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Online since: December 2010
Authors: Nai Fei Ren, Pan Wang, Yan Luo, Hui Juan Wu
However, parts sintered by the given materials are usually presence poor dimensional accuracy and low mechanical properties.These materials can not prototype industry production directly.
Polyamide (PA) is a semi-crystalline polymer with the attributes including low melt viscosity and well mechanical properties.
High-density polyethylene (HDPE) is a high-crystalline and non-polar thermoplastic resin with well thermal physics and mechanical properties.
They also analysed the mechanical properties of the sinter specimens, but the dimensional accuracy of the sinter parts were not considered in their studies.
The bonding between the layers will be very infirm that affect the part mechanics properties greatly if the thickness was too large for sintering.
Online since: May 2007
Authors: Hai Yan Jiang, Wen Bin Ding, De Hui Li, Shou Shan Yao, Xiao Qin Zeng
However, magnesium alloys have not been used for high performance applications due to their low mechanical properties in engineering applications, especially in some aggressive environments.
Therefore, it is important to improve the mechanical properties of magnesium alloy by means of surface engineering which without causing significant adverse effects on the properties of the base metal.
However, each of the coating techniques are limited by several main factors, such as weak interfaces between coating and substrate, need for vacuum chamber, extremely slow deposition, inconvenience operating and costly manufacturing procedure.
The available choices of silicon carbide particles (SiCp) are the most preferred reinforcements primarily because enhanced properties can be easily achieved with little or no penalty on density.
Sullivan, Wear. 65 (1980)1 Table 1 Comparison of the bend test properties of as-received AZ31 and GTA surface modified AZ31 with Al + SiC.
Online since: June 2012
Authors: Toshiki Hirogaki, Keiji Ogawa, Yota Takagi, Eiichhi Aoyama
We evaluated the mechanical properties under high temperature and humidity.
We then evaluated the remoulded binder-free composite’s mechanical properties.
Hence, the fibreboard’s degraded mechanical properties can be predicted because the bonding strength between fibres is insufficient.
(3) Wax protected binder-free composite from high temperature and humidity, but its mechanical properties became lower to some extent
Yamamoto, Development of bamboo-based polymer composites and their mechanical properties, Composites Part A, 35 (2004) 377-383
Online since: January 2012
Authors: Shuang Mei Li
These properties depend on the particular sensor design, rather than the output signal types [1].
Fig.5 PMOS Wheatstone bridge detection In order to improve the quality of sensitivity, metal coil through current in the magnetic field affected by the Lorentz force, Make the cantilever beam working at the second mode of resonance, and the quality factor is improved by designing like this .
Summary We have discussed the static and dynamic properties of the mcrocantilever and the ways to improve the sensitivity of mcrocantilever.
Mechanical behavior of ultrathin microcantilever[J].
Mechanical quantity sensitive device and its application [M].
Online since: September 2014
Authors: Giovanni Castellazzi, Daniela Ciancio, Francesco Ubertini
A recent study [2] has discussed the accuracy of the nodal elastic stresses of zero thickness interface elements when fictitious elastic parameters (often called penalty stiffness factors) are used.
All masonry configurations possess highly anisotropic mechanical properties due to the presence of discrete sets of mortar joints.
Mechanical properties are set as follows: Young's modulus E = 20200N/mm2, Poisson's ratio ν = 0.2 and the interface stiffnesses are set equal to: Kn = 2.0N/mm3 and Kt = 0.9N/mm3.
(a) real geometry (b) interface model (c) corrections Fig. 3: Test 2 - Rubble masonry: first activated interface Summary In this work, the corrections factors for the fictitious elastic stiffness of zero-thickness interface elements has been applied to a stone masonry wall.
The numerical Finite Element Analysis carried out on a full rubble masonry panel shows that, when no correction factors are used, the recovered nodal inter-element stresses led to a different cracking pattern.
Online since: October 2021
Authors: Paolo Di Sia
Graphene has particularly interesting chemical and physical properties, including high chemical and mechanical resistance, excellent thermal and electric transport, high transparency.
With regard to mechanical properties, a graphene sheet behaves similarly to a sheet of paper: when we try to pull it along the plane, it offers considerable resistance, but a small force is enough to bend it on itself.
- Composite materials with polymers, light and with high mechanical properties for aerospace uses
A purpose of the controlled surface oxidation is the realization of anchor points for extra surface groups aimed at the union of biomolecules (peptides, DNA, growth factors) by means of carboxylic groups [16-18]
Another parameter that strongly affects the applicability range of a sensor is its mechanical, thermal, chemical robustness.
Online since: July 2007
Authors: Hyun Chul Lee, In Yong Kim, Mi Kyong Yoo, Seog Jin Seo, Bom Chol Kim, Se Kwon Kim, Chong Su Cho
Chitosan (CS)/poloxamer semi-interpenetrating polymer networks (SIPNs) was prepared by crosslinking of poloxamer macromer in the presence of CS in order to improve its mechanical property required in skin tissue engineering application.
Their biodegradability and biocompatibility, together with their specific interactions with components of the ECM and growth factors, have led to their growing use in tissue engineering, such as in the repair of skin, liver, bone, and cartilage.
Blending or cross-linking of CS scaffold with other polymers is widely investigated for improving its mechanical or biological properties over a broad range.
The mechanical strength against compression and the water content were significantly improved by the SIPN system [4].
morphology can affect cell viability, proliferation and function, which is important for tissue engineering in the artificial skin system.
Online since: January 2009
Authors: Zhi Huang, Yun Huang, Xin Li, Su Qin Luo
Magnesium alloy matrix quality is important for the quality of coating on the surface, and thus affecting the final performance of magnesium alloy.
Among these factors, the most important are the machine tool inputs (including abrasive belt's velocity, feed rate, grinding depth).
Three factors and three levels are introduced to the orthogonal test.
The three factors were the abrasive Belt's velocity, grinding depth, feed rate, they all have three levels.
Magnesium: Properties-applications-potential [J].
Online since: October 2013
Authors: Sen Lin Li, Da Chun Yang, Feng He
The practice has shown that the design is feasible, there is not cold shut, misrun, scab, and oxidizing for the castings, and the requirements of mechanical properties can be met.
The practice has shown that the design is feasible, there is not cold shut, misrun, scab, and oxidizing for the castings, and the requirements of mechanical properties can be met.
Controlling the pouring temperature According to fast pouring mechanism, pouring temperature is one of the important factors which achieve the dynamic directional solidification of casting.
Conclusion It is feasible that the foundry technology was designed by the principle of directional solidification and fast pouring mechanism for the controlling board stainless steel castings with thin wall, uniform thickness, and no special mechanical properties.
Adopting this foundry technology, there was no shrinkage and dispersed shrinkage in A, its surface quality was greatly improved, and the requirements of mechanical properties could be met.
Online since: September 2014
Authors: Kristýna Šamárková, Ivo Kusák, Zdeněk Chobola, Daniela Štefková
To assess the state of corrosion we used frequency signal analysis, where we observed the changes in dominant frequencies and growth of damping factor λ.
A short-time mechanical impulse (a hammer blow) is applied to the test specimen and is detected by means of piezoelectric sensors placed on the specimen surface.
Longitudinal waves, which propagate within the rod at a speed of about 5100 ms-1, can affect the concrete element oscillations.
Bílek: Monitoring of Cement-based Material Solidification, Focusing on Electrical Properties.
Luňák: Measuring of Concrete Properties during Hardening.
Showing 8921 to 8930 of 26166 items