Search results

Furthermore, geopolymer materials have excellent properties such as high strength, low thermal conductivity, fire resistance, acid and alkali resistance and low carbon emissions, and can be applied in engineering materials for construction.
However, building materials are often subjected to high impact and instantaneous energy loads that can affect the structure.
In this study, C4 was used as explosive charge which TNT equivalent mass factor of 1.037.
Moreover, the fiber-reinforced geopolymer concrete fractured into pieces rather than disintegrating into powder, suggesting that the addition of fibers enhances the geopolymer's mechanical properties. 2.
Tayeh: Influence of steel fibers and microsilica on the mechanical properties of ultra-high-performance geopolymer concrete (UHP-GPC).

It is important to realize that the shrinkage-induced flow is a physical phenomenon that is always present in the transition region of a solidifying billet, whereas the transport of solute-lean solid with its accumulation in a certain part of a casting is a conditional incident, the occurrence of which depends on a number of factors such as the structure evolution, temperature regime, and the direction of strong flows.
Convection affects the segregation pattern in dependence on the flow direction.
There is a direct correlation between the geometry of the billet sump (affected by the process parameters) and the degree of macrosegregation.
(ed) Proceedings of International conference on Aluminum Alloys - Their Physical and Mechanical properties, Charlottesville, Virginia; USA, 17-29
Gottstein (ed) Proceedings of 11 th international conference on Aluminium Alloys: Their Physical and Mechanical Properties, Aachen, Germany, Wiley-VCH, 292-297.

Near Infrared Spectroscopy (NIRS) technique was used to predict the physical-mechanical properties (HEIN et al., 2010).
Barros filho (2009) compared two process for bagasse obtaining and concluded that such factors do not significant influence the quality of panels.
However, such properties were affected by increase of candeia wood in the panels.
Opposite results were obtained for mechanical properties.
Estimation of physical and mechanical properties of agro-based particleboards by near infrared spectroscopy.

Many factors that have direct affect to the impact testing of cylindrical tube structures have been investigated.
The mechanical properties used are the following: Young’s modulus E=69GPa; Poisson’s ratio ν=0.34; Mass density ρ=2.72 × 10-6 Mkg/L; Yield stress σy=0.260GPa; Ultimate stress σu=0.290GPa; Plastic hardening factor=0.1; and the strain failure 0.3.
Paruka, High Speed Impact Performance of Metal Tube Structure, B.Eng Thesis, Faculty of Mechanical and Manufacturing Engineering, UTHM, December 2011.

Consequently, the crankshaft requires not only good comprehensive mechanical properties such as high strength, rigidity, wear-resisting and anti-fatigue, but also favorable microstructure.
Among them, flash thickness and the fillet size of rod journal and main journal are structurally the main factors which affect the forming effect.
Initial forging temperature was set at 1150℃, the friction factor is 0.3, and coefficient of thermal expansion of the die was set at 1.4%, without warm-up.
MECHANICAL ENGINEERING & AUTOMATION, 2008,6(151):198-200

The finite element analysis: transfer car frame 3D modeling into SolidWorks COSMOS Works environment, setting Material properties: Q235, Elastic modulus: E = 206, Poisson's ratio: µ = 0.3, Material density: ρ = 7850.The restriction condition and the exerted load are shown in figure 2, 3.
Fig. 14 Safety factor on Full load Fig. 15 Safety factor on Crash lead running by full load running Fig. 16 Safety factor on Eccentric Fig. 17 Safety factor on Crash lead load running by eccentric load running Safety Factor's Finite Element Analysis Results.
Observe safety factor cloud in the figure 14,15,16,17.
Safety factor meet enterprise standards of safety coefficient requirements.
In the strain cloud we observe the four typical working conditions show that straightness which have no affect on frame reach design requirements, In the safety factor cloud we observe four typical working conditions which certify intensity and stability of the car frame, The analyses result show that this scheme not only improve the safety of the car frame but also reduce the cost of the car frame's materials.

Both the chemical composition and the mechanical properties of the alloy under investigation are fully available in literature [12].
Mechanical properties of Ti–6Al–4V specimens produced by shaped metal deposition.
Additive manufacturing of Ti–6Al–4V components by shaped metal deposition: microstructure and mechanical properties.
The effect of post-weld heat-treatment on mechanical properties and residual-stresses mapping in welded structural steel.
The microstructure and mechanical properties of low carbon steel welded components after the application of PWHTs.

The flow equation of the valve port is: (17) Affected by the compression and external leakage factor, the input and output flow of the hydraulic cylinder is not equal.
The design of robust controller 3.1 Introduction to the robust controller Robustness of control system is designed as the capability to keep stability and optimality constantly with the uncertainty factors, such as interference and modelling errors.
The low-pass filter link is to guarantee the realization of the zero factor link.
A simulation of traditional PID controller has also been done to compare the property of the electro-hydraulic proportional control system with that of adding robust compensator.
It can affect the positioning precision of the position closed-loop servo system.

Because the Ti-6Al-4V alloy is heat treatable alloys, microstructure and mechanical properties can be improved by proper heat treatment, in the application of titanium alloy, Ti-6Al-4V alloy is the most widely used, the yield is the largest, accounting for about 60% of the world's total output of titanium alloy.
Microstructure and properties of Ti-6Al-4V alloy have been reported more[4-6], but reports on solid phase transformation involving Ti-6Al-4V alloy during cooling are poorly understood, due to solid phase transformation of Ti-6Al-4V alloy during cooling directly affects the final microstructure and properties.
By the test of the DSC curve can obtain Ti-6Al-4V alloy during cooling of β1→α+ β2 phase change transition temperature and time, with the doctor Deloy Ozawa equation[7]: logB= logAE[RF(x)]-1-2.315-04567E(R.T)-1 calculate β1→α+β2 shift to activate, type: E to shift to activate, B as the heating rate, F (x) as phase transition function, T is temperature, for gas constant R, A frequency factor, x as the phase volume fraction, when x is constant, logAE/RF(x)-1 as a constant.
Effect of low temperature thermo-mechanical treatment on microstructures and mechanical properties of TC4 alloy [J].
Heat-treated microstructure and mechanical properties of TC4 alloy [J].

Introduction: Additive manufacture, which fabricates net or near net-shaped components with comparable properties in successive layers based on a sliced CAD, could dramatically reduce the manufacturing cost and increase the material efficiency compared with the traditional processing technology [1].
However, the effects of preheating on the residual stress and distortion of the electron beam additive manufactured components needs further investigation since it involves more complex thermal, mechanical and metallurgical interaction than the welding process.
Denlinger et al. [7] built a model for electron beam AM process and determined the energy efficiency and emissivity for the wire-feed electron beam additive manufacture system.In an earlier study, a 3D transient fully coupled thermo-mechanical finite element model has been built and rigorously validated for the purpose of understanding the thermal-mechanical behavior during the deposition [8].
As for the conditions with various scan rate, interval cooling time, and scan path, the average temperatures of the substrate after the preheat are very close to each other and therefore the maximum residual stress is not strongly affected by these factors.
Different scan paths also slightly affected the maximum distortion.