Search results

Cure and mechanical properties of natural rubber filled bacterial cellulose Chaiwute Vudjung Laboratory of Advanced Polymer and Rubber Materials (LAPRM) Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190 Thailand Email: chaiwute2110@gmail.com, scchaivu@ubu.ac.th Keywords: Natural rubber, Bacterial cellulose, Cure properties, Mechanical Properties Abstract.
Introduction Rubbers can’t be used in pure form due to their low mechanical properties.
The objective of this work was to study the cure and mechanical properties of NR filled BC with various amounts of BC.
Their cure and mechanical properties were characterized by Oscillating Disk Rheometer (ODR) and mechanical tests.
The effect of BC loading on mechanical properties of vulcanizates The influence of BC content on the mechanical properties of vulcanized natural rubber was investigated.

Fig.1 Specimen Fig.2 Mold Fig.3 Electronic Balance Thickness and Density of the Coating Measurement Thickness of the coating is assurance for internal quality of the coating, it directly affects the corrosion properties, stress and service life.
Hardness and elastic modulus of the material are most commonly used performance indicators in the mechanical properties.
Micron indenter test is an advanced technology to measure the mechanical properties of the materials surface, it uses micro-micron sharp indenter pressed into the coating surface, and real-time record the curve of pressure head relationship between stress and pressure deep, the mechanical properties of the material can be measured through this curve.
The method of determining contact stiffness approach is based on the slope of unloading curve, it can only get the maximum indentation at the mechanical properties.
There is plastic deformation during the measurement process, plastic deformation process corresponds to dislocation slip, micro-crack growth, and the local stress under great pressure head, these factors have impacts on the measurement results.

Detection of mechanical properties enables the assessment of possible replacement of commercial manufacture with the DMLS manufacture.
On the basis of the ASTM F1717 standards providing the essentials for the comparison of mechanical properties of spinal systems, twenty mechanical compression tests were carried out.
Mechanical properties of both bilateral systems in compression are comparable.
K. ; Ebraheim, N.A; Biyani, A; Rengachary,S; Faizan,A (2005): Role of mechanical factors in the evaluation of pedicle screw type spinal fixation devices.
K. ; Ebraheim, N.A; Biyani, A; Rengachary,S; Faizan,A: Role of mechanical factors in the evaluation of pedicle screw type spinal fixation devices.

One of the factors affecting properties of lightweight concrete (LWC) is the physical and mechanical properties of aggregates used [1].
Specific gravity factor, bulk density, and gradation are among several other properties that can alter expected performance.
In addition, several mechanical and physical properties of the LWA sources were evaluated and summarized in Table 2.
At this stage all mixes achieved the required mechanical properties for structural lightweight concrete.
It was found that exposure to the wet/dry cycles slightly affected the mechanical properties of the mix and the RCPT values.

The chemical compositions, mechanical characteristics of SiC and the factors which affect the polishing precision and quality are analyzed.
Fig.1 Schematic diagram of chemical mechanical polishing 3 Test conditions and parameters selection of polishing For SiC in chemical mechanical polishing process, polishing, polishing pad ratio selection, pressure and velocity determination which is to obtain high removal rate and high quality polished surface are important factors. 3.1 Polishing liquid and ratio Polishing liquid comprising water, polishing powder and some additives ( surface active agent, stabilizer, dispersing agent ) etc., that are suitable for polishing liquid can reach the chemical action and mechanical effect of the best effect, high polishing efficiency, good quality.
But the good fluidity, is not easy to precipitate or cake, due to its good suspension property and no toxicity.
dz/dt=KP(x,y,t)V(x, y, t) (2) In the formula, K is the constant of proportionality, by speed and pressure outside of the factors, such as polishing material, the material of the workpiece, and a polishing material, concentration, as well as environmental temperature, humidity.
Many factors affect the efficiency and quality of polishing processing.

Effect of Corrosion on Mechanical Properties of Rebar HRB335 Ying Wang, Ping Li a Department of Civil Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China aeappol@163.com Key Words: Rebar HRB335, Corrosion behavior, Corrosion rate, Mechanical properties Abstract: The corrosion behavior of rebar HRB335 in simulated concrete pore solution (3.5 wt.% NaCl solution) and the tensile mechanical properties before and after corrosion were investigated.
The research on rebar corrosion and its effect on the mechanical properties of rebar are increasing [7-10].
The cylindrical samples (Φ14mm×450mm) are used for corrosion rate measuring and mechanical properties tests.
These will affect the strength properties of reinforcing bar.
Maybe the effect of stress concentration on each strength property is not familiar, or there can be other affecting factors.

Fabrication and Measurement of Flexible Polymer Aerogel and Factors Affecting its Thermal Conductivity Jiazhen Wang1,a, Jing Du1,b and Yunbo Wang2,c* 1Nanjing Foreign Language School, 30 East Beijing Road, 210008, China 2Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA90095, United States ahhhwjz2@outlook.com, bdu_j@nfls.com.cn, cyunbo0527@g.ucla.edu Keywords: Polymer Aerogel, Sol-Gel Technique, Ambient Drying, SEM Abstract.
The analysis based on SEM pictures shows that PVC type and concentration would greatly influence aerogel’s structure thus affecting its thermal conductivity.
The material chosen for the aerogel is one of the most critical factors, and we choose PVC for the following reasons: l First, PVC is commonly used, cheap, safe, and has excellent mechanical properties.
Experiment Design Fifteen control groups are set up to study how the concentration of the PVC-DMF solutions and characteristics of PVC powders affect the aerogel's properties.
Thermal properties of organic and inorganic aerogels 1994 Journal of Materials Research, 9(03), 731–738

Dispersion of the Steel Structure and its Effect on Magnetic and Mechanical Properties of Steel Roman A.
Often, for operational control of mechanical properties, magnetic parameters are used such as, for example, the coercive force.
Both mechanical and magnetic properties of steel are associated precisely with the structure of the material.
One of the main properties to which stringent requirements must be imposed are mechanical properties of the material, which determine its service life.
This connection can be used to develop a non-destructive method for monitoring the mechanical properties of steel.

The paper presents a numerical and experimental approach for the quantification of the thermo-mechanical properties in multi-pass weld’s heat affected zone (HAZ) of low alloy steel “S355J2+N”.
This affects in a complex way the microstructure transformations and thereby the local thermo-mechanical properties.
The aim of the presented work is the experimental determination of the thermo-mechanical material properties during multi weld thermal exposure.
Furthermore, the work identifies the relevant influence factors on the microstructure transformations and thermo-mechanical properties of the HAZ of multi-pass welded joints.
Summary This paper presents some results of an investigation of the thermo-mechanical properties of the HAZ which experienced multi-pass welds.

Research on Transverse Prestress Mechanical Properties Experiment of PC Box Girder Yi Zheng, Jianzhang Chen, Kechao Zhang Research Institute of Highway, MOT, Beiing, 100088, China Key Laboratory of Bridge Detection & Reinforcement Technology, Beiing, 100088, China National Engineering Laborary for Bridge Structure Safety Technology, Beijing 10088, China y.zheng@rioh.cn Key words: PC box girder, transverse prestress, steel wire, experiment, mechanical properties Abstract.
In view of the PC box girder transverse prestress tendon, the factors and the development of tension prestress performance affecting factors were analyzed.
Steel wire itself properties including yield strength, ultimate strength, relaxation properties, anchor performance mainly reflects the anchorage performance of steel wire under load [2]。
Through special processing, steel wire material including cold treatment, heat treatment can achieve higher mechanical properties [3].
Mechanical properties of steel wire with the tension time test and analysis. 2 hours after loading the relaxation steel wire, will gradually ease.