Search results

Effect of Aging and Microstructure on Mechanical Rolling CuAlNi Shape Memory Alloy G.S.
Introduction Shape memory effect is called as the property to recover the original shape from deformed one by heat treatment above critical temperature.
Therefore, in order to apply to mechanical and thermal materials, it is important to obtain the experimental data for a transformation under the loading, and physical properties, and slip resistant for repeated thermal cycling.
Another factor is the decrease of Al concentration by the change of β1 F+ γ1 F Phase, and the increase of orderness during a long time aging.
Also, they affected in the formation of G.P zone and transformation temperature in company with γ2 phase formed by θ F to θ at grain boundary.

Thus, the packing density of the adsorbent affects directly the excess adsorption on a volumetric basis.
The mold was installed in a mechanical press.
All of them have mechanical stability and can be well managed.
It has been well proved [15,26] that, depending on the adsorption temperature and on the pressure used, the hydrogen uptake depends on the sample properties (i.e., the micropore volume (also the apparent BET surface area) or the narrow-micropore volume).
Furthermore, if the density of the sample used is different from the packing density or the monolith density, the results will be affected.

The study began with testing the physical properties of aggregates and asphalt, both conventional and modified.
After testing the physical properties, the next step was determining the optimum asphalt content.
The R² value of 0.835 indicates that 83.52% of the variation is explained by the model, with the remaining 16.48% attributed to factors related to the modification of the asphalt used [24].
Kang, “Mechanical Properties of Porous Asphalt Mixtures Containing Styrene-Butadiene-Styrene and High-Viscosity Modifiers,” J.
Setyawan, “Design and properties of hot mixture porous asphalt for semi-flexible pavement applications,” J.

Poor applicability of traditional processing technology, difficult to process and high processing costs affect the overall growth of the using of Nomex honeycomb material [4].
With the Nomex honeycomb composite material properties, this paper proposed the NC cutting method based on ultrasonic vibration, analyzed the curved surface forming principle and established an error analysis model.
The basic principle of ultrasonic cutting is to use an electronic ultrasonic generator, which first creates an ultrasound with the frequency 20~30kHz, then the ultrasonic-mechanical converter placed inside the ultrasonic cutting head converts the ultrasonic vibration with weak amplitude and energy into mechanical vibration of same frequency, and the resonance amplifier gets amplitude and energy that is strong enough and can meet the requirements of cutting parts, finally transfers to the cutting tool placed on the top of the ultrasonic cutting head for the cutting process of composite material.
Tool path generation is by the parts geometry model, to calculate the tool position and produce processing trajectory, according to the selected cutting machine, cutting tool, feed method, mechanical allowance and other factors.
Hong Soon H:Mechanical behavior and failure process during compressive of honeycomb composite at elevated temperatures.

Introduction Joints are the main influencing factor for the deformation, failure and instability of surrounding rocks.
Currently, few attempts have been done on the stability of tunnels affected by joint sets with different orientations and overburden pressures.
Without original state of strain energy, this elastic body is considered as an optimal material to simulate the actual behaviours of physical and mechanical properties of a geological body after diagenesis.
Studies shown the main cause of the deformation and failure of the tunnels are the mechanical performance of the shear slip and deformation of joints due to excavation and the overburden pressure.
Its mechanical essences are the continued deformation and the repeated failure of joints in varied stress field caused by excavation and overburden pressures.

In a second stage, a representative sample of the affected area was analyzed and thoroughly evaluated.
This radiation, defined by the Stefan-Boltzmann law [17], is proportional to body temperature and the thermal properties of the material.
Ultrasonics is based on the acoustic properties of the material.
Sound wood: From the dynamic elasticity modulus (Ed) a correlation (eq. 3) with elastic properties determined by bending tests (MOE) is obtained.
“Timber in buildings: Estimation of some properties using Pilodyn® and Resistograph®” Proceedings of the XII DBMC, International Conference on Durability of Building Materials and Components, Porto, Portugal, April 2011

Theoretical Analyses of Vibration and Sound Radiation Responses of Heated Symmetric Laminated Plates in Pre- and Post-Buckling Ranges Wei Li, Qian Geng and Yue Ming Li a * State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China a liyueming@mail.xjtu.edu.cn Keywords: Laminated plate, Dynamic response, Thermal buckling.
Thickness of the facing layers is 2 mm, and material properties are Young’s modulus 210 GPa, Poisson’s ratio 0.27, mass density 7850 kg/m3, and thermal expansion coefficient 10-5 K-1.
All the material properties are considered to be temperature independent. 0 oC is defined as the reference temperature which represents the state without thermal influence.
Affected by the two effects, the increment of frequency suggests that the stiffening effect of thermal load plays the leading role.
Thermal environment performs as two opposite factors before and after buckling.

Keywords: PbTiO3, PbTi0.8O2.6, sol-hydrothermal, hydrothermal Introduction PbTiO3 is a very important perovskite ceramic possessing excellent piezoelectric, pyroelectric, ferroelectric and electro-optical properties, which makes it widely used in the fabrication of high frequency filters, pyroelectric infrared detectors, delay lines and oscillators [1,2,3].
Hydrothermal reactions were preformed using a 200ml stainless steel Telflon-lined autoclave with a magnetically driven stirrer as reaction temperature was above 100 oC, whereas common glass instruments and mechanical stirrer were needed as the reaction temperature is below 100 oC.
Fig.2 XRD patterns showing the influence of reaction temperature on PbTiO3 products synthesized by two methods (A) hydrothermal 100-160 oC 24h (B) sol-hydrothermal 60-160 o C 24h Temperature is one of the critical factors both in sol-hydrothermal and hydrothermal synthesis.
Compared with hydrothermal, sol treatment has affected the final products.
Vol 6 (1993), p. 1033 [12] Li Xiaobing: Preparation, Structure and Properties of Poezoelectric Ceramics and Piezoelectric Composites (Beijing University of Aeronautics and Astronautics Doctor Dissertation, China, 2002)

Citation & Copyright (to be inserted by the publisher) Measurement of Monodisperse Particle Charge in DC Plasma Kang-Ho Ahn 1, Jang-Sik Han 2 and Gon-Ho Kim 3 1, 2 Department of Mechanical Engineering 3 Department of Applied Physics Hanyang University, 1271 Sa 1-dong, Ansan, 425-791, Korea Keywords: Number of Charge, Charge measurement, Magnetized plasma, Al2O3 particles Abstract.
However, their research results were sometimes unrealistic or did not measure the particle size distributions and its concentrations, which are obviously very important factors on particle charging.
In this research, the known size and known concentration of particles are introduced into a plasma chamber and the plasma properties and the single particle charge are measured in the magnetized and unmagnetized DC plasma to understand the particle charging characteristics.
The plasma properties are measured with house made Langmuir probe which has 6.2mm diameter tantalum disk at the tip of the probe.
The measurement also shows that the magnetic field strongly affects on the particle charging.

Calculation Method of Curvature Radius and Bending Deformation of Titanium Alloy under Multiple Laser Shocks Ran Zhu1,a, Yongkang Zhang2,b, Guifang Sun1,c*, PuLi1,d, Boyong Su1, Xu Pei1, Yong Zhao3 and Jianyun Huang3 1School of Mechanical Engineering, Southeast University, Nanjing, Jiangsu 211189, P.R.
The presence of large compressive residual stress beneath the treated surface contributes to improve fatigue, corrosion and wear resistance properties of metallic components[2-4].LSP has wide applications in the manufacturing industry of engines, boats, cars and planes [5].
However, the treatment may also affect other aspects of the component, such as bending deformation of metal component processed by LSP.
The principle of LSP process A literature review[6-8] is carried out to predict deformation for LSP through experiment trials, which are expensive, time-consuming and unreliable due to the factors arising from setting up the LSP process.
Since the eigenstrain is mainly related to the process parameters, material properties, and the specimen thickness in the LSP process, the simulation results of the LSP induced eigenstrains presented in the present paper refer to a 18mm*18mm*3mm square shaped samples.