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Online since: September 2007
Authors: Zi Yang Xiu, De Zhi Zhu, Gaohui Wu
The microstructure observation showed that the composites were dense and Si particles distributed uniformly, The interfaces and the existance of the interface reaction were the important factors which affected the properties of the composites; The linear CTEs of Sip/4032Al composites was between (8.1~12) ×10-6°C-1, and they were decreased with the increasing content of Si particles as well as annealing treatment.
The composites had excellent mechanical properties and also could be recycled.
Three composites with pure Si particles as reinforcements and 4032Al alloy as matrix were produced, and also study the thermal-physical properties.
The interfaces and the existence of the interface reaction are the important factors affecting the properties of the composites.
Mechanical property.
Online since: February 2014
Authors: In Kyu Kwon
A Study on Comparison of Mechanical, Thermal Properties of High Strength Structural Steels at High Temperature In-Kyu Kwon Department of Fire Protection Engineering, Kangwon National University, Korea kwonik@kangwon.ac.kr Keywords: Mechanical and Thermal properties at high temperature; High strength structural steels; SM 520; SM 570; Eurocode 3 Abstract.
In order to compare the fire resistance performance of high strength structural steels at high temperature, databases such as mechanical and thermal properties at elevated temperature were compared with those of Eurocode 3.
Experiment for mechanical and thermal properties of high strength structural steel at high temperature Mechanical properties such as yield strength, elastic modulus and thermal properties such as linear expansion coefficient at high temperature are fundamental factors when evaluating the fire resistance performance by using the advanced fire engineering method.
The comparison results showed that the thermal properties from Korea were lower and the mechanical propertes as a whole are similar.
Shin, Evaluation of Fire Resistance Using Mechanical Properties at High Temperature for Steel Column Made of Rolled Steels (SS 400), Korean Journal of Metal Materials, 2011, Vol. 49, No. 9, pp. 671~677
Online since: January 2023
Authors: Faizah Ali, Sugiarto Putra Wijaya, Eka Nurul Falah, Iyando Aditiyawan, Rindang Fajarin, Widyastuti Widyastuti
During compaction process, the applied load and dwelling time are considered as substantial factor which affect the final product.
In addition to compaction pressure, dwelling time also affects the mechanical properties of the product.
Compression and Hardness Properties.
This results in the appearance of cracks in the composite which can reduce the mechanical properties [13].
Conclusions In this study, the compaction pressure and dwelling time in the compacting process greatly affect the mechanical properties of Cu-Sn composites.
Online since: August 2013
Authors: Dan Zhou, Yan Wang, Guang Fu Liu, Lei Zhang
Method for Mapping from Thermal Comfort Requirements to Energy Design Factors of Air-conditioning Yan Wang 1, a, Guangfu Liu 1, b, Lei Zhang 1, c and Dan Zhou 1, d 1 School of Mechanical & Automotive Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China ahaorang730@163.com, bgfliu@hfut.edu.cn, cleonchao@163.com, dzhoudan80@126.com Keywords: Thermal comfort requirement, Energy design factor, House of quality, Fuzzy mathematics Abstract.
In order to satisfy human thermal comfort requirements (TCRS), meanwhile, optimize air-conditioning energy property in use stage as design objective, a model of mapping from TCRS to energy design factors (EDFs) of air-conditioning based on house of quality was presented.
However, for domestic air-condition, there is little research that involving air-conditioning itself performance and the design factors which influence thermal comfort.
The model of mapping from thermal comfort requirements to EDFs Energy Design Factors.
The influence factors of human thermal comfort conclude air temperature, air humidity, air velocity, mean radiant temperature as well as human clothing and activity.
Online since: October 2012
Authors: Hai Jun Zhou, De Ju Liu, Yan Tao Li, Hao Chen
The result shows that the PU of PNA and PHA revealed better damping properties. 3.3 Mechanical properties Table 3 Mechanical properties of PUs with different polyester structure polyester Shore A hardness Tensile strength /MPa Tear strength /kN·m-1 Elongation of break /% PBA 89 45.5 79.8 497 PEPA 84 44.8 78.9 584 PNA 71 24.8 32.3 595 PHA 82 8.8 35.2 577 The mechanical properties of the PUs are shown in Table 3.
It can be seen that the mechanical properties became lower with increase in polyester except the elongation of break.
For this reason, the mechanical properties of PU for PNA and PHA are lower than those of PU for PBA and PEPA.
These results suggest that phase separation exists on the surfaces of PHA. 4 Summary (1) The damping properties of PUs are affected by the methyl of polyester.
(2) The mechanical properties PUs would be decreased with increase in methyl of polyester except the elongation of break
Online since: January 2017
Authors: Milena Kušnerová, Marta Harničárová, Dušan Mitaľ, Ivan Kopal, Vojtěch Václavík, Jan Valíček, Zuzana Mitaľová
The moisture percent of these products also influences their properties, such as dimensional stability, mechanical properties, resistance to decay and etc., while the wood hydroxyl content affects their water absorption [5, 6].
Physical-mechanical properties.
Values of mechanical properties after uniaxial tension test.
Values of mechanical properties after three-point bending test.
A non-monotonic nature of the above-described functional dependencies of some mechanical properties of the WPC may be related precisely to the inhomogeneity of the material which is an important factor affecting the quality of its surface both before and after the machining process or the value of the surface roughness parameters Rz and Ra at various places on the surface of the tested WPC sample.
Online since: October 2011
Authors: Yuan Yue Huang, Qin Xu, Yue Zhang
The hydraulic impactor is the key component that affects the hydraulic impact mechanical properties.
Impact energy or impact power parameter is the important indication of impact system performance, which reflects the advantages and disadvantages of the impact mechanical properties.
There are three factors affecting the basic function parameters: hydraulic conditional parameters, working object and using conditions.
The factors such as the fast reversion of the valve would be affected at any time.
Conclusions Many parameters and factors all affect the impact performance of the hydraulic impactor.
Online since: March 2009
Authors: G. Rodríguez-Castro, D. Meléndez-Morales, Jesus Vargas-Hernández, U. Figueroa-López, José Martínez-Trinidad, Ivan Campos-Silva
Effect of Boriding on the Mechanical Properties of AISI 1045 Steel G.
Some mechanical properties of AISI 1045 borided steels were estimated in the present work.
Due to essential difference between mechanical and physical properties of coating and substrate, different methods are applied to study the effect of boriding on ferrous and non-ferrous alloys [4].
The mechanical tests were performed using cantilever type-rotary bending testing machine (RBF 200) under a frequency of 66 Hz, considering a stress concentration factor (Kt) of 2.53.
Conclusions The effect of boriding on the mechanical properties at the surface of AISI 1045 steels was evaluated in this work.
Online since: October 2010
Authors: A.S. Aloy, A.V. Strelnikov
Study of New Filters Properties for Cs-137 Vapour Capture at High Temperature A.S.
Thermal treatment at 1400-15000С made it possible to increase mechanical strength of the filter based on porous chamotte factors of 1,5- 3,4, without any significant changes of other characteristics that exceeded similar parameters for the filter based on fly ash microspheres.
Fig. 2 shows how the thermal treatment affects the mechanical strength of the porous chamotte (measurement according to RF GOST №8462-85) and how the thermal treatment affects its specific surface (mercury porometry method).
–Thermal treatment of the porous chamotte at 1350-1500оС (in comparison with the original chamotte) results in the following: · increase of the compression strength by factors of 1,5 – 3,4; · decrease of the open porosity by factors of only 2,7 – 10,4 vol. %; · increase of the apparent density by 30 rel. % (from 0,40 to 0,52 g/cm3); · decrease of the specific area by 26 rel. % (from 101,0 to 74,2 m2/g) – Thermal treatment of the porous chamotte at 1550 – 1600оС (in comparison with the original chamotte results in the following: · increase of the compression strength by factors of 10-16, but causes irregular shrinking and cracking; · decrease of the open porosity by 19,3 – 52,7 vol. %; · increase of the apparent density by factors of 2,3 – 4,1; · decrease of the specific area by factors of 2,1 – 4,3.
The PCh thermal treatment improved its mechanical strength by factors of 1,5 – 3,4, without a significant degrading of the above-mentioned characteristics.
Online since: November 2007
Authors: Yasuo Yamada, Cui E Wen, Takumi Banno, Yun Cang Li
Mechanical Properties of Micro-Porous Metals Produced by Space-Holding Sintering T.
The mechanical properties were studied using compressive tests.
The mechanical properties of porous metals have been extensively investigated [7-13].
However, there are other factors such as pore size, geometry, etc that affect the mechanical properties.
The characteristics of the porous nickel specimens were studied by scanning electron microscopy (SEM) and the mechanical properties were investigated by compressive tests.
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