Search results

A subsequent aging treatment leads to a further increase in mechanical properties.
Mechanical properties of the surface were investigated by microhardness measurements (HV0.3).
B: bainite, GB: granular bainite, PF: polygonal ferrite Mechanical properties.
Mechanical properties of the cross section were studied by careful microhardness measurements.
Influence of pre-strain and aging temperature on mechanical properties.

In recent years, people applied more high-performance aramid fibers, polyimide fibers and other inherent flame retardant fibers with aromatic or ladder-like heterocyclic chain structures [1] in the production of fire-protection clothing as these fibers have excellent performance against flame and high temperature, and have good mechanical properties.
These cracks, along with plenty of wider cracks in the lower right corner appeared after shrinking, will together affect the practical application of their protective properties.
However, the mechanical properties of flame retardant viscose produced by Lenzing is only 2.4cN/dtex while aramid fiber is generally more than 1313 3.5 cN/dtex and aramid 1414 is close to 20 cN/dtex [7], thus it reduces the durability of woven fabrics after the adding of this viscose.
We can see from Table 5 which lists different mechanical properties towards three outer woven fabrics that, the adding of flame retardant viscose produced by Lenzing would bring about a significant reduction of breaking force and tear strength of the fabric, thus affecting its durability.
And the adding of proportional flame retardant viscose could help us solve this problem, but at the same time may also lead to obvious decrease in mechanical properties, thus affecting its durability.

It is known that the level of adhesion between the fiber and the matrix is ​​an important factor affecting the mechanical properties of a composite material.
The fiber / matrix interface is strongly related to the structure and properties of composites.
Introduction There are several models on the relationship structures and properties of the composite fiber / matrix interface [1].
Ko et al. [6] use dynamic mechanical analysis (DMA) to observe changes in interfacial properties fiber / epoxy.
The adhesion is not an intrinsic property but depends on several factors such as interfacial energy, the energy dissipation during test and during the deformation of materials, internal stresses, and the geometry of the samples.

Pereira2,d 1Universidade Federal de Minas Gerais, Department of Mechanical Engineering, 6627 Antonio Carlos Avenue, Belo Horizonte, MG 31270-901, Brazil, Phone: + 55 31 3409-5238, FAX: +55 31 3443-3783 2Universidade Federal de Minas Gerais, Graduate Program in Mechanical Engineering, 6627 Antonio Carlos Avenue, Belo Horizonte, MG 31270-901, Brazi aavila@demec.ufmg.br, bmarqsaline@gmail.com, cvivismunhoz@gmail.com, dcarleyone@hotmail.com Keywords: Graphene, Carbon Nanotubes, Composite Materials, Mechanical Properties, Nanostructure Morphology.
This high stiffness and elevated strength (Tang et al [6] reported a 130 GPa value), can be attributed to two factors, i.e. the elevated specific surface area (≈ 2600 m2/g) and the strong carbon-carbon covalent bonds.
Among those researchers are Kim et al [8] whom described no significant increase on tensile properties of the addition of CNTs to carbon fibers/epoxy laminates.
The traditional tensile tests using ASTM D 3039 specimen provide the trend how the nanostructures affect the overall laminate stiffness and strength.
Another important issue is how the nanostructures can affect the interlaminar shear strength based on short-beam three point bending tests (ASTM D 2344).

However, stress relaxation and creep are the unique properties of resin matrix composites, which can affect the residual stress and deformation in some degrees.
Introduction Fiber reinforced resin matrix composites, which drive the revolution in the field of material application, have been widely used in aerospace, automobile, medicine and many other industries due to their superior mechanical properties [1-3].
An appropriate constitutive equation for composites is necessary to model the variation of their mechanical properties, which is related to the accuracy and validity of the simulation.
Rp is partition factor, Wm and tm are the weighting factor and relaxation time of the mth branched chain, respectively.
The main reason is that the viscoelastic property of composites is weakened gradually with the increase of fiber volume fraction.

Moisture severely affects aerospace structures and offshore platforms during their service life span.
Composite materials allow moisture to be absorbed through the environment, which severely affect the structural integrity of structures [3,4].
The reduction in mechanical properties is often due to degradation at matrix/fiber interface [7,8].
Hahn, AFM characterization of the interfacial properties of carbon fiber reinforced polymer composites subjected to hygrothermal treatments, Compos.
Jiang, Surface and interface properties of carbon fiber composites under cyclical aging, Appl.

Thermal properties are one of the most important factors that determine the usage of a material.
Secondly, heat treatment is needed in some cases for natural fibers to improve the mechanical properties of the resulting composites.
When natural fibers are used as a reinforcement in composites, a quick process and a dry environment is necessary to minimise moisture absorption, as water content in natural fibers is a critical factor affecting the properties of hemp fiber composites.
Hemp fiber composites were made using different methods and the mechanical properties of the resulting composites were compared at Table 3.
There is hardly any reinforcing effect in this case and higher fiber fraction is required to achieve better mechanical properties.

So as to improve its mechanical properties, the section steel is added in the shaped reinforced concrete columns.
The numerical method was adopted in this article to compile a computer program[3] of full-range nonlinear analysis which can be used for the further research on the mechanical properties of steel reinforced concreteT-shaped columns (SRCTSC) subjected to biaxial eccentric compression.
of SRC_T1 Factors affecting sectional curvature ductility Influence of loading angle.
Influence of other factors.
Therefore, the load angle ,axial compression ratio ,the ratio of stirrup spacing and the diameter of longitudinal reinforcement ,are all the major factors affecting the SRCTSC subjected to biaxial eccentric compression, meanwhile, the curvature ductility coefficient and a, n, s / d meet certain numerical relations.

At higher tearing energy, beside other factors affecting the FCG performance of the RRP compounds, both higher absolute and relative hysteresis loss are slightly detrimental to the crack growth rates.
The non-linear correlation between the properties indicates that factors such as SIC plays an important role at specific dynamic strain amplitudes and could partially delay the crack growth rates of the rubber compounds.
Kutty, Cure characteristics and mechanical properties of natural rubber/reclaimed rubber blends, Polym.
Makmoon, Effect of curing system on the mechanical properties and heat aging resistance of natural rubber/tire tread reclaimed rubber blends, Polym.
Fatemi, Factors that affect the fatigue life of rubber: A literature survey, Rubber Chem.

It is known that in the process of long-term operation of steel tanks in the main material and welded joints the structural changes occur, which lead to changes in mechanical properties and affect the weldability of steel.
Failure to take these factors into account when carrying out repair work can lead to premature failure of structures, increase in the volume and cost of repair work.
In the article [1], the influence of the number of repairs of the welded joint of the roll billet of the tank wall of steel st3sp and 09G2S on its mechanical properties was studied.
Materials and Methods As the main metal for the preparation of the edge for welding, a high-strength grade of steel S700MC with a thickness of 6 mm was used (chemical composition and mechanical properties are given in table 1 and table 2).
Elsukov, Study of the effect of welded joint repairs number on its mechanical properties, Bulletin of SUSU.