Materials Literature
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This paper studied the effects of powder size on densification, microstructure, and mechanical properties of the hot isostatic-pressed 2A12 aluminum alloy powder compact. The results show that the near-fully dense powder compact can be successfully achieved and the smaller the powder is, the higher the relative densit…
The aim of this paper was to examine the feasibility of using nanoparticles of SiO2 (nanosilica) to improve the performance of recycled aggregate concrete (RAC) containing recycled aggregate (RA) derived from processing construction and demolition waste of concrete buildings. The examined properties include compressiv…
In order to study the scraper conveyor load distribution in the process of cutting,a mathematical model between plow performance parameters and scraper conveyor transport performance parameters was established. Using numerical simulation obtained scraper conveyor loading capacity curve in condition of different planin…
A kind of pyroshock reduction device of honeycomb sandwich plate is designed,which takes the impact as the research object when satellite deploys the solar array. The dynamic model of shock response and the key points in design are explained in detail from the view of vibration reduction. Spring element was introduced…
In view of the problems such as low efficiency and surface cracks in optical glass processing,the experiment studied the influence of cutting parameters and acoustic parameters on milling forces and established a milling force model of optical glass ultrasonic vibration that based on the high frequency impact effect o…
In order to reduce the cost of fatigue crack growth test and shorten the research period of welding process on new aircraft siding structure,this paper uses Abaqus finite element software to simulate welding residual stress field by using predefined temperature field method.The stress intensity factor values of crack…
The manufacturing processing of blade,which has complicated structure and irregular surface shape,become increasingly high-speed.Thus,high acceleration is required to ensure the rapid movement of each axis.At the same time,the machining accuracy should be confirmed under the acceleration impact.The finite element mode…
To satisfied the requirement of the laser angle adjustment,this paper proposed a micro 3-PSP parallel robot with a special structure with the diameter of the static platform is 50 mm,the height of the system is about 74 mm-80 mm;Using the‘closed-loop vector method’to set up the inverse kinematics model of the parallel…
In order to improve a machine moving beam’s comprehensive performances,which includes static and dynamic characteristics,it must have a reasonable beam ribs layout and structural properties. The crossbeam was simplified to get the mechanical vibration model,the maximum coupling deformation was solved by the theoretica…
Perdynamic（PD） is used for analyzing crack propagation in engineering material fracture,the bonds constitute to the constitutive relation of the peridynamic,and the broken bonds represent to material fracture,but it can’t be used for the fatigue analysis.Based on the Miner’s linear cumulative damage theory,the bond fa…
The dynamic mechanical properties of aluminum honeycomb sandwich panels were investigated under low velocity drop weight impact test.The failure behaviors,destruction process and typical force-displacement curves were analyzed.The impact velocities and panel thickness have influence on ultimate impact force and energy…
Random fiber distribution may lead to randomness of longitudinal compressive behavior of fiber reinforced plastics（FRP）.To mimic random fiber distribution over the cross-section,a new algorithm named Latin Hypercube Sampling based on Random Sequential Expansion（LHS-RSE） is proposed,which can simulate the random fiber…
With the problems of complicated calculation process and lower computational efficiency in topology optimization using the traditional level set method（LSM） of heat conduction structures,parametric level set method（PLSM） is introduced into topology optimization for heat conduction structures.The compactly supported ra…
Apply Arbitrary Lagrangian Eulerian（ ALE） and Archard wear theory to establish wheel wear analysis model of CRH5,by finite element static and steady state analysis,combined with repair operations to obtain the wheel wear law under typical conditions,including dynamic distribution regularity along the surface of the wh…
Low cycle fatigue test（0.1 Hz 0.3 Hz,10~3 10~5 cycles） and conventional high cycle fatigue test（150 Hz.10~4 10~7 cycles） and ultra-high cycle fatigue test（20 k Hz,10~5 10~9 cycles） were carried on Ni-Cr Alloy at room temperature.The results of the three forms fatigue test were compared,and the energy-life curve reduce…
According to shearer vibration problems in the practical work,using multi-body dynamics theory,considering shearer support characteristics of guide boots and pin-rail,the friction between flat boots and middle trough,the connection characteristics between the parts of shearer,vibration angle of shearer,6 degrees of fr…
Aiming at the problem that accuracy of orthogonal locality preserving projections（OLPP） for fault diagnosis is not high enough,a fault diagnosis method based on semi-supervised neighborhood adaptive orthogonal locality preserving projections（SSNA-OLPP） for dimension reduction is proposed.In this method,fault features…
The theory of macro-micro two scale model obtains the micro plastic strains by using the macro-micro connecting factor,which is an effective theory to investigate the damage accumulation of the high fatigue and its failure mechanism.Based on the macro-micro theory,the evolution rule of the micro stresses and strains w…
Scraper conveyor chain and chain gear transmission as the research object,analysis of the scraper conveyor load and no-load conditions chain dynamics,and numerical simulation of the scraper conveyor special point chain speed and tension are simulated. The results showed that: the most important parameter of the chain…