Results 31 to 40 of about 7,425 (303)

Effect of cyclic loads on structural damage of rocket propellant grain [PDF]

Scientific Technical Review, 2019
Rocket motor propellant grain, cast or bonded into the motor chamber or solid coating, is exposed to various loads during its service life. Rocket propellant is a viscoelastic material, whose mechanical properties strongly depend on temperature and ...
Gligorijević Nikola, Rodić Vesna, Pavković Bojan, Bogdanov Jovica, Živković Saša, Bajić Zoran   +5 more
doaj  

Nanosized Sodium-Doped Lanthanum Manganites: Role of the Synthetic Route on their Physical Properties

, 2003
In this paper we present the results of the synthesis and characterisation of nanocrystalline La1-xNaxMnO3+delta samples. Two synthetic routes were employed: polyacrylamide-based sol-gel and propellant synthesis.
Balcells L., Balcells L., Boix T., Causa M. T., Coey J. M. D., Douy A, Gupta A., Helman J. S., Herrero E., Horyn R., Hwang H. Y., Li R.-W., Li X.-H., Mahendiran R., Malavasi L., Malavasi L., Mathur N. D., Muori M., Nagata K., Ng-Lee Y., Oseroff S. B., Pechini M. P. U.S., Ritter C., Roy S., Sanchez R. D., Shannon R. D., Singanahally T. A., Spinolo G., Tonejc A. M., Töpfer J., van Roosmalen J. A. M.   +30 more
core   +1 more source

Thermal and acceleration load analysis of new 122 mm rocket propellant grain [PDF]

Scientific Technical Review, 2016
In order to achieve very strong inter-ballistic requirements, a unusual free standing rocket motor propellant grain was designed, with variable channel diameter.
Gligorijević Nikola, Antonović Saša, Živković Saša, Pavković Bojan, Rodić Vesna   +4 more
doaj  

Mechanical properties of thermal aged HTPB composite solid propellant under confining pressure

Defence Technology, 2022
With the purpose of investigating the effects of confining pressure and aging on the mechanical properties of Hydroxyl-terminated polybutadiene (HTPB) based composite solid propellant, tensile tests of thermal accelerated aged propellant samples under ...
Zhe-jun Wang, Hong-fu Qiang
doaj   +1 more source

Fatigue Crack Initiation and Growth in Nanocrystalline Ni at Multiple Length‐Scales

Advanced Engineering Materials, EarlyView.
Overview of miniaturized in situ SEM fatigue setup and resultant fatigue crack growth data for nanocrystalline Ni. The presented study focuses on the analysis of fatigue crack growth rate (FCGR) in focused ion beam‐notched microcantilevers prepared from nanocrystalline (NC) Ni as a model material.
Igor Moravcik, Alexander Jelinek, Markus Alfreider, Jutta Luksch, Anton Hohenwarter, Florian Schaefer, Christian Motz, Daniel Kiener   +7 more
wiley   +1 more source

Research on Solving the Structural Instability of Composite Propellants by Using Non-Ablative Cladding Layers

Aerospace
In a high-temperature test of the gas generator with a free-loading composite propellant, an abnormal jitter appeared in the latter part of the internal ballistic curve, whereas no such abnormality was observed in the low-temperature and normal ...
Gang Zhang, Mingming Zhan, Wen Feng, Youwen Tan, Yang Liu, Weihua Hui   +5 more
doaj   +1 more source

Study on the Ignition Process and Characteristics of the Nitrate Ester Plasticized Polyether Propellant

International Journal of Aerospace Engineering, 2020
In this study, a CO2 laser ignition experimental system was built to study the ignition process and characteristics of the Nitrate Ester Plasticized Polyether (NEPE) propellant.
Xiaoting Yan, Zhixun Xia, Liya Huang, Likun Ma, Xudong Na, Yunchao Feng, Chuanbo Fang   +6 more
doaj   +1 more source

Toward Stable Multivalent Metal Batteries: Understanding the Interfacial Chemistry for Magnesium and Calcium Metal Anodes

Advanced Functional Materials, EarlyView.
Interphase chemistry governs the stability of multivalent metal batteries. We summarize state‐of‐the‐art developments in calcium and magnesium metal batteries by focusing on the correlation among electrolytes, interphase layers, and the electrochemical performance of corresponding metal anodes.
Huijun Lin, Qi Meng, Juncai Long, Chuheng Cao, Zheng‐Long Xu   +4 more
wiley   +1 more source

On-line Monitoring of SRM Grain Structure Based on embedded FBG Sensor

MATEC Web of Conferences, 2019
This paper proposes the use of FBG (Fiber Bragg grating) sensors for SRM (Solid Rocket Motor) grain structure continuous Structural Health Monitoring(SHM) as they are generally considered as the preferable solution in flammable and explosive environments,
Zhang Lei, Chang Xin-Long, Zhang You-hong, Chen Xiang-dong, Zhang Qing   +4 more
doaj   +1 more source

Structural Integrity Analysis of Nozzleless Booster Propellant Grain in the Process of Curing and Cooling [PDF]

Hangkong bingqi
In order to accurately evaluate the structural integrity level of the solid rocket ramjet nozzleless booster propellant grain during curing and cooling, the structural integrity of the nozzleless booster propellant grain of a solid rocket ramjet engine ...
Kui Bin, Liu Qiang, Na Xudong, Liu Jue
doaj   +1 more source