Developing self-lubricating composites with excellent tribological, thermal, and mechanical properties is a key aspect to solving the wear of materials. Herein, ionic liquid functionalized graphene (ILFG) were prepared by π-π stacking interface design strategy. Then, range ILFG was filled into polyimide (PI) matrix prepare ILFG/PI (IGPI), their tribological investigated plate-on-ring apparatus under dry sliding conditions. When content 0.4 wt%, friction coefficient specific rate IGPI...

Nanosized aluminum (16% by weight) was added into JP-10 and surfactant (2% used to reduce the agglomeration of nanoparticles. Combustion metalized fuel, as well pure JP-10, carried out in a small-scale combustor. The oxygen-to-fuel ratios were set be 1.7, 1.8, 1.9, respectively. An additional trial water injection during combustion also tested. pressures at chamber nozzle exit, along with thrust, measured combustion; intervals true values specific impulse presented. results showed that...

Nano-sized energetic particle as fuel additives is of great significance for liquid hydrocarbon fuels that will exhibit high-density and high-calorific value in high-speed propulsion systems. An experimental investigation has been conducted to determine the propulsive combustion behavior containing boron nanoparticles. In this study, nano-sized particles with average diameter 20 nm are added into basic JP-10 quadricyclane, respectively. They then referred slurry burned rocket combustor using...

To explore the effect of added graphene sheets (GNs) and perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) on tribological mechanical performances polyimide (PI) matrix, GNs PTCDA reinforced PI-based composites were synthesized via blending method. The properties GNs/PTCDA/PI (GAPI) with different weight ratios under dry sliding, deionized water lubrication, kerosene lubrication comparatively investigated. A synergism was found between PTCDA; this endowed filled PI a lower friction...

Effects of various grain sizes (10~390 µm) under heating rate 40 °C/min on ammonium perchlorate (AP) decomposition characteristic parameters, the thermal behavior and kinetic parameters (activation energy pre-exponential factor), were investigated by simultaneous DSC/TGA in a dynamic nitrogen atmosphere. In addition, specific surface areas measured BET-method. Moreover, determined simplified approach based isoconversional method. The results showed that, higher AP particle size lower...

Abstract Grade 92 steel has been widely applied in the power generation industry for use as steam pipes, headers, tubes, etc. owing to a good combination of creep and corrosion resistance. For welding thick section multi-pass submerged arc process is typically used achieve sufficient toughness weld. To relieve internal stress welds stabilise their microstructures, post weld heat treatment (PWHT) commonly applied. The conditions PWHT have significant effect on both resulting microstructure...

In the aerospace field, energetic nanoparticles (NPs) are added to fuels increase fuel density and energy. However, non-Newtonian feature of NPs containing suspension restricts their application. High pressure gas-assistance (HPGA) is an effective technique for improving oscillations a liquid jet, especially heavy oil. This study developed set spray systems investigate characteristics NP in HPGA Y-jet injector. To change resonance injectors, three different injectors with unique structural...

Abstract In the damage analysis of material with complex microstructures, a full‐scale direct numerical simulation (DNS) could produce huge computational costs. Alternatively, multiscale modeling is more effective method by using less degrees freedom to balance calculation accuracy and cost. this paper, new proposed based on framework variational model originally presented Jezdan et al. relaxation Junker A statement for free energy dissipation potential coarse scale constructed relating fine...

The soil-water characteristic curve (SWCC) reflects water storage capacity, Measuring it accurately is important in engineering. This paper concluded main factors of SWCC, measured loess under conditions different dry densities, the volume content, saturation and matric suction were presented, curves showed similar change trend, mainly determined when was small.

Purpose For the difference of change law material memory performance and influence damage state on performance, this paper aims to establish a general model fatigue accumulation based dynamic residual S–N curve characteristics. Design/methodology/approach This introduces characteristics, combined with method, uses exponential decay function load cycle construct function. While considering state, loading order can be fully considered. The parameter d in not only represents variation...