Search results

The transient friction stress was estimated by using equations given in the literature and some mathematical factors concerning the estimated dislocation densities and the net rates of dislocation immobilization at the high and low strain rates.
It is now well established that a change in strain rate results in a temporary imbalance in the internal state variables and hence, transients are observed in the flow stress, which cannot be defined by a mechanical equation of state [3,4].
Assuming that β does not change significantly during deformation so that the factor [β/(MD0b2)].exp(Qdef/RT) can be considered to be a constant, equal to K (Eq. 6).
Solute drag as a factor affecting Qrex was discussed in more detail in another paper [16].
Cser: Mathematical and Physical Simulation of the Properties of Hot rolled Products (Elsevier Science, Amsterdam 1999), p. 156 [11] L.P.

Confirmatory Factor Analysis (CFA) is used to test the reliability of a measurement model.
CFA allows the researcher to specify the actual relationship between the items and factors as well as linkages between them.
Some variables affect to informational purpose [1] analyzed in this study.
Two variables affected to dependent variables identified as informational content on packaging and ease of information delivery.
The Complete Guide to Properties and Performance, McGraw-Hill, New York, 2006

However, because of carbon fiber composite materials its unique physical structure and chemical properties, some phenomena liking delamination, fuzzing, thermal degradation, spalling and fiber pull-out are happened in the cutting process [3,4].
Therefore, it is necessary to study cutting parameters which affect surface roughness of CFRP, summarizing the influence law of each factor and then determining the mechanical processing scheme.
Fig. 1 Experimental set-up for milling The regression analysis for four factors at three levels was used for the elaboration of the plan of experiments.
Table 1 indicates the factors studied and the assignment of the corresponding levels.
Table 1 Assignment of the levels to the factors Level factors Level -1 0 1 [m/min] 157.0796 201.0619 245.0442 [mm] 0.2 0.6 1 [mm] 1 3 5 [mm/min] 100 200 300 Results and Discussion The surface roughness (Ra) was evaluated with the surface roughness measuring instrument, according to ISO 4287/1.

The micro-cracking and the interaction of micro-crackings will affect the mechanical properties of ceramics.
In this study, a new analysis method that links macro properties with micro-cracking for heterogeneous ceramics has been developed.
An attempt to simulate the relationship between micro cracking and macro mechanical behavior was made by relating the analysis result of four-point bending macro model and analysis results of crack propagation in micro model.
The crack initiates when the crack intensity factor, K, reaches a 'certain' critical value Kc achieved by increasing the external load [4].
In this standpoint of view, the system can be considered as a heterogeneous structure, and the stress intensity factor, K, can not be calculated directly in the FEM model.

(1) where N = axial force; M = bending moment; A = gross sectional area; W1 = section modulus of the edge in bigger compression; NE = Euler critical force; f0.2 = yield limit; η1 = 0.75 for weak hardening alloys, or η1 = 0.9 for strong hardening alloys; γ = plasticity adaptation factor, which is shown in Table 1; φ = stability factor, which is calculate from Eq. 2.
Analytical Method Aluminium alloys possess mechanical properties considerably different from each other, and their constitutive relationship cannot be simplified to perfectly elastic-plastic behaviour which is commonly used for steel.
Zhang [1] found that the in-plane stability capacity of extruded T-section aluminum beam-columns with the edge of the flange in bigger compression are affected by the classes of aluminum alloys largely.
And the analytical results show that the class of aluminium alloys and the kinds of cross-sections do affect the stability capacity obviously.
And the section modulus amplification factor, defined as 1.3, do not consider the class of aluminium alloys as η1 has already do that.

Consequently, these problems will seriously affect the lifetime and durability of the coating.
Therefore, How to improve the interfacial properties of camouflage coating and keep it functional has become a prior question in the research of military camouflage coatings.
Xia Juan[11] has systematically studied the contamination principal and influencing factors of paintings by using the widely used acrylic based emulsion coating.
After all, it is obvious that the interfacial properties of a coating have important influence on its whole performance.
Obviously, nano- TiO2 turns out to be somehow effective in improving the interfacial properties of the coating within the range of concentration tested in this experiment.

Cold heading technology is used in the small and medium-sized steel balls forming, and can ensure product accuracy and mechanical properties.
For the cold heading process defects problem，the common approach using artificial detection increased the subsequent workload and affect the entire production process of the steel ball.
(3) In this paper, influencing factors on the sensor is analyzed by ANSYS analysis.
It concludes the PVDF external radius, upper and lower cover surrounded by regional height change on PVDF films stress value have obvious influence, and to establish a mapping relationship between the influence factors and stress.
Mechanical Systems and Signal Processing 36 (2013) 317–331.

Vol. 38 (2000), p. 1707 ] investigated the CO2/N2 gas separation properties of a large series of poly (ethylene oxide) segmented copolymer with polyurethanes, polyamides and polyimides.
Carbon membranes combine improved gas transport properties for light gases with thermal and chemical stability.
Furthermore, the addition of inorganic materials in a polymer matrix offers enhanced physical, thermal and mechanical properties, representing a way to stabilize the polymer membrane against change in permselectivity with temperature.
Vol. 322 (2008), p. 423 ] investigated the effect of silica nano particles on the gas separation properties of ethylene vinyl acetate.
Membrane wetting is one of the most important factors affecting efficient CO2 separation process and long-term operation stability [[] Y.X.

Numerical simulation of chilled cast iron camshaft in sand casting process Binfeng Hea, Zhuqing Zhaob Department of Mechanical & Electronic Engineering, Xi’an University of Arts and Science, Xi’an, 710065 China agreatman_he@yahoo.com.cn, bzhaozhuqing1225@126.com Keywords: chilled cast iron; filling and solidification; numerical simulation Abstract.
There are many kinds of casting defects such as insufficient pouring, cooling separation, crack, and shrinkage and soon on were formed in the mold filling and the solidification process, which affect the final casting performance.
The development of automobile industry and engine power brings up more advanced requirement for the properties of camshaft.
There are many factors to affect the casting quality, but the most important affection is come from casting technology.

This means that electric conductance might be affected by distribution of the residual stress.
Electric conductivity was influenced by various factors such as solute atom content, dislocation, grain boundary, precursor phase, residual stress et al.
Therefore, it was certain that the property of electric wire such as electric conductivity were affected by a various deformation conditions.
Electric resistance measurement Electric resistance, R, was acquired by repeating measurement on the based of 4-probe method at longitudinal section of wire which was carefully removed from surface to core by mechanical polishing at 25℃, as shown in fig. 1, b).
Kim: Metal and Materials Vol. 2 (1996), p. 169 Wires Measured property Core Middle Surface Residual stress, σ [MPa]. -13.6±1.6 0 -23.6±0.3 4.5Φ wire Electric resistance, R[Ω], at 25℃ 0.270[Ω] - 0.273[Ω] Residual stress, σ [MPa]. 0 0 -16±2.1 2.3Φ wire Electric resistance, R[Ω], at 25℃ 1.098[Ω] - 1.105