Search results

A total of 14 cylinders and 14 prisms were tested to investigate their dynamic material properties by the forced resonance test.
The resonance test was used to evaluate mechanical properties of VMC, such as the small-strain Young's modulus of elasticity, the small-strain modulus of rigidity, the small-strain poisson's ratio, and damping ratio.
Dynamic material properties for cylindrical and prismatic concrete specimens have been evaluated in accordance with KS F2437 [6] which is similar to ASTM C215 [7].
Dynamic material properties of vibration-mitigated concretes have been investigated together with those for normal-and high-strength concretes.
Concrete material properties are more or less affected by water content, air temperature, humidity, and others.

Through tests and application, analyzes influential factors & reinforcement effect and application prospects & economic benefits of cement-soil mixing composite foundation, propounds some points of view for stabilizing & reinforcement soft-soil foundation by cement-soil mixing method especially in Yinchan District combined with constructive situations.
The Method and Principle of Cement-soil Mixing Method The Cement-soil mixing pile reinforcing foundation is a foundation treatment method..Using cement as a curing agent, adding a proportion of the additive agent forcing soil body through a special mechanical stirring.The solidifying agent and natural soil formed composite foundation together to support superstructure.
For this special case, base on the original method and equipment we increase equipment dynamic torque, add a special tool, improve process, making the cement-soil mixing method be able to promotion and application in Yinchuan District. 3.1 The mechanical equipment and construction technology The main part of deep mixing rig is composed of the rotary drilling rig power head, short conveyor slurry pipe and spiral spray of bit.
Based on the data doing the mechanical design and manufacture.
Soil sample collection is very important for cement mixing ratio and pile quality, shall be as detailed as possible understanding foundation soil structure and physical properties, determine the different mixing ratio. 2) Mixing materials and should be spray material prepared with different container holding, and with stirring device, it can control the water cement ratio, prevent segregation, keep the maintain the continuity of construction, control spray amount. 3) Cement-soil mixing piles must be embedded in good soil, and cannot form floating pile. 4) Before construction, according to the model and the mixing ratio to determine the injection quantity /minute, on this basis, taking four two spray mixing method through the test process, each cement spray slurry dosage control for the half of pile, and record spray machine gauge value, output and mixer speed. after taking sampling and observation pile the uniform degree of pile, determine the best spray pressure value

To evaluate the health of these mainstays were used wood samples from other similar structures in the same property, built at the same era of the slave quarters.
The results as such tests show the reduction of the mechanical resistance of the pieces evaluated, leading to the need to reassess the conditions of service of the structures considered.
For this research were performed readings about: the theory of restoration, the history of rural architecture of São Paulo region and technology and properties of building materials, especially wood.
Thus it was possible to conclude that the time was not as bad in the loss of resistance of the woods when it presents no aggravating factor for its sanity, as xylophages attack or moisture.
Pillar P2A: The section marked in green represents a crush resistance due to the presence of a slot, but this does not affect considerably crack resistance of the pillar.

Hussein3, c 1King Abdulaziz University, Mechanical Engineering Department, Rabigh 21911, Saudi Arabia 2FARCAMT, Advanced Manufacturing Institute, King Saud University, Riyadh 11421, Saudi Arabia 3Advanced Manufacturing Institute, King Saud University, Riyadh 11421, Saudi Arabia afabukhadra@kau.edu.sa, bjqudeiri@ksu.edu.sa, chhussein@ksu.edu.sa Keywords: Metamodels; Springback; Neural Network; D-Optimal Designs.
The amount of springback is affected by the interaction between many parameters, such as the material properties and geometric dimensions.
Due to the mechanical relaxation, the sheet bending angle is changed after removing the applied load.
The X matrix refers to the design matrix, each row in the matrix represents one experiment and each column represents one factor.
The regression equation matrix can be written as show in Eq. 3 (3) where b is a vector includes of regression equation coefficients relating a response vector y to the factors and interactions compose the X matrix.

One of the advantages of polymer nanocomposites over conventional composites is that nanocomposites can exhibit mechanical and thermal properties similar or superior to conventional composites even using a low amount of clay.
The formation of the carbonaceous residue affects the combustion of the PE systems with flameproof properties.
Karger-Kocsis, Morphology and mechanical properties of layered silicate reinforced natural and polyurethane rubber blends produced by latex compounding.
Nunes, Mechanical and flammability properties of EPDM (ethylene-propylene terpolymer) rubber compositions filled with carbon black and aluminum hydroxide.
Souza, Thermal and mechanical properties of PE/organoclay nanocomposites.

For the tools with coating materials of TiAlN, Al2O3, TiN, TiC, we can calculate the wear rate according to the Usui mathematical model of tool wear, and then consider thickness factor of TiC coating.
And the coating thickness affects the performance of heat insulation and bonding strength between coating and matrix directly.
The associated physical properties of the coating materials are listed in Table 1.
Physical properties of the coating materials Material Density [g/cm³] Melting Point [°C] Hardness [GPa] Elastic Modulus [GPa] Thermal Conductivity [W/m·K] Thermal Expansion [10-6/°C-1] TiAlN 4.5 2980 32.5 420 0.2604 4.8 Al2O3 3.9 2050 23 530 0.3024 8 TiN 5.2 2950 21 260 0.294 9.3 TiC 4.9 3150 32 500 0.1961 7.7 In AdvantEdge models, we set the tool’s rake angle of 5°, clearance angle of 10°, corner radius of 0.02 mm, and the corresponding cutting parameters are listed in Table 2.
Effect of TiC coatIng Thickness TiC coating exhibits high hardness and resistance to mechanical and abrasive wears.

The graphite is usually used as lubricant to adjust the friction and wear properties of.
Synthetic rubber to increase the actual contact area played an important role, but its content can affect brake heat resistance, need to carefully study the optimum blending ratio; Fiber 's role is to ensure that the strength of synthetic brake shoe.
Here the use of fiber polyamide and ceramic fibers, and to compensate for the material properties of the mixed form, can significantly improve the mechanical strength of brake shoe, increase material porosity factor, and can make the brake shoe having a vibration damping characteristics and reduce the braking noise [2]. 1.2 Technical analysis of synthetic brake shoe Page Numbers.
Project group to use all kinds of friction materials properties and Tribological Mechanism, the basic material composition and physicochemical indexes, as well as strength, impact toughness, elastic constant and the average friction coefficient under stable conditions, by improving the process method to realize the train at different speed stages friction coefficient micro adjustment to accommodate foreign overall braking system performance requirements, the is the key and difficult technology breakthrough.
Conclusions Brake shoe dry process is international and the railway system to increase the subway synthetic brake shoe hardness, improve brake shoe friction properties of the basic train of thought.

Through the establishment of the shaft lining automatic monitoring system, the mechanical state of shaft can be effectively analyzed and the overall safety can be valuated.
At the same time, the settlement layers affect the additional force on the shaft lining outside surface, which is the main factor causing the fracture of the shaft lining [1-3].
On the other hand, human factors influence is bigger.
Fig. 1 Software system diagram The application of automatic remote shaft lining monitoring system The vertical additional stress is uneven distribution along the depth of the shaft liner of, and it has closely related to the position of the aquifer, thickness, soil properties and precipitation rate, so accurately measure the size of the additional force and the variation law is very difficult.

The general trend of the DH appeared to be affected by the average r-value, or equivalently by the texture, of the materials.
Introduction Anisotropic yield functions are one of the most dominant factors that enhance the predictive accuracy of material deformation behavior and defects in sheet metal forming simulations [1, 2].
Mechanical properties of the test materials Material Tensile direction [°] [MPa] c* [MPa] n* a* r-value** Material A ‎[8] 0 (RD) 164 574 0.273 0.008 2.27 45 173 574 0.272 0.008 1.77 2.1 90 (TD) 170 564 0.273 0.009 2.65 Material B 0 (RD) 155 624 0.332 0.014 1.92 45 164 636 0.334 0.015 1.63 1.8 90 (TD) 161 616 0.349 0.018 2.13 Material C ‎[13] 0 (RD) 158 541 0.249 0.004 1.34 45 162 550 0.262 0.005 1.13 1.3 90 (TD) 159 535 0.260 0.005 1.50 *Approximated using for 0.0020.093, ** Measured at nominal strain0.1.
Tvergaard, V., Effect of strain path change on limits to ductility of anisotropic metal sheets, International Journal of Mechanical Sciences 42 (2000) 867–887
Kuczyński, Limit strains in the processes of stretch-forming sheet metal, International Journal of Mechanical Sciences 9 (1967) 609–620

Which can describe only those properties of the system that are of interest to us in terms of its study [16].
DoE L9 3X3 with Parameters of control as Factors.
DoE L9 3X3 with Parameters of control as factors.
Interactions effects between factors.
There is a main effect when different levels of a factor affect the response differently.