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Online since: July 2019
Authors: Ehsan Toyserkani, Hamid Jahed, Bahareh Marzbanrad
It is shown that the thermal expansion coefficient (CTE) plays a critical role in residual stress development in the substrate and consequently affects the mechanical properties of the coated sample.
Furthermore, and after coating, the thermal mismatch, as a significant factor on the final residual elastic strain of the substrate, interferes with the developed strains during the coating.
Details of the substrate properties is found in [7].
∆λλ0=k×αSp+αδ∆T+k εm (1) where, Dl is the wavelength shift, l0 is the initial wavelength at the beginning of the experiment, k is the gauge factor, εm is the mechanical strain, αδ is defined by the change of the refractive index with temperature, αsp is the expansion coefficient of the sample (1/°K), and ∆T is the temperature change (ºK).
In these measurements, the 3mm grating length along the sample can be affected by the temperature changes, hence the measured wavelengths changes is the average of the temperature distribution in the entire substrate.
Online since: December 2013
Authors: Raed Hashaikeh, Lin Li, Hassan A. Arafat
The shape factors calculated by LEP, contact angle, and bubble point pore size are also shown in Figure 8.
Yang, Mechanical properties and biocompatibility of electrospun polylactide/poly (vinylidene fluoride) mats.
[28] Ran, X., et al., Thermal and mechanical properties of blends of polylactide and poly (ethylene glycol‐co‐propylene glycol): Influence of annealing.
Lim, Effects of annealing on the structural and mechanical properties of electrospun polymeric nanofibres.
Pai, Morphology and mechanical properties of electrospun polymeric fibers and their nonwoven fabrics, 2011, Massachusetts Institute of Technology
Online since: January 2013
Authors: Zhi Bo Li, Hui Xu, Gui Zhen Zhang
In conclusion, the response of unbonded flexible pipes are both related to its own structural properties and external loads.Coupling factors of different conditions should also be considered.
It is necessary to study the mechanical properties of unbonded flexible pipes.
(a) (b) Fig.1.Typical structure of unboned flexible pipe Mechanical model In order to consider various factors, individual and combined modeling methods were adopted in this paper.
External pressure directly affects the friction between adjacent layers, and thereby have greater effects on the pipe’s bending properties than internal pressure.
It should be noted that the coupling factors should be taken into consideration during overall assessment.
Online since: July 2019
Authors: Kanuengnit Pongpat, Surachai Dechkunakorn, Niwat Anuwongnukroh, Wassana Wichai, Peerapong Tua-Ngam
Twelve samples were used for testing the mechanical properties.
The archwire resistance to attachment into bracket slots and intensity of the force delivered to the teeth on unloading are mechanical factor that affect the tooth movement.
Mechanical properties and clinical applications of orthodontic wire.
Physical properties of root cementum: Part 18.
Physical properties of root cementum: Part 16.
Online since: August 2014
Authors: Tony Montesin, Virgil Optasanu, Pierre Jacquinot
A systematic investigation of the various factors (such as the residual stress, the surface pollution and the chemical composition of the oxidation atmosphere) is realized to separate their influence on the oxidation.
The main objective of this paper is to study the influence of the shot-peening on the oxidation by analyzing several factors: shot-peening duration, nature of the oxidant atmosphere, surface pollution and intensity of the stress values.
While the stress value is limited by the mechanical properties of the material, the stress gradient can reach very strong values if the variation of the stress is made within a very short length.
This is the proof that the mechanical state introduced during the shot-peening process is the main factor, and not the pollution, for the slower oxidation rate of the samples.
Summary The present works deal with the oxidation of shot-peened samples and investigate the influence of the main factors that can produce a slower oxidation of the shot-peened samples.
Online since: September 2011
Authors: Bin Zhao
The Finite Element Method (FEM) was used for axisymmetric indentation to investigate mechanics properties of piezoelectric solids (PZT-5H).
Introduction Piezoelectric materials with special electric and mechanical properties have been used in many areas such as actuators, sensors, and Microelectromechanical systems (MEMS).
All of these researches have proven that the indentation technique, as a tool, can be used to determine certain properties of piezoelectric materials.
Uncoupled Mechanical Case.
It indicates that polarization and the electric potential can affect the indentation load.
Online since: October 2010
Authors: Keizo Kobayashi, Suguru Tanaka, Mikami Masashi
Sb-doped Heusler Fe2VAl alloy was synthesized to evaluate the effect of heavy element doping on thermoelectric properties of the Heusler alloy.
The effect of the additional substitution on thermoelectric properties was investigated.
In contrast to the electronic properties, the additional Ti-substitution has little effect on the κ value.
Finally, ZT value was calculated from measured thermoelectric properties (Fig. 7).
Jones: The Theory of the Properties of Metals and Alloys (Clarendon Press, Oxford, 1936).
Online since: February 2022
Authors: Chen Guang Xu, Cui Liang, Jin Jun Tang
As shown in the Table 1, the mechanical property index of M172 piston aluminum alloy material is that the tensile strength of piston skirt at 25℃ is 280mpa and the elongation is 1%.
The safety factor is calculated according to 1.2, which will cause material damage and failure.
Wu, Effects of annealing temperature on the mechanical properties and sensitization of 5083-H116 aluminum alloy, Proc.
Case, Mechanical Properties of 5000 Series Aluminum Alloys Following Fire Exposure, TMS 2016 145th Annual Meeting& Exhibition, Springer, 2016, pp. 657–664
Tong, Effect of annealing temperature on microstructure, mechanical properties and corrosion behavior of Al-Mg-Mn-Sc-Zr alloy, Appl.
Online since: April 2004
Authors: Hidetoshi Somekawa, Kenji Higashi, Yukio Nishikawa, Akira Takara, Taisuke Sasaki
However, in order to be actually applied as a structural material, it is required to have sufficient mechanical properties such as meeting both reliability and safety.
The mechanical properties at room temperature and grain sizes on each material were summarized in Table 2.
These factors are considered to influence the variation in plane-strain fracture toughness.
Mechanical properties on present used AZ31 wrought magnesium alloy sheets Grain size, µm �0.2, MPa �y, MPa �UTS, MPa Elongation, % K1C, MPam1/2 KQ, MPam1/2 sample A 18 185 210 274 19 16.7 18.4 sample B 28 148 183 239 13 18.4 19.5 sample C 15 146 170 264 17 16.5 16.7 �0.2 is 0.2 % proof stress, �y is the yield stress, �UTS is the ultimate tensile strength, K1C is the plane-strain fracture toughness and KQ is critical stress intensity factor. 3.
There were no big differences in their mechanical properties and grain sizes in present used materials.
Online since: December 2014
Authors: Tao Yan, Gui Qin Jin, Ze Ding Wei
Reliability design for feeding system control circuit Fig. 1 Structural diagram of the control system Quality and properties of electronic components and electromagnetic compatibility of the system are the main factors, which affect the reliability of the electromechanical integration equipment control system.
Components High quality electronic components and mechanical parts are the bases of reliability for mechanical and electronic products.
Summary Found in the development process of the feeding system, even very similar equipment work in the vicinity of the system, electromagnetic interference factors are not the same, it suggests that some equipment itself also has certain electromagnetic compatibility problems.
Mechanical Reliability Design.
Beijing: Mechanical Industry Press (1995), p.2-3
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