model N-nitrocompounds and typical energetic N-nitrocompounds have been calculated using density functional theory methods. Computed results show that using the 6-31G** basis set the UB3LYP calculated BDEZPE is similar to the B3PW91 but is less than the UB3P86 and that for both UB3P86 and UB3PW91 methods the 6-31G** calculated BDEZPE is close to the 6-31++G**. For the series of model N-nitrocompounds it is drawn from the NBO analysis that at the UB3LYP/6-31G** level the order of BDEZPE is not only in line with that of bond order but also with that of the energy gap between N-NO2 bond and antibond orbitals. For the typical energetic N-nitrocompounds the impact sensitivity is strongly related to the BDEZPE indeed, and based on the BDEsZPE calculated at different density functional theory levels this work has established a good multivariate correlation of impact sensitivity with molecular parameters, which provides a method to address the sensitivity problem. © 2009 Elsevier B.V. All rights reserved.