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Online since: January 2009
Authors: Dave M. Gage, A.D.W. Thiel, R.H. Dauskardt, M.K. Haas, L.M. Matz, M.L. O'Neill, T.M. Wieder, G. Banerjee, M.B. Rao
during the polishing and cleaning process steps, resulting in a degradation of the electrical and mechanical properties [1-3].
The upper surface of the coupons was prenotched, and the mechanical properties were evaluated using the 4-pt bend (FPB) method [5] to determine adhesive fracture properties and double cantilever beam (DCB) method [6] to determine cohesive fracture properties.
The results show that polishing and cleaning with CP72B chemistry has negligible impact on the cohesive fracture energy, indicating that the dielectric film maintains its mechanical properties despite contact with the slurry under the mechanical stresses induced during polishing.
This suggests that other factors (besides particles) are playing a role in the interfacial adhesion, which requires further study.
Conclusions The effect of barrier slurry and cleaning on the mechanical properties of DEMS-based porous OSG (k=2.5)/SiCN and copper/SiCN films was determined.
Online since: March 2013
Authors: Tong Liu, Shu Bin Yi, Xue Cai Wang
This paper is about to make it clear that to what degree stratification affects the integrity of pressurizer surge line.
The geometry of surge line analyzed in this paper is shown as Fig.1, and the pipe material properties are given in Table.1.
Fig.1 Geometry of pressurizer surge line Tab.1 Material properties of surge line Property Value Material Type ASME SA-312 Type 316 Young Modulus 193 [GPa] Poisson Ratio 0.3 Density 8 000 [kg/m3] Specific heat 500 [J/(kg·K)] Conductivity 16.3 [W/(m·K)] Thermal expansion 1.7×10-5 [K-1] Finite element model.
The American Society of Mechanical Engineers.
American Society of Mechanical Engineers.
Online since: January 2018
Authors: Peter Olegovich Rusinov, Zhesfina Blednova
We demonstrated the functional-mechanical properties of the "steel-TiNiCo-B4C-Co" composition with preliminary thermomechanical treatment, which showed an increase in the durability of rotor-screw propellers with TiNiCo-B4C-Co surface composite layers.
The destruction of propellers is affected by a number of technological factors (pores, inclusions, residual stresses, etc.) and operational ones: (corrosion, fatigue, mechanical damage and other factors).
These alloys have unique strength and plastic properties.
Rusinov: Mechanical and Tribological Properties of the Composition “Steel-nanostructured Surface Layer of a Material with Shape Memory Effect Based TiNiCu”.
Stepanenko: Mechanical and tribological properties of “substrate-material” multifunctional composite with shape memory effect.
Online since: December 2011
Authors: Xiu Fang Zhu, Yu Jing Nie, Hong Xia Zhang, Ming Yang
The Synthesis and Feature rearch on the Thermosensitive Hydrogels(NIPA-co-AAm) Zhu Xiufang1, a, Yang Ming1, b, Zhang Hongxia1, c, Nie Yujing1, d 1Department of material engineering, Hubei University of automotive technology, China ashine_1113@163.com byang_min6@126.com cufoxhz@126.com dnieyujing@sina.com Keywords: Salinity, hydrogels, mechanical properties Abstract.
Tensile tests were conducted on a N-isopropylacrylamide(NIPA)-acrylamide(AAm) comonomer gel sensitive to variations in environmental temperature. and salinity Mechanical properties (Young’s modulus) were determined at different levels of swelling equilibrium.
Shifts in the mechanical properties were observed between samples tested in the swollen and unswollen states.
The mechanical tensile testing machine equipped with a 18 N load cell, was used for measuring the mechanical properties of the hydrogel.
As shown in the Fig. 6, putting the dry hydrogel disc in the ionic strength solution, we can see that 100min later, the hydrogel reach their equilibrium, and the ionic strength value is the key factor which affect the hydrogel swelling ratio, swelling ratio of hydrogel immersed in the 0M ionic strength is the highest, and the one immersed in the 0.2M ionic strength is larger than in the 1.0M ionic strength.
Online since: July 2019
Authors: Xing Hui Li
The material selection must not only have good comprehensive mechanical properties, but also have good weldability, machinability, and so on.
The chemical composition is shown in Table 1, and the mechanical properties are shown in Table 2.
Crack resistance and mechanical properties.
Solderability Test and Results Welding Test Piece Ggrouping and Numbering.In order to compare the mechanical properties of WELDOX1100 high strength steel welded joints with different preheat temperatures.
Structure and Properties.21 (2004) 132-136
Online since: July 2014
Authors: Wen Bai Yu, Jun Peng, Dong Xiu Zhang
The testing shows that the pre-stress not only improves comprehensively the load-carrying properties of composite wall, but its fracture mechanism and mechanical model are the same as that of the non-pre-stressed composite wall, so that the same design approach can be used.
Introduction The aims of this test are: to explore the pre-stress’s influences on the emergence and development of cracks and their fracture morphology and deformational characteristics under the eccentric load of composite wall’s out-of-plane, by the static test of the four walls that consist of two different pre-stressed composite brick wall models of two-layer vertical pre-stress; to analyze of the influence factors of bearing capacity; to verify the methods of calculating proposed by relevant institutes [5].
All this can effectively prove the advantage of prestress. 4.2 Analyses of factors and laws that affect the eccentric compression performance of composite wall’s out of plane In addition to the several influencing factors proposed in literature [4] [5], the analysis of Table 3 shows that prestress is also an important factor.
In short, the destruction mechanism and mechanical model of composite frame are identical to that of non-prestressed composite wall, see details in literature [4].
    (3) The stiffness of loaded beam, strength of material, structural column’s spacing, columns and ring beam’s cross-section, reinforcement, the upper structure and downstream load and the size of the openings etc. are equally the factors influencing the mechanical behavior of prestressed composite wall, and have the same influence pattern
Online since: December 2014
Authors: Zhong De Shan, Wan Hua Cai, Bai Liang Zhuang, Yong Sheng Ye
Introduction Safety and weight have become increasingly important factors affecting consumer choice in automobile markets.
Most studies have focused on the mechanical properties of the formed part, numerical simulations, and the design of mold-cooling systems.
The forming process of hot-stamped parts and the optimization of thereof has also been described[10–12], and the thermodynamic properties of the workpiece during hot stamping has been analyzed along with the characteristics of the formed part[13–15].
During hot stamping, the primary factors affecting the forming force are the initial forming temperature, forming speed, heat transfer coefficients of the mold and sheet metal, part shape, and thickness of the sheet-metal workpiece.
During hot stamping, the temperature of the workpiece should be as uniform as possible to achieve uniform mechanical properties of the workpiece as it deforms.
Online since: May 2020
Authors: Elia Mercedes Alonso Guzmán, Hugo Luis Chávez-García, Wilfrido Martínez Molina, Mauricio Arreola Sánchez, Luis Colín Velázquez, Maybelin Carolina García Chiquito
Nowadays, one of the biggest problems is the environmental contamination, which is attributed to a great variety of factors, among which is the construction, because one of the main synthetic materials most used is concrete, artificial material consisting of portland cement, fine aggregates, coarse aggregates and water, in the production and processing of portland cement a large amount of carbon dioxide (CO2) is generated, by 2018 approximately 8% of CO2 emissions from the world is attributed to the cement industry.
Additions of 2% are made with respect to the weight of the cement of organic additions, which do not affect the behavior of the mortar.
Currently there is a wide variety of research on additions to cement, which seek to improve their physical, mechanical and durability, able to withstand aggressive attacks of nature, with low permeability, high adhesion and mechanical resistance [1].
It seeks to improve the physical, mechanical and durability properties of the mortar [6].
These are tests where the sample is physically and mechanically altered to know its properties and thus determine its quality.
Online since: May 2011
Authors: Fei Wang, Xu Li Liang, Hua Ming Wang
Secondly, test the cohesiveness properties.
The method to text the cohesiveness properties is that,gentlely stick the side of the concrete slump cone already collapsed with vibrating rod,if the cone slides away slowly, then the cohesiveness properties is good;cone collapse, or if there is a segregation phenomenon, the cohesiveness properties is poor.
Slump is the directly expression for the flow properties.
Concrete with good flow properties can be vibrated and operated easily,could’t result in the cellular, pockmarked face of shaft lining .
Affected by the environmental factors in site, the solutions to the problem of slump loss are in mainly three aspects.
Online since: September 2014
Authors: Janusz Majta, Marcin Kwiecień, Paulina Lisiecka-Graca, Monika Stefanska-Kadziela, Dominik Dziedzic, Krzysztof Muszka
In microalloyed steels, especially in multiphase steels, the mechanical properties are adjusted by combination of microstructure components with different levels of theirs mechanical responses, including hardness and ductility.
The results of experimental studies are integrated with computer modelling and dislocation theory to provide insight into the unprecedented combination of properties achieved in certain multiphase steels such as ultra-high flow strengths, good ductility and workability.
This leads to gradient in both deformation and microstructure what in turns makes the prediction of the microstructure evolution and properties across the plate volume difficult.
Modelling As it was already mentioned the key factor for computer modelling process is selection of an appropriate rheological model.
In the case of microalloyed steels, the presence of the precipitation and solid solution strengthening mechanisms significantly affects the hardening process, mostly due to the retardation of dislocation substructure formation process.
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