Search results

Tunnel surrounding rock under high stress based on the actual engineering background, model test process of excavation in soft rock tunnels under the distribution factors was finished in triaxial test mechine.
When weak surrounding rock geological structure is appeared in practical engineering, the randomness of spatial distribution of mudstone interlayer thickness and the mechanical strength low could cause the construction weaken and affect the instability of long term stability.
Deformation and buckling of engineering are not instantaneous, and have the obvious creep property.
Soft rock thickness influence the stress curve Various factors were taken into consideration during the test, it could be seen that the stress of each measuring point changing with the excavation progress forward.
Through the small scale model test of cavern excavation the sensitive factors of stability, there are initial stress field in rock mass before the cavern excavation.

Through analyzing the main factors of the air material suppliers, this paper constructs an assessment index system of the air material suppliers.
This article is based on the objective analysis on the basis of the factors influencing the material supplier quality assurance ability which is combined with the actual situation of the air transport enterprises, according to the air quality standard requirements.
The basic principle of fuzzy comprehensive assessment method is first to determine the assessment factors’ grade standard and the corresponding assessment index weights, and then determine the membership degree of assessment indexes which is used to describe the assessment factors of fuzzy boundaries, so as to construct the assessment index fuzzy assessment matrix, then use the weighted average fuzzy composite operation to ensure the level of the assessment objects [7].
According to the principle of maximum membership degree, it can be seen that the Air Materiel supplier assessment factors in aviation materials quality indicators and corporate reputation index assessment rating scale is relatively low.
Bai: Journal of Mechanical Science and Technology, Vol.25 (2006), p.1404-1407.

Multi-body Dynamics Model of Crankshaft System During the work process of the crankshaft system, the compliances of the crankshaft has an impact on the other components, thereby, the force state of the crankshaft will be affected.
The solid model of the crankshaft is imported into ANSYS software, and the unit type and the mass property are set properly.
So the dynamic enhancement factor λd and dynamic load factor c are introduced for correcting nσ
Journal of Mechanical Engineering. 46 (2010) 86-91
Journal of Mechanical Engineering. 47 (2011) 40-58．

Some factors such as conversion, particle number (Np), fraction of coverage, polydispersion index (PDI) and particle size distribution (PSD) of the reactions were investigated.
According to the different features of different nucleation methods, the nucleation mode of polymer particles can be deduced by comparing some factors such as conversion, Np, coverage fraction (θ), PDI and PSD, etc.
Results and discussion Reaction compositions and latex properties.
The compositions and product properties are listed in Table 1.
Synthetic properties and applications of polymer emulsions.

Such changes in the properties indicate the change of the electronic structure of the atoms of the alloy composition elements.
Most investigations of the processes of the hydrogen interaction with amorphous alloys are focused on alloy bulk properties.
At the ion bombardment of the multicomponent alloy, the phases with stronger interatomic bonds and smaller etch factors form protruding irregularities.
Skryabina, Effect of hydrogen on the properties of amorphous alloys “finemet” type: PEN-X effect.
Pavlova, Interaction of the surface of ribbons of amorphous soft-magnetic iron-based alloys with water and their magnetic properties, Phys.

Welded joints must ensure suitable operational properties, mainly in terms of creep, so that the repaired casting can work under the same conditions as the correct cast.
An important factor determining the plausibility of the application of welding techniques for repairing or joining cast magnesium alloys is the structural stability and the stability of the properties of the joint in operating conditions, that should be similar to the properties of the native material [3,4].
Chemical composition and properties of the QE22 alloy Chemical composition of QE22 alloy [% mas.]
Consequently in the process of development of gaps and micricracks on the grain boundaries they form the main crack · after the process of welding of the casts of QE22 alloy, thermal treatment should be performed (supersaturation and ageing, T6) in order to solve the eutectic areas and improve and homogenize the mechanical properties of the entire cast.
Kiełbus, Structure and mechanical properties of casting MSR – B magnesium alloy, Journal of AMME, 18/1–2 (2006) 131-134

Microstructure, Surface Characterization and Fatigue Assessment of 56SiCr7 Spring Steel Roselita Fragoudakis1, a, Fani Stergioudi2, b, Nikolaos Michailidis2, c and Georgios Savaidis3, d 1Tufts University, Department of Mechanical Engineering, USA 2Aristotle University of Thessaloniki, Department of Mechanical Engineering, Physical Metallurgy Laboratory, Greece 3Aristotle University of Thessaloniki, Department of Mechanical Engineering, Laboratory of Machine Elements & Machine Design, Greece aroselita.fragoudakis@tufts.edu, bfstergio@auth.gr, cnmichail@eng.auth.gr, dgsavaidis@meng.auth.gr Keywords: Heat Treatment, Shot-peening, Tempering, Spring Steel, Microstructure, Surface Hardness, Fatigue Life.
Introduction The degradation of the properties of a component subjected to cyclic loading is demonstrated first through changes in the microstructure of the component (nucleation of defects), followed by initiation and propagation of cracks.
The microstructure of the component is one of the primary factors that affect its fatigue life, which is one of the designated performance parameters of leaf springs [1].
They both have a direct effect on the fatigue life and strength of the end product [2-5], as they are responsible for the microstructure and mechanical properties of the core and surface of the leaf.

Thermodynamic Analysis for Organic Rankine Cycle Recovery System in Industrial Waste Heat Yang Xin Le1,a Dai Wen Zhi1,b Ren Chang Zai1,c 1Liaoning Technical University, School of Mechanical Engineering, Fuxin, Liaoning, 123000 ayxl_2003@sina.com, b 51761118 @qq.com, c615824882@qq.com Keywords: Industrial waste heat; ORC; Thermodynamic performance; R123 Abstract.
A calculation program was carried and two main factors were given and the influence rules of thermodynamic performance were analyzed.
In this paper , R123 was used as organic working fluid of ORC system in a industrial waste heat, ORC power system was designed, calculation and analysis of thermal performance to the ORC system under the conditions of different parameter, the rules of thermal efficiency and net work was gained and main factors was determined.
parameters/unit value Critical temperature /℃ 183.7 Critical pressure/MPa 3.29 Boiling point/℃ 16 Type of fluid dry fluid ODP 0 Tab.2 Characteristics of R123 Tab.1 Parameters of test system in power generation parameters/unit value Flux of flue gas/ Nm3/h 355000 Temperature of flue gas T/K 611 Working fluid R123 Efficiency of turbine/% 85 Efficiency of pump/% 85 Efficiency of generator /% 90 Efficiency of mechanical /% 95 The choice of working fluid The choice of Low boiling point organic working fluid is an important factor which affects system efficiency.
The temperature-entropy diagram and thermodynamic properties are shown in fig. 3 and tab. 2 [9].

This paper, the Dalian Xinghai Zhong Long Yuan landslides treatment project, analysis of landslides generated by internal causes and predisposing factors, obtained a landslide failure mechanism, and the causes of slope cutting, improve cut flood drainage structures, prestressed anchor Mississauga solid technical measures.
On August 9, 2011, the ninth super typhoon storm Muifa influence, caused landslides geological disasters, megalith tumble into Zhong Long Yuan village, seriously affected the normal life of the residents.
This paper analyzes in detail the landslides mechanism Zhong Long Yuan, the cause of the factors and on this basis to take the concrete wall and prestressed anchor cable engineering reinforcement technology.
(a) Mountain landslide process sketch (b) Mountain landslide photo Fig.1.Mountain landslide process and its photo in Xinghai Zhong Long Yuan 1.2 Engineering Geological Properties Landslides site original landform belong to low hills geomorphic unit, terrain for meteorological north low, slope to for east-west, artificial slope, relief is bigger, slope height of 16.0-20.0m, long approximately 120m, most of the slope height of 20.0m.
Slope cutting combination of mechanical and artificial slope cutting. 2.

This method starts design of ring die from the pellet product property, and then gives concise analyses to the concept design and optimization design of ring die; by this design method, the porosity of the ring die and the pellets productivity of this ring die are increased.
The parameters that affect density of pellet are valid length of hole, hole diameter, ratio between the hole diameter and the hole depth (RHD).
The synthetic affect of pressure force and fraction force made the ring die bending.
Fig.6 Relation between stress and elastic modulus Fig.7 Relation between strain and elastic modulus Summary Key factors affect performance of the ring die structure is obtained.
[9] Youbai Xie: China Mechanical Engineering, Vol.11(1-2)(2000), p.26~32 [10] Yancong Li: Journal of Anhui Agricultural Sciences，Vol. 39(13)2011, p.8100~8101