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Online since: March 2011
Authors: Paolo Scardi, Matteo Leoni, Kenneth R. Beyerlein, Robert L. Snyder
Introduction The measurement of deformation fault probabilities is important to understand the mechanical properties of bulk nanograined materials as well as the structure of synthesized nanoparticles.
Here a simulation approach was employed as the level of precision and control allows for a systematic study of the many factors influencing the pattern.
Also the same atomic structure factor and polarization factor were applied to the small-angle pattern to be consistent with the Debye Function calculation.
The use of this scale parameter as well as the necessary polarization and atomic scattering factors, allows for a direct match of the PM2K modeled pattern and the Debye pattern without the use of a background function.
The variable scale factor was always found to be 1.0, which is a further verification of the normalization and analytical scale factor used.
Online since: January 2016
Authors: Yorinobu Takigawa, Kenji Higashi, Tokuteru Uesugi, Hiroyuki Watanabe
Superplastic properties of AZ91 alloy.
Superplastic properties of AM60 alloy.
The difference implies that other factors besides grain rotation give rise to the difference in texture evolution during superplastic deformation and the texture evolution cannot be explained by diffusional accommodation mechanism.
We were concerned that the interphase boundary between magnesium matrix and β phase in AZ91 might affect the contribution of GBS to the total strain.
Mukai, Texture and mechanical properties of superplastically deformed magnesium alloy rod, Mater.
Online since: November 2025
Authors: Ru Sheng Wei, Kai Li Mao, Liang Qiao, Tian Li, Yu Peng Gao, Guo Hong Wang, Hong Wei Liu
These properties significantly enhance the processing capability of power devices and enable them to meet the requirements of next-generation power electronic equipment for power devices for higher power, smaller size and operation under harsher conditions.
Owing to excellent physical properties and performance advantages, silicon carbide semiconductor materials and devices are leading the future development of power electronic systems in key industrial field such as new energy vehicles, 5G communications, semiconductor lighting, smart grid, and AR glasses.
However, the residual stresses accumulated at the edges of large-size SiC crystal can easily cause deformation or cracking during processing, which becomes a key factor in reduce the yield and performance of the devices [8].
Mechanical stress analysis further indicates that the directions of principal stresses and principal strains within the material coincide.
Residual stresses caused by mechanical processing are generally confined to the surface and can be removed by surface polishing.
Online since: June 2014
Authors: Jing Liu, Jing Tao Han, Shuai Ji, Xing Wen Yang
In Fig.3 (b), it could be observed that the hardnesses of the complete plates’ core layer were largely affected by heat treatment.
Since ordered phase was the main factor leading to the sharply increasing of material’s hardness and brittleness, restraining the formation of ordered phase or decreasing the material’s ordered degree could reduce the material’s hardness [9].
These factors resulted to the decreasing of the hardness of composite plate compared with the hot rolled ones.
Ye.Mechanical and Magnetic Properties of Cold Rolled 0.02C-6.56Si High Silicon Steel Sheet[J].Special steel, 2007, 28(3): 28-28.In Chinese [4] H.
Online since: January 2010
Authors: W.D. Jin, Guo Xing Tang
Introduction With the development of new materials and maching technologies, more and more structural ceramic parts are used to substitute for metal counterparts due to their excellent physical, chemical and mechanical properties [1] .
However, grinding effect and efficiency of ELID technology wasn't well-pleasing because of non-liner electrolysis action and multiformity or complicacy of influence factors.
In the grinding experiment, workpiece's material was hot press sillicon nitride and it's dimension is 20×20×12mm, preinstall peak voltage was 120V whose pulse width was 5μs and duty factor was 50%.
Correspondingly, contact stress between wheel and workpiece was slackened off, surface quality and machining effiency of workpiece would be affectted.
Analyzed cause for temporary decrease of space lies in that wheel's expand caused by heat is main factor after machine tool start no long time.
Online since: March 2010
Authors: Zhi Min Zhang, Shao Jin Yan
Process decision-making is the core of CAPP, and as the process is affected by the factors such as manufacturing resources, part structure, surface shape, etc. the processing sequences and methods possess indetermination.
In polychromatic sets, not only its elements, but also its entirety can be pigmented with different colors to represent the research object as well as the properties of its elements.
The concept of contour which is the abstraction and generalization of technical concepts such as nature, property, parameter, characteristic, indicator, etc. replaces the purely mathematical term "color" in the polychromatic sets and polychromatic graph.
Duan : Mechanical Science and Technology, Vol.17 (1998), p. 651-652, in Chinese
Online since: February 2014
Authors: Shu Qi Li, Hong Yuan Fang, Xuesong Liu
Residual stress is also the main factor that induces stress corrosion of the components and reduces their fatigue life.
Mechanical grinding is one alternative method[5] to release residual stress.
Only a few researches on the effect of VSR on LAHSS have been reported by now[10,11], and even fewer researches on the effect of VSR on the microstructure and properties of LAHSS.
A major concern about residual relief methods is their impact on the metallographic microstructure and mechanical performance of the components.
The VSR treatment does not affected the metallographic structure of the materials.
Online since: February 2012
Authors: Wei Zhu, Yan Zhu Yang, Hong Bo Li, Xue Tao Zhao
Multi-resolution Analysis of Critical Dimension Line edge roughness Yang Yan-zhu1,a , Wei Zhu2,b, Hongbo Li, Xuetao Zhao3,c 1College of Mechanical Engineering, Donghua University, Shanghai, 201620, China 2College of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081,China 3College of Mechanical Engineering, Shandong University of Technology, Zibo, Shandong, 255049, China ayangyz@dhu.edu.cn, bwei.zhu@bit.edu.cn, cxuetaozhao@sina.com.cn Keywords: nano-scale measurement, line edge roughness, wavelet analysis Abstract.
Surface feature of the line is an important influece factor of electrical performance of IC.
The accuracy of the baseline will directly affect the accuracy of the measurement and evaluation results.
Advances in Resist Technology and Processing XX, Theodore H, Fedynyshyn, Editor, Proceedings of SPIE[C] Vol. 5039(2003): 384-392 [6] Odo Wunnicke et al, Surface properties and topography of 193nm resist after exposure and development [A].
Online since: October 2014
Authors: Vlad Andrei Ciubotariu, Aurelian Albut
If the structure is incorrectly designed or the structure presents material and geometric imperfections the regular folding process is affected by global bending.
Tab.1 Basic mechanical properties of the materials in discussion Characteristic I II TWB Tensile strength [MPa] 410.95 418.48 432.88 Yield stress [MPa] 177.77 230.43 245.57 Coefficient of resistance K 518.05 528.19 541.86 Strain hardening exponent n 0.213 0.161 0.157 Fig.1 Characteristic stress-strain curves for the parent materials and TWB assembly There were used three types of cross-section geometries: rectangular, pentagonal and hexagonal.
In order to obtain the mechanical characteristics of the adhesive solution the shear strength single-lap tests and T-peel strength tests were performed.
The strain rate effect was accounted by using the Cowper and Symonds model that scales the flow stress with the factor 1+ (έ/C) 1/P.
Acknowledgement The author gratefully acknowledge the financial and technical support of CCIMT Research Centre from “Vasile Alecsandri” University of Bacau – Romania References [1] Somya P., Some analytical methods of plastic collapse of circular steel tube under quasistatic axial compression, The 19th Conference of Mechanical Engineering Network of Thailand, 19-21 October 2005, Pheket, Thailand [2] Rusinek A., Zaera R., Forquin P., Klepaczko J.R., Effect of plastic deformation and boundary conditions combined with elastic wave propagation on the collapse site of a crash box, Thin-Walled Structures, 46 (2008) 1143-1163 [3] Ciubotariu V.A., Theoretical and experimental research regarding the influence of the weld line on the quality and resistance characteristics of the drawn parts made from tailor welded blanks, Ph.D. thesis, “Vasile Alecsandri” University of Bacau, Romania, (2011) [4] Abramowicz W., Wierzbicki T., Axial crushing of multi-corner sheet metal columns, Journal of Applied
Online since: September 2014
Authors: D.B. Wei, Z.Y. Jiang, Haina N. Lu
Jiang School of Mechanical Materials and Mechatronic Engineering, University of Wollongong, Wollongong, Australia * Corresponding author: H.N.
Micro cross wedge rolling (MCWR) inherits most of the advantages of the conventional-scale process such as high productivity, minimized material consumption and excellent mechanical properties, but the common issues was also carried on during miniaturization [2].
Size effect has been sub-divided into three categories: density, shape, and microstructure size effect, all of which determine the individual or combined dimensional accuracy of the micro-product because the deformation behaviour of the work material, e.g. material flow and recoverable deformation, is affected by them to different extents [3].
As one critical factor that determine the accuracy of the micro product, springback was focused on and the experimental and numerical results were analysed to eliminate its influence on product quality.
The springback in the micro domain cannot be predicted using conventional mechanical theories and its behaviour in MCWR was relevant to the material microstructure and the amount of deformation discerned by the nonlinear springback mechanism associated with the theory of dislocation density.
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