Search results

The titanium affinity by oxygen is one of main factors that limit the application of their alloys as structural materials at high temperatures.
Introduction The affinity of titanium for oxygen is one of the main factors that limit the application of titanium alloys as structural materials at high temperatures.
Its creep properties in air have been well documented.
This is known to severely limit the high temperature capability of alloys in terms of their mechanical properties.
Table 1 - Tensile properties of Ti-6Al-4V alloy.

The mechanical property of the steels used for steel structure works plays a pivotal role in ensuring the safety of steel structure, and is always inspected by the client and relevant quality supervision department when inspecting and identifying the existing steel structure works in order to determine steel grade.
Each grinded area of the specimen shall be tested for once. 2.3.3 Sample from specimens The samples for tensile test shall be selected from the specimens which have been made with hardness inspection according to Position of Test Sampling of Mechanical Property and Specimen Preparation of Steels and Steel Products GB/T 2975-1998.
Reference: [1]National standard Conversion of Hardness and Strength for Ferrous Metal GB/T 1172-1999, China Standards Press, July 1999; [2] Duan Xiangsheng, Di Xiaotan, et al, Experimental Study on the Conversion of Leeb Hardness and Tensile Strength of Steels, architectural science, June 2003; [3] Zhang Hengyan, Lian Enchang, et al, Discussion on the Factors Affecting Measurement Precision of Leeb Hardness Meter, experience and society, No. 2, 2010; [4] Yang Dejian, Factors Affecting Measurement Precision of Portable Leeb Hardness Meter, measurement and test technology, March 2014.

The mechanism of the pulsed current annealing affecting the GMI effect is explained qualitatively.
Introduction The giant magneto-impedance (GMI) effect has attracted considerable scientific and technological interest especially because of its applicability in magnetic sensing and as an additional tool to investigate soft magnetic materials properties [1, 2, 3].
The penetration depth depends on electrical and magnetic properties of the conductor, such as conductivity, and circular permeability at a given frequency.
Thus, the magnetic anisotropy is a key factor affecting magneto-impedance effect.
Fig. 1 Experiment set-up for GMI Fig. 2 Schematic view of the magnetization of the magnetic domain The theory of influence of pulsed current annealing on the GMI effect There are two main reasons for the pulsed current annealing affecting the GMI effect.

Theoretical Background The “in service” engineering material performances at “complex structural components level” can be substantially different from the “material level” ones found by characterization campaigns on strength and stiffness properties.
Moreover, the fracture propagation can be affected by the speed of loading or by the temperature.
The Aluminium properties are recalled in Table I.
Table I: Material properties.
International Journal of Mechanical Sciences, 2010; 52(5): 672-679

Cao, Modifying the properties of steel slag by iron tailings at high temperature (in Chinese), J.
The physic-mechanical properties such as linear shrinkage, water absorption and flexural strength were measured for the fired samples.
Sintering properties.
Water absorption is an important factor affecting the mechanical properties of ceramics.
With the temperature increasing, the quartz gradually decreased and finally the dominant crystalline phase diopside with columnar crystals in 2-5μm at length was obtained, which contributed to excellent mechanical properties.

Experiments Steel chemical composition and properties.
The chemical composition of the steel is shown in Table 1, while the mechanical properties of the steel at room temperature 20 °C are shown in Table 2.
Material properties.
The other temperature-dependent physical properties and mechanical characteristics are shown in Table 4.
Table 4 Thermo-mechanical material properties of the test steel Temp.

But with changes in temperature, humidity and amount of traffic, serious cracking problems also exist in this pavement, affecting pavement performance.
Introduction Now in our country, the Technical Specifications for Construction of Highway Roadbases set semi-rigid base mixture was only strength as an evaluation index, but using better mechanical properties of cement stabilized gravel mixture for paving base, the anti-crack performance may not be optimal, which is also why only use the strength to control road base will do nothing to reduce the shrinkage crack of base.
Therefore, in addition to studying mechanical properties of cement stabilized gravel base material,the shrinkage study is also necessary.
Such cracks will spread to the upper with the repeated vehicle load, and the asphalt pavement will crack and get damaged [1].The load type crack is mainly related to factors such as surface layer thickness, thickness of base, base materials,overload,and so on.

Introduction Rock salt is a kind of soft rock, and it has excellent physical and mechanical properties of the low permeability and good self-healing ability which make it to be widely recognized as the ideal energy underground storage sites.
To numerical analysis, the influencing factors in salt formation containing the cavity shape, size, depth, and mechanical parameters have been accomplished, so was the optimal design parameters of the cavity for safe operation of gas storage in salt rock [2-4].
Based on these specific circumstances, the domestic scholars studied on the physical and mechanical properties of the layered rock salt, and got a systematic study of mechanical properties and solubility characteristics of rock salt in different conditions [5-6]; and proposed several damage model of interlayer collapse [7-11]; the preliminary studies on the influence about mudstone interlayer to cavity stability also be carried out.
During the construction process of underground energy storage, the concentration distribution is the key factor affecting the shape of the cavity, which impacts the dissolution rate of the rock salt.
Experimental research on acoustic and dissolved properties of stress damaged salt rock[J].

The Effects of Shape and Tool Material on Aluminum Sheet Spinning Majid Elyasi1, a *, Mohsen Ghafari1,b and Mohammad Bakhshi-Jooybari1,c 1Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, P.O. 484, Babol, Mazandaran, Iran aelyasi@nit.ac.ir, be.ghafari.mohsen@gmail.com, cbakhshi@nit.ac.ir Keywords: Spinning, Material properties, Formability, Smoothness, Roughness.
Some researchers have done a few researches to investigate the effect of tool properties on the output parameters of spinning.
Experimental Work The main process parameters and sheet properties are shown in Table 1.
Mechanical properties of aluminum sheet and friction coefficients between four kinds of tool material and blank are presented in Table 2 and Table 3, respectively Fig. 7 The tools and blank modeled in the software.
Tabel 2 Material properties of AL1100.

Comparison Simulation of Friction Heat and Joule Heat in Electromagnetic Railgun Longwen Jin, Bin Lei, Zhiyuan Li and Qian Zhang Shijiazhuang Mechanical Engineering College, Shijiazhuang, Hebei, 050003, P.
However, the miniaturization of pulsed power supply and the material failure of rail surface which decrease emission efficiency, firing accuracy and lifetime of rails are the important factors which restrict the continued development of railguns.
While the transient temperature rise of the armature/rail contact interface is a key factor to cause the change of the interfacial material properties and material failure.
Friction is a typical energy-consuming process, and in this process mechanical energy transforms into heat energy, sliding friction is an important heat source in the electrical contact process.
The temperature rise affect only the area near the contact interface and the maximum temperature occurred at the bottom of the armature.