Search results

Composite is material with low-density properties consisting of robust materials [1].
Hybrid composites have better properties compared with only one type of reinforcement.
Fiber hybridization allows the balance between mechanical properties and economic value of composite [4].
The addition of zirconate titanate content will decrease the mechanical properties of glass fiber.
The decrease in mechanical properties and natural frequency of composite materials results in an increase in the composite damping factor [9].

Based on the research on screw-extrusion dehydration technology, the factors that affect dehydration production volume and efficiency of urban garbage’s recycling have been analyzed.
The main factors of geometric parameters are screw diameter, screw groove depth and helix angle, and all of these three factors can influence dehydration output and efficiency.
Many researches also studied the factors that affect screw-extrusion dehydration efficiency in plant and alcohol dehydration fields.
The above studies mainly focused on the properties of fixed material and structure analysis of single or twin screw.
All of these geometric structure, screw groove depth is the dominant factors which affect the dehydration production volume and efficiency through analysis.

Many researchers have been done so far on FSW of different Aluminum Alloys related to maximum travel speeds achieved and the respective mechanical properties.
The travel speed was varied while all other factors were kept constant.
Both these factors contribute to the temperature increase within and around the NZ.
Malek, Effect of Friction Stir Welding parameters on the microstructures and mechanical properties of 304 Stainless Steels, Eng. of Metall.,30 (2009) 26-30
Jung, Evaluation of the microstructure and mechanical properties of friction stir welded 6005 aluminum alloy, Mater.

These are caused by environmental factors such as exposure to high temperatures or direct sunlight, and contact with chemicals.
Oxidation badly affects the mechanical properties of the polymers such as reducing the tensile strength, harming the impact capacity and deteriorating the toughness rather than the fracture resistance.
We do not add other additives like stabilizers or antioxidants for uv or others because adding more antioxidants or stabilizers may badly affect the mechanical properties or other properties like producing cracks and fractures.  
The tests include mechanical properties testing, fracture properties testing, and thermal properties testing.
It will reduce or prevent the cracks and increase the mechanical (such as tensile strength, hardness), fracture properties (such as fracture toughness, crack propagation, crack initiation, crack branching,…) and thermal properties (such as linear thermal expansion factor, thermal conductivity factor, and specific heat capacity).

And much affected the mechanical strength.
Microwave heating may be caused the degradation of KGM, And KGM thus affecting the water absorption, thereby affecting the films body volume expansion.
Thus becoming the process of films degradation directly affects the integrity of the films body factors.
KGM greater impact the mechanical properties of KGM/starch composite films, it should not be mixed with too much Starch.
The optimal level of best Mechanical properties: A2B4C3D3.

Analysis on Mechanical Properties of Tunnel Lining on Fire Weimin Wang Shanghai University, Fire Corps of Ningxia Autonomous Region,China wangwm119@126.com Key words: Tunnel; Lining; Fire; Hyperthermia; Mechanical Property Abstract: The paper analyzes the fire-resistant performance of big tunnel structure by setting up the analyzing model of tunnel-surrounding, choosing the characteristics of concrete, according to the lengthways and crosswise temperature distribution in specific scene of fire, analyzing the temperature and stress field of the tunnel structure, and knowing the basic rules and the damage of the lining and inner equipment of the tunnel by high temperature which is set on the Shanghai Yangtze tunnel.
Concrete is a kind of non-homogeneous composite material, which would experience complex changing both physically and chemically by the high temperature, and the changing will surely lead to the descent of the carrying capability of the integral mechanical properties.
Fig.1 Double Line Tunnel and Fig. 2 Finite Element of Double Line Contact Gallery Model Tunnel structure Model Material characteristics The basic performance of material can be divided into thermal property and mechanical property.
The main thermo technical parameter and the mechanical property parameter in high temperature refers Guo zhen hai’s and Lu zhou dao’s vend data, and the European standard as well.
Under the impact of such inclement factors, the fire-resistant time should be at least twenty or more than thirty minutes in order to ensure the normal mechanical property of the tunnel structure.

The use of numerical methods such as finite element (FE) and mean field homogenization (MFH) can assist in predicting MMC properties thus reducing time and cost of optimizing composite properties through experiments.
The thorough understanding of how the microstructure of heterogeneous materials affect the effective properties aids in accurate prediction of effective properties and assist in design and development of high performance composite materials [2].
There is not much literature on FE-based simulation of thermal and mechanical properties of rGO reinforced Al composites taking into account the thermal history of the composite.
MFH does not factor the ability of heat to flow around voids in its formulation.
Bunch, “Mechanical and electrical properties of graphene sheets.”

This study investigated how the dynamic mechanical properties (chemical composition) of polymer layer affect the noise damping of wood/polymer/wood sandwich composites.
Dynamic mechanical properties and loss factor (tanδ) of polymer materials were measured with Rheovibron DDV-Ⅱ (Toyo Baldwin co.) at a frequency of 110Hz and a heating rate of 1°C/min in a tensile mode.
For the acoustical measurements at several temperatures, the panels were cooled or heated to control temperature before being tested Results Dynamic mechanical properties.
Table 1 shows the dynamic tensile properties of E-VAc copolymer, the loss factor of wood/polymer/wood sandwich composites in bending mode and the impact sound pressure level (dB(A)) of sandwich composites.
However, the dynamic mechanical properties of E-VAc copolymer are different from those of random copolymer.

The result shows that the mechanical load, which is affected mostly by height of fire field, is the major stress.
Analysis of Coupling Stress of Mechanical Load and Thermal Load Marc which is the equation solver in PATRAN is employed to compute the coupling factors in this paper.
Analysis of the Influence on Experimental Factors Ranges of all factors are calculated according to the experiment results.
With the same way, the influence tendency and influence degree of three factors on the mechanical stress and on coupling stress that piston endures are approximately consistent.
The height of fire field is the major factor to affect mechanical load.

Also, the master curve of tensile properties are drawn using predetermined shift factor and the results are discussed.
Also, tensile tests are performed to get mechanical properties of solid propellant.
Based on the properties, the master curves of maximum stress and strain at maximum stress are plotted by using predetermined time-temperature shift factor.
(2b) Where ER is Relaxation modulus,aT1T0 and aT2T0 are the shift factors in relation to the T0 reference temperature.These shift factors, aT can be obtained from the horizontal shift according to reference temperature T0.
These tensile properties are horizontally shifted using the shift factors which were obtained eariler.