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Material Properties In order to predict the response of dynamic pile subjected to impact loading during pile driving process, material mechanical properties are needed as an input for the simulations.
The properties of the HAZ however, is unknown.
In this paper, Cowper-Symonds material model was used to predict the HAZ properties.
The mechanical properties of HAZ were successfully predicted using Micro Vickers Hardness test results.
Hall, Recommended Design Fatigue Factors for Reassessment of Piles Subjected to Dynamic Actions From Driving, J.

However, it is difficult to weld because it have lots of factors, which is limited to welding, such as the low melting point, the low evaporation point, the high chemical attraction with oxygen and the generation of metal compound.
Table 1 Chemical composition and mechanical properties of Mg alloys.
This occurs due to the mechanical deformation in TMAZ of FSW.
Table 3 Physical properties of FSWelded Mg Alloys Yield strength (MPa) Tensile strength (MPa) Elongation (%) AZ31B-H24 93 230 10.24 AZ61A-F 123 210 7.6 AZ91C-F 109 166 3.4 Figure 10 shows the fracture appearance of joints.
Because of more Mg17Al12 (β phase) intermetallic compounds, Mg alloy with high Al content showed poor mechanical properties.

In this study, a voronoi model that presents material properties on a micro scale was developed [6].
Different material properties were then assigned to individual tessellation parts.
As the centroid voronoi tessellations had similar shape and size to the grains on the sheets, while different tessellation parts had different mechanical properties, this voronoi model can present the blank on a grain scale.
However, a monotonous decrease of minimum thickness in the annealing temperature of 1050 ℃ indicated that the randomly distributed grain parts with different material properties affected the strain-stress development and finally impacted the minimum thickness.
Moreover, the randomly distributed grain parts with different mechanical properties affect strain-stress development and therefore the thickness of the drawn cups.

Studies have shown that adding CNTs to photocurable polymers used in SLA can significantly alter their mechanical behavior, impacting both impact resistance and fatigue life—key factors in the longevity and performance of prosthetic limbs [1].
The extensive application of CNTs across diverse fields is largely due to their ability to undergo significant mechanical deformations, which affect their electronic, magnetic, optical, and chemical properties [5].
Molecular Dynamic Theory Molecular mechanics theory is basically used to characterize the mechanical properties of SWCNT.
On the estimation of mechanical properties of single-walled carbon nanotubes by using a molecular-mechanics based FE approach.
Atomistic-continuum modeling for mechanical properties of single-walled carbon nanotubes.

Strength and Fatigue Properties of Used Materials.
The second relevant area for fatigue life prediction is a determination of necessary (namely mechanical) properties of used constructional materials in analysed points of system.
Key factors affecting the intensity of fatigue damage cumulation Four principal factors influencing the structure design procedure are as follows: · working loads, · material and its properties, · production and form of the component (detail), · technology and operation .
Properties of Structure Material.
The operating conditions and outside surroundings factors aggressiveness are also tightly connected with the changes of surface layer properties during technical life of a part or detail.

At high temperatures, the material properties are sensitive to a strain rate.
Table3 lists the computational time of various mass scaling factors.
Two factors may cause the deviation of thickness.
Temperature change will probably affect on material properties.
Djavanroodi, “Experimental study of thickness reduction effects on mechanical properties and spinning accuracy of aluminum 7075-O, during flow forming,” Int J Adv Manuf Technol, 2010, doi:10.1007/s00170-010-2782-4 [4] Stefan Hauk, Victor H.

The mechanical properties and wear resistance of the alloy are strongly dependent on chemical composition, properties of lubricants, load carrying capacity, thermal stability and the tendency to the formation of micro-cracks.
The main alloying element is aluminum [3], its addition increases the castability, influences the size reduction of grains and improves the mechanical properties [5].
Copper addition improves the mechanical and tribological properties of the alloy, it also increases the tendency of Zn-Al alloys to spontaneous ageing and causes increase of the density of [3, 5].
Savaskan, Mechanical and tribological properties of Al–40Zn–Cu alloys, Tribol.
Purcek, Effect of copper content on the mechanical and sliding wear properties of monotectoid-based zinc-aluminium-copper alloys, Tribol.

These results suggest that the accumulation of Bi ahead of the Cu6Sn5 layers can affect not only the interfacial reaction barrier but also the local thermodynamics at the interface between the Cu6Sn5 layer and the solder.
The eutectic Sn-3.5Ag alloy is an attractive solder candidate for replacing the conventional Sn-Pb solder due to its excellent mechanical properties.
Bi is considered to be a ternary alloying element for engineering the eutectic Sn-3.5Ag solder with the desired physical and mechanical properties [2].
Bi accumulation ahead of the η sub-layer can affect the growth kinetics of the IMC layer as a result of its influence on the following factors: (1) the interfacial reaction barrier at the η/solder interface, (2) local compositions of the η and solder phases at the η/solder interface, and (3) the diffusivities of Sn and Cu in the solder matrix.
However, this study suggests that, in order to understand the growth behavior of the IMC layer at a low aging temperature such as 130°C, the influence of Bi accumulation on the factors (2) and (3) also needs to be considered.

Introduction Titanium alloy has high strength, high temperature mechanical properties good corrosion resistance and so on.
On titanium alloy processing technology and method research which is attracting much attention [1] .However, due to its certain physical and chemical properties, their machinability is poor.
WEDM technology is a non-contact machining method, high precision machining, not affected by macroscopic force, not limited by the physical properties such as strength, hardness.
The model shows the main factors affect the surface roughness of material in WEDM is electrical parameters.
Pulse current is the biggest influence factors.

Polymeric matrix composite materials presents advantages in a great number of applications due to their high specific strength and stiffness, wear resistance, dimensional stability, low weight and directional properties.
As result of these properties and potentials applications exists a strong need to understand the manufacturing processes, particularly the machining process of these composite materials.
Introduction Polyamide composites are applied in several fields of engineering such as aircraft, automobile, robots and machines due to of their excellent properties [1-4].
The mechanical and thermal properties of both materials are described in Table 1.
Machaly, Factors affecting the machinability of GFR/epoxy composite", Composite structures, Vol. 63 (2004), p. 329-338 [5] X.M.