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Online since: August 2011
Authors: Li Hou, Chuan Hui Liu, Qin Ying, Liang Zhong
Because of the great difference from micro mechanical to traditional mechanical in structure, materials and techniques, Research shows that the friction and viscous force of the micro mechanical component surface have great influence to mechanical transmission, which is the key factor to service life of micro mechanical system.
This thesis is to use laser light as induction illuminant, combined with chemistry composite plating technology, to bring deposition about Ni-P/nano-C60 composite Coating on the micro mechanical component surface, so as to improve mechanics properties of tiny mechanical component surface effectively, and prolong the service life.
That is not conducive to keep its mechanical properties, so the best time for coarsening is no more than 6 minutes.
Under the laser’s affected, solution or matrix surface absorb energy of the laser, on the one hand it can heat the matrix and solution, on the other hand a changing temperature field distribution has been formed in solution.
Fig3 SEM micrographs of the composite coating surfaces laser-induced by different power 2.3 Experimental of fretting friction and wear behavior Tested fretting friction and wear properties of the two kinds of samples on the PLINT test machine, we can realize their wear resistances.
Online since: June 2010
Authors: Sutasn Thipprakmas, Masahiko Jin, Suthep Yiemchaiyaphum
This problem is the main factor which affects the quality of the fine-blanked parts.
The mechanical properties of workpiece were an ultimate tensile strength of 530 MPa and an elongation of 26%.
The bridge width is generally known as an important parameter which affects on the deflection of the product and material strip.
However, the bridge width also affects on the material flow features.
The results illustrated that the bridge width affected on the material flow feature as well as the amount of die-roll formation.
Online since: November 2012
Authors: Zeng Qiang Cao, Qi Liang Zhang, Yun Quan Chen
Riveting connection is extensively applied in aircraft structures, and riveting quality is an important factor affecting safety and fatigue performance of aircraft.
The riveting die angle apparently exerts an influence on the material flow, which further affects the stress and strain distribution.
The laminate material is the TC4 (Ti–6Al–4V) titanium alloy, which is widely utilized in aerospace and other weight critical applications due to its superior properties, such as high specific strength, etc [8,9].
The rivet is fabricated from TC16 (Ti-3Al-5Mo-4.5V) alloy, which is a kind of martensite strengthening (α + β) titanium alloy with good mechanical and processing properties, such as hot deformability, machine workability and corrosion resistance.
Due to the properties of low heat conductivity and high adiabatic shearing sensitivity, ASBs, an important thermoviscoplastic instability mode in metals processed at high strain rates, are easily observed in titanium and its alloys [12].
Online since: July 2011
Authors: Jian Zhang Li, Shi Feng Zhang, Ji Zhing Zhang, Jin Xue Jiang, Ying Ying Qiu, Cheng Li
Results and discussion Effect of reaction pH value on appearance properties of AP.
Effect of reaction pH value on appearance properties of AP is shown in Table 1.
Table 2 shows that the molar ratio (polyamine/modifying agents) of AP is closely related to its rheological properties.
Thermal properties of AP, SPA, and MSPA.
The molar ratio of AP and hot-pressing temperature were the main factors affecting bonding strength of the plywood.
Online since: November 2016
Authors: Hao Ran Wu, Christian Boller, Peter Starke
Consequently, safety factors can be defined more in accordance to structural needs, being of highest interest with respect to the increasing number of ageing infrastructure such as highways, bridges or others.
Traditionally, material response to cyclic mechanical loading is characterized by the plastic strain amplitude εa,p, determined in mechanical stress-strain hysteresis measurements [2].
Furthermore materials’ properties determined by these techniques are independent of a defined gauge length and also applicable to complex geometries like notched specimens or even components.
The physical quantities can be transferred from those localized but potentially critical spots and be directly related to microstructural changes in a bulk material of which the fatigue loading properties have been obtained with an approach such as PHYBAL or SteBLife.
Eifler, Fatigue assessment and fatigue life calculation of metals on the basis of mechanical hysteresis, temperature, and resistance Data, MP Materials Testing 51 (2009) 261-68
Online since: June 2017
Authors: Syahrir Ridha, Luluan Almanna Lubis, Riau Andriana Setiawan, Javad Mohar bin Razif Mohar
Elastic properties relate to the tendency of a material to maintain its shape and not deform when a force is applied to it.
The density of a medium is the second factor that affects the wave velocity.
Thus, sound will travel at a slower rate in the denser object if they have the same elastic properties.
While the density of a medium also affects the wave velocity, the elastic properties have a greater influence on the wave velocity.
Tenoudji, “Mechanical properties of cement pastes and mortars at early ages,” Adv.
Online since: June 2013
Authors: Yun He, Lin Ning Li, Cheng Yao Li, Long Chen, Xin Yue
Coating structures will affect the inserts’ life and the cutting heat distribution on chip, workpiece and insert.
The research of Rech showed that the coated inserts have better tribological properties than uncoated inserts such as smaller insert–chip friction, smaller insert–chip contact area, thinner secondary shear zone and lower temperature, which can reduce the heat transmitted into insert [1].
The result also shows that the friction of the coating surface will affect cutting force and total cutting heat.
On the heat partition properties of (Ti, Al)N compared with TiN coating in high-speed machining.
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture.2009,223,363-375
Online since: December 2011
Authors: Zheng Yi Jiang, Xing Zhong Zhang, Qing Guo Liu, Yan Chao Sun, Bao Jun Shi, Nuo Ran Shen
The temperature field affects the quality of slab directly.
At the same time, the temperature distribution could affect the distribution and magnitude of stress and strain and the production of defects during straightening of the slab.
Li and Thomas [6] constructed thermal-mechanical finite element model of the slab shell.
The property parameters of steel in high temperature change according to the temperature.
For calculating convenience, some unimportant factors are omitted, and assumptions are made as follows: (1) The slab with two meters length is taken into account.
Online since: August 2014
Authors: Zhao Gao, Ke Zhang
Many factors of the scene, such as lighting conditions, the measured object geometry and surface characteristics, noise and the camera features, are all concentrated in the image grayscale value, so image matching has been the focus of study in stereo vision field.
Although, the important geometrical property of epipolar line constraint of stereo vision system can provide certain facilities for image matching, the searching process along such epipolar lines is still very time-consuming and is affected seriously by noise.
When the mapping process of stereo vision system between 2D image coordinates of object points and 3D coordinates of scene is stimulated by the BP neural network, it is not need to build a complex system recovery model, and not need to consider the effects of lens distortion and environment factors, so this can reduce the error as a result of incomplete mathematical mode and improve the reconstruction accuracy of 3D coordinates.
Liu: China Mechanical Engineering, Vol. 14(2003) No.1, pp.9-12.
Mark: Neural Network Design (Mechanical Industry Press, China, 2002), pp.197-222.
Online since: September 2014
Authors: M.A. Martinez, J. Abenojar, N. Encinas
Introduction Polyolefins are being increasingly used in many applications due to their attractive properties, such as recyclability and lightweight, especially polypropylene and polyethylene due to their low cost.
Typical surface modification techniques for polymers include severe chemical oxidation [1] or mechanical processes [2].
The synergy of these two factors provoke lower values of polar water contact angles compared to the disperse diiodomethane.
An improvement on polar component is found in a higher extent when working with the torch than that of the vacuum chamber, thus a higher promotion of adhesion properties is expected.
Conclusions Plasma treatments are confirmed to be capable to increase polyolefinic adhesion properties without affecting bulk properties and with no generation of toxic waste (environmentally friendly processes).
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