Search results

Motor plays an important role in the dynamic property of the rotary-screw-driven dispensing system.
It is proved that the flow rate in rotary screw dispensing process can be affected by several factors such as the motor speed, applied pressure, flow behavior of the fluid being dispensed, and screw geometry.
The results of real world application of system identification algorithms are always affected by the process and measurement noise associated with the system to be identified and the measurement set-up.
But we got second order system by model selection, analyzing shows that the reason should be the complex property of the fluid which results in the change of the load on the motor.
B., and Ke, H., 2006, “Effects of Fluid Properties on Dispensing Processes for Electronics Packaging,” IEEE Transactions on Electronics Packaging Manufacturing, Vol. 29, No. 2

A summary of the mechanical properties of bone is shown in Table 2.
The mechanical properties (Table 4) of HA make it improper for load bear application.
HA is normally sintered to improve its mechanical properties.
Mechanical properties of Hydroxyapatite [6].
Hydroxyapatite synthesis Purity, morphology, stoichiometry, and microstructure of HA are critical factors affecting its cell toxicity, mechanical properties, osteoconductivity, biocompatibility and bioactivity.

Introduction Aggressive media influencing polymer coatings cause their physical as well as chemical destruction (leaching, hydrolysis, oxidation), which leads to the loss of protective and decorative properties of coatings [1. 2. 3].
One of the aggressive factors that negatively influence polymer coatings are sodium chloride aqueous solutions that come from the sea and marine breeze and are commonly used as road de-icing agents in winter conditions [4, 5, 6].
The degree of the porosity of polymer coatings determines their barrier properties in relation to the substrate [8, 9, 10].
Furthermore, discolorations that appear on the surface and gloss loss (resulting from an increase in roughness) contribute to the deterioration of the decorative properties of the coating [2, 25].
The thermal properties of the coating were studied with reference to thermogravimetry (TG) while the effect of ageing on the mechanical properties of the coating was evaluated carrying out dynamic mechanical analysis (DMA) as well as assessing Buchholtz hardness.

Despite many flaws, including the omission of magneto-mechanical material properties in data analysis algorithms [19], the MMM method is also used to diagnose the technical state of ferromagnetic and paramagnetic objects and to forecast the risk of accelerated material fatigue.
Newnham: Properties of materials.
Burrows: Correlation of the magnetic and mechanical properties of steel (Scientific Papers of the Bureau of Standards No 272 1916)
Sandford: Effect of stress on the magnetic properties of steel wire (Scientific Papers of the Bureau of Standards No. 272 1916)
Ibrahim: Electrical and Magnetic Properties of D6ac Steel.

Fatigue properties of a squeeze cast Al-Si-Mg alloy were examined under rotating bending and the effect of humidity on the crack initiation and propagation behavior was investigated in controlled humidity.
Moreover, aluminum die casting technology has been dramatically improved to produce high-quality castings, among which squeeze casting can achieve superb mechanical properties, derived from its capability to suppress porosity and refine microstructure [1, 2].
In the present study, fatigue properties for squeeze cast Al alloy, Al-Si-Mg alloy were examined under rotating bending and the effect of humidity on the crack initiation and propagation behavior was investigated in controlled humidity.
The mechanical properties of the alloy were 0.2% proof stress of 219.9MPa, tensile strength of 310.5MPa and reduction of area of 15.2%, respectively.
zigzag manner being affected by microstructures like a eutectic Si, segregated Si particles, grain!

Flašker University of Maribor, Faculty of Natural Sciences and Mathematics, 2000 Maribor, Slovenia University of Maribor, Faculty of Mechanical Engineering, 2000 Maribor, SLOVENIA boris.abersek@uni-mb.si, joze.flasker@uni-mb.si Keywords: Gears, mathematical models, experiemnt, numerical analyses Abstract.
In order to calculate the service life as precisely and reliably as possible we need good mathematical models for describing loading, geometry, properties of materials and fracture mechanics parameters.
The test with surface area replication was affected with examination of loading of stress levels 892 N/mm 2 and 696 N/mm 2 , which corresponded to a service life of 22.385 and 80.150 cycles.
By means of the least square method from equation: ( ) 21 z ∆K = z dN da (1) for each pair of data thus obtain with the some stress level we determined the corresponding value of coefficient of the material for short cracks: z1 = 120,571742 and z2 = 3,069 R=2.5 R=2.5 The value of the tooth stress intensity factor K is related to propagation of the plastic zone, deformation and orientation of grain in case of short cracks and stress intensity factors in case of long cracks.
When we want to approximate the tooth stress intensity factor for general use for crack initiation, propagation of micro and macro crack, the stress intensity factor for gear tooth becomes a more complex form [2, 5]: ( ) ( ) ln + 0.2= 2 th th K ) - Kπ a σ Y(a/S) π a σ Y(a/S) ae K π σ (2) where the shape factor [4] is: ( ) ( )a/S Y L S - a/S Y L c - Y(a/S) = tm ϕ ϕ ϕ sin 6 sin cos       (3) where Ym(a/S) is the bending part and Yt(a/S) is the known shape factor for the compact tension specimen. (4) Replicas on gears.

Surface roughness plays a role in many areas and is an important factor in the evaluation of machining accuracy.
ASTM D638 is prepared by applying a tensile force to a test piece and measuring its properties under stress.
ASTM D638 is used to measure many different tensile properties as well as 3D printing and design parameters, along with the 3D printer.
From the investigation, it was observed that the feed rate affected the fill process, thereby affecting tensile strength.
Fig. 3 Tensile of specimens A, B, C, D, E Fig. 4 Tensile strength of specimens F, G, H, I, J Conclusions This study investigated the effects of two SLS printing parameters on the tensile properties of 3D products: laser power and feed rate.

The chemical composition and mechanical properties at ambient temperature are shown in Table 1 and Table 2.
Colloidal silica polishing Table 3 shows the creep test conditions and interruption conditions for smooth and notched specimen Table 1 Chemical composition(mass %) C Si Mn P S Cr Mo Ni V Cu N 0.06 0.53 1.45 0.025 0.012 18.38 0.22 10.04 <0.01 0.12 0.029 Table 2 Mechanical properties at ambient temperature 0.2% proof stress(MPa) Tensile strength(MPa) Elongation(%) 253 594 61 Fig. 1 Specimen configurations, observation areas for notched specimen and cutting for observation Table 3 Test conditions and interruption conditions for smooth and notched creep specimen Specimen Test temperature(˚C) Stress (MPa) Time to rupture tr(h) Time fraction t/tr Smooth 650 130 754.6 0.1, 0.219, 0.5, 0.817, 1 Notched 650 130 11518.7 0.1, 0.2, 0.5, 0.8, 1 Results and Discussion EBSD observation.
Phase transformation does not seem to affect the void formation sites apparently.
Void formation does not affect the relationships.
Some of the data coincide with the elastic concentration factor Kt=3.5 which suggests that the significant creep deformation might be restricted due to notch constraint.

MWCNTs are known to possess properties that are quite different.
So they have been aroused widespread concern for their high aspect ratios, excellent electrical and mechanical properties.
Temperature is not only influence gas-liquid distribution, but also affects the gas-solid distribution.
Conclusions The new PEG/MWCNTs fibers was prepared base on excellent adsorption and high temperature resistant properties of multi-walled carbon nanotubes.The optimal conditions of the new PEG/MWCNTs fibers for SPME was chosen.
Meanwhile, the properties of PEG/MWCNTsSPME fiber were compared with PEG fiber.

Aluminum-based metal matrix composites (MMCs) have been suggested due to intense interest from automobile, marine, aerospace and other structural applications owing to their balanced mechanical, physical and chemical properties.
MMCs have very good corrosion resistance properties along with good specific strength.
For instance, few studies have reported an improvement in the tribological properties of the material under various cooling agents [2-5].
A comprehensive study was conducted by Vishwas et al. [11] on the surface integrity properties of AISI 410 martensitic stainless steel.
Taguchi's L9 orthogonal array with three factors and three levels are used for the present experimental study as shown in Table 2 and Table 3.