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Online since: May 2006
Authors: Jorge Cruz Fernandes, Fernando A. Costa Oliveira, Susana Dias
It should be noted that R does not take into account the thermal properties of the material, which can have a substantial effect on ψ.
The main physical properties of the materials under investigation are listed in Table 1.
Summary of the physical properties of both dense bars and cordierite foams.
It must be realised that a change in cell size or density can lead to significant changes in the microstructure of struts, the number of closed-cell windows present and so on, and these factors can strongly influence the mechanical properties and the thermal shock resistance of ceramic foams.
Ashby: Cellular Solids: Structure and Properties (Cambridge University Press, U.K., 1997) [5] V.R.
Online since: September 2020
Authors: Singh Amares, Bandar Tchari
Overall, the addition of the TiO2 nanoparticles showed a clear influence on the Sn-Bi properties.
In the current electronic industry, the low melting temperature is a concern, and tin-lead (Sn-Pb) solder alloy has shown the lowest melting temperature with unique physical and mechanical properties [3].
Various Pb replacements have been investigated, including; In, Sb, Ag, Bi, Zn, Cd, Al, as the alloying element to the Sn, and most of them tend to provide better mechanical properties [4].
Among the crucial factor that affects the strength of any solder alloy and provides the solder the ability to withstand shear and tensile stresses is the intermetallic compound (IMC) layer formed between the solder alloy and the substrate [10].
Microstructure and mechanical properties of Sn–xBi solder alloy.
Online since: November 2023
Authors: Sung Il Kim, Jewoong Lee, Youngroc Im
In this paper, the mechanical properties resulting from the difference in the microstructure of the 780MPa grade hot-rolled and HDG(Hot Dip Galvanized) CP steels, especially the important stretch-flangeability characteristics as they are frequently used as control arm parts, will be discussed.
Table 2 shows tensile properties and HER (Hole Expansion Ratio) of uncoated and coated hot-rolled 780CP steels.
Reducing the hardness difference between phases in microstructural constituents is a key factor for improving stretch flangeability of AHSS.
Tensile properties and HER of PO/HGI 780CP steels Steels YS, MPa UTS, MPa YE, % T-El, % HER, % Uncoated 780CP 697 798 - 18 61 Coated 780CP 742 795 1.1 17 72 Fig. 3.
In addition, heat treatment prior to Zn-coating is required to perform HDG, which may change the mechanical properties of uncoated and coated materials.
Online since: June 2011
Authors: Hidenori Terasaki, Yu Ichi Komizo
The microstructure is one of the factor concerning to cold cracking problem.
The first application is the tracking the microstructural change along various thermal cycle simulating heat affected zone.
These factors contribute to fine microstructure formation.
Thus, to secure good mechanical properties in the weld metal, it is important to understand the mechanism of intragranular acicular ferrite formation.
And it is expected that the acicular ferrite is formed in the heat-affected zone.
Online since: July 2016
Authors: Jaime Gonzalez, Christian Carloni, Tommaso D'Antino, Carlo Pellegrino, Lesley H. Sneed
Although each batch was prepared in the same manner and the specimens were cured in the same way, the matrix mechanical properties obtained are slightly different.
On the other hand, it appears that the different mechanical properties of the matrix batches employed did not affect the load responses.
This evidence suggests that the inherent bond between matrix and fibre, rather than the mechanical properties of the matrix, plays the fundamental role in determining the load-carrying capacity of FRCM-concrete joints [14].
The different mechanical characteristics of the matrix did not appear to affect the load responses.
[17] ASTM INTERNATIONAL, “Standard test method for tensile properties of polymer matrix composite materials”, ASTM D3039/D3039M-08, West Conshohocken, USA, 2008
Online since: April 2014
Authors: Li Li Zhu, Xi Rong Wu
Soil base resilience modulus is the main mechanical parameters reflecting the subgrade bearing capacity.
In addition to the special properties of loess soil, there are many other factors which lead to the diseases, including improper construction control, lack of filled soil compaction, poor drainage and unqualified materials.
Resilient modulus directly affects the pavement design, while,due to many testing method of resilient modulus and the influence factors such as soil, climate, geographical conditions and test method.
Online since: October 2006
Authors: H. Wang, X.D. Yao
It uses solidification conditions rather than mechanical or electromagnetic stirring to control nucleation, nuclei survival and grain growth, and then achieve a fine-grained and non-dendritic microstructure for semisolid casting.
Solidification conditions, such as melt superheat, mould preheat temperature, cooling rate and thermal properties of the mould material, are the factors that influence the wall crystal formation, survival and growth, which then affect the final microstructure.
Results and Discussion Thermophysical properties of the alloys used in the simulations are presented in Table 1.
Table 1 Thermophysical properties of Al-Si alloys [10] Effect of alloy composition and mould preheat temperature.
Lower temperature gradient is also a positive factor to columnar-equiaxed-transition. 300°C 350°C 450°C 500°C Figure 2.
Online since: March 2006
Authors: Yu Yong Jiao, X.C. Xu
Special emphasis is on: 1) deriving a ordinary differential equation about the failure surface function; 2) obtaining a new analytical solution of the failure surface by Legendre transform; 3) discussing the effect of the filler's properties on the failure surface.
The mechanical parameters of the backfilled clay are: 20c kPa= , 16ϕ= o , 3 18 /kN m γ= , respectively.
Discussion: the effects of the soil properties on the acrθ In the design of a retaining wall, the filler's properties, including , , ,wc ϕδ γ, can significantly influence the value of acrθ , as demonstrated in Fig.2 (b).
In this paper, based on vertical differential element method and the variational principle, a new analytic solution to determine the actual failure surface in the backfilled clay is derived, and the effects of the filler's properties and the smoothness of the retaining wall are discussed.
Further analytical investigation is needed to clarify the effect of the variation of the backfilled clay's properties and smoothness of the retaining wall's back.
Online since: April 2014
Authors: Feng Liu, Nan Pan, Xing Wu, Jun Zhou, Yi Liu
Study of Intelligent Evidence Management System Liu Feng1, a, Wu Xing1, b*, Pan Nan1, Zhou Jun1, Liu Yi2 1Faculty of Mechanical & Electrical Engineering, Kunming University of Science & Technology, Kunming 650500 2Kunming Snlab Tech Co.
Introduction Facts of a case are proved by the physical evidence with its external characteristics and material properties [1] in the public security department.
(3)The strict authority management and real-time monitoring environmental factors are carried out in system construction in order to keep the data safe.
Physical evidence room is the vital place for keeping evidences and the quality of evidences is directly affected by its environment.
Compressor, blower, dehumidifier, temperature sensor, humidity sensor and other equipment are installed in the room to control environmental factors which satisfy the demands of evidences.
Online since: March 2011
Authors: L. Zhou, G.Q. Pan, X.R. Liang, Yong Ze Guo, Z.R. Liao
Introduction Using nano-indentation to test material properties has become an important means of researching mechanical properties of material in nano-scale.
Thus, we decide to introduce correction factor to characterize pile-up.
The indentation energy method improved considers the affect of pile-up, and the hardness are more closer to actual hardness.
But they don’t consider the affect of pile-up, and the hardness calculated are higher than normal, which should be improved.
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