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Introduction Hardness is one of the most widely used and promising characteristics which allows assessing the mechanical and operation properties of metallic materials and structures.
The impact of some factors on hardness tests results has been studied in detail.
At the same time, the issue of the relationship between residual stresses and hardness values remains highly relevant, especially when studying the mechanical properties of welded joints.
Peshek, Determination of Mechanical Properties of Materials by Micro Indentation: Modern Techniques, Moscow State University, Moscow, 2004
Borodavkina, Effect of electron-beam welding speed on weld metal mechanical properties of 5V titanium alloy, IOP Conference Series: Materials Science and Engineering. 969 (2020) 012095

Combinations of these factors affect wear morphologies.
On the other hand, when steel plates are used for construction machines or mechanical tools, formability is a very important material property for fabrication and safety in operation.
Regarding the effect of material factor on wear, it was reported that wear resistant properties are further improved by controlling secondary phase even with the same hardness in certain wear environment.
That is to say, not only hardness of matrix but also forms of secondary phases is influential on wear resistant properties.
Carbon content of the steels varies from 0.14% to 0.40% (No.1C~4C) to clarify the effect of hardness of matrix on the wear properties.

The wear of the hip joint is considered as one of the main factors that affect the long term performance of the implant.
The hip joint polymeric cup is usually made of UHMWPE due to its good mechanical properties and excellent biocompatibility [8-13].
Among them, loosening due to wear of polymeric cup has been one of the main factors that affect the long-term stability of the total hip arthroplasty.
Therefore, several attempts have been made to improve the wear properties of the polymeric cup with the aim of improving the long term performance of the total hip joint prostheses [4, 7-9].
Past theoretical work focused upon that the femoral head diameter, material and ball/cup clearance were identified as the most important factors influencing the resultant contact pressure on the hip joint cup [21-24].

However, more studies on behavior of concrete reinforced with fibers are needed because many factors affect on mechanical properties of fibers.
Conclusions Following conclusions can be obtained from the present experimental work on effects of steel fiber volume on mechanical properties of SFRC.
Shi: Correlations among mechanical properties of steel fiber reinforced concrete, submitted to Journal of Construction and Building Materials.
Meda: Relationships between Fiber Distribution, Workability and the Mechanical Properties of SFRC Applied to Precast Roof Elements, submitted to Journal of Materials and Structures.
Ari: Effects of Steel Fiber Addition on Mechanical Properties of Concrete and RC beams, submitted to Journal of Construction and Building Materials.

The Property Comparison of Coating Prepared by Oxygen-acetylene Spray Welding Technology and High-frequency Induction Remelting Technology Junfeng Zhu1,a, Weifeng Xiao2,b, Gang Liu2,c and Shulin Wang1,d 1School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, China 2Shanghai Tool Works Co.
Through investigating coating surface, interface of coating, microhardness and wear resistance of coating on thin plane material, we can further make sure which technology is more suitable for the coating manufacturing and find out external factors having bad effect on coating quality.
In order to avoid being affected by external factors, spraying coating should be heated by high-frequency induction heating machine instantly.
Self-fluxed alloy powder plays a significant role in mechanical remanufacturing area.
Its chemical composition and property parameters are shown in Table 1, which is an important factor to make us choose appropriate self-fluxed alloy powder to meet different needs successfully.

The influence of the four factors biomass particle size, moisture, pressure and compression speed to formation density and compressive strength was summarized, by orthogonal test method.
The unique properties of biomass materials are used to squelch Biomass briquettes [3].
According to orthogonal experiments, the four factors influence to the formation density and compressive strength were summarized, which were reference to the biomass-related equipment industry.
In this paper, we use orthogonal experiment 4 factors and 4 levels, Orthogonal Latin square table (L16(45))[8].
Analysis of biomass density As shown in table 3, RA>RB>RD>RC, the affect of factors to biomass density prioritize is A>B>D>C, that is the biomass size is the largest influence factor.

Influence of a Trace Alloying of Ag on the Ageing Behavior and Mechanical Properties of AZ80M Magnesium Alloys Weibing Suna and Cuming Liub* School of Materials Science and Engineering, Central South University, Changsha 410083, China a765839088@qq.com , bcmliu803@sina.com Keywords: AZ80 magnesium alloy, Ageing, Ag, Mechanical property.
The tensile mechanical properties of the alloys at different state are presented in Fig. 9.
Fig. 9(d) presents the tensile properties tested at 423K for alloys aged at 473K, Ag-containing alloys have better properties at elevated temperature as well.
(a) AZ80; (b) AZ80+0.5Q Fig. 9 Tensile mechanical properties of the alloys at different state.
Another crucial factor associated with the type of b-Mg17Al12 precipitates is ageing temperature.

Unlike quality, properties can be quantified.
Management of physical and mechanical properties, such as strength, moisture, frost resistance, moisture shrinkage.
The results of the research on the effect of air content showed that, despite the fact that the foam of the same quality was introduced, the size and frequency of air voids and, therefore, the coefficient of spacing in foam concrete, varied depending on the different air content, which, in turn, affected on the mechanical properties of concrete.
Alexanderson, Relations between structure and mechanical properties of autoclaved aerated concrete.
Lim, Air-void system of foamed concrete and its effect on mechanical properties.

Dynamic mechanical, thermal and tensile properties are also studied.
The physical properties, such as thermal degradation, dynamic mechanical and tensile properties are also analyzed.
It was reported by other authors that the changes of the dynamic mechanical properties, such as storage modulus (Eʹ), loss modulus (Eʺ) and loss factor (tanδ) were varied with the increasing of the temperature and frequency [13-21].
Huang, Research on the dynamic mechanical properties of polyureas based on polyaspartic esters, Journal of Wuhan University of Technology. 29(4) (2007) 61-63
Oprea, Effect of polyols on the physico-mechanical properties of some polyurethanes, Journal of Optoelectronics and Advanced Materials. 9(4) (2007) 994-999

Stiffness is one important index of sandwich plate mechanical property.
Material property obtained through tensile test.
So offset of the weld as influencing factors of sandwich plate overall stiffness to analysis as well.
(2)Among the factors weld width,root gap and weld offset, the change of weld width influence the sandwich plate overall structure stiffness mostly.
[7] Lok，T.S., Cheng, Q.H., Elastic Stiffness Properties and Behavior of Truss-Core Sandwich Panel [J].Journal of Structural Engineering, 22(2000)126:552-559