Search results

Fig.5 Variation curve of � under certain inputs of WA and WB Fig.6 Simulation results of lapping traces on ball surface 0 20 40 60 80 -5 0 5 10 15 ¦¤¦Ä (¦Ìm ) Spin angle( 0 ) 30 40 50 60 70 80 38 40 42 44 46 48 Viberation(dB) Load(g.force/ball) Fig.7 Relationship between � and modifying Fig.8 Relationship between vibration ball’s capacity of diameter difference ( � � ) and loads under given conditons WA/WB (rad/s) Time (s) � ( �) Journal Title and Volume Number (to be inserted by the publisher) 199 Effecting Factors The two keys to globularity are affected by lots of factors expect for the motion principle of lapping process.
Some factors are listed below: Precision of Tools.
The factors, expect those mentioned above, such as the chemical and mechanical properties of slurry and pad also affect the shaping process, should be chosen properly.
Wang: Ultraprecision Manufacturing Technology Handbook (Mechanical Industry Press, China 1999)
Shi: Mechanical Technologist Vol. 8 (1995), p. 15

At 10%, the f value ranges from 0.0005004 to 0.0011364, where the experimental friction factor tends to be lower than the theoretical friction factor.
Introduction Fluid flow is known to have several flow properties, both static and dynamic, making it very interesting subject to study.
The density concentration refers to the number of solid particles dissolved in the liquid phase Changes in density concentration can affect the properties of two-phase fluid flow.
The effect of liquid viscosity on changes in density concentration, liquid viscosity is one of the important factors that influences changes in density concentration in two-phase fluid flow.
This can be explained by the nature of density as a factor that influences fluid flow properties, especially in the context of liquid-solid multiphase flow.

The following factors may further accelerate the cooling in the central part of the billet as compared to an intermediate radial (thickness) position.
Three factors may be decisive in the experimentally observed dependence of the eutectic fraction on cooling rate.
On the other hand, mechanical properties of semi-solid alloys in the vicinity of the solidus and their dependence on temperature give an indication whether the material is able to withstand the thermal stress and can accommodate the thermal strain, or it will crack.
The alloy composition and the process parameters that affect the amount of nonequilibrium eutectics are very important.
A comprehensive model and a corresponding new hot tearing criterion should include nucleation and propagation of hot tears and connect these processes (i) to the microstructure evolution during solidification of the semi-solid material; (ii) to the macroscopic and microscopic thermo-mechanical situation in the mushy zone; and (iii) to the mechanical (or fracture-mechanical) properties of the mushy zone.

The fully effective utilization of large aluminum forgings in aerospace structures has been hampered in the past by inadequate understanding of, and sometimes inaccurate representation of, bulk residual stresses and their impact on both design mechanical properties and structural performance.
Experimental Program A detailed, coupon level test program was conducted in order to quantify the impact that bulk residual stresses have on both mechanical properties (like strength, toughness and fatigue crack growth rate) and spectrum fatigue performance, including both crack initiation and crack growth.
With the additional assumption that the bulk material response is elastic, both stresses and stress intensity factors may be superimposed.
P., “Stress Intensity Factors, Crack Profiles, and Fatigue Crack Growth Rates in Residual Stress Fields,” Residual Stress Effects in Fatigue, ASTM STP 776, 1982
[11] Fett, T. and Munz, D., Stress Intensity Factors and Weight Functions, Computational Mechanics Publs, 1997

Effect of sliding speed on wear property of Al2O3-SiO2(sf) / AZ91D composite Guanjun Liu1, a, Xin Ning1, a Wenqing Zhang1, a and Zetong Yu1, a 1 School of Mechanical and Electronical Engineering, Henan Institute of Science and Technology, Xinxiang, Henan, 453003, China alguanj@126.com Keywords: Al2O3-SiO2(sf) / AZ91D composite, Aluminum Silicate Fiber, Sliding Speed, Wear Rate Abstract.
Dry sliding wear properties of the composites were tested by means of MM200 wear tester (block-on-ring configuration) against a hardened alloy steel counterface with hardness of 53HRC under loads of 10N, 20N, 30N, 40N and 50N and sliding speed of 0.47m/s and 0.92 m/ s, and wear morphology of the specimens was observed by SEM (scanning electron microscope).
Magnesium alloy matrix composites have better wear resistance property than magnesium alloys[3-4], but currently, the reinforcement of the MMCs is mainly Al2O3 fiber, SiC partical, TiB2 partical and TiC partical, et al [5-7], which their higher prices limit applications of the MMCs on civilian products.
In order to inverstigate wear resistance property of Al2O3-SiO2(sf) / AZ91D, effect of sliding speed on AZ91D alloy and the MMCs with volume fraction of 15%, 20%, 25% and 30% were investigated, and wear mechanism of the alloy and the MMCs.
As what mentioned before, wear rate of AZ91D matrix alloy will reduce when accumulation of friction heat leads to friction temperature increasing to 225 Celsius degree or more, but it is one of influencing factors on the wear mechanism of the MMC, which is the result of combined action of above two factors.

These will adversely affect the service properties of the joints, and are the main reasons why dissimilar-metal joining is normally far more complex than similar-metal joining in many respects.
Room-temperature mechanical properties and 3.
Room-temperature mechanical properties of the base metals (TiA and SS) were presented in Table 2.
Tensile Properties Assessment Fig. 6.
Mechanical properties increased continuously till 850 °C and then dropped together drastically at 875 °C.

The dyeing ability, mechanical and thermal properties, and crystalline structure of the PP, PLA, and PP/PLA fibers were investigated.
The resulting materials were characterized by mechanical properties, differential scanning calorimetry (DSC), ultraviolet-visible spectrometer, and X-ray diffraction (XRD).
Fig. 1 shows the mechanical properties of the PP, PLA, and PP/PLA fiber.
However, PLA is more brittle and has lower elongation properties.
The mechanical properties showed that the tenacity of the PP100 and the PLA100 were 3.1 g/denier and 0.5 g/denier, respectively.

Biodiesel occupies a prominent position among alternatives to conventional petrodiesel fuels owing to various technical and economic factors [2].
Rheological Properties of the FAME, Petrodiesel and their Blends: Rheological properties of the fatty acid methyl esters (FAME), petrodiesel, and their blends were determined.
Mounts, Variables affecting the yield vegetable oils of fatty esters from transesterified vegetable oils.
Ejikeme, Fuel Properties of the Derivatives of Soybean Oil.
Mounts, Variables affecting the yields of fatty esters from transesterified vegetable oils, J.

Several studies on the influence of the most relevant micro-EDM factors such as material removal rate, tool wear ratio and heat affected zones have been reported.
The factors influencing the machining performance also depend on the discharge energy applied for machining.The various issues such as surface roughness, heat affected zone, micro-hardness and crack formations and machining quality of the workpiece is determined by the sum of energy released in every spark [8].
EN-24 die steel is a high quality alloy steel and it is renowned for its high strength and wear resistant properties.
The properties of different electrode materials used for machining process are listed in Table 2.
It has been identified that MRR strongly depends on the properties of the materials and the higher thermal conductivity electrodes show better MRR.

Semi-solid processed components are heat-treatable and weldable and show superior mechanical properties.
An important element affecting the rheology in SSM processing is related to the particular microstructure of the alloy used and to its thixotropic behaviour.
Wang; Microstructure and mechanical properties of rheo-diecast AZ91D magnesium alloy; J.
Pan; Effects of rheocasting and heat treatment on microstructure and mechanical properties of A356 alloy; Scripta Materialia 53 (2005) pp.201–6
Zheng; Microstructure and mechanical properties of A356 aluminum alloy wheels prepared by thixo-forging combined with a low superheat casting process; Trans.