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The three factors, five level rotatable central composite design are selected to optimize the responses of friction stir welded AA 8011 aluminium alloys.
Huijie Zhang et al., [9] mathematically developed the models to predict the tensile strength of underwater FSWed aluminum alloys and the rotational and travel speeds are the predominant factors that affect the tensile behavior of the welded materials.
Elatharasan G et al., [10] examined the tensile properties of friction stir welded AA 6061-T6 aluminium alloys with the optimum conditions.
Table 1 Chemical compositions and mechanical properties of AA 8011 aluminum alloy Chemical composition (Wt. %) Mechanical properties Al Cu Fe Si Mn Mg Zn Ti Tensile Strength Elongation % Density Kg/m3 Bal 0.13 0.7 0.5 0.5 0.3 0.1 0.02 110 MPa 25 2689 The chemical composition, mechanical properties of AA 8011 aluminium alloy plates are shown in Table 1.
From this investigation, · The mechanical properties of welded alloy plates reveals the good quality of weld based on the strength and hardness

Friction and Wear of Traditional Gear Transmission Gear wear is a very complicated process, and the influencing factors of wear include friction pair material, lubrication condition, operating conditions (load, sliding speed, the system vibration, temperature, etc.), surface morphology, etc.
Without any lubricant, there are three factors to generate friction between polymer composite surface and contact surface: The adhesion of polymer and metal dry friction surface, the hysteresis of polymer itself and metal plough cutting action to polymer [6].
In the actual process of friction losses, generally four types of wear mechanisms will happen together, but which wear mechanisms plays a role of main depends on the properties of polymer itself.
Thus the shear strength of the polymer itself determines the transfer characteristic of material and adhesive wear properties [7].
It is mainly affected by the surface properties of hard material (such as micro convex body height, radius of curvature, slope, etc.), mechanical properties of the polymer itself (toughness and fracture work) and environmental factors.

Factors such as prior austenite grain size, promotion of fine lath marteniste and even carbide distribution may be required for high temperature properties.
This base steel has been modified by some alloying additives targeted at improving corrosion or mechanical properties.
These steels have superior mechanical [ultra high strength levels] properties and their corrosion properties comparable to that of 304 stainless steels.
Martensitic and PH grades are control cooled and are given a soft annealing treatment at every stage of its processing. 5.0 Mechanical Properties Stainless steels give a wide range of mechanical properties.
Fig.12 Typical high temperature mechanical properties of some of stainless steels [18,19].

The residual stress manifested from higher to lower in the depth direction of the coatings Introduction WC-Co coatings are professional materials using for protecting in the wear circumstance for its excellent mechanical properties.
In recent years, the researches about the WC-Co coatings’ mechanical properties were highly concerned.
M.Watanabe discussed the influence of different WC-Co particle size on the HVOF sprayed interface fracture toughness, the consequence demonstrated that the microstructure, density, the WC particles embedded in the coatings and the volume in the binder metal are all the important factors which affect the coatings [4].
In this paper, nanostructured WC-17Co coatings, nanostructured WC-12Co coatings, conventional WC-17Co coatings were prepared by HVOF spraying technology to investigate the mechanical properties and the residual stress, which may provides an appropriate theoretical basis for the application of WC-Co coatings.
The micro-crack spreads along the phase interface where the brittle phase are more in the Co rich area , where there are more different properties in the Co rich area and W rich area, where there are more defects close to the intend end in the W rich area, even spread through the WC particles in microcosmic.

The mechanical properties under compression and the elastic modulus of the cermets were characterized from room temperature to 1400°C.
At 1400°C, both cermets suffered a significant deterioration of their mechanical properties due to a presumed chemical degradation of the individual components.
Both combine their properties of toughness, thermal, chemical and mechanical resistance, resulting in an improved material [2][3].
Therefore, the characteristics of the precursor wood can affect the mechanical behavior of the material to some extent.
This deterioration of mechanical properties can be attributed to several factors, such as degradation of individual components (SiC, Si, TiSi2), accelerated oxidation, and microstructural changes induced by high temperature.

Experimental Procedure We carried out standard mechanical tensile tests and X-ray analysis using the well-known procedures [2, 3] since strength is one of the main factors determining the serviceability of modern devices of semiconductor electronics, in particular, photodetectors and solar cells (both active elements and optical windows can be constructed from III-VI materials) [7-12].
It is necessary to identify and remove defects caused by scratches in the course of production, polishing, and grinding in order to exclude damages affecting the quality of semiconductor photodetectors and solar energy devices.
Liquid neutral, acid environments as films (or drops), which are formed on the spot of these electrodes has influenced on the surface characteristics of the investigated semiconductors, thus study of structure changing on nanoscale and electrochemical properties are necessary for finding out of principle of action of new photoelectrochemical units for transformation of sun energy [13].
Mechanical properties of gallium and indium selenides in initial state (upper values) and hydrogenated (down).
Faber: The mechanical properties of semiconductors (Academic Press, San Diego 1992)

According to the deep analysis of material's mechanical properties test data, the author makes a study on the strength mechanism of the concrete material.
However, due to the varieties in material production process and material shape as well as the influence of the mechanical properties and aggregate size, the strength mechanism of them is different.
The development process of failure modes and mechanical factors in all periods (the rising period, the declined curve unable to measure because of loading equipment) are similar to ordinary concrete.
When filled with high fluidity self-compacting concrete, it will rely on the interface bonding to ensure its overall mechanical properties.
The results show that, The large size aggregate self-compacting rock-fill concrete remains essentially is concrete, thus, compared with formal concrete, mechanical properties of it shows some similarity.

It is shown that the external (outer) surface layers that form around disperse filler particles is one of the factor responsible their mechanical properties.
A solution of this problem requires comprehensive investigations of the structure and properties of epoxycomposite materials, methods of improving mechanical characteristics, study of the effect of operating conditions on the behavior under loading [4, 5].
Niihara, Mechanical property improvement of carbon fiber reinforced epoxy composites by Al2O3 filler dispersion, Mat.
Asi, Mechanical properties of glass-fiber reinforced epoxy composites filled with Al2O3 particles, Journal of Reinforced Plastics and Composites 28 (2009) 2861-2867
Psakhie Modeling mechanical behaviors of composites with various ratios of matrix-inclusion properties using movable cellular automaton method, Defence Technology 11 (2015) 18-34.

Experiments are ongoing to measure the properties of the blocks for further application as a new construction material.
Some factors affecting the formation of a heat island are the intensive use of asphalt and diverse construction materials, mainly concrete [1].
Fig. 4 Absorption of WRB Fig. 5 Volume of water-retention of WRB Fig. 6 Compressive strength of WRB Fig. 7 Surface temperature of WRB Mechanical properties of water-retentive block Compressive strength of WRB was shown in Fig. 6.
Thermal properties of water-retentive block The surface temperature of block pavement was monitored as shown in Fig. 7.
Experiments are ongoing to measure the properties of the blocks for further application as a new construction material.

As shown in Figure 4, different machine parameters control the strength of the part in FDM, and layer orientation affects the mechanical properties of the printed part [16].
The mechanical and melting properties of PLA specimens are shown in Table 1.
A case study of 3D printed PLA and its mechanical properties.
Mechanical properties of bio-absorbable PLA/PGA fiber-reinforced composites.
Mechanical properties of PLA-graphene filament for FDM 3D printing.