Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: December 2010
Authors: Lang Cao, Wei Weng
This paper also analyses the factors which will influence the out-of-plate moment of the shearwall and it can provide usefull reference to further research on out-of-plate problems of shearwalls.
According to plate tectonic features and mechanical properties, the hollow-shearwall can be regarded as an orthotropic plate [1].
between d and the deflection WJ and WG (y=0.5b) deflection WJ (y=0.5b) Fig.4-5 Relationship between s and Fig.4-6 Relationship between Nx and the the deflection WJ (y=0.5b) deflection WJ (y=0.5b) Fig.4-7 Relationship between q and Fig.4-7a Relationship between q and the the deflection WJ (y=0.5b) deflection MJx (y=0.5b) Fig.4-7b Relationship between q and Fig.4-8 Relationship between H and the deflection the deflection MJy (y=0.5b) difference caused by different support (x=0.8a) Fig.4-9 Moment Mx distribution curve Fig.4-10 Moment My distribution curve along Axis-y(x=0.8a) along Axis-y(x=0.8a) Fig.4-11 Relative difference S distribution curve along Axis-y Conclusions and recommendations 1.From the above example ,we can see the thickness of hollow-shearwall affects
But when the end bending moments increase, the deflection of shear wall increases obviously (Figure4-7), and out-of-plane bending moment is also affected greatly.
Assuming k=a/b, when b is varied, the internal force and deflection are affected greatly.
Online since: September 2014
Authors: Yong Jun Deng, Zhi Jing Zhang, Xin Jin, Zhi Yao Xu
Experimental Studies of a Precision Tool Setting Method for Micro tool Based On the Principle of Electric Breakdown in Micro Gap Zhiyao Xu, Zhijing Zhang a *, Xin Jin and Yongjun Deng School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China azhijingzhang@bit.edu.cn Keywords: Non-contact tool setting, Electrical breakdown, Micro tool, High Precision Abstract.
(2) DFN is the threshold electric field required for field emission and is a function of the cathode material and surface properties and can be written as (3) where φ is the work function of the cathode, β is the geometric enhancement factor.
The current-gap cures of 5 new φ0.5mm milling cutters in atmospheric air when the electric potential is 30V with gap ranging from 5μm down to 0 4.4 The impact of the tool wear Figure 8 illustrates the electric breakdown mainly appears in the tip of the milling cutter, and the tool wear also appears in the tip, so the tool wear will affect the tool setting.
There are mainly two factors affected the accuracy of gap, one is the positioning accuracy of the micro stage, another is the deformation caused by the contact force.
Online since: February 2012
Authors: Jiang Gui Han
The stress concentration due to the materials with different mechanical properties makes the most damage occurred in the component interface.
Therefore, the crack propagation characteristics of the rubber are main factors of its strength.
Rivlin and Thomas [1,2] pointed out that the fatigue crack growth rate and tearing energy relations are material properties, independent of the load and specimen shape.
In order to affect the radial load and post-processing, the selection of the grid,structure 1 / 2, along the radial axis direction of symmetry, as shown in Fig.1, namely, the x-axis.
Online since: January 2007
Authors: Abdolreza Simchi, Hamed Asgharzadeh
The reasons for the success of these composites are their desirable properties, which include low density, high specific stiffness, controlled coefficient of thermal expansion, superior dimensional stability and increased fatigue resistance [1].
Generally, workability depends on the local conditions of stress, strain, strain rate, and temperature in combination with material factors, such as the resistance of the material to ductile fracture.
Moreover, grain boundary sliding occurring at high temperatures and low strain rates can lead to the formation of wedge-shaped cracks at grain boundaries that are initiation sites for damage and affect the mechanical properties of the component. [5].
Online since: June 2014
Authors: Lucian Toma Ciocan, Florin Miculescu, Marian Miculescu, Daniela Meghea
Due to outstanding aesthetic properties vitreous ceramics are suitable for the manufacture of inlays, crowns and small bridges.
Among the advantages of these types of materials good mechanical strength, low susceptibility to fracture, wear resistance and excellent corrosion resistance and biocompatibility are found.
An important factor regarding zirconia use limitation is the hydrothermal stability, since even used as yttria stabilized zirconia may become unstable during steam sterilization.
The morphology investigation at the level of the fractures revealed the defects at the zirconia layer structure that affect the extremely low fatigue resistance of this material [12, 14].
Reumont, Effect of annealing upon the structure and adhesion properties of sputtered bio-glass/titanium coatings, Appl Surf Sci 2009; 255: 9132-9138
Online since: February 2017
Authors: Viktoriya Viktorovna Nelubova, Valeria V. Strokova, Artem Valerievich Sumin, Igor V. Jernovskiy
Increasing of the mechanical characteristics of the composites can be achieved through the use of different modifiers, including nanostructured ones.
The comparatively low content of suolunite can be explained by the factors, mentioned above.
The microstructural study together with the data of x-ray diffraction allow to claim, that the silicate nanostructured modifier in the composition of cement definitely affects the changes in the overall pattern (kinetics) of the phase formation, also having a certain impact on the recruitment strength of the modified cement stone.
Influence of softener on reotekhnological properties of the nanostructured modifier.
Effect of previously slacked lime on properties of autoclave composite binders.
Online since: February 2017
Authors: Ling Hui Meng, Li Jun Zhang, Zhong Bing Chen, Yi Shi Lv, Jian Lin Zhang, Wei Shi
Characteristics and forming causes of the cracks in welded joint of 15Cr1Mo1V steel serviced 70000h are investigated by mechanical and chemical testing and crack morphology observation.
The paper studies an engineering case in an attempt to explore the early failure modes of the 15Cr1Mo1V steel joints in service and its cause, analyzes the parameters and influence factors for cracks control, and put forward preventive measures against the early failure with the purpose of ensuring safe operation of the steel joints in service life.
The general rule of SRC found in CrMoV heat resistant steel is that, affected by the stress, cavities are likely to emerge at the original coarse austenite grain boundary in the CGHAZ.
Estimation of material properties and maintenance of pressure parts of thermal power plant boilers under long-term service of 300,000 hours.
Creep Damage in Heat Affected Zone of 2. 25Cr1Mo Steel Welded Joint after Using under Long Term High Temperature.
Online since: June 2009
Authors: Ian A. Ashcroft, Rachel C. Thomson, Colum M. Holtam, David P. Baxter
It is possible to represent material properties, defect geometry and loading conditions in a mathematical form, and generate what is known as a failure assessment diagram (FAD).
Tensile Properties.
The tensile properties used in this paper (Table 2) are based on tests carried out at TWI, using the same X65 parent material as that used to generate the FCGR data (see section "Fatigue Crack Growth Rate Laws").
Table 2 Room temperature material properties used in the assessment Hardness (parent) 196 HV UTS 576 MPa 0.2% Proof Stress 478 MPa Young's Modulus 207 GPa Poisson's Ratio 0.3 Static Stresses.
ECA Safety Factors.
Online since: June 2012
Authors: Wan Hua Zhao, Jun Zhang, Jian Lu Wang, Liang Liang Wu, Yan Shui, Yi Fei Jiang
It was reported [3-5] that cutting fluid can improve the lubrication properties at high temperature and pressure and, reduce tool bond, improve tool life and get good surface quality.
These alloy elements can improve the mechanical properties, but reduce the machinability.
According to Eqs. 4 and 5, It can be seen that the influence degree of each factor on cutting force as follows: ap>fz>v, for both conditions of dry cutting and wet cutting.
The importance affecting the surface roughness ranks as fz >v >ap for dry cutting.
Due to the cooling and lubrication of the cutting fluid, the build-up edge is difficult to shape, which is an important factor on surface roughness.
Online since: October 2010
Authors: Hui Ping Ren, De Gang Li, Zi Li Jin, Bo Yan
However, production experiences have shown that the drawing properties of cold sheets rolled with CSP bands are not as good as those of cold sheets rolled from conventional hot strips.
Therefore, in recent years a number of studies have been made on how to produce acceptable hot bands for drawable cold sheet rolling[1-2] .The formability of cold sheets is primarily dependent on their strength level, work hardening ability, morphology of the microstructure and plastic anisotropy..In most cases, these properties are dominated by the grain size and the crystallographic texture resulting from the final treatment in the batch or continuous annealing furnace[3-6].The ability to control these structures through the manufacturing process of the steel is evidently of great importance.
The present paper discusses first the most significant factors that are recognised as affecting the recrystallization microtexture evolution in cold sheet with CSP bands.
Fig1 The annealing technology of the cold rolled specimens The samples for EBSD were mechanically polished and then electropolished in a solution of 400 ml glacial carbinol and 100ml perchloric acid at -30and at 15 V DC for 45-60s, in order to remove the deformation layer introduced during previous mechanical polishing.
Showing 21071 to 21080 of 26166 items