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Box 10, 50728, Kuala Lumpur, Malaysia maleque@iium.edu.my; yabi78@yahoo.com Key words: Milling parameter, CNT-Al nanocomposite, Homogenous dispersion ABSTRACT The dispersion quality is the major concern in nano-composite development as it determines the homogeneity of the enhanced mechanical and tribological properties of the composite.
Many researchers reported that a relatively small amount of nanoscale reinforcement can have a notable effect on the macroscale properties of the composite due to the large amount of reinforcement surface area [5, 6].
For example, reinforcement of carbon nanotubes into the metal matrix enhanced the thermal conductivity and electrical properties, heat resistance or mechanical properties such as stiffness, strength and resistance to wear and damage.
Agarwal, An analysis of the factors affecting strengthening in carbon nanotube reinforced aluminum composites.
Borah, Fabrication and properties of dispersed carbon nanotube–aluminum composites.

Influence of Nitriding Treatment on Practical Properties of Eutectoid Steel W.
Surface hardening, refined microstructure and compressive stress were the three main factors being responsible for the modification of fatigue properties.
Introduction Ion-nitriding is one of the most widely used thermal-chemical methods to improve the mechanical properties of traditional and new materials.
Table 1 and Table 2 list the chemical composition and mechanical properties of the test material, respectively.
The residual stress is another main factor that affects the fatigue strength.

Besides, the sequence results of influencing degree of the factors affecting the compressive strength and workability were obtained.
The results indicate that the compressive strength and slump of GHPC are affected by various mix proportion factors with different sensitivity, and the sensitivity could be well analyzed by the grey relational analysis.
Besides, the sequence results of influencing degree of the factors affecting the compressive strength and workability were obtained.
The results indicate that the compressive strength and slump of GHPC is affected by various mix proportion factors with different sensitivity.
Zhang, Combined effect of polypropylene fiber and silica fume on mechanical properties of concrete composite containing fly ash, Journal of Reinforced Plastics and Composite, 30 (2011) 1851-1860

The analyses on stress distributions and concentration factors of the two joints in different external loadings were made in this paper.
Physical Properties and Parameter.
Stress Concentration Factor (SCF).
[4] Tenglun Zhao: Application of ABAQUS 6.6 in Mechanical Engineering.
[6] Yi Zhang: Finite Element Analysis on Stress Concentration Factors and Stress Intensity Factors of Typical Welded Joints.

There is a need for metals and alloys with a high complex of physical and mechanical properties in order to optimize and improve the design of machines, reduce the mass of products and energy costs, and increase the service life of devices.
Therefore, recently, in the field of metal forming, there has been an increase in interest in the development of technologies that allow obtaining metals and alloys with a ultrafine-grained structure, which have an increased level of mechanical and operational properties, due to the implementation of severe plastic deformations in the volume of workpieces.
But the influence of these geometric factors on one of the main factors limiting the use of certain geometric parameters of the deformation process, such as the accumulation of damage by a metal or alloy during the deformation process, has not been previously studied.
In order to study the influence of geometric parameters during pressing in an equal-channel step matrix on the accumulation of damage, 9 models were constructed taking into account the studied geometric factors affecting the production of the UFG structure.
Claro, Influence of ECAP on the structure and properties of Ti18Zr15Nb and Ti10Mo8Nb6Zr alloys for medical application, IOP Conference Series: Materials Science and Engineering. 1014 (2021) 012006

Selective laser melting (SLM) is a manufacturing technology of metal parts of any shapes with target mechanical properties by means of laser melting.
Scientists investigate formation of a structure, being the result of numerous factors in the process of SLM [10].
This fact influences SLM and characteristics of a final product, e.g. density, microstructure, mechanical properties etc. [11, 12].
Key factors to cause an uneven surface are vapor pressure, Marangoni effect, and a heat effect of a melted powder.
Being on the melting surface, hardened drops affect the deposition of the next powder layer and final qualities like density, microstructure, mechanical properties etc.

It can be found in numerous engineering areas such as marine, manifolds, motor casings, cast doors, pumping applications due to their properties.
Table 1 Mechanical properties of LM6 [3].
Table 2 Factors and levels selected for the experiments.
It can be concluded that peak current was the main factor affecting MRR, EWR, and Ra.
The others factors such as voltage, pulse on time and pulse off time are less significant in affecting the responses.

The analysis aims to identify the mechanisms responsible for service failure of an API 5L grade A pipe after about two years and, also, to mitigate further damage phenomena by a proper identification of the contribution of mechanical, metallurgical and environmental factors (focusing both on technological fluids characteristics and inhibition scheme).
Secondary corrosion damage phenomena As result of heavy dimensional alteration of wall thickness and environmental sudden changes (pH variation to alkaline domain and amine compounds presence on bare metal surfaces affected by erosion) there were created premises for the occurrence of secondary corrosion phenomena: as result of combined action of environmental and mechanical factors - fig. 7.
Figure 7 Figure 6 Discussions The above mentioned data analysis showed that responsible phenomena for in-service failure of pipeline are due to synergic action of hydrodynamic factors, environmental and mechanical factors.
Also, could be mentioned as responsible certain geometric factors (design) for the analysed sample /1/.
Mechanical factors are prevalent (erosion), but there is an important contribution of the environmental factors that concur to pipeline failure.

Using creep equation by experimental data, 3D numerical simulation for creep properties of deep soft tunnel under coupling effect of temperature field, chemical field and stress field are conducted by ANSYS, and different effects of these fields on deep soft rock tunnel creep properties are analyzed, what’s more time-creep curves of different temperature, pH value and stress deviation of the mid-point of the top of tunnel are obtained.
The above studies are thermal-stress and chemical-stress coupling studies, but study on creep properties of thermal-chemical-mechanical coupling for deep rocks has not been published.
That illustrate not only creep is the main source of the strain of deep soft rock but also shows that the temperature is one of the factors of deep soft rock creep.
That explain stress deviation is an essential factor to affect the strain of deep soft rock, and the greater deviation, the greater creep.
[3] Kaiyuan Guo:Study on Creep Properties of Salt Rock(chongqing university,Chongqing 2003)

Influence of replacement ratio and water-cement ratio on the recycled concrete mechanical properties were analyzed by testing the compressive strength and tensile strength of the recycled concrete.
Results show that the mechanical properties of recycled concrete, compared with common concrete, can meet the requirements of the project.
The study of the physical properties of recycled concrete carried out in recent years, but there is little research on the structure properties and components with recycled arrgegate.
In this paper, splitting tensile strength and compressive strength of recycled concrete were mensurated , influence of water-cement ratio, recycled aggregate replacement ratio and other factors were analyzed as well.
Cement and Concrete Research, 2005, 35: 1187-1194 [4] Standard for test method of mechanical properties on ordinary concrete (China Architecture & Building Press, China 2002)（in Chinese） [5] Standard for evaluation of concrete compressive strength(China Architecture & Building Press, China 2010)（in Chinese） [6] Li J.