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Online since: June 2014
Authors: Feng Hua Zhou, Yu Xuan Zheng, Shi Sheng Hu
The technique is useful for the studies of the dynamic tensile deformation and the fracture (fragmentation) properties of ductile metallic materials.
Understanding the fragmentation properties of solids is important to the researchers in the fields of physics, mechanics, aerospace and defense engineering.
However, the joule heating resulted from the large electric current in the ring specimen brings a remarkable temperature rise, which may change the mechanical property of the specimen being tested.
Whether electromagnetic loading or explosive loading are applied, there are two pivotal factors that prevent the wide acceptance of the techniques: the complicated experimental technique and the expensive experimental equipment.
Measurement of dynamic plastic flow properties under uniform stress. in Symposium on the Dynamic Behavior of Materials: ASTM Special Publication.1963
Online since: January 2016
Authors: Qiu Lian Dai, Can Bin Luo, Jing Feng Liu
Experimental Study of Fabrication of cast-Iron bonded cBN grinding wheels by V-EPC (I)----The Influence factors on the Qualities of Grinding Layer Qiulian Dai 1, a *, Canbin Luo 2,b and Jingfeng Liu 3,c 1,2,3 MOE Engineering Research Center for Brittle Materials Machining, Huaqiao University Xiamen, Fujian, 361021, P.R China a lisadai@hqu.edu.cn, blcbrobin@hqu.edu.cn , cljf_027@163.com Keywords: cast-Iron bonded, cBN grinding wheels, V-EPC, Casting Parameters, Microstructures, Thermal Damage.
Therefore, the bond of the cBN grinding wheels must have a high strength, wear resistance and good grain retention properties.
Austenite-bainite ductile iron is an important commercial engineering material because of excellent properties such as high strength with good ductility as well as good fatigue strength and fracture toughness together with excellent wear resistance[2].
These properties are as a result of a microstructure composed primarily of acicular ferrite (banite) and high carbon austenite.
By exploring V-EPC process to fabricate the metal-bonded cBN grinding wheels, higher retention ability of the metal matrix for cBN grits is expected due to the increase of the mechanical locking and the chemical bonding between the metal bond and cBN grits.
Online since: April 2013
Authors: Yan Gao, Hai Shan Li, Ya Zhou Jing, Guo Jun Zhao
Regarding to the residential buildings, the condition of its thermal properties finally manifests through the architectural form and thermal performance of building enclosure.
It affects not only the possible solar radiation heat gain, but also the heat exchange between indoor and outdoor.
But in the former study, using mode of residential building has not been considered as one factor that influences the energy consumption of air conditioning.
Based on these, nature priority and all mechanical modes of the residential building are designed in this paper.
This differs from the results under all mechanical mode.
Online since: July 2020
Authors: Akhmad Herman Yuwono, Ghiska Ramahdita, Rowi Alfata
To prevent this phenomenon, the scaffolds need to be modified in order to provide antibacterial properties.
To overcome this problem, the researchers developed scaffolds provided by antibacterial properties.
Zinc oxide was chosen due to its superior properties compared to other antibacterial agents in which zinc oxide not only provides antibacterial properties but also promotes the growth and attachment of new bone cells [8].
The Effect of Zinc Oxide on Antibacterial Properties of Scaffold Antibacterial activity testing conducted to find out if there were antibacterial effects produced by scaffolds with the addition of zinc oxide.
Incorporation of Zinc Oxide Nanoparticles into Chitosan-collagen 3D Porous Scaffolds: Effect on Morphology, Mechanical properties and Cytocompatibility of 3D Porous Scaffolds.
Online since: November 2013
Authors: Christine Sarrazin-Baudoux, Jean Petit, Michel Gerland
It is shown that temperature and air humidity do not affect the crack growth resistance of the peak aged 2022 while these two parameters widely influence the crack growth in the under-aged alloys which exhibit in cold air a crystallographic retarded propagation similar to that in vacuum.
Introduction Due to their good specific mechanical properties, Aluminum alloys are widely used for constitutive parts of aircrafts and thus weight saving is a strategic issue in aeronautics.
New generation aluminum alloys are developed to improve their specific properties including damage tolerance through optimization of microstructures.
The main mechanical properties at room temperature and 223K are listed in Table 1.
Figure 1: Microstructure of the studied materials: a) 2024A alloy and b) 20022 alloy Table 1 Mechanical properties of the studied alloys at 300K and 223 K   300 K 223 K R0.2 (MPa) Rm (MPa) A% R0.2 (MPa) Rm (MPa) A% 2022 T351 291 395 27.1 304 406 27.1 T851 381 443 14.0 394 456 14.5 2024A T351 356 467 21.2 364 474 24.0 Fatigue crack growth tests were performed on a servo hydraulic testing machine under load control.
Online since: February 2016
Authors: I. Ostrovskii, V. Lichodievskiy, N. Vysotskaya, A. Korsak, A. Klimovskaya, Yu. Chaikovsky
A key problem of this research is a lack of “know how” to test the physicochemical state of the interface and to control its properties.
The key problem of all this research is to understand the physicochemical state of the interface and to develop methods to obtain the prespecified properties.
It has been demonstrated that the adhesive properties of silicon wire arise from its interaction with the physiological environment.
Gander, Effect of controlled co-delivery of synergistic neurotrophic factors on early nerve regeneration in rats.
Basu, Crystalline Silicon - Properties and Uses (InTech, Rijeka, 2011) p. 23-42.
Online since: August 2020
Authors: Asad A. Khalid
In general, several factors affect the performance of adhesive joint such as the method of bonding, surface condition and properties of bonded materials, and design parameters of the adhesive joint [13].
Dimensions of the single lap adhesive joint of composite laminates No Material Interface geometry A, [mm] H, [mm] A/H 1 Sisal/epoxy Straight-flat 0 5.87 0 2 Sisal-glass/epoxy 0 5.94 0 3 Glass/epoxy 0 6.15 0 4 Sisal/epoxy Triangular 2.42 6.2 0.39 5 Sisal-glass/epoxy 2.4 6.24 0.38 6 Glass/epoxy 2.41 6.15 0.39 7 Sisal/epoxy Rectangular 2.39 6.09 0.39 8 Sisal-glass/epoxy 2.42 5.95 0.41 9 Glass/epoxy 2.4 6.08 0.39 10 Sisal/epoxy Semi-circular 2.41 5.97 0.40 11 Sisal-glass/epoxy 2.38 6.15 0.39 12 Glass/epoxy 2.39 6.27 0.38 Mechanical properties of the fibres and matrix material used are listed in Table 2.
Pu, Effect of temperature on the mechanical properties of adhesively bonded basalt FRP-aluminum alloy joints in the automotive industry, Int.
Huang, Effect of environment conditions on adhesive properties and material selection in composite bonded joints, Int.
Du, The influence of surface treatment on the tensile properties of carbon fiber-reinforced epoxy composites-bonded joints, Compos.
Online since: December 2007
Authors: Hong Tsu Young, Wei Yen Lin
3D Micro-scale Profile Measuring System Hong-Tsu Young1, a and Wei Yen Lin 2,b 1 Professor, Department of Mechanical Engineering, National Taiwan University 2 PhD Candidate, Department of Mechanical Engineering, National Taiwan University a hyoung@ntu.edu.tw, bd93522009@ntu.edu.tw Keywords: 3D non-contact Measurement, Image Processing, Focus Algorithm.
The properties of images were enhanced by image processing techniques including discrete Gaussian filtering, histogram equalization and high-boost filtering.
Specifications of video capture card Manufacturer Euresys Type PICOLO Working Voltage 1V Image Input RS170 PCI 32 bits, 33 MHz Analysis of measuring precisions In this research, we analyzed 3 factors which affect the precisions of the measurement: Roughness, Algorithm and stability.
Fig.9 Distribution of focus degree with roughness Fig.10 Focus Degree and different algorithm Stable Factor.We used a white rectangle with one of its corner located on a specified pixel.
During the measuring process, some factors, like insufficient strength of light source, and vibration, were found leading to poor-quality (much noise or vague features) images.
Online since: November 2012
Authors: Shuai Luo, Hong Jun Liu, Quan Sheng Yan
To overcome cable vibration problems, a common practice is to install mechanical damper to connect the cable to the bridge deck, and a number of control methods have been proposed to mitigate cable vibrations.
Fujino and Hoang analyzed the effects of bending on the modal properties of a stay cable with a transverse damper [4].
The current widely used by researchers in the theoretical model assumed that the damper is fixed outside of the deck, and the non-idealized factors such as support flexibility are neglected in the idealized mitigation analysis model, is not reasonable to consider the bridge deck-cable-damper coupled vibration impact caused by the motion of the bridge deck and viscous damper non-idealized characteristics.
Parametric Analysis Parameters such as the anchor location, inclined angle, damping, and stiffness of the damper will affect the mitigation system.
The system modal damping affected by the cable-stayed inclination is another problem need to pay particular attention.
Online since: January 2012
Authors: Li Sun, Guang Wei Qi, Zi Qin Ma, Xiu Lun Wang, Peng Lu
Process feature, referring to the technology information and structural properties, is an information collection of one process unit.
The action factors can be applied to other machines after modifying only a few of them.
Processing method affects the selection of spreaders, machines, fixtures and measuring directly.
The type of fixtures and machines are determined by production type, and the precision and work piece size are all the necessary factors for machine model and measuring species.
The analysis of action factors are displayed in table5.
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