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Online since: January 2006
Authors: Hsiang Chen Hsu, Wei Mao Hung
This paper demonstrates the thermal-induced mechanical problems resulted from various temperature profiles of reliability test for a system-in-package (SIP) assembly process.
The flip-chip specimen was taken and the Moiré Interferometry was used as methodology to verify the developed Finite Element Model and material property.
The flip chip specimen was taken and the Moiré Interferometry was used as methodology to verify the developed Finite Element Model and material property [3].
This implies that passive SMD will not affect the thermal-induced stress/strain in all SIP plastic packages.
For thermal design, it is found that passive SMDs will not affect the thermal-induced stress/strain and FC chip is placed at the center of package will result in decreasing in the warpage in CSP solder bumps.
Online since: January 2010
Authors: Simona Constantinescu, Tamara Radu, M. Vlad
The literature points out that the welded pieces, cast or forged in Widmanstätten structures, are unsuitable as they make the steel fragile [2] and call for frequent corrections by heat treatment; that is why it is necessary to know the mechanism and kinetics of the factors affecting the crystallization of these structures, unlike those of Widmanstätten type.
S Hansen: Effects of Widmanstätten ferrite on the mechanical properties of a 0.2 pct C-0.7 pct Mn steel Metallurgical and Materials Transactions A, Volume 25, Issue 4 (1993) pp.763-773 [3] R.P.
Online since: December 2012
Authors: Rong Bao Dong, Miao Xie, Jun Meng, Wen Xin Xu, Jian Liang Wang
., Taiyuan 030053, China axiemiao1121@163.com, btymengjun@126.com, c412442029@qq.com, ddongrongbao112@126.com, eljn-22@163.com Keyword: forging equipment; liquid-air hammer; hydraulic system; AMESim; dynamic properties Abstracts: In order to optimize the dynamic characteristic of hydraulic system of large forging equipment.
Therefore, the simulation analysis of the factors affecting the response characteristic of hydraulic system is important to understand the dynamic characteristics of the system[4, 5]. 2 Working principle Main control valve group by more than one cartridge valve, valve block and high frequency response reversing valve.
China Mechanical Engineering,2004,03
Online since: September 2016
Authors: Y. Raja Sekhar, M. Ashwin Ganesh, Gaurav Ganti, Aushman Choudhury
However, these methods usually involve several mechanical parts and are usually designed for high capacity applications to be economically feasible.
Nomenclature c Specific Heat Capacity of Material, [J/KgK] f Focal Length, [m] h Convective heat transfer Coeff, [W/m2K] n No. of Standard Deviations v Wind Speed, [m/s] A Area, [m2] D Diameter, [m] I Direct Solar Radiation, [W/m2] L Thickness, [mm] Q Heat Transfer, [W] T Temperature, [K] α Absorbance ΔΨ Rim Angle Increment[°] Ψ Rim Angle[°] ε Emissivity σ Stefan-Boltzmann Constant[W/m2K4] β Surface Reflectance ρ Density[kg/m3] φ Interception Factor θ Inclination Angle of the Cavity Г Flux Capture Fraction f(x) Defined Function The focus of dish is calculated from the following equation.
Another vital component of the geometry is the intercept factor, which is the fraction of radiation intercepted by the parabolic dish.
In the design adequate care has been taken so that the vibrations may not affect the structural and optical properties of the dish.
The loss of solar insloation due to 1mm gaps in between the rings did not affect the final result much.
Online since: June 2019
Authors: Pavel Sulak, Petr Štěpánek, František Girgle, Vojtěch Kostiha, Ondřej Januš
It is well-known that test configuration affects bond behaviour of steel reinforcement, but this effect has not yet been sufficiently quantified when using FRP reinforcement.
The mechanical properties of the reinforcements used were experimentally determined before the tests (see Table 2).
Table 2: Mechanical properties of used reinforcement Bars Diameter of bar core [mm] Diameter of bar including surface treatment [mm] Average tensile strength [MPa] ± standard deviation Average elastic modulus [GPa] ± standard deviation GFRP.E.EP.K.14 14 15.23 980 ± 9.6 52.1 ± 1.6 GFRP.E.EP.N.14 14 15.02 654 ± 14.6 46.1 ± 0.8 GFRP.E.EP.II.N.14 14 14.27 872 ± 10.3 43.3 ± 1.3 GFRP.R.12 12 13.43 1445 ± 72.1 59.9 ± 0.4 Steel.14 14 - *574 ± 3.5 199.1 ± 7.7 * yield strength of steel reinforcement Modified beam test.
Cosenza, Experimental and analytical evaluation of bond properties of GFRP bars, Journal of Materials in Civil Engineering, 13(4), pp. 282-290, 2001
Kaklauskas, Mechanical Properties of the Bond Between GFRP Reinforcing Bars and Concrete, Mechanics of Composite Materials, 50(4), pp. 457-466, 2014
Online since: January 2022
Authors: Yuichiro Murakami, Naoki Omura
EMS is easy to increase size than the mechanical vibration method.
Therefore, the flow velocity and a resistance force on the solidification interface may have affected the areal ratio on α-Al particles.
Tada, Effects of Mechanical Vibration Factors on Size and Shape of Solid Particles in JIS AC4CH Aluminum Alloy Semi-Solid Slurry, Materials Transactions 57 (2016) 163-167
Omura, Development of Slurry Preparation Method by Applying Mechanical Vibration, Solid State Phenomena 285 (2019) 333-338
Wang, Microstructural evolution of thixomolded AZ91D magnesium alloy with process parameters variation, Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 444 (2007) 251-256
Online since: April 2004
Authors: Meng Kao Yeh, C.Y. Tsai
In this paper, the temperaturedependent properties of the underfill were established first.
The material properties of the solder bump are shown in Table 2 for analysis.
The material properties of underfill were measured using Instron-8848 micro test machine.
The material properties of the components in flip chip are shown in Tables 1 and 2.
(d) The change of the underfill fillet angle affects the package geometry.
Online since: June 2015
Authors: Mamoru Takahashi, O. Kamiya
Introduction Owing to its excellent properties, diamond is widely used in the industry, for cutting and polishing tools.
Nanocrystalline diamond has been investigated, due to unique properties of nanocrystalline diamond [3].
Effects of nitrogen addition on the properties of synthesized diamond films on WC substrate The nanocrystalline diamond films on the WC substrate were obtained using a mixture of high-purity acetylene and oxygen gas with nitrogen gas added.
Consequently, nitrogen is a very important factor for diamond nanocrystallites synthesis.
Singh, Microstructural and Biological Properties of Nanocrystalline Diamond Coatings, Diamond and Related Materials 15 (2006) 1935-1940
Online since: October 2010
Authors: John R. Nicholls, Richard G. Wellman, Remy Steenbakker, Jörg Feist
Thermal, physical and mechanical properties of the thermal barrier coating are influenced by its method of fabrication.
Secondly, small additions of dopants should not dramatically change the properties of the TBC, an important factor when it comes to industry acceptability.
Heyes (2000), Proceedings of the Institution of Mechanical Engineers, 214, Part I, 7-11. 23.
Wybourne, 'Spectroscopic Properties of Rare Earths', J.Wiley & Sons, Inc. (1965). 26.
Nicholls (2001), ‘Proceedings of Institution of Mechanical Engineers, 215 Part G, 333-340. 27.
Online since: April 2013
Authors: Vaycheslav N. Baumer, Katerina V. Terebilenko, Nikolay S. Slobodyanik, Igor V. Zatovsky
Synthesis, Structure and Luminescence Properties of Rare-Earth Double Phosphates Katerina V.
It has been shown that introduction of rare-earth ion into mixed matrix may affect not only matrix luminescence properties, but also reveals W-O and RE-O charge transfer transitions [5].
The third solvent MI2MVIO4 with the most basic properties gives MI3Ln(PO4)2 for the whole set of rare-earth ions.
Férid, Combustion synthesis and luminescence properties of LaPO4:Eu (5%), J.
Champion, Microstructural dependence of the thermal and mechanical properties of monazite LnPO4 (Ln = La to Gd), J.Eur..
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