Results 21 to 30 of about 520 (213)

Investigations of the mechanical response of dummy HTPB propellant grain under ultrahigh acceleration overload conditions using onboard flight-test measurements

Defence Technology
In this paper, to study the mechanical responses of a solid propellant subjected to ultrahigh acceleration overload during the gun-launch process, specifically designed projectile flight tests with an onboard measurement system were performed.
Yiming Zhang, Ningfei Wang, Weihua Ma, Ran Wang, Long Bai, Yi Wu   +5 more
doaj   +1 more source

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  

Position Normalization of Propellant Grain Point Clouds

Aerospace
Point cloud data obtained from scanning propellant grains with 3D scanning equipment exhibit positional uncertainty in space, posing significant challenges for calculating the relevant parameters of the propellant grains.
Junchao Wang, Fengnian Tian, Renfu Li, Zhihui Li, Bin Zhang, Xuelong Si   +5 more
doaj   +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

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 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