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Gopalakannan, et.al. [3] Carried out optimization of EDM process on MMC and performed an ANOVA and RSM model concluding that the pulse current was the most important factor affecting the MRR.
Karabulut [16] carried out study on Optimization of surface roughness and cutting force during AA7039/Al2O3 MMC milling using Neural Networks and Taguchi method and found that the material structure was the most effective factor on surface roughness and feed rate was the dominant factor affecting cutting force.
Rajmohan, et.al [23] evaluated mechanical and wear properties of hybrid aluminium matrix with aid of ANOVA.
The Pulse current, Voltage and Pulse on time are primary factors that affect the quality of Aluminium hybrid metal matrix composite, while Pulse off time is considered as secondary factor.
Ranganathan, Evaluation of mechanical and wear properties of hybrid aluminium matrix composites, Trans.

Its various physical and chemical properties was analysis, whose chemical composition was shown in Table 1.
Therefore, in this experiment, iron tailings were pretreated by a physical treatment, chemical excitation and combination of both, in order to enhance the capacity of tailings iron in response and improve the mechanical properties of products.
Discussing the main factors on affecting the compressive strength of inorganic polymers, such as tailings mass fraction of total solid phase, doped volume of liquid sodium silicate, solid-liquid ratio, curing period and cement content of slag.
However the strength of product would be lower, because if the curing time was too long, the product would have a gradual process of dissociation with the effect of external factors.
Conclusion In the other conditions unchanged, some important factors was discussed, which affected the compressive strength of geopolymer materials.

A Study on Ductility of Lightweight Aggregate Concrete Shear Wall Weichao Chen1,2, a, Weijun Yang1, b, Yao Li1,c 1Changsha University of Science and Technology, Hunan Changsha 410076, China 2Hunan Construction Engineering Group Corporation, Hunan Changsha 410004, China awlrwc@163.com, bmgbyrh@163.com, c370324236@qq.com Key words: lightweight aggregate concrete, shear wall, ductility Abstract: Based on the properties of lightweight aggregate concrete, the yield curvature and the ultimate curvature are calculated by numerical method, and the relationship between curvature ductility ratio and displacement ductility ratios is established for lightweight aggregate concrete shear wall.
The major influencing factors for ductility of lightweight aggregate concrete shear wall include with or without constrain edge conponent, the characteristic value of stirrup of constrain edge conponent, the axial compression ratio and the height-width ratio and so on.
Introduction Although many experimental researches were conducted of seismic behavior on light weight concrete shear wall in recent years, the researches for the ductility design, the factors and the calculation method of ductility of light weight concrete shear wall were rarely reported.
(2) There are many factors can affecting the displacement ductility of light weight aggregate concrete shear wall,but the only effective way is to limit axial compression ratio and set constraint edge conponent
(3) According to the numerical calculate method on displacement ductility ratio of light weight aggregate concrete shear wall and the affecting factors, and the requirements of the code for seismic design of buildings, the limit value for the axial compressive ratio and the haracteristic value for hoop of constraint edge component of light weight aggregate concrete shear wall still need further research.

Microstructure, Densification and Mechanical Properties of TiB2-TiC-NiAl Ceramic-Based Composite Weiguo Wang, Lei Zhang and Xiaoliang Zhang Science Research Department, Mechanical Engineering College, Shijiazhuang, China Wangweiguo2015@aliyun.com Keywords: TiB2-TiC composite; densification; microstructure homogeneity; composite additive Abstract.
Recently, Zhao et al [2] introduces combustion synthesis into high gravity field to induce thermal explosion reaction, successfully prepared near-full-density TiC-TiB2 composites with fine-grain even ultra-grain microstructures by liquid forming and rapid solidification, and the selection of the additives was considered to one of key factors affecting the microstructures and properties of solidified TiC-TiB2 composites.
Hence, by introducing Ni-Al composite additive into the primary system of Ti-B4C and changing its mass fraction, a series of TiC-TiB2 composites are prepared by combustion synthesis in high gravity field, and effects of the composite additive on densification, microstructure and mechanical properties are discussed.
Summary By introducing and increasing Ni-Al composite additive in Ti-B4C primary system, a series of TiB2-based ceramic composites were prepared by combustion synthesis in high gravity field, and effects of Ni-Al composite additive on microstructure, densification and mechanical properties were discussed.
Chrysanthou, TiC-TiB2 composites: A review of phase relationships, processing and properties, J.

However, when the samples were used at higher temperatures (>800˚C), the volume shrinkage increased sharply, which directly led to a serious deformation and then affected thermal insulating properties in applications.
An ultrafine ceramic fiber named E-glass was used to improve mechanical properties of the composites with average diameter about 7 μm and length 5 mm.
However, when sample 1 is treated at higher temperatures than 800˚C, the volume shrinkage begins to increase sharply, which directly leads to a serious deformation and then affects mechanical properties.
Based on the principle of heat conduction in solids, the reduction of porosity means a drop in thermal insulating property for porous materials.
For this phase transformation, temperature is considered as one of the major factors.

Generally, cracks are initiated in cementitious materials at the nanoscale [3], then grow into micro and macro cracks that negatively affect the mechanical and durability properties.
Besides the CNTs' physical properties' effect on the mechanical properties, some other essential factors and interactions must be studied.
Flow properties Flow properties like flow diameter, yield stress, and plastic viscosity indicate the cementitious composite's stability, constructability, and early-age characteristics, which affect the mechanical properties.
CNTs have mechanical, electrical, and thermal properties.
These cracks affect the durability and mechanical properties.

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.

Failure mode of the main environmental factors of the detection and control unit were analyzed, then the main synthesis stress which may affect the unit were ensured, so that the unit’s potential weak link as the main concern of the RET can be identified.
Not until all specimens are failed, will the test be stopped. 2.3.1 High temperature effect analysis High temperatures may temporarily or permanently impair the performance of materiel by changing physical properties or dimensions of the unit.
Exposure of materiel to low temperatures may either temporarily or permanently impair the operation of the materiel by changing the physical properties of the material of which it is composed.
Sudden temperature changes may either temporarily or permanently affect operation of materiel.
Temperature circling test stress shown in Fig7. 3.3 Step-Vibration test Vibration tests is performed to develop materiel to function in and withstand the vibration exposures of a life cycle including synergistic effects of other environmental factors, materiel duty cycle, and maintenance.

However, the specific combination of material (A240-304L stainless steel), operating conditions and environmental factors in this case present a complex challenge.
Mechanical Testing is a type of testing that measures the mechanical properties of a material [6].
The results of a mechanical test can be used to determine a material's strength, ductility, hardness, and other important properties.
Table 2 shows the results of the mechanical properties measurement of plate shell material consisting of tensile test, hardness test, and impact test are in accordance with ASTM A240-340L [8].
[13] API RP 571 3rd Ed.: Damage Mechanisms Affecting Fixed Equipment in the Refining Industry, API Publishing Services (2020)

Degradation of the Building Structures Due to Carbonation of Concrete Jan Pasek1,a*, Ludek Vejvara1,b 1 University of West Bohemia, Faculty of Applied Sciences, Department of Mechanics, Univerzitni 8, 306 14 Pilsen, Czech Republic apasek@kme.zcu.cz, bvejvara@kme.zcu.cz Keywords: Concrete structures, carbonation of concrete, corrosion of reinforcement, influence of concrete properties, influence of environment properties, influence of age of structure, durability and reliability of reinforced concrete structures.
The paper refers about seriousness of the current technical state of reinforced concrete structures and influence of the most important factors on the course of their degradation caused by carbonation and specifies principles for designing new reinforced concrete constructions.
Analyses of the factors influencing process of carbonation of concrete Carbonation of concrete affects all monolithic and prefabricated concrete and reinforced concrete elements exposed to influence of carbon dioxide and humidity.
An analyses made on circa 50 buildings in the CR was focused on evaluation of the influence of above mentioned factors on the process of carbonation.
The most significant inhibitor of carbonation seems to be the quality of the concrete described by two factors – the class of the concrete and its structure.