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In order to improve the mechanical properties and thermal fatigue behavior of 4Cr5MoSiV1 steel, traditional process must be changed.
Uniform microstructure can be obtained after homogenizing and then the mechanical properties and the impact toughness value can be ultimately improved.
Metallographic cross-section of ((a) 4Cr5MoSiV1H (b) 4Cr5MoSiV1samples after 2000 cycles test Several factors influence the mechanical and thermal fatigue properties.
Strength, toughness and hardness of hot work-tool steel can synthetically affect its thermal fatigue behavior.
Mechanical properties of 4Cr5MoSiV1, 8407s steels.Proceedings of ICETS 2000-ISAM, Beijing, P.R.China, October, 2000, 1275～1280

VULNERABILITY of hazard-affected bodies refers to the degree of vulnerability of hazard-affected object subject to the disaster risk impact, which is determined by a series of natural, social, economic and environmental factors and their interaction processes that may affect the sensitivity of the hazard-affected system to the disaster impact.
In accordance with the analysis and research of hazard-affected mechanism, the factors effecting the speed and accumulation thickness within the range of dam-break submerged and buried area comprise the current dam height, the current reservoir capacity and the tailing dam downstream main ditch longitudinal gradient.
As the slope stability of the tailings dam is mainly affected by the physical and mechanical properties of the tailings, thus it is able to use the internal friction angle, cohesion and bulk density for measurement.
The inherent vulnerability of hazard-affected body refers to the availability subject to loss after receiving a certain intensity of impact depended by the physical characteristics of the hazard-affected body, which reflects the capacity to resist hazard-affected factors of the hazard-affected body.
G is the fresh weight over the ground and Mis the mechanical strength of stem

An Effect of Sands of Different Grades on Structural and Mechanical Properties of Sand Concrete Evgenii Borisiuk1,a and Elizaveta Kochenkova1,b* 1Moscow State University of Civil Engineering, Yaroslavskoe shosse 26, Moscow, 129337, Russia aborisyukea@mgsu.ru, b*liza21@list.ru Keywords: Reduced Voidness, Sand Concrete, Fine Concrete, Composite, Sand for Concrete, Fine Sands, Optimization.
The sands, used in concrete mixes, differ significantly in their coarseness of grading, voidness, apparent density and other characteristics, which largely affects the properties of concrete.
At the same time, there is practically no possibility of evaluating the properties of concrete by any one general characteristic of sand.
Cement to cement contacts have high strength, depend on the cement properties and water-cement ratio (W/C). 2.
As the Eq. (11) shows, the thickness of the sand grains coating and the expansion factor have a linear dependence and are determined by the properties of the sand.

Improved Comprehensive Index Method for the Evaluation of Rock Burst Risk in Mining There are mainly geological factors (mining depth, mechanical properties of coal bed, characteristics parameters of the roof rock thickness, tectonic stress concentration and so on) and mining factors (stopping line of upper terrane, mined-out area, coal pillar, mining speed and so on) affecting rock burst in coal mine.
Determining the affecting degree of each factor and linking the comprehensive index with different risk level, the comprehensive index method for the evaluation of rock burst risk is put forward [1].
Here, is the affecting index by geological factors, is the affecting index by mining factors, and the larger one between them will be used in the evaluation of rock burst risk as the comprehensive index
(9) Here, is the practical risk index of each factor, is the maximum risk index, is the number of geological factors, is the number of mining factors.
The description of the factors and corresponding risk index are seen in the literature [1].

However, improvement of mechanical properties is a constant in research activities, either by the development of new alloys or by microstructure manipulation.
Eutectic Si modification is crucial to achieve high mechanical properties, and is considered much more important than grain refinement itself [5].
Basavakumar et al., Influence of grain refinement and modification on microstructure and mechanical properties of Al-7Si and Al-7Si-2.5Cu cast alloys.
García-Hinojosa et al., Structure and properties of Al-7Si-Ni and Al-7Si-Cu cast alloys non-modified and modified with Sr.
Puga et al., Influence of Ultrasonic Melt Treatment on Microstructure and Mechanical Properties of AlSi9Cu3 alloy.

Microstructure and mechanical properties of Mo2FeB2 based cermets containing SiC whisker Haizhou Yu1, a, Wenjun Liu1, b, Lian Ying1, c, Min You1, d 1College of Mechanical and Materials Engineering, China Three Gorges University, Yichang 443002, P.
China ayu_haizhou@yahoo.cn, blwjonly1588@sina.com, cjianxiayl@sina.com, dyoumin@ctgu.edu.cn Key words: Mo2FeB2 based cermets, SiC whisker addition, Microstructure, Mechanical properties Abstract: Four series of cermets with the SiC whisker content between 0 and 1.0 wt.% were prepared by vacuum sintering.
At present, Mo2FeB2 based cermets are attracting much attention because of cheap raw material, simple preparation method and superior mechanical properties[3-4].
The effect of SiC whisker additoin on the microstructure and mechanical properties of Mo2FeB2 based cermets was studied.` Experimental procedure Commercially available Mo (4 µm), carbonyl Fe (3.5 µm), FeB (45 µm), Cr (45 µm), Ni (3 µm), C (5.5 µm) and SiC whisker powders were used as raw materials.
Thereby, it was reasonable to suggest that there were other factors that were responsible for the grain refinement in the present study.

These experiments will allow evaluating of the dependency of the fatigue notch factors on rivet hole expansion.
The fatigue properties of riveted joints are the resultant effect of an integrated impact of many factors related to not only the external load, but also structural and technological parameters of the joint.
The mechanical properties of the 2024-T3 sheet material were measured and average results of six tensile tests parallel/perpendicular to rolling direction were: S0.2= 329/302 MPa, SU = 459/445 MPa, elongation to failure 19%/21%, Young modulus E=68.2/68.5 GPa, Poisson ratio n=0.33/0.34.
Design, Analysis and Properties, Vol. 189, Series: Solid Mechanics and Its Applications.
Pilkey, Peterson's Stress Concentration Factors, John Wiley & Sons, Hobeken, 2007.

The results show that the mechanical properties of the surface with 20% MSZ rate are relatively superior.
Introduction The study of materials surface/interface mechanical properties is an important direction of solid mechanics in 21st century [1].
The main factors, which affect materials surface mechanical property under contact loads are 㧦 applied load magnitude, profiles of contact pairs, friction coefficients, etc.
Conclusion The wear properties of the materials are different for varying MSZ rates and surface contour.
The numerical simulation results show that the wear properties are not proportional to MSZ rate, and the wear properties will be better while the MSZ rate of materials nearly equal to 20%.

Among the material parameters, mechanical and physical properties at various temperatures and the type of filler-metal are important parameters.
Material properties SS304 is austenitic Cr-Ni stainless steel.
Table.2 Temperature-dependent material properties of SS304 Temp
Temperature dependant material properties of SS304 are shown in table.2 and temperature dependent material properties of colmonoy is shown in table 3.
Instead, it deactivates them by multiplying their stiffness (or conductivity, or other analogous quantity) by a severe reduction factor .This factor is set to 1.0E-6 by default, but can be given other values.

Amorphous Copper-Based Alloys: Structure, Technology and Properties A.G.
The present work describes the analysis of the physical properties of liquid amorphous solder, conducted heat treatment of the melt and the study of the samples mechanical properties in the solid state.
Therefore, in liquid alloys of the same composition, in the same conditions, the short-range order parameters, the nature of inter-particle interactions and the distribution of elements vary affecting the behavior of such processes as diffusion, a crystallization, etc. [12].
Each of the used alloying elements confers specific properties to the alloys.
The above-mentioned factors favorably affect the process of amorphization and the quality of the spare surface of the ribbon.