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Mechanical Properties Hardness The mechanical attributes of composite materials are strengthened by the matrix properties, interphase wettability, and the characteristics of secondary phase particulates.
Test experiments were designed according to Taguchi’s orthogonal array L16 by assuming 4 wear factors and 4 levels.
The wear control factors and levels are depicted in the Table 3.
Wear factors and levels.
A review on mechanical properties of stir cast Al-2024 metal matrix composites.

The durability largely depend on permeability of concrete, and Cl - permeability test can be used to evaluate the permeability. [1] Chloride ion intrusion is main factors that lead to steel corrosion, which determines the service life of concrete structures and is the important issue on concrete durability.
Mechanical properties of compressive strength at different ages, chloride ion permeability of concrete using electric flux test method, the conservation of specimens after 28 days to make a diameter Φ = 100 ± 1mm, height h = 50 ± 2mm of the cylinder specimens tested 6 hours through the concrete test block total power consumption and chloride ion penetration depth.
The incorporation of fly ash will reduce the early strength of concrete, and decreased with increasing dosage, but with the increasing age, increasing strength of concrete; slag powder mixed with the early strength of concrete have a negative effect, with age substantial increase in the intensity of growth; silica fume added on the mechanical properties of concrete was significantly improved.
Figure 3 shows when the gas content <5%, little effect on the mechanical properties of concrete, but when the gas content> 5%, will significantly reduce the mechanical properties of concrete.
Conclusions (1) Air content of concrete increases with the water-cement ratio. when air content is <5%,it has little effect on the mechanical properties of concrete, But it would decrease the mechanical properties of concrete when air content is > 5%

This is because at high temperature, the failure is determined by the changes of mechanical properties of adhesive.
The properties of the materials used as tabulated in Table 1.
Fig. 1 (b) shows the bulk specimen shape and dimensions were manufactured according to ASTM D 638-02 standard used to determine the mechanical properties of adhesive.
Tensile stress-strain curve of bulk adhesive tested Bulk adhesive specimens as shown in Fig. 3 (a) were also used to determine the mechanical properties of adhesive at different temperature range.
This is because at high temperature, the failure is determined by the change of mechanical properties of adhesive. 35°C was optimum value of adhesive T-joint strength obtained for entire bondline thickness.

In comparison, polymers may mimic the mechanical properties of native bone, however, may lack the appropriate surface properties to seamlessly integrate with natural bone.
This approach allows for the potential to have both mechanical and chemical properties similar to that of natural bone 7.
Biomineralization of a polymer scaffold allows for mechanical and chemical properties similar to that of natural bone.
They observed enhanced mechanical properties as well as increased calcium phosphate deposition during cell culture.
Other bioactive agents being incorporated into mineral coatings include growth factors such as vascular endothelial growth factors (VEGF) and bone morphogenetic protein 2 (BMP2).

The most significant effect on quality of weld joints and their final mechanical properties has relative position of strip ends and geometry of cutting edge.
Introduction Weld quality is an important factor that should be taken into the account in analysis of process efficiency.
Appropriate choice of process parameters is not a function for maximization of welding process efficiencies, but a search for an acceptable balance between contending factors of physical and metallurgical effects.
Directly at plant was performed mechanical test of welds to approve the performance of weld by Erichsen cup test.
Katayama, Effects of laser focusing properties on weldability in high-power fiber laser welding of thick high-strength steel plate.

Furthermore, the actuation of flexural and longitudinal vibration modes in resonator bridges are demonstrated as well as their sensing properties.
The group III-nitrides are potential representatives of wide band gap semiconductors for MEMS since they exhibit promising mechanical, electronic and sensing properties (see Fig. 2).
This suggests that GaN based HEMTs are promising structures to sense those properties through modulation of the carrier density of the 2DEG.
The whole MEMS process was developed to not affect the electrical properties of the integrated 2DEG [35].
The Q-factors of several thousands under vacuum decreased to values about one thousand under normal ambient pressure.

The study of an energy efficient cool white roof coating based on styrene acrylate copolymer and cement – Part II: mechanical and water impermeability properties.
The investigations of factors affecting the water impermeability of inorganic sodium silicate-based concrete sealers.
Mechanical properties and durability characteristics of polymer- and cement-based repair materials.
Properties of polymer-modified cement mortar using pre-enveloping method.
Influence of EVA and acrylate polymers on some mechanical properties of cementitious repair mortars.

The results showed that the combination of the repair techniques can restore the mechanical properties of the damaged structures.
According to author´s thinking it is believed that combining both techniques, it can be possible to restore, or even improve, the mechanical properties of the repaired damaged material.
The combination of these two techniques can be used in the repair obtaining excellent mechanical properties.
Also the mechanical properties of a T-welded connection can be restored combining grinding and wet welding.
Cuamatzi-Meléndez, Stress concentration factors of a T-welded connection with various grinding profiles.

Concrete is a multi-phase material and many factors can affect its performance, such as water content, shape and grade of aggregate.
Experimental research on mechanical behavior of self-compacting rock-fill concrete.
Chinese Journal of Rock Mechanics and Engineering,2007,vol.26 Supp.1: 3231-3236(in Chinese) [5]HUANG Mian-song, ZHOU Hu,AN Xue-hui, JIN Feng.A Pilot Study on Integrated Properties of Rock-Filled Concrete. 
An experimental research on the fluidity and mechanical properties of high-strength lightweight self-compacting concrete.
The effect of mineral admixtures on mechanical properties, chloride ion permeability and impermeability of self-compacting concrete.

This is mainly because that the material properties are determined by several factors, such as: materials, components, organizational structure and materials preparation or processing technology, which are so difficult to use mathematical models to accurately describe that experts can not have a clear understanding of exists among them within law.
In materials science and engineering fields, there are many complex factors influencing material’s structure and properties.
These two types of relationship are affected by many factors, so the artificial neural network can be used to deal with many complex data set affected by many factors, to summarize semi-empirical laws, establish mathematical model, and accordingly predict performance of unknown material and optimize the process.
Eberhart, and Yuhui Shi, Computational Intelligence Concepts to Implementations, POSTS & TELECOM PRESS, 2009 [4] M.A.Yescas.Modeling the microstructure and mechanical properties of austempered ductile irons [Dissertation].PhD Thesis, University of Cambridage,Nov. 2001 [5] S.H.Lalam, H.K.D.H.Bhadeshia and D.J.C.MacKay.Estimation of mechanical properties of steel welds part 1: yield and tensile strength [J],Science and Technology of Welding,2000,5(3):135~147 [6] S.H.Lalam, H.K.D.H.Bhadeshia and D.J.C.MacKay.Estimation of mechanical properties of steel welds part 2: Elongation and Charpy toughness [J],Science and Technology of Welding,2000,5(3):149~160
[9] M.Marimuthu.Design of welding alloys creep and toughness [Dissertation].PhD thesis, University of Cambridge, UK, 2002 [10] F.Tancret, H.K.D.H.Bhadeshia and D.J.C.MacKay.Design of a creep resistant nickel base super-alloy for power plant applications Part 1–Mechanical properties modeling [J].