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Online since: September 2007
Authors: Cai Fu Yang, Yong Quan Zhang, Chai Feng, Su Hang, Xu Zhou
The as-received base plate was previously austenized at 900°C for 120 minutes and quenched for microstructure refinement and aged at 650°C for 250 minutes for optimum toughness and desired mechanical properties combination development.
The composition of the steel and welding wire, and the mechanical properties of the steel are given in table 1 and 2, respectively.
Table 1 Composition of experimental steel and welding wire (wt %) C Si Mn P S Ni Cr Cu Mo Nb H Plate 0.060 0.17 0.53 0.010 0.016 0.85 0.73 1.31 0.22 0.022 / Wire 0.060 0.32 1.76 0.007 0.006 1.60 / / 0.50 / 0.0007 Table 2 Mechanical properties of experimental steel σs (MPa) σb (MPa) δ5 (%) Ψ (%) Charpy impact energy, Akv, -40°C (J) 615 620 685 680 23 24 79 80 255 Results and discussion Generation of welding delayed cracking is well known as a result of a combination of the following three factors: hardenability characteristic of the base metal, constrain level of the joint and diffusion hydrogen content of weld metal [5].
Diffusion hydrogen content, as one of the main factors affected the cold cracking depends on the environmental humidity.
Humidity refers to relative humidity (RH) and absolute humidity (AH), and it is absolute humidity that affected cold cracking in the course of welding.
Online since: June 2006
Authors: Dezső L. Beke, Lajos Daróczi, C. Hegedűs, V. Kökényesi
For the further improvement of the bonding properties the detailed knowledge of the microstructure of the metal-ceramic interlayer is essential.
The properties of the base metals play fundamental role in the formation of interfacial phases.
Especially the oxidation ability and the microstructure of the developed surface oxide layer during the manufacturing process are the most important factors.
The excess ceramics were removed by mechanical grinding until the thickness of the ceramic layer reached about 0.05 mm thickness.
The formed, coarse grained complex oxide can strongly affect the mechanical properties of the metal-ceramic bonds.
Online since: March 2007
Authors: Guido Borino, Boris Failla, Francesco Parrinello
Introduction Mechanical interfaces are commonly used devices capable to model mechanical discontinuity conditions.
These localized phenomena change the behavior of the entire system and eventually affect the ultimate structural failure mode.
Features of the microstructure might play a relevant role when small scale problems are analyzed, since they affect the way in which localized damage forms, grows and propagates.
Nonlocal elastic-damage interface Let us consider an interface layer in which all the mechanical properties are projected over a surface of zero thickness.
However, in the most common cases, because damage induces elastic heterogeneous properties (and also because of different elastic stiffness in traction and compression states) the first local term is effective also far form the boundaries and gives an important contribution for spatial transition regions.
Online since: December 2011
Authors: Xiu Juan Pei, Zhi Fa Wang, Rui Sheng Wang
The influences of matrix aggregates particle size grades on the properties of grouting materials for blast furnace lining crack repair were mainly discussed.
Cracks can also happen in the tap hole area due to the mechanical impacts of mud gun and driller.
The matrix aggregates particle size grades distribution is one of the key factors that affect the properties of grouting materials.
Thermal Properties Test Results and Analysis.
Table 6 Samples’ Apparent Properties with Different Matrix Aggregates Particle Sizes after Fired No.
Online since: March 2015
Authors: Davide Campanella, Livan Fratini, Gianluca Buffa, Marion Merklein
Linear Friction Welding, used to weld non-axisymmetric components and Accumulative Roll Bonding, used to increase the mechanical properties of sheet metals, were considered.
This microstructural change alters the mechanical properties.
The obtained joints are characterized by better mechanical properties than those obtained by fusion welding methods.
Accumulative Roll Bonding (ARB) [4], used to increase the mechanical properties sheet metals, was considered as forming process.
As ARB is considered, roll speed greatly affects the strain rate, while roll diameter and distance between the rolls greatly affect the strain (Table 1).
Online since: May 2012
Authors: Cristina Florea, Karla Berdich, Mircea Dreucean
Good topography information is a premise in nanoindentetion and in determining mechanical properties of materials.
AFM is a mechanical imaging instrument that measures the three dimensional topography as well as physical properties of a surface with a sharpened tip.
The final AFM image is obtained from the combined properties of between the geometric properties of the tip and the sample surface.
Despite the often nanoscale nature of the surface undulations, the topography of a surface is known to substantially affect the bulk properties of a material [8].
Nanoindentation is a very important method to determine the mechanical properties of different materials like roughness and Young modulus [9].
Online since: July 2007
Authors: Jung Woog Shin, Yong Taek Hyun, Seung Eon Kim, S.J. Heo
Introduction Scaffolds based on biodegradable materials combined with osteoinductive factors are promising for bone tissue engineering.
Composite materials, especially polymer/ceramics composites, have been paid much attention as a prospective scaffold material, due to the combination of adequate mechanical properties and biocompatibility[1,2].
However, biocompatibilities and mechanical properties of PCL/HA composite scaffolds have not been fully characterized yet with HA content, pore structure, etc.
In the present study, four kinds of scaffolds with different content of HA [0, 20, 40 and 60% (w/w)] were prepared to investigate the effect of HA on scaffolds properties.
Data indicate that the presence of HA does not affect porosity degree.
Online since: August 2021
Authors: Gulgena D. Shakirova, Lenar N. Shafigullin, Natalya V. Romanova
First of all, elastomer should be resistant to media in the range of medium temperatures, pressures, and other factors that affect a sealing device within the warranty storage and operation period [1-3].
Any change leads to a change in mechanical properties, which results in a sealing failure.
It can have a negative influence on the physical mechanical properties of O-rings.
In view of this fact, the critical task was to study the physical mechanical properties of O-rings after they were held in coolant vapor at a temperature of 110 °C for 72 hours (tables 5, 6).
It leads to a decrease of strength properties.
Online since: January 2012
Authors: De Gong Chang, Cong Feng An, S.M. Li
In this paper, the effect caused by other factors of output will not say more than needed, only the impact of indexing plate angular velocity and angular acceleration is analyzed.
In summary, the angular velocity mutation and angular acceleration of indexing plate rotary increase with the decrease of pitch radius, which will affect the good performance of the mechanism, increase the impact load of the mechanism, damage stability of the system, and affect the accuracy and efficiency of the mechanism, etc.
That means it will affect the positioning accuracy when setting a large rang of indexing plate.
The dynamic analysis of globular indexing cam mechanism [J], Mechanical transmission. 1999
[4]Zou Huijun, Yin Hongliang, The design and application of intermittent motion mechanism [M],Beijing: Mechanical industry press, 2008.10
Online since: September 2017
Authors: A.V. Vyboishchik, I.L. Kostiunina
The article presents an overview of the composition and physical properties of masonry paints used in Chelyabinsk Region.
The influence of additives on the basic properties of masonry paints, viz. weather resistance, viscosity, hardness, cost, is considered.
The properties of aluminosilicate binders are substantially influenced by modification process.
Wu, Success factors of enhanced disaster resilience in urban community, Natural Hazards, 74(2) 2014 661-686
Wilson, et al., Factors affecting the water retaining characteristics of lime and cement mortars in the freshly-mixed state, Materials and Structures, 44(2) 2011 509-516
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