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Online since: March 2008
Authors: Heng Zhi Fu, Lin Liu, Jun Zhang, Hai Jun Su
At present, Ni-base superalloys are the most primary structure materials of choice for high temperature turbine blade applications as they satisfy a unique combination of desired properties.
As the application temperature further increases, the mechanical properties show a sharp deterioration due to the serious surface degradation in service.
It is considered to be very hopeful to become the thermostructural material with outstanding mechanical properties even close to its melting temperature if its mechanical property especially the room-temperature ductility could be evidently improved [1].
During the laser zone remelting and rapid solidification process, laser scanning rate and power density are the most key influence factors determining the eutectic growth.
The addition of zirconia and fine rapid solidification microstructure contribute to the improved mechanical properties.
Online since: February 2018
Authors: Lian Jin Li, Si Qi Liu, Xing Han
Due to the problems that the rolling force of seamless steel tube during tandem rolling process is affected by many factors, the calculation is complex and the accuracy is not enough.
The movement style of mandrel affects the deformation of the metal [7-8] and the work of roller through the metal.
Study on workpiece vs mandrel velocity and friction factor relationship of fully-floating mandrel mill(Part Ⅲ), J.
Development of pipe cold pilger rolling mode computation method with account of metal properties change, J.
Study on workpiece vs mandrel velocity and friction factor relationship of fully-floating mandrel mill(PartⅠ), J.
Online since: January 2013
Authors: Yong Jie Liu, Chao He, Qingyuan Wang
Very high cycle fatigue (VHCF) properties of welded joints under ultrasonic fatigue loading have been investigated for titanium alloy (TI-6Al-4V) and bridge steel (Q345).
In this research, the ultrasonic fatigue testing was adopted to investigate the ultra-long life fatigue properties of welded joints for bridge structure steel Q345 and titanium alloy TI-6Al-4V.
The chemical compositions in wt.% and mechanical properties of these materials used in this investigation are shown in Table 1 and Table 2.
Table 1 Chemical composition of Q345 and TI-6Al-4V Material C Si Mn S P Q345 0.15 0.38 1.36 0.00003 0.00012 Material Ti O Fe Al V TI-6Al-4V 0.91 0.002 0.004 0.055 0.035 Table 2 Mechanical properties of Q345 and TI-6AL-4V Material E /GPa /MPa UTS/MPa /g.cm-3 Q345 201 420 570 7.85 TI-6Al-4V 114 880 950 4.43 Fig.1The dimensions of specimen for Q345 and TI-6Al-4V.
Influence of Subjection to Physiological Saline Solution on Gigacycle Fatigue Properties of TI-6AL-4V.
Online since: August 2020
Authors: Prasert Akkaramongkolporn, Theerasak Rojanarata, Praneet Opanasopit, Prasopchai Patrojanasophon, Thapakorn Chareonying
The physiochemical properties of the tablets and the release profiles of fluorescein from the 3D-tablets were investigated.
The 3D-printed PVA tablets were successfully produced with favorable physical and mechanical properties.
Each type of filament has different properties and applications.
Conditions for thermal crosslinking, including crosslinking temperature and crosslinking time, are important factors affecting the applications of the polymers.
Therefore, the physical properties of 3D-printed tablets were satisfactory.
Online since: June 2012
Authors: Jian Zhuang Xiao, Hong Li
There are mainly two factors relating to the larger shrinkage.
Zhang, Mechanical properties of recycled aggregate concrete under uniaxial loading, Cement and Concrete Research. 35 (2005) 1187-1194
Khatib, Properties of concrete incorporating fine recycled aggregate, Cement and Concrete Research. 35 (2005) 763-769
Wang, A review on long-term properties of recycled aggregate concrete, Structural Engineers. 21(3) (2005) 73-76.
Ryu, An experimental study on the effect of recycled aggregate on concrete properties, Magazine of Concrete Research. 54 (1) (2002) 7- 12
Online since: January 2010
Authors: Akira Watazu, Ichinori Shigematsu, Xin Sheng Huang, Kazutaka Suzuki, Naobumi Saito
The AZ61 magnesium alloy was subjected to the differential speed rolling at different rolling conditions including reduction per pass, rotation speed ratio and rolling temperature, and the influences of the rolling conditions on microstructure, texture, mechanical properties and formability of the as-rolled sheets were investigated.
Introduction Magnesium (Mg) alloys have attracted interest due to their excellent specific properties that make them potentially suitable candidates for replacing heavier materials including steel and aluminum alloys in automotive and electronic industries.
In this study, the AZ61 alloy was subjected to the DSR at different rolling conditions including reduction per pass (RPP), rotation speed ratio (RSR) and billet temperature, and microstructure, texture, mechanical properties and formability of the as-rolled sheets were investigated aiming at an achievement of the Mg alloy sheet with a combination of a high strength and a superior formability.
The average values of the mechanical properties were given from the values of the three tensile directions by the following expression: )/4TDXº45X2 RD X(X ++= .
Summary The influences of the rolling conditions on microstructure, texture, mechanical properties and formability of the as-rolled AZ61 alloy sheets were investigated.
Online since: August 2004
Authors: Seong In Moon, Yun Jae Kim, Ja Choon Koo, Young Jin Kim
Measurement of mechanical properties of a thin large crystallized material such as TFT-LCD panel is challenging with traditional material testing equipments.
Accurate measurement of the properties often requires very expensive facilities.
Although computational resources and algorithms might be the primary factors for obtaining higher accuracy of the numerical simulations, obtaining accurate material properties is to be a considerably important parameter for the accuracy.
Many publications are available for the measurement of mechanical properties using various equipments other than tensile test machines.
A trial combining numerical and empirical methods for the estimation of mechanical properties is presented for laminated structures [3].
Online since: October 2012
Authors: Md. Alhaz Uddin, Mohammed Jameel, Habibur Rahman Sobuz, Noor Md. Sadiqul Hasan, Md. Shahinul Islam, Khan Mahmud Amanat
There are many factors that affecting strength development of concrete including curing.
The main factors for appropriate curing are temperature of curing and moisture curing duration.
At the early stage temperature increase performance of mortar but decrease at later age were investigated by the change of mechanical and physical properties of mortars [4; 5].
Materials properties Aggregate.
The physical properties of fine and coarse aggregate are shown in Table 1.
Online since: March 2004
Authors: Gérard Bernhart, Philippe Lours, H.V. Bui, Abdelhak Nafi, Omer Mercier
For the laser sintering process, a particular attention is paid to the description of the raw metal powder and the influence of process parameters on the microstructural and mechanical properties of the consolidated material.
Fig. 2 shows how the Vickers hardness varies across the brazed bond, confirming the fact that the steel microstructure is affected by the bond (see Fig. 3).
In fact, the main factor is the temperature profile.
The objective of the research is to understand the relationship between the microstructure of the consolidated materials and their mechanical and thermal properties.
Mechanical properties of the bulk sintered material.
Online since: June 2007
Authors: Yoshiharu Mutoh, Jin Quan Xu, Yong Liu
The mechanical properties and the chemical composition of SM430A are Extension meter 20 2 2 45 90 12 6 Strain gage Specimen Contact pad (a) (b) Fig.1.
Theoretically, the shape change caused by the plastic strain can be directly calculated by adopting the finite strain analysis, but it will take much longer computation time than that for small deformation analysis due to the geometry nonlinear properties.
Analysis model and its element division Table 1 Mechanical property of SM430A Table 2 Chemical composition of SM430A analyzed first.
After the plastic deformation is saturated, the stress distribution, which is saturated too, is the dominative factor of fretting wear.
The wear depth of specimen may affect the wear width.
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