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Then mechanical properties of aged rubber specimens are measured and compared.
Basic mechanical properties such as modulus, tensile strength and elongation at break, etc. can be determined from these curves.
Ultraviolet can change NR properties apparently.
(a) Thermal oxidation test (b) Ozone test (c) Low-Temperature ozone Test (d) Ultraviolet radiation test (e) Salt water cycle test (f) Acid rain cycle test Fig.7 Property changes of NR in accelerated exposure tests The test results reveal that thermal oxidation affects NR properties much more dramatically than other factors such as ozone, ozone in low temperature, salt water and acid rain.
Ultraviolet irradiation also affects NR properties, and it also produces cracks on the surface of NR.

Titanium alloys have a number of properties that make them desirable for many applications.
The factors that affect twinning during low temperature creep will be discussed, including grain size, phase stability, and the presence of interstitial impurity elements.
Among the factors that affect twinning during low temperature creep of α-Ti is the grain size of the alloy.
This suggests that β-phase stability significantly affects the creep properties of the two-phase α−β Ti alloy.
It has been found that a number of factors affect twinning during low temperature creep.

We intend is to optimize the properties of the GPMs using different FA activation approaches, which will make it possible to improve the physical-mechanical properties of the binder.
The resulting geopolymer structure, represented by sodium aluminosilicate hydrogel, called as N-A-S-H gel, has exceptional mechanical properties [4].
There are many factors affecting the physical-chemical properties of FA including coal- and boiler-types and operating and post-combustion conditions.
We aim to optimize GPMs’ properties through various FA activation approaches, which improves the physical-mechanical parameters of the binder.
Kumar, Mechanical activation of fly ash: Effect on reaction, structure and properties of resulting geopolymer, Ceram.

Discussion on Masonry Structure Model Mechanical Property Test Gonglian Chen a and Linjun Si b 1School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450011, China achengonglian@gmail.com, bsilinjun1980@163.com Keywords: masonry; mechanical property; test.
Introduction In structure mechanical property test, because of the prototype structure test has many shortcomings, such as large investment, long period, strict laboratory equipment, measurement accuracy is affected by the environmental, and so on, the structure model test played an important role in the research of structure engineering.
Masonry Material The masonry structure is a composite material of bulk materials (brick, block) and the mortar, from the material sense, the mechanical properties of the masonry structure to simulate is too complex, the reason is that: masonry is a composite material, all part of the component must be simulated, such as brick and block, mortar and steel.
Because of the difference of the size between the model specimen and prototype specimen, its mechanical properties are also different to each other.
The former approach in determining has a great chance and human factors, and the latter approach is more direct and objective.

In some conditions, there will be a great deal of and larger grains on the surface of films because of small differences in deposition time, thus affecting the optical electrical, properties and limiting the application of CdSe films [10].
Electrochemical workstation (Corrtest) was used to test electrical properties. 3.
By analysis of the test results (Table 1) and calculating the absorbance and the very poor S of the various factors, pH value has been the biggest factors in poor, thus the main factors which affecting the CdSe film absorbance is the pH value.
Fig. 2 I-V curves of CdSe films 3.3 Surface morphology of CdSe thin films by AFM Fig.3 AFM imagine of CdSe films According to the main factors affecting the absorption is pH value, We changed the preparation of samples 3 PH, and tested their surface morphology.
Highly dispersed nanosilica-epoxy resins with enhanced mechanical properties, J.

Single-layer mechanical fastening waterproofing systems Tomáš Petříček1, a *, Petr Kacálek 2,b, Radim Smolka 3,c 1,2,3 Brno University of Technology, Faculty of Civil Engineering, Institute of Building Structures, Veveří 95, 602 00 Brno, Czech Republic apetricek.t@fce.vutbr.cz, bkacalek.p@fce.vutbr.cz, csmolka.r@fce.vutbr.cz Keywords: Flat roof, single-layer waterproofing, bitumen sheet, mechanical fastening system.
Single-layer mechanical fastening waterproofing systems are often used within the compositions of flat roofs.
There are some key factors which all of the one-layer mechanically fastening systems should meet, especially water-resistance and resistance against the suction of wind.
On the other hand if the anchors are too far away from the edge of the foil (or sheet) the watertightness of the joint may be affected.
Experimental measurements Properties of the joints of the mechanically fastened waterproofing layers can be tested on sample segments of the roofing exposed to defined stress in a pressure chamber.

It was founded that the microstructure of sintered alloys very strong correlated with the type of initial powders that, nevertheless, not affects on mechanical properties of sintered alloys.
This fact as the strain hardening also can affect on the tribological properties of Al-40Sn alloy.
To evaluate the effectiveness of mentioned above factors on the behavior of the alloy under the dry friction, the power their influence need to separate.
Further thinning of the aluminum interlayers is almost no affect the character of Sn distribution on the friction surface and therefore does not change the tribological properties of surface third body.
The microstructure and mechanical properties of two-phase Al-Sn alloy, subjected to severe plastic deformation by ECAP-A// Izvestia vuzov.

In order to improve corrosion resistance and mechanical properties of magnesium alloys, titanium with high specific strength was warm roll-bonded on the surface of AZ31 magnesium alloy sheets.
This texture significantly affected tensile properties of clad sheets, resulting in lower proof stress and higher elongation at the rolling direction than at the transverse direction.
Mechanical Properties.
To explain anisotropic tensile properties of the AZ31/Ti sheets with main orientations of (01110)[0 551] for the AZ31 layer and (1214)[1010] for the titanium layer, Schmid factors for basal slip of magnesium are listed in Table 1 together with Schmid factors for prismatic slip of titanium that has the lowest CRSS.
However, twining itself may hardly lead to marked anisotropy of mechanical properties, although deformation twins were observed in the AZ31 layer of tensile tested specimens.

Thermal residual stress is one of the most important factors that affect the mechanical properties of composite materials.
The longitudinal stress on the interface between matrix and fiber is the main factor resulting in debonding failure of composites.
Introduction Fiber-reinforced composites are widely used in aircraft structures [1-3], because it has a lot of unique properties, such as high modulus, light-weight, high failure strength, low creep and good performance at elevated temperature [4].
Among the factors that affect the mechanical performances of composites, thermal residual stress, produced by the curing and cooling process, is a very important one.
Fig.1 (a) Geometry model (b) Cross-section of a quarter Fig.2 Radial stress distribution at the fiber surface of the unit-cell (c) Three-dimensional finite element model (d) the path investigated The matrix is modeled as an isotropic linear material, whose thermal properties and mechanical properties are temperature dependent.

This material can act as a microreinforcement improving mechanical properties of cementitious materials.
The effect of 0–1 wt.% addition of CNTs on the mechanical properties, hydration characteristics and microstructure of AAS binder was determined.
The type and dosage of the activator as well as curing conditions have a significant effect on the course of the hydration process and final mechanical properties [2].
Results and discussion Mechanical properties.
Day, Factors affecting early hydration characteristics of alkali-slag cements, Cem.