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First Evaluation of the Structural Performance of Traditional Brickwork after Standard Fire Exposure
Online since: July 2015
Authors: Francesca Sciarretta
There are reasons for coupling investigations on the residual mechanical properties to fire resistance data, aiming at a more complete knowledge of the behavior of a masonry member during and after fire exposure.
Generally, the maximum temperature of exposure is the main factor that affects the residual mechanical properties of concretes and masonry materials (aside from the parameters that are peculiar to the material); secondly, the duration of exposure, the heating rate and the cooling regime [23] are of relevance.
The decay of a generic mechanical property Χ after fire exposure, i.e. the ratio Χres/Χ = kq between the decayed and the original property, could be expressed as a function of the maximum exposure temperature q, provided that the other relevant factors (heating rate, duration at maximum temperature and cooling regime) stay unvaried.
This numerical research proposes factors of original properties < 1 (listed in Table 3) that can be of reference for correlation between fire endurance and residual load capacity; in fact, such factors express the mechanical decay in post-fire condition in the worst case, i.e. after the wall has exceeded its prescribed fire resistance limit.
Sciarretta: Masonry exposed to high temperatures: mechanical behaviour and properties - an overview, Fire Saf.
Generally, the maximum temperature of exposure is the main factor that affects the residual mechanical properties of concretes and masonry materials (aside from the parameters that are peculiar to the material); secondly, the duration of exposure, the heating rate and the cooling regime [23] are of relevance.
The decay of a generic mechanical property Χ after fire exposure, i.e. the ratio Χres/Χ = kq between the decayed and the original property, could be expressed as a function of the maximum exposure temperature q, provided that the other relevant factors (heating rate, duration at maximum temperature and cooling regime) stay unvaried.
This numerical research proposes factors of original properties < 1 (listed in Table 3) that can be of reference for correlation between fire endurance and residual load capacity; in fact, such factors express the mechanical decay in post-fire condition in the worst case, i.e. after the wall has exceeded its prescribed fire resistance limit.
Sciarretta: Masonry exposed to high temperatures: mechanical behaviour and properties - an overview, Fire Saf.
Online since: November 2013
Authors: Hai Peng Qiu, Jian Jiao, Xiu Qian Li
Pore Structure and Mechanical Properties of ZrC/SiC Multi-Components Modified C/C Composites
Xiuqian Li, Haipeng Qiu and Jian Jiao
AVIC Composite Co., Ltd., Beijing 101300, China
Key words: ZrC/SiC multi-components modified C/C, pore structure, microstructure, mechanical properties.
Effect of sample’s porosity on the mechanical properties.
The pressure of these deficiencies plays an important role in the mechanical properties.Table 3 shows the flexural properties of samples with different porosity .
Besides, the matrix composition is another important factor affecting the mechanical properties of samples.
The higher content of SiC can enhance the mechanical properties under the condition of similar porosity.
Effect of sample’s porosity on the mechanical properties.
The pressure of these deficiencies plays an important role in the mechanical properties.Table 3 shows the flexural properties of samples with different porosity .
Besides, the matrix composition is another important factor affecting the mechanical properties of samples.
The higher content of SiC can enhance the mechanical properties under the condition of similar porosity.
Online since: March 2013
Authors: Li Li Zhao, Lv Ming Yang, Tie Tao Zhou
The quantitative relationship between mechanical properties and microstructure was studied by statistical methods.
The results indicate that pouring temperature is the main element to affect the mechanical properties of permanent mold casting A356 and the optimum pouring process parameter is about 744 ℃ .Mechanical properties have a liner relationship with secondary dendrite arm spacing in a certain extent.
Results and discussion Mechanical properties of tensile samples.
The technology research of A356 alloy on mechanical properties.
Effect of pre/post T6 heat treatment on the mechanical properties of laser welded SSM cast A356 alloy [J].
The results indicate that pouring temperature is the main element to affect the mechanical properties of permanent mold casting A356 and the optimum pouring process parameter is about 744 ℃ .Mechanical properties have a liner relationship with secondary dendrite arm spacing in a certain extent.
Results and discussion Mechanical properties of tensile samples.
The technology research of A356 alloy on mechanical properties.
Effect of pre/post T6 heat treatment on the mechanical properties of laser welded SSM cast A356 alloy [J].
Online since: August 2014
Authors: Ming Der Jean, Shuang Hchuan Chen, Chyuan Du Liu, Shu Chuan Su, Shuen Chou Chen, Wen Tung Wu, San Jen Lee
Eight control factors based on L18 arrays were conducted and the wear-resistant properties of coatings were evaluated in the experiments.
Due to its feasibility and better mechanical properties, plasma-sprayed coatings are a popular and efficient method of forming thermal barrier coatings.
Much work has been carried out on mechanical properties of plasma sprayed coatings, including structures, bonding strength, as well as heat and wear resistance.
The Effects of Affecting Factors.
The most important factors identified by the S/N ratios and variance analysis affecting the process robustness are the factors such as travel speed, spray stand-off distance, powder feeder rate, and primary gas for the wear volume losses, respectively.
Due to its feasibility and better mechanical properties, plasma-sprayed coatings are a popular and efficient method of forming thermal barrier coatings.
Much work has been carried out on mechanical properties of plasma sprayed coatings, including structures, bonding strength, as well as heat and wear resistance.
The Effects of Affecting Factors.
The most important factors identified by the S/N ratios and variance analysis affecting the process robustness are the factors such as travel speed, spray stand-off distance, powder feeder rate, and primary gas for the wear volume losses, respectively.
Online since: June 2021
Authors: Rossen Radev, Nikolay Ferdinandov, Mariana Ilieva, Danail Gospodinov
As the welded constructions have specific requirements, the development of high strength and ultra-high strength steels imposes the need for research on the factors influencing their weldability.
The chemical composition and the mechanical properties of S700MC, according to manufacturer, are represented in Table 1.
Therefore, reduction in mechanical properties could be expected it this zone; this will be a subject of future researches.
Szataniak, The structure and mechanical properties of Domex 700MC steel, Communications, No. 4, 2013, pp. 54-57
Microstructure and mechanical properties of low power pulsed Nd:YAG laser welded S700MC steel.
The chemical composition and the mechanical properties of S700MC, according to manufacturer, are represented in Table 1.
Therefore, reduction in mechanical properties could be expected it this zone; this will be a subject of future researches.
Szataniak, The structure and mechanical properties of Domex 700MC steel, Communications, No. 4, 2013, pp. 54-57
Microstructure and mechanical properties of low power pulsed Nd:YAG laser welded S700MC steel.
Online since: June 2013
Authors: Gao Feng Quan, Rui Chun Li, Chun Yuan Shi, Ying Bo Zhang, Xi'an Xie, Jian Gang Lv
Extrusion molding performance of the profiles, the law of microstructure and mechanical properties were studied when billets pretreatment and extrusion temperature were changed.
Introduction Currently, one of the key factors that limit the application of magnesium alloy on the railway-train is lack of large-size wide and hollow magnesium profiles.
When the angle is found to be 0o or 90o, basal plane slip system orientation that is the size of Sch-mid factors and tensile twinning is the main factor to affect mechanical properties[3,4,5].
The mechanical properties of different parts of wide and hollow AZ31 magnesium alloy profiles are non-uniformity.
The mechanical properties of the same part of the profiles are anisotropy obviously.
Introduction Currently, one of the key factors that limit the application of magnesium alloy on the railway-train is lack of large-size wide and hollow magnesium profiles.
When the angle is found to be 0o or 90o, basal plane slip system orientation that is the size of Sch-mid factors and tensile twinning is the main factor to affect mechanical properties[3,4,5].
The mechanical properties of different parts of wide and hollow AZ31 magnesium alloy profiles are non-uniformity.
The mechanical properties of the same part of the profiles are anisotropy obviously.
Online since: July 2006
Authors: M.Q. Yu, Lian Meng Zhang, Qiang Shen, T. Li, Mei Juan Li
The improvement of mechanical properties of AlN/BN
composite ceramics is due to the fine and homogenous microstructure developed in the SPS
process.
Hardness, thermal conductivity and mechanical property.
It could be assumed that sintering method as well as characteristics of h-BN was the significant factor affecting the microstructure and properties of AlN/BN composite.
Compared with the samples sintered by conventional sintering processes, AlN/BN samples sintered by SPS exhibit better mechanical properties.
The improvement of mechanical properties of AlN/BN composite ceramics is due to the fine and homogenous microstructure developed in the SPS process.
Hardness, thermal conductivity and mechanical property.
It could be assumed that sintering method as well as characteristics of h-BN was the significant factor affecting the microstructure and properties of AlN/BN composite.
Compared with the samples sintered by conventional sintering processes, AlN/BN samples sintered by SPS exhibit better mechanical properties.
The improvement of mechanical properties of AlN/BN composite ceramics is due to the fine and homogenous microstructure developed in the SPS process.
Online since: December 2009
Authors: Hassan Farhangi, A.M. Shariatpanahi
Microstructure and Mechanical Properties of Dissimilar Ferritic and
Austenitic Steel Joints with an Intermediate Inconel-182 Buttering Layer
A.M.
Mechanical tests show that the average hardness, tensile ductility and impact energy of the weld metal were enhanced with increasing width of the buttering, while tensile strength properties were unaffected.
Residual stresses, brittle phase formation, dilution and carbon migration from the HAZ region on the ferritic steel joint are among the factors which weaken the HAZ region [1,3,4].
Tensile properties.
The results show that the Inconel-182 buttering layer employed in the dissimilar weld joints enhances the final elongation of the weld metal without affecting its yield and tensile strength.
Mechanical tests show that the average hardness, tensile ductility and impact energy of the weld metal were enhanced with increasing width of the buttering, while tensile strength properties were unaffected.
Residual stresses, brittle phase formation, dilution and carbon migration from the HAZ region on the ferritic steel joint are among the factors which weaken the HAZ region [1,3,4].
Tensile properties.
The results show that the Inconel-182 buttering layer employed in the dissimilar weld joints enhances the final elongation of the weld metal without affecting its yield and tensile strength.
Online since: September 2013
Authors: Ju Wei Wang
Since no antibacterial properties of bacterial cellulose alone as a packaging material, there is a non-antibacterial properties of defects.
From product performance point of view, the current foreign biodegradable antibacterial plastic mechanical properties and biodegradation properties and antibacterial performance, these plastics are biodegradable antibacterial play an important role.
Test methods Orthogonal Design.The inhibitory effect of biodegradable cellulose packaging material mechanical properties of many factors, the experimental analysis of the information obtained, directly affect the test results, there are three underlying causes can be made of polystyrene dosage, microcrystalline cellulose usage and the amount of titanium dioxide.
In the case of normal temperature and pressure molding time was 12h, emphasis on the amount can be made of polystyrene, microcrystalline cellulose, and the amount of toluene and acetone delivery compared to the physical and mechanical properties of materials, so the experimental design three factors, three levels L9 (33) orthogonal test table.
Antibacterial properties also reflect the best.
From product performance point of view, the current foreign biodegradable antibacterial plastic mechanical properties and biodegradation properties and antibacterial performance, these plastics are biodegradable antibacterial play an important role.
Test methods Orthogonal Design.The inhibitory effect of biodegradable cellulose packaging material mechanical properties of many factors, the experimental analysis of the information obtained, directly affect the test results, there are three underlying causes can be made of polystyrene dosage, microcrystalline cellulose usage and the amount of titanium dioxide.
In the case of normal temperature and pressure molding time was 12h, emphasis on the amount can be made of polystyrene, microcrystalline cellulose, and the amount of toluene and acetone delivery compared to the physical and mechanical properties of materials, so the experimental design three factors, three levels L9 (33) orthogonal test table.
Antibacterial properties also reflect the best.
Online since: August 2015
Authors: A.K. Lakshminarayanan, A. Shanmugasundaram, V.E. Annamalai
Henni et al., [6] correlated the microstructural changes with the variation in tensile properties of friction stir welded AZ91D magnesium alloy and reported that FSW caused a heterogeneous deformation that affected the microstructural and mechanical properties.
Hence the present investigation is aimed at to evaluate and compare the microstructural features and mechanical properties of gas tungsten and friction stir welded AZ91D magnesium alloy.
Tensile Properties.
Tensile properties of FSW and GTAW joints are presented in Table 1.
Kohn, Mechanical properties and microstructure of gas tungsten arc welded magnesium AZ91D plates, Materials Science and Engineering A. 302 (2001) 68–73
Hence the present investigation is aimed at to evaluate and compare the microstructural features and mechanical properties of gas tungsten and friction stir welded AZ91D magnesium alloy.
Tensile Properties.
Tensile properties of FSW and GTAW joints are presented in Table 1.
Kohn, Mechanical properties and microstructure of gas tungsten arc welded magnesium AZ91D plates, Materials Science and Engineering A. 302 (2001) 68–73