Five sets of boron steel sheet blanks are heat treated and their microstructures close to mixture ferritic pearlitic, upper bainitic, lower bainitic fully martensitic, respectively. It shows that the micro-hardness blank quenched in water-cooled die is 527 HV0.1, while intermediate hardness 401 322 HV0.1 280 maintained heated as well 181 cooled open furnace. Various constitutive models such Ghosh, extend Swift, modified Voce, et al., calibrated compared using stress-strain data five material...

In order to study the influence of texture on wear and lubrication performance surface tools, three kinds textures with unidirectional convergence morphology were processed samples, each was designed different area occupancy ratios. Simulation analysis shows that, owing reflow convection effect liquid in texture, lubricating film flowing through textured has a high hydrodynamic pressure value, semicircular ring is most prominent. By comparing friction coefficient, when ratio 10%, samples...

We present a novel online 3D scanning system for high-quality object reconstruction with mobile device, called Mobile3DScanner. Using device equipped an embedded RGBD camera, our provides capability users to acquire textured models. Starting simultaneous pose tracking and TSDF fusion module, allows scan get model real-time preview. After the process is completed, scanned globally optimized mapped multi-view textures as efficient postprocess final on device. Unlike most existing...

To improve the energy harvesting efficiency of piezoelectric device, a stack units-based structure was developed and verified. Factors such as stress distribution, load resistance, loads, loading times influencing properties were investigated using theoretical analysis experimental tests. The results show that unit number has negative relationship with generated distribution no influence on power generation array. However, small difference, units in parallel connection can obtain high...

H13 die steel often fails as a result of physical and chemical effects such wear, erosion cyclic stress. Accordingly, the study evaluates Co-based gradient coating on an featuring stress-relieving effect. Scanning electron microscope X-ray diffraction were used to analyze microstructure phase coatings. A microhardness tester friction wear compare hardness resistance coatings substrate, morphology was observed. pendulum impact test fracture Finally, corrosion substrate. The results show that...

Measurement and processing methodologies are developed to capture the in-situ inverse synthetic aperture radar (ISAR) image of an operating wind turbine. In-situ measurement data a small three-blade turbine collected using ultrawideband radar, measured signatures compared with simulation results based on physical optics. The backscattering phenomenology is examined in sinogram, spectrogram, ISAR domains. It shown that resulting images provide revealing geometrical insight into blade...

To advance the development of piezoelectric energy harvesters, this study designed and manufactured bridge-unit-based pile-unit-based devices. An indoor material testing system accelerated pavement test equipment were used to electrical performance, mechanical electromechanical coupling performance The results showed that elastic modulus pile structure device was relatively higher than bridge device. However, two devices should be improved avoid attenuation in service fatigue life caused by...

In this article, thermodynamic performance, economic analysis, and calcite scaling assessment have been completed for each of the investigated geothermal electricity systems Tibetan fields. The seven production include organic Rankine cycle (ORC), dual-stage ORC (DSORC), triple-stage (TSORC), single-flash (SF), double-stage flash (DSF), (SFORC), double-stage-flash (DSFORC). A selection map suitable has generated. DSORC TSORC can generate 20% more net power output than SF system under low...

On the 2nd runway of Shanghai Pudong International Airport, field assessment was conducted for rigid pavement stabilization using cementitious grout. The support performance underlying layers and voids beneath slabs were considered, deflection testing performed before after grouting. pre-treatment post-treatment pavements, effects injecting depth curing time on grouting treatment statistically analyzed. Results indicated that along wheelpath gradually getting deteriorated non-uniform during...

Explosive Consolidation Method has unique advantages with well prospects in the preparation and processing of bulk materials. In this paper, self-designed structure was employed to study influence mass ratio nano aluminum powder on mechanical properties nano-bulk material prepared by explosive consolidation. And microstructure aluminums under various conditions were compared evaluated based FMCE method. The results show that for single nano-powder through explosion consolidation, hardly any...

Abstract. Electro-hydrostatic actuator (EHA) is an important form of power-by-wire (PBW) technology, which widely used in aircraft because the characteristics small size, high power and light weight. However, current traditional EHA with fixed pump displacement variable motor speed (FPVM-EHA) has problems energy consumption heating under heavy load. An improved high-pressure load sensing (HPLS-EHA) proposed this paper, can reduce load, so as to achieve reducing torque motor, solving problem...

Display full sizeAbstractAn amphiphilic paradodecatungstate catalyst, [(C18H37)2N(CH3)2]9[NaH2W12O42] was prepared and characterized by Fourier transform infrared spectroscopy, UV–visible spectrum, differential thermal analysis, thermogravimetric analysis. The catalyst exhibits very high catalytic activity that dibenzothiophene (DBT) in model diesel can be oxidized into sulfones using hydrogen peroxide as an oxidant. reactivity of sulfur compounds decreased the order DBT > 4,6-DMDBT BT...

This paper proposed a precast concrete pavement structure with the composite base layer comprised of beam and filling low strength materials (B-PCP). The mechanical responses B-PCP induced by moving wheel loads coupled temperature were analysed using finite element method. Then optimal geometry was determined based on sensitivity analysis, considering tensile stress both slab layer, curling, faulting. Furthermore, performance evaluation conducted numerical analysis scale experiment testing,...