scholarly journals Effect of Reinforcement Fiber Arrangement on Thermal and Mechanical Properties of High Silica/Phenolic Resin Insulation Layer

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Weihua Hui ◽  
Jinhang Wen ◽  
XiaoMin Bu
Keyword(s):  
Mechanical Properties ◽  
Phenolic Resin ◽  
Thermal Conditions ◽  
Thermal And Mechanical Properties ◽  
Insulation Layer ◽  
Rocket Motors ◽  
Firing Test ◽  
Reinforcement Fiber ◽  
High Silica ◽  
Solid Rocket

The failure of the high silica/phenolic resin insulation layer under extreme thermal conditions has become an important reason for the trouble of solid rocket motors. A great number of studies have shown that the arrangement of reinforcement fibers is a significant factor in the failure of fiber-reinforced plastic. In this paper, the thermal and mechanical properties of the high silica/phenolic resin insulation layer with different arrangements were analyzed, and the causal relationship between the failure of the insulation layer and the arrangement of reinforcement fibers was given. Two types of heat-insulating layers with strong arrangement and weak arrangement were designed. After the SRM firing test, it is concluded that the essential reason for the failure of the insulation layer is the strength anisotropy caused by the weak arrangement of reinforcement fibers. Besides, the reinforcement fibers of strong arrangement are distributed in all directions, which compensates for the axial strength defects of the weakly arranged insulation layer.

scholarly journals Effect of the fluid–structure interaction on solid rocket motors instabilities

2012 ◽  
Author(s):  
J. Richard ◽  
T. Morel ◽  
F. Nicoud
Keyword(s):  
Solid Propellant ◽  
Gas Flow ◽  
Solid Rocket Motors ◽  
Rocket Motors ◽  
Firing Test ◽  
Solid Propellant Rocket ◽  
Acoustic Instabilities ◽  
Solid Rocket ◽  
Coupling Algorithm ◽  
Propellant Rocket

Large solid propellant rocket motors may be subjected to aero-acoustic instabilities arising from a coupling between the burnt gas flow and the acoustic eigenmodes of the combustion chamber. Given the size and cost of any single firing test or launch, it is of first importance to predict and avoid these instabilities at the design level. The main purpose of this paper is to build a numerical tool in order to evaluate how the coupling of the fluid flow and the whole structure of the motor influences the amplitude of the aeroacoustic oscillations living inside of the rocket. A particular attention was paid to the coupling algorithm between the fluid and the solid solvers in order to ensure the best energy conservation through the interface. A computation of a subscaled version of the Ariane 5 solid propellant engine is presented as illustration.

Study on Thermal and Mechanical Properties of Polyurethane Systems for In-Mould Decoration Ink

2014 ◽  
Vol 881-883 ◽  
pp. 850-853
Author(s):  
Jing Lin ◽  
Cheng Zheng ◽  
Shu Xuan Qian ◽  
Xian Fang Cai ◽  
Yong Shun Lan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Sorption ◽  
Phenolic Resin ◽  
Cross Linking ◽  
Thermal And Mechanical Properties ◽  
Elongation At Break ◽  
Swell Ratio ◽  
System A ◽  
Gel Fraction ◽  
The Cross

In this study, three polyurethane systems A (A450/RD181/L75), B(A450/RD181/N3390) and C(A450/RD181/2104/N3390) for in-mould decoration ink were studied. The results of thermogravimetric analysis showed that introducing rosin modified phenolic resin 2104 (RMPR) and N3390 into PU system A can improve the thermal stability, Moreover, Measurements of gel fraction and swell ratio showed that incorporation of N3390 is benificial for increasing the cross-linking density of PU systems as compared to L75 so as to increase the gel fraction and decrease the swell ratio.The tensile strength of cured PU systems increased following in the order: A<B<C, elongation at break is just the opposite. In addition, it is indicated that incorporation of N3390 is benificial for increasing the cross-linking density of PUs so as to improve the the shore A hardness and decease the water sorption.

Thermal and Mechanical Properties of Boron-Containing Bisphenal-A Formaldehyde Resin Composites

2010 ◽  
Vol 150-151 ◽  
pp. 877-880
Author(s):  
Jun Gang Gao ◽  
Xing Li ◽  
Bei Bei Sun
Keyword(s):  
Mechanical Properties ◽  
Bisphenol A ◽  
Surface Resistance ◽  
Phenolic Resin ◽  
Volume Resistivity ◽  
Formaldehyde Resin ◽  
Resin Composites ◽  
Thermal And Mechanical Properties ◽  
Fiber Glass ◽  
Residual Rate

Boron-containing bisphenol-A formaldehyde resin (BBAFR) with different amounts of boron was synthesized from bisphenol-A, formaldehyde solution and boric acid. The fiber-glass reinforced laminates were prepared. The thermal, electric and mechanical properties were determined. The results show that the BBAFR has a better thermal stablitity. The residual rate of BBAFR is 18% at 900 oC, which is higher 300 oC than ordinary phenolic resin. The tensile strength of BBAFR fiber-glass laminates is higher 19.07MPa than ordinary phenolic resin fiber-glass laminates. The volume resistivity and surface resistance of BBAFR laminates increased, but the dielectric loss tanδ and dielectric constant ε decreased.

Erosion Study of Silica Phenolic Nozzles with Graphite Inserts in Solid Rocket Motors

2015 ◽  
Vol 1095 ◽  
pp. 573-578 ◽  
Author(s):  
Xiong Chen ◽  
Rui Liu ◽  
Hong Ying Du
Keyword(s):  
Erosion Rate ◽  
Diffusion Rate ◽  
Diffusion Mechanism ◽  
Upward Trend ◽  
Solid Rocket Motors ◽  
Rocket Motors ◽  
Erosion Rates ◽  
Firing Test ◽  
Solid Rocket ◽  
Experimental And Theoretical Studies

Experimental and theoretical studies on the erosion of silica phenolic nozzles with graphite inserts in solid rocket motors were carried out. Two identical segmented nozzles, consisting of graphite inserts and silica phenolic insulation in the convergent and divergent sections, were tested at same operating condition. Due to the different thermal resistance ability, steps are formed at the interface of two materials. The erosion rates, following the distribution of Reynolds number, exhibit an upward trend in the convergent section and decrease in the divergent section for both silicon phenolic and graphite. At high temperature, the graphite erosion rate is limited by the diffusion rate of the oxidizing species,while the erosion rate is limited by the chemical kinetics at low temperature. For the graphite nozzle insert, a switch from kinetics mechanism to diffusion mechanism occurs in the convergent section during the firing test.

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