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Online since: September 2008
Authors: Linda Stappers, Jan Fransaer, Annelies Malfliet
These composite coatings have useful thermo-mechanical properties for thermal actuators.
The properties of the metal-PCM composite coatings were examined by differential scanning calorimetry (DSC) and vertical dilatometry.
Other interesting properties of paraffin are its negligible undercooling, the absence of phase segregation and the fact that it is chemically inert.
The thermal and thermo-mechanical properties of the PCM-metal composite coatings were examined by differential scanning calorimetry and thermal dilatometry.
Since the matrix contains a plastic and elastic part and the particle contains a solid and a liquid component, the thermal and mechanical properties were homogenized by weighed averages.
Online since: September 2013
Authors: Raoul Plettke, Peter Vatter
The effect of this factor has not been identified among the influences of other disturbance factors so far.
As an additional aspect, the tube dimensions affect the material characterization which leads to inaccurate material properties in numerical simulations.
In this contribution the scatter of some geometrical tubes properties and its impact on the 3-roll-push-bending process is investigated.
The characterization of the mechanical properties of tubes is done by tensile tests.
Thereby, the scatter of the mechanical material properties can be determined.
Online since: October 2014
Authors: Michal Kraus, Darja Kubečková
The main factor was the thickness of the thermal insulation.
Calcium silicate masonry has high heat accumulation and excellent acoustic properties.
The correct thermal insulation must fulfill the following criteria: good thermal insulation properties, long-term durability, dimensional stability, low thermal expansion, vapor transmission, acoustical and mechanical properties, fire resistance, applicability and economic and environmental demands.
Grey polystyrene has better thermal properties about approximately 20 %.
Fiberboard increase rigidity and improve the thermal properties of the construction.
Online since: December 2025
Authors: Tomas Knapek
Due to the inhomogeneous structure of composites and the different physical and mechanical properties of the matrix and reinforcement, specific problems arise during machining, such as delamination, intensive tool wear, increased temperature in the cutting area, or poor surface finish.
Delamination is usually assessed via the delamination factor (ratio of maximum damaged diameter to nominal), or via area/fractographic analysis.
The basic properties of the material are listed in Table 1.
The amount of wear depends on the cutting speed, but a change in the back angle also affects the amount of wear.
Conclusion The results of the experimental measurements clearly show that the main factors influencing the quality of CFRP material drilling are the cutting speed and tool geometry, specifically the rake angle.
Online since: January 2010
Authors: L. Pentti Karjalainen, Timo J. Juuti, Raimo Ruoppa, Tero Taulavuori
The parameters affecting the kinetics and degree of the reaction were investigated.
Results Mechanical properties.
Discussion The effect of SSA on mechanical properties.
The amount of preceding deformation and the induced α'-martensite are key factors for the outcome of the ageing process.
Suzuki: Dislocations and Mechanical properties of Crystals, (John Wily & Sons, Lake Placid, USA, 1957) [11] J.
Online since: January 2012
Authors: Xue Hua Meng, Qing Li, Zu Quan Jin, Ji Xiu Zhang
So far, There is a lack of more systematic research on factors affecting the rate of expansion of gypsum solidification.
The gypsum retarder of which the effect[2,3] , influencing factors[4,5]and retarding mechanism[6,7] had also been extensively studied.
Using the GB/T 17669.3-1999 standard of mechanical properties of gypsum plaster to test the flexural strength.
Acknowledgements This work was financially supported by the National Science and Technology Support Program(2011BAE14B05) References [1] DAIYANLIANG,ZHENGJIANHE,LISUQING,WANGHONGLIANG Study on performance parameters affecting expansion of plaster mold—Problem of gypsum expansion (一) National Building Technology Journal—《Ceramics》,2004,167(1):22 [2] LEIMEN G.
Influence of inorganic retarder on building gypsum property [J].
Online since: December 2014
Authors: Xiao Xue Zhang, Bin Sheng Wang, Zhi Qiang Lv
There are many factors that impact on slope stability, such as soil property, water content, slope shape, external load, etc. the particle flow method is one of discrete element method that is suitable to analyze the particle media, and mainly used to simulate the interactions between the particles round, which it is assumed that each unit is rigid and geometric forms is spherical or disc-shaped. the paper used the particle flow method, made a numerical simulation analysis on the slope under load.
Fig.2.The biaxial compression test model Fig.3.PFC2D model of slope Table 1 Slope model input parameters contact strength/kN friction factor particle normal contact stiffness /MPa particle stiffness ratio contact strength deviation initial locking stress /kPa 100 0.4 20 1.5 0.2 100 200 0.4 20 1.5 0.2 100 The adopted model(see Fig.3)which parameters accord with the data in Table 1 was generated by the way of expanding particle diameter[4] .
Damaged form with a slope loaded area 2A When a large load area affected, at T = 30000 while under the load, the role of particle movement occurred, but no significant changes in the slope, only a little shot in the toe drop.
Conclusion The load area affected the force transmission mode of the slope, so that the various stages of destruction varies directly, and affect the timing and extent of the disaster.
Analysis of relationship between particle mesoscopic and macroscopic mechanical parameters of cohesive materials [J].
Online since: June 2012
Authors: Shuang Bao Zhang, Ming Zhi Feng, Rui Long Zhao, Na Lv
In this paper, we have engaged in the preliminary study on the production process and physical-mechanical properties of structural-building bamboo plywood, looking forward to provide a reference value and theoretical basis for its application in the construction field.
In order to prevent hot pressing thickness rebound after inflation, which affect the quality and machining efficiency sheet, the designed bamboo curtain's soak glue content is 7% ~ 8%, using the way of natural dry.
Results and Discussions In the same condition of MC and RC ,we can take orthogonal experiment with three factors and three levels of the pressing time, pressing temperature and sheet density ,and consider that the impact of the hot pressing process on the performance of bamboo plywood.
Conclusions (1) It can be seen that under different process conditions, the mechanical properties of bamboo plywood is substantially meet the “JG-T3026-1995 bamboo plywood templates”, more than the OSB/4 plate performance requirements and EN300-2006 requirements from the experimental results.
References [1] Zehui Jiang, Liang Chang, Zheng Wang: Physical and Mechanical Properties of Glued Structural Laminated Bamboo (CHINA WOOD INDUSTRY, China 2005) [2] Jian Han: Study on Relationship between Water Content of Thin Bamboo strips and Plybamboo Production Process (CHINA WOOD INDUSTRY, China 1998) [3] Jinming Chen.
Online since: February 2020
Authors: Marimuthu K. Prakash, Kumar C.S. Chethan, Prasada H.P. Thirtha
Three factors with three levels was considered for the designing the set of experiments.
The different factors, their levels, and the experimental design are shown in Table 1. and Table 2.
Factors and their respective levels Factors Level I Level II Level III Speed, rpm 355 500 710 Feed, mm/min 20 40 80 Depth of cut, mm 0.2 0.3 0.5 Table 2.
The work piece was modelled as a deformable body and was assigned with the properties of AISI 1045 steel material, a milling cutter (4-flute end mill) was chosen to be the tool.
Force variation for the end milling operation on AISI 1045 steel Discussion By doing a regression analysis on the experimental data, it was found that the factors considered in the design actually affect the output parameter, which is residual stresses.
Online since: January 2011
Authors: Tao Ge, Yong Kang Zhang, Xiao Meng Chu
Introduction Compared with conventional material Carbon Fiber composites(CFCs) have outstanding properties : low density, high strength, good corrosion resistance etc. therefore CFCs are wildly used in fields of aeronautics, aeronautics, astronautics and military.
Many factors influence the quality of cutting: cutting speed, cutting environment(including temperature, humidity, etc.), assistant gas(including gas type, gas pressure, etc.), laser parameters( laser energy, pulse width, pulse frequency, laser modulus, laser Power distribution, spot diameter, defocused amount, etc.).
HAZ (heat affected zone) indicates the effect of material surface by laser beam radiating.
Laser cutting is a thermal effect of laser on material, so heat affected zone is a very important evaluation index of cutting quality.
If the laser energy is too high, cutting section surface will be carbonation seriously, so section material properties and degree of finish will decrease.
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