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The friction stir welding tool is a crucial part of this welding operation accordingly, mechanical properties and microstructural characteristics of the FSW welded materials can be affected by various factors such as welding conditions, material composition, microstructures of the before and after welding, and various geometric parameters of the friction stir welded tool and the substrates [27, 28].
Mechanical Properties.
The joints are heat treated at different conditions to enhance the mechanical properties of the joints.
It has been reported that heat input generation in the welds by the tool shoulder is an important factor in FSW process, and also, the properties of the joints are strongly influenced by this factor.
Lei, Mechanical properties of underwater friction stir welded 2219 aluminum alloy, Trans.

Analysis and measurement showed that the quantity of inclusions was decreased and the mechanical properties were improved.
Inclusions not only affect the properties of magnesium alloy, but also cause the loss of molten magnesium.
By analyzing and testing the change of inclusion in type, quantity, size and mechanical properties, the factors affecting mechanical properties were discussed, which would set the foundation for further enhancing the mechanical properties of magnesium alloy. 2 Experimental Mg, Al, Zn, Mn and a little amount of La were used as raw materials in experiment.
The average crystal grain area of AZ91, 3575µm2 [7] was bigger than that of the sample, 875µm2, which was decreased by 76%. 3.4 Mechanical properties The tensile properties of the sample were shown in Table 2.
It can be expected that the better mechanical properties of sample would have been attained, if rear earth was added in the AZ91 and the raw materials of high purity were used in the experiment. 5.

Several factors may contribute to the formations of residual stress and deformation.
However, the formulation considered the contributions of the transient temperature field to the stress analysis through thermal expansion, as well as temperature- dependent thermo-physical and mechanical properties.
The thermal analysis was performed using temperature dependent thermal material properties.
Table. 1 Properties of the steel substrate and stellite 6 material.
Fig. 5, Temperature-dependent mechanical-physical properties.

Effect of Poling on the Mechanical Properties of ββββ-poly(Vinylidene Fluoride) C.M.
The differences observed between the two materials suggest that the poling affects the mechanical properties of the material especially in the direction parallel to the polymeric chains and originates changes at a molecular level that remain beyond the melting of the material.
An important issue is the dependence of those properties on the structure of PVDF.
The Young´s modulus at constant polarization obtained from equation 2 for unpoled PVDF, is 0.9GPa ± 0.1 GPa and for poled PVDF is 1.3GPa ± 0.1 GPa, i.e the poling process affects the mechanical properties of the material along the chain direction.
As a result, the Young modulus of the material along the polymeric chains increases but does not especially affect the mechanical properties in the transversal direction, i.e. poling mainly affects the intrachain coupling.

The factors that are affecting the property of natural cellulose fiber in fiber-reinforced concrete [3].
The applicability of dispersed fiber in concrete production as a building material improves its entire mechanical properties in concrete [5].
Due to two main factors: Cost and availability, natural fiber-based eco composite materials are more suitable for use than biodegradable polymer materials.
Thus, the corresponding composites provide good mechanical properties.
Kumar, “Study of Mechanical Properties of Bamboo fibers before and after Alkali Treatment,” vol. 13, no. 7, pp.5251-5255, 2018

The presented paper deals with the experimental assessment of the impact of increase pressure on the mechanical properties and homogeneity of a die cast.
The castings cast under pressure during solidification are characterized by better mechanical properties and by increased airtightness.
Influence of increase pressure upon the values of mechanical properties Influence of increase pressure changes on mechanical properties study was performed on experimental samples (Fig. 4 - alternator flange castings) and (Fig. 5 - testing bar taken from the gating system appointed for static tensile test).
When the experiment has been carried out constant and variable technological factors have been determined and the impact of these factors on the values of mechanical properties has been observed: Constant technological factors: plunger pressing speed: 2.6 m.s-1, liquid alloy temperature: 705°C, mold temperature: 200°C, pressing chamber diameter: 70 mm and Variable technological factors: increased pressure: 13; 22 and 25 MPa.
Pasko, Influence of technological factors of die casting on mechanical properties of castings from silumin, Lecture Notes in Electrical Engineering 240 (2013) 713-722

In the above influence factors, concrete strength and steel plate hole size mainly affect the mechanical properties of PBL Shear Connectors in normal use stage.
Perforated rebar’s strength and diameter mainly affect the mechanical properties of PBL Shear Connectors in ultimate bearing capacity stage.
Contrasting test results, we may safely draw the conclusion that the influencing factors of PBL Shear Connectors’ mechanical properties including (but not limited to) the following factors
(1) Mechanical properties of PBL Shear Connectors are influenced by those factors, such as strength of materials, size of members, specimen structure and so on.
Research on the Static Load Mechanical Properties of PBL Shear Connectors’ Push-out Test[J].

The plasticity correction factors are analyzed using a calculation strategy based on the comparison between linear elastic and elastoplastic analyses.
This motivates the establishment of the calculation strategy of Ke factors of new material, which is the foundation of the fatigue analysis of titanium alloy materials.
(3) Based on the physical and mechanical properties of titanium alloy TA17, the influence factors, , is obtained by the elastic and elastic-plastic analysis of titanium alloy; (4) Based on the conclusion of verification calculations of austenitic stainless steel, the correlation coefficients A, B, C and m, n in formula (3) and (4) of TA17 are determined. 2.3 The main factors affecting Ke Several different effects can cause elastic-plastic strains in a component, the main factors to be considered in the impact Ke are: (1) Load mode: two control modes, stress control and displacement control, are discussed
The influence of uniaxial tensile behavior on the elastic plasticity correction factor is considered by selecting material properties under 30 ℃ and 350℃.
The results of these verifiction calculations are provided under different combinations of four influencing factors, (mechanical/thermal/both mechanical and thermal loadings), multi linear elastic-plastic material model and chaboche material model, temperature 30 ℃ and 350℃, load controlled and displacement controlled loads, to analysis by elastic-plastic finite element method and simplified elastoplastic analysis to get the and respectively.

Weld pool geometry is one of the key factor to decide the mechanical properties of the welded joints.
The metallurgical properties of the welds were also characterized and described in detail and correlated with the mechanical properties of the GTAW welded joints.
Final equation in terms of coded factors: Fusion Zone=2.13-0.14*A-0.1*B+0.038*C+0.05*AB-0.025*AC+0.2*BC, the final equation is written in terms of actual factors: Fusion Zone =9.00441-0.010833*welding Figure 1.
Sivaprasad, Evaluation of microstructures and mechanical properties of dissimilar materials by friction welding, Procedia.
Che, Improving mechanical properties of dissimilar material friction welds, Appl.

Study on the microstructure control and the variation of mechanical properties of pearlitic steel Lunyou Li1,a, Yu Liang2,b*, Zemin Wei2,c, Hu Xiong2,d, 1Guizhou Wire Rope Incorporated Company, Zunyi, 563000, China; 2 School of Materials and Metallurgy, Guizhou University, Guiyang, 550003, China a13708525662@163.com, bxq.liangyu@126.com, c346602059@qq.com, d1146532648@qq.com Key words: pearlitic steel; microstructure; mechanical properties Abstract:The effect of austenitizing temperatures and isothermal transformation temperatures on microstructure size and mechanical properties of 70 steel was studied.
Grain size/µm Colony size/µm Interlamellar spacing/nm 1 41.55 7.63 173 3 40.36 6.36 150 4 25.46 5.45 152 6 24.38 5.07 144 According to the changing trends of the mechanical properties, the samples, which austenitizing at 1000 ˚{TTP}730 C, has coarser grain, and the comprehensive mechanical properties is lower than the one austenitizing at 860 ˚{TTP}730 C generally.
With the decrease of isothermal temperature, the mechanical property is increasing.
Fig.3 Mechanical properties.
Mechanical properties of samples 1, 2 and 3, which have a coarser grain size, show that grain size is the main reason affecting the tensile properties.