Effects of Different Size and Shaped Magnesium Particles on the Properties for Fuel Rich Solid Propellant

2013 ◽  
Vol 634-638 ◽  
pp. 1918-1921 ◽  
Author(s):  
Lin Quan Liao ◽  
Wei Qiang Pang ◽  
Hui Xiang Xu ◽  
Yong Hong Li ◽  
Xue Zhong Fan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Rheological Properties ◽  
Burning Rate ◽  
Solid Propellant ◽  
Spherical Particles ◽  
Chemical Characteristics ◽  
Rate Performance ◽  
Percent Elongation ◽  
Lower Viscosity

The physic-chemical characteristics of spherical and coarse magnesium particles were determined. The rheological properties of Mg/HTPB mixtures were investigated. The burning rate performance and mechanical properties of fuel rich propellant were evaluated. The results show that the spherical magnesium particles could be dispersed in the HTPB binder with lower viscosity and yield stress than those of the coarse ones. The burning rate and pressure exponent of propellant with spherical particles increased compared with the coarse ones, and the percent elongation is much higher than that of coarse one, whereas, the tensile strength shows reverse.

Effect of Li on Mechanical Properties and Electrical Conductivity of the Al–Zn–Cu–Mg Based Alloys

2021 ◽  
Vol 21 (9) ◽  
pp. 4897-4901
Author(s):  
Hyo-Sang Yoo ◽  
Yong-Ho Kim ◽  
Hyeon-Taek Son
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Grain Size ◽  
Tensile Strength ◽  
Spherical Particles ◽  
Al Alloy ◽  
High Angle ◽  
Average Grain Size ◽  
Strength Improvement ◽  
Li Content

In this study, changes in the microstructure, mechanical properties, and electrical conductivity of cast and extruded Al–Zn–Cu–Mg based alloys with the addition of Li (0, 0.5 and 1.0 wt.%) were investigated. The Al–Zn–Cu–Mg–xLi alloys were cast and homogenized at 570 °C for 4 hours. The billets were hot extruded into rod that were 12 mm in diameter with a reduction ratio of 38:1 at 550 °C. As the amount of Li added increased from 0 to 1.0 wt.%, the average grain size of the extruded Al alloy increased from 259.2 to 383.0 µm, and the high-angle grain boundaries (HGBs) fraction decreased from 64.0 to 52.1%. As the Li content increased from 0 to 1.0 wt.%, the elongation was not significantly different from 27.8 to 27.4% and the ultimate tensile strength (UTS) was improved from 146.7 to 160.6 MPa. As Li was added, spherical particles bonded to each other, forming an irregular particles. It is thought that these irregular particles contribute to the strength improvement.

scholarly journals Karakteristik Bioplastik dari Pati Buah Lindur (Bruguiera gymnorrizha)

2018 ◽  
Vol 7 (1) ◽  
pp. 49-59
Author(s):  
Johan Budiman ◽  
Rodiana Nopianti ◽  
Shanti Dwita Lestari
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Tensile Strength ◽  
Degradation Rate ◽  
Water Resistance ◽  
Block Design ◽  
Percent Elongation ◽  
Starch Concentration ◽  
Randomized Block Design ◽  
Biodegradation Test

This research studied the characteristics of bioplastic from large-leafed mangrove (Bruguiera gymnorrizha) starch. This research was arranged used Randomized Block Design (RBD) model, with different starch concentration (0.5%, 1%, 1.5% and 2%) as treatment. The parameters observed were mechanical properties (tensile strength and percent elongation), thickness, water uptake and biodegradation test. The result showed that the starch concentration was not significant, (P>0.05) affected tensile strength and water resistance. Different between treatments was observed as for elongation, thickness and biodegradation test significant (P<0.05). The results obtained from the bioplastic research of large-leafed mangrove starch for tensile strength ranged from 24.59 MPa – 32.91 MPa, percent elongation 2.93% – 4.88%, thickness 0.05 mm – 0,11 mm, water resistance 108.06% – 111.09% and biodegradation test with percent weight loss 17.91% – 54.40% with the highest degradation rate 18.13 – 3.62 mg /15 days burial. The best treatment was obtained by using 1,5% starch, 4 g chitosan and 15% glycerol or equal to starch : chitosan 1.5 g : 4 g and 0.9 mL glycerol.

Mixtures of Recycled Milk Pouches with a Virgin LDPE-LLDPE Blend

2005 ◽  
Vol 21 (3) ◽  
pp. 219-230 ◽  
Author(s):  
Arup Choudhury ◽  
Mandira Mukherjee ◽  
Basudam Adhikari
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Rheological Properties ◽  
Melt Flow Index ◽  
Flow Index ◽  
Thermal And Mechanical Properties ◽  
Melt Flow ◽  
Recycled Materials ◽  
Elongation At Break

The present investigation deals with the viability of the use of recycled milk pouch material, which is a 50:50 mixture of LDPE and LLDPE, and the scope for improvement of its properties by combining it with virgin LDPE-LLDPE (50/50). Melt flow index (MFI), rheological properties, thermal and mechanical properties of the pure materials and their formulated blends containing recycled milk pouches were studied. The properties of the recycled materials were not as satisfactory as those of the corresponding virgin materials. But a significant improvement in viscosity, crystallinity, tensile strength and elongation at break of the recycled LDPE-LLDPE material was achieved by blending it with the corresponding virgin LDPE-LLDPE blend.

scholarly journals Reinforcing high-density polyethylene by phenolic spheres

2018 ◽  
Vol 238 ◽  
pp. 05003
Author(s):  
Lien Zhu ◽  
Di Wu ◽  
Baolong Wang ◽  
Jing Zhao ◽  
Meihua Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Composite Materials ◽  
Impact Strength ◽  
Rheological Properties ◽  
High Density Polyethylene ◽  
High Density

Phenolic spheres are synthesized through resorcinol and formaldehyde. The phenolic spheres were blended with HDPE to prepare binary composites. The rheological properties and mechanical properties of the composites were studied. The composite materials have higher tensile strength and impact strength than pure HDPE, which extends the application of the material.

Development of Hypereutectoid Steel with Nodular Graphite

2010 ◽  
Vol 457 ◽  
pp. 132-136
Author(s):  
Dmytry S. Kozak
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Strength ◽  
Yield Strength ◽  
Brinell Hardness ◽  
Hypereutectoid Steel ◽  
Percent Elongation ◽  
Nodular Graphite ◽  
Free Cementite

This work studies the formation of cast structures in hypereutectoid steel modified by alloying modifiers (Fe30Si55Mg7Ca2REM4, Fe34Si55Mg9Ca2 and Fe63Ni30Mg7) together with inoculants Fe20Si60Ba20. It is found that at spheroidizing by 0.7 % Fe63Ni30Mg7 and inoculation by 1.5 % Fe20Si60Ba20 causes the formation of inclusions of nodular graphite with nodularity exceeding 90 % and a structurally-free cementite structure is obtained. The mechanical properties of the steel with nodular graphite modified by Fe63Ni30Mg7 and Fe20Si60Ba20 are as follows: tensile strength (σb) 660-680 МPа, yield strength (σ0.2) 520-540 МPа, percent elongation (δ) 5-8 %, impact strength (КС) 15-35 J/cm2, Brinell hardness (НВ) 241-255. After ferritic annealing these parameters were found to be σb =530-560 МPа, σ0.2=400-430 МPа, δ =20-24 %, КС=160- 180 J/cm2, 150-162 НВ.

EFFECT OF INCREASING NCO/OH MOLAR RATIO ON THE CHEMICAL AND MECHANICAL PROPERTIES OF ISOCYANATE TERMINATED POLYURETHANE PREPOLYMER DERIVED FROM BIO-MASS

2016 ◽  
Vol 2 (2) ◽  
pp. 78-82
Author(s):  
K. Rathika ◽  
S. Begila David
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Castor Oil ◽  
Hard Segment ◽  
Molar Ratio ◽  
Curing Time ◽  
Percent Elongation ◽  
Hard Segment Content ◽  
Polyurethane Film ◽  
Polyurethane Prepolymer

The study deals the effect of increasing NCO/OH molar ratio on the physico-mechanical properties of isocyanate terminated polyurethane prepolymer. The prepolymer was prepared using castor oil and toluene-2,4-diisocyanate. The NCO/OH molar ratio has been varied from 1.6 to 2.0. The formation of the prepolymer was confirmed by UV and FTIR spectroscopy. The results reveal that the curing time of the prepolymer decreased with increase in NCO/OH molar ratio. When NCO/OH molar ratio increased, the tensile strength of the polyurethane film increased, while percent elongation decreased due to increase in hard segment content.

Influence of Solid Particle Size on Burning and Mechanical Properties of AP/Al/HTPB Composites

2012 ◽  
Vol 510-511 ◽  
pp. 500-506 ◽  
Author(s):  
Z. Mehmood ◽  
Mohammad Bilal Khan ◽  
T. Abbas ◽  
Nasir M. Ahmad
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Tensile Strength ◽  
Particle Size Distribution ◽  
Burning Rate ◽  
Size Distribution ◽  
Maximum Stress ◽  
Aluminum Particles ◽  
Tensile Tester ◽  
Coarse To Fine

Mechanical and ballistics properties are a measure of the performance of AP/Al/HTPB composites. These properties are influenced by the characteristics of inorganic crystalline oxidizer and aluminum particles. This paper reports the effect of the particle size distribution on mechanical and burning properties of 87% solid loaded composites. Composites were fabricated by mixing the ingredients in the planetary mixer followed by curing at an elevated temperature for several days. Multimodal particle size distribution was used in which coarse to fine ratio was varied proportionally. The burning rate was measured using strand burner at various pressures. Mechanical properties of the composites were investigated by using tensile tester. Results revealed that tensile strength and the burning rate increased while elongation at maximum stress decreased with the increase in the quantity of fines oxidizer. Whereas the variation in the particle size of the aluminum do not have any pronounced effect on the burning as well as mechanical properties of the composite.

scholarly journals Comparison Between Membrane Theory and Finite Elements Analyses for Domed Shells Edged by Support Ring Beam

2013 ◽  
Vol 6 (2) ◽  
pp. 1-8
Author(s):  
Ali A.Ali ◽  
Esam A.Ebrahim ◽  
Mohammed H.Sir ◽  
Barazan A.Hamah Said
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloys ◽  
Finite Elements ◽  
Shot Peening ◽  
Membrane Theory ◽  
Support Ring ◽  
Percent Elongation ◽  
Maximum Value ◽  
Hardening Factor

The present work devote the effect of shot peening time on the mechanical  properties for two aluminum alloys AA2017-T4 and AA6063-T5. The test carried out using standard tensile specimens under various shot peening times. The results showed that the increase in yield and tensile strength values. The maximum increasing at 15 minute for AA 2017-T4, and at 9 minute for AA 6063-T5. The maximum values of strain hardening factor (n) and strength factor (k) are recorded at 15 minute for AA 2017-T4 while recorded the maximum values of (n) at 24 minute and (k) at 9 minute for AA 6063-T5. The results showed that the percent elongation are increased to maximum value at 9 minute for AA 2017-T4 while the minimum value was at the same time for AA 6063-T5.

scholarly journals Effect of Microstructure on Micro-Mechanical Properties of Composite Solid Propellant

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1378
Author(s):  
Tianpeng Li ◽  
Jinsheng Xu ◽  
Junli Han ◽  
Yong He
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Solid Propellant ◽  
Volume Fraction ◽  
Elongation Rate ◽  
Breaking Elongation ◽  
Initial Modulus ◽  
Composite Solid Propellant ◽  
Composite Solid ◽  
Effect Of Microstructure

This study was aimed at determining the effect of microstructure on the macro-mechanical behavior of a composite solid propellant. The microstructure model of a composite solid propellant was generated using molecular dynamics algorithm. The correlation of how microstructural mechanical properties and the effect of initial interface defects in propellant act on the macro-mechanics were studied. Results of this study showed that the mechanical properties of propellant rely heavily on its mesoscopic structure. The grain filling volume fraction mainly influences the propellant initial modulus, the higher the volume fraction, the higher initial modulus. Additionally, it was found that the ratio of particles influences the tensile strength and breaking elongation rate of the propellant. The big particles could also improve the initial modulus of a propellant, but decrease its tensile strength and breaking elongation rate. Furthermore, the initial defects lowered the uniaxial tensile modulus, tensile strength, and the relaxation modulus of propellant, but did not affect the relaxation behavior of the propellant.

Effect of Bentonite and Zinc Borate (ZB) Addition on Recycled Polypropylene Composites against Tensile and Burning Rate Properties

2015 ◽  
Vol 1105 ◽  
pp. 56-61 ◽  
Author(s):  
Neng Sri Suharty ◽  
Hanafi Ismail ◽  
Fajar Rakhman Wibowo ◽  
Desi Suci Handayani ◽  
Maulidan Firdaus ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Burning Rate ◽  
Fire Retardant ◽  
Zinc Borate ◽  
Test Results ◽  
Natural Fire ◽  
Polypropylene Composites ◽  
Recycled Polypropylene ◽  
Fuel Resistance

Has successfully created an optimum composite of rPP/DVB/PP-AA/comBen+ZB based on the mechanical and fuel resistance properties. The starting material recycled PP (rPP), PP modified acrylic acid (AA) as coupling agent (PP-AA), crosslinker divinylbenzene (DVB), 20 phr of commercial bentonite (comBen) and 5 phr of zinc borate (ZB), was reactivelly processed in xylene. Composites analysis using XRD presented that the bentonite had been exfoliated inside of PP matrix. Test results showed that both of tensile strength (TS) and young's modulus (YM) of rPP/DVB/PP-AA/comBen+ZB composites following ASTM D638 was increased. The testing results of burning rate (BR) of composite rPP/DVB/PP-AA/comBen+ZB according to ASTM D635 decreased. The presence of bentonite as a natural fire retardant and ZB as fire retardant additive on composite rPP/DVB/PP-AA/comBen+ZB able to increase mechanical properties and also improving the flammability resistance.

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