Search results

Corrosion development with service time The corrosion loss of reinforcing bars is an important influential factor on the strength of steel and bond properties between reinforcement and concrete.
Corrosion rate is affected by the concrete properties and the cover thickness [8,9].
The parameters affecting corrosion are described as random variables, and their mean values and coefficient of variation (COV) are shown in Table 1. 105 15 12 8.8 8.9 66 15 Fig. 3.
In summary, both the concrete strength and cover are the main influential factors on the reinforcing bar corrosion.
Incomplete information and tempral and spatial uncertainties of corrosion influential factors are considered.

Reinforcement in construction involves the strategic integration of specific materials with desired mechanical properties into other materials that may lack these attributes.
This translates to a notable improvement in mechanical properties when specific lengths and quantities of wheat straw fibers are judiciously integrated into the concrete mix.
Environmental factors such as freeze-thaw cycles, moisture infiltration, and temperature fluctuations further exacerbate distresses by undermining the pavement's structural integrity [17].
WSFRC overlays are meticulously engineered to maintain a slender profile without compromising load-bearing capacity, thanks to the material's impressive resistance to environmental factors and abrasion [22].
Sasmal, "Recent advances in evaluation of intrinsic mechanical properties of cementitious composites using nanoindentation technique," Construction and Building Materials, vol. 223, pp. 883-897, 2019

The deterioration of flexible bound bituminous road layers in the form of creep deformation (rutting) or fatigue cracking is caused by a number of contributing factors.
The properties of the bitumen used are shown in Table 1.
Table 1: Properties of Virgin Bitumen Properties of Virgin Bitumen Penetration (dmm) Softening Point (°C) Viscosity (Pa s) 84 53 0.44 Preparation of GO.
Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene.
Effect of graphene oxide nanosheets of microstructure and mechanical properties of cement composites.

The molecular design of conventional additives mainly focuses on the purpose of meeting the operational performance of lubricants and considers a little about factors like environmental protection and ecological conservation and less about the toxicity and biodegradability of lubricants.
For environment friendly lubricant additives, low toxicity, excellent biodegradability and great functions are the main factors considered.The adding of additives will generate a certain impact on the biodegradability of base oil.
Particularly, it will have a harmful effect on the active microorganisms or enzymes in the process of decomposition of base oil, thus affecting the biodegradation rate of base oil.
Effect of nano grade copper powder on wear and friction properties of lubricant[ J ].
Improving antiwear properties of lubrication oil with nano copper powder[ J ].

Modal properties and quantities derived from these properties, such as mode shape curvature and dynamic flexibility matrix indices, have been the primary features used to identify damage in bridge structures.
The response of MFC transducers to flexural (A0) mode of Lamb waves is decomposed into the longitudinal and transverse sensitivity factors which extract the incoming wave directions [8,9].
Properties of the Lamb waves generated are: Frequency, f = 20kHz: Wavelength, λ= 28.44mm:Group velocity, Cg = 1125.7m/sec Phase Velocity, Cp = 568.8m/sec: Wave number, k = 251 The plate with MFC patches has been modeled as a composite shell sections with three layers, one MFC layer, second aluminum plate layer and third a dummy layer with a highly reduced stiffness.
Because the stiffness and the density are highly reduced, it will not affect the final results of the analysis.
The sensitivity factors for MFC transducers, S1 and S2 calculated using Eq.1 and Eq.2, S1=Sθ=00=2t(d31E1+d32ν12E2)sin(kl2)lk1-ν12ν21e33σ-(d312E1+2d31d32ν12E2+d322E2)] (1) S2=Sθ=900=2t(d32E2+d31ν12E2)sin(kb2)bk1-ν12ν21e33σ-(d312E1+2d31d32ν12E2+d322E2)] (2) S1 = -1.22499×105 S2 = -7.45189×105 Then the transverse sensitivity factor calculated from Eq.3, KT=S2S1=l(d32E2+d31ν12E2)sin(kb2)b(d31E1+d32ν12E2)sin(kl2) (3) KT = 0. 609141 The element size considered should be less the λ/20 as per reference [11, 12].

The reaction to earthquake is affected not only by the relevant dynamic characteristics of tue structure itself but also by the input seismic wave spectral components and other factors.
So deep analysis on the characteristic of the spectrum response can provide a lot of instructive information to the study on the mechanical response from the earthquake, failure mechanism, optimal design and so on.
Based on the jumping phenomenon of the frequency distribution, the paper holds that the natural frequency of single-layer shell focuses on three areas and rise-span ratio is the main factor affecting the structural frequency change; Reference 3 analyzed the parameters about the free vibration characteristics and did the computational research on the dynamic response, which concludes that the latticed shell structure has good seismic behavior when the rise-span ratio is somewhere between 1/3-1/4.
This paper discusses how the changes affect the distribution of natural vibration frequency in roofing gravity load, rise-span ratio, thickness, initial defect structure and other factors as follows:(1).Along with roofing gravity load increasing, the overall frequency distribution drops (Figure 1) and reflects two features: the falling amplitude of the frequency declines; for a given load increment , the falling amplitude of high order frequency is greater than the low; moreover, the structure frequency of small gravity load is relatively discrete.(2).
Spatial Structures, 4(2005) ,p.36—39.China [4] TIAN Bei-ping; MAO Wen-jun.Analysis of dynamic properties for cable-stayed latticed shell structure.

Therefore, forklift hydraulic system quality will directly affect the forklift's performance.
In addition, a symptom may be a failure factor, and it also may be the combined effects of multiple failure factors; a failure factor may be a symptom, and it also may be multiple symptoms, so between the fault phenomenon and the fault causes form a complex network relationships.
Acquisition secondary rule knowledge Secondary rule for forklift hydraulic systems knowledge acquisition can be summarized as follows: (1) Understanding the forklift hydraulic system components and working principle, the rules in a knowledge-based decision making decision table constructed on the property; (2) Sample properties parameter selection.
These samples can be made ​​of diagnostic rules; these rules do not change the original diagnosis of the diagnosis result information table, and achieve fault tolerance, that is to say, if the important properties of some conditions attribute are low, it can not be considered, the diagnosis results will not affect.
Chinese Journal of Mechanical Engineering, 2006,17(16):1672-1674

The temperature at the junction of an electronic package (chip temperature) has become the limiting factor that determines the lifetime of the package.
A particular type of two dimensional separation flow that is associated with plane flow past a surface-mounted rib with constant properties had been conducted by Hsieh and Huang (1987).
Factors affecting the chip temperature such as coolant velocity, chip power and thermal conductivity of materials are studied and presented. 2.0 The Numerical Model 2.1 Governing Equations The basic equations describing the flow of fluid are conservation of mass, conservation of momentum and conservation of energy.
Outflow Inlet air velocity a) Isometric View 10 cm 9 cm 7 cm Thermal Pad Motherboard (PCB) b) Side view Figure 1: Simulation Setup for 4 PLCC Packages Table 1: Dimension of Components Used in Simulation Component Quantity Size (cm3) Wind tunnel 1 52.5 cm × 10 cm × 10 cm Motherboard 1 33.3 cm × 0.15 cm × 8 cm Thermal pad 4 2 cm × 0.1 cm × 2 cm Chip 4 2 cm × 0.3 cm × 2 cm A combined model is used for packages and the properties of the packages are uniform.
It is tolerable as slight difference in shape may not affect the simulation result. 3.0 Results and Discussion The results are presented in terms of junction temperature and thermal resistance for the packages under different operating conditions.

Thin-walled workpieces own the characters of low stiffness, poor manufacturability in the manufacturing process, and under the influence of factors such as material properties, initial residual stress, cutting force, clamping force they can produce deformation easily, which will affect the processing precision and efficiency seriously.
It is difficult to control the machining accuracy and achieve higher machining efficiency under the influence of these factors.
The connection between thin-walled element boundary and other portions of the workpiece has a restriction effect on the thin local deformation, which is one of the important factors influencing the deformation amount.
Level factors 1 2 3 4 Milling speed n（r/min） 8000 10000 12000 14000 Milling depth（mm） 10 14 16 20 Milling width（mm） 0.3 0.8 1.3 1.8 Feed amount（mm/teeth） 0.04 0.06 0.08 0.1 According to Table 1 processing parameters, study the effect from milling force owning different processing parameters on machining deformation. 
Reference [1] Wang Zhi-gang, He Ning, Zhang Bing et al.(1.Department of Mechanical Engineering of NUAA, Nanjiny 210016;2.Chengdu Industrial Enterprise of Aircrafts, Chengdu 610041) [2] Kline W.A.

The factor of stress shift is
(3) Therefore, the long-term creep properties under low stress of non-linear viscoelastic material can be achieved by short-term creep data under high stress.
The corresponding shift factors are shown in Fig. 4.
The shift factors of rice hull flour/PP composite on the creep compliance curves are calculated by non-linear fitting.
Therefore, the shift factors of stress of this Rice hull flour/PP composite can be get