Search results

Through the structure instability theory analysis of the coal roadway roof ,the author concluded that mechanical properties of rock, location, thickness and thickness ratio is the main factor affecting the instability and failure of rock structure.
Introduction According to the theory of the bolt support design, the roof lithologic characteristic and rock structure are the main factors influencing the bolt support design and supporting effect.
The bolt is under the tensile and shear affect and its reaction took control of the abscission layer of rock and the shear rupture.
Accordingly, the instability failure of the rock structure has close relationship with mechanics properties, location of the layer and formation thickness and thickness ratio, especially when the tunnel span is certain, stable thickness of strata in roof plays a decisive role.
The drilling rock damage theory points out that the instantaneous information of the anchor rod drilling machine can reflect the drilling rock physical and mechanical characteristics such as density, strength and hardness.

Cutting speed is the most crucial determining factor compared to other factors.
The most significant element affecting surface roughness appears to be the feed rate Krolczyk and Legutko [8].
The feed rate is the most critical factor affecting machining characteristics Kumar and Misra [27].
This study acknowledges the prediction of machining time and the factors affecting the hard turning of 2205 - Duplex stainless steel.
The Genetic Algorithm in MATLAB was used to predict machining time and find the most influential cutting parameters affecting turning operation.

However, in both the spline function and the Mean & Difference method, only the tensile properties of the given membrane materials could be fit very well.
There are a lot of factors affecting the deformation mechanism of the materials when loading under uni- or bi-axial tensile condition.
The factors are as follows: the structure of the woven basic fabric, the tensile properties of the yarns and the coating material, the thickness of the coating, the interaction (such as slipping and crushing) between the basic fabric and the coating material, the crimp interchange of the warp and the fill yarns[1, 12], etc.
The method could provide a rough understanding of the tensile properties of the membrane materials in the applications.
By this kind of method, it could be expected for the design of the tensile properties of the woven membrane materials.

China ataoxin@tju.edu.cn; bjcliutju@tju.edu.cn; cdrmingcw@gmail.com; Keywords: Magnesium phosphate cement; Heat-treatment; Microstructure; Mechanical properties Abstract.
Wu, Factors influencing properties of phosphate cement-based binder for rapid repair of concrete, Cem.
Bowles, et al., Antimicrobial properties and dentin bonding strength of magnesium phosphate cements, Acta Biomate. 9 (2013) 8384-8393
Li, Influence of magnesia-to-phosphate molar ratio on microstructures, mechanical properties and thermal conductivity of magnesium potassium phosphate cement paste with large water-to-solid ratio, Cem.
El-Jazairi, The effect of retarders on the microstructure and mechanical properties of magnesia–phosphate cement mortar, Cem.

Sintering Effect on Mechanical Properties of Enamel Derived and Synthetic Hydroxyapatite-Zirconia Composites Y.
Unfortunately, mechanical properties of pure HA ceramics are poor.
A suitable method of improving its mechanical properties is based on the synthesis of composites made of HA and other ceramics powders, metal particles or polymers [8].
The objective of this study is to improve the mechanical properties of HA-Zr composites and to verify the influence of some parameters, such as the content of the Zr phase added, and the sintering temperature, on the final densities, compressive strength and microhardness of the composites.
But for factor of Zr content, only Synthetic HA-Zr compacts were affected significantly (Enamel HA-Zr: Fratio of Zr=4.439; p-value=0.051; Syn.HA-Zr: FRatio of Zr=25.130 p-value=0.000).

The properties and precipitation rules of secondary phases generated during isothermal aging of duplex stainless steels and factors affecting the precipitates were reviewed in this article.
The considerable reduction of mechanical properties and corrosion resistance of DSS would be detected because of these phases.
In this article, considering secondary phases’ influence to macroscopic properties of DSS, the properties and precipitation rules of secondary phases generated during isothermal aging of duplex stainless steels and factors affecting the precipitates were reviewed.
Renton, Effect of ageing on phase evolution and mechanical properties of a high tungsten super-duplex stainless steel, Materials Science and Engineering A. 535 (2012) 281-289
Ghosh, Effect of 475 ◦C embrittlement on the mechanical properties of duplex stainless steel, Materials Science and Engineering A 508 (2009) 1-14.

The treatment was used in order to improve mechanical and fatigue properties of the steel.
The S355J2 steel characterizes of good welding properties.
Mechanical properties of the steel.
Such behaviour of steel components with surfaces strengthened by means of friction treatment results from the effects of several factors.
Obtained research results indicate an insignificant improvement of mechanical properties of the strengthened steel under the conditions of corrosion at constant load.

Accordingly, it would result in many vertical joints and differences in mechanical response and deformation properties for vertical and transverse.
Its special structure directly affects the mechanical characteristics and engineering properties, particularly in terms of water sensitivity [5].
Deng [11] deemed that the structure of loess is key factors to control the strength.
To investigate the directivity effects on the mechanical properties of the loess, Y.F.
The mechanical properties of all samples are identical.

Similar trends of v and w affecting r were found for SLM of Al-10Si-0.3Mg alloy by Aboulkhair et al. [2].
Summary Llaser power P during selective laser melting (SLM) has a strong effect on track profile which is the primary factor affecting the amount of lack of fusion (LOF).
Zeng, Effect of energy input on formability, microstructure and mechanical properties of selective laser melted AZ91D magnesium alloy, Mat.
Attallah, Selective laser melting of AlSi10Mg alloy: process optimization and mechanical properties development, Mat. & Des. 65 (2015) 417-424
Attallah, Selective laser melting of Invar 36: microstructure and properties, Acta Materialia 103 (2016) 382-395

Experimental Research on Tensile-shear Behavior of Spot-welded Lap Joints of Ultra-high Strength Steel Yuehua Liu1,a, Huiping Yu2,b, Weiwei Wang3,c, Xiaoyang Li4,d, Shujun Chen5,e 1, 2, 3, 4, 5 College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China aliuyuehua@emails.bjut.edu.cn, byuhuiping@bjut.edu.cn, cwwwaptx@emails.bjut.edu.cn dlixy@bjut.edu.cn, esjchen@bjut.edu.cn Keywords: Ultra-high strength steel (UHSS), Spot-welded, Mechanical properties Abstract.
Numerical simulation based on some assumptions is the common method to research mechanical properties of spot welding joints under tensile-shear load, Baohua Chang [3] has established a computational model that consists of nugget, HAZ and base metal for the single point spot welded lap joints, and the whole stress distribution in the joints is obtained, the results show that high stress concentration around the spot weld edge may be the determinable factor for initializing and propagating of the high cycle fatigue crack.
Xingxing Xie [4, 5] adopts the local stress analysis method to study the nonlinear mechanical properties of the welded spots in a tensile-shear spot-welding lap structure, the nonlinear finite element model is established under the condition of elastic-plasticity, to analyze the strain-stress distribution rules under various loads, the conclusion indicates that the shear stresses should be the main criterion for the safety evaluation on the spot-welded structures.
Conclusions By means of experiment, including tensile-shear testing, hardness testing and morphology observation, this paper makes a research on the mechanical properties of spot welding structure of ultra-strength steel, conclusions are drawn as follows: (1) The results of Vickers hardness testing indicate that the maximum hardness of the structure is located at weld nugget, and the minimum hardness appears in heat affected zone.
Dong: Journal of Mechanical Strength, Vol. 20 (1998) No.4, P.271.