Search results

In this context, the aim of this work was to evaluate the microstructure and tribo-mechanical properties of Ti6Al4V alloy manufactured by SLM and the effects of subsequent stress relief heat treatments on such properties.
Currey, Cortical bone, in: Handbook of Biomaterial Properties, J.
Chong, Space-holder effect on designing pore structure and determining mechanical properties in porous titanium, Materials and Design, 57 (2014) 712–718
Humbeeck, Heat treatment of Ti6Al4V produced by Selective Laser Melting: Microstructure and mechanical properties, Journal of Alloys and Compounds, 541 (2012) 177–185
Van Humbeeck, Microstructure and mechanical properties of a novel β titanium metallic composite by Selective Laser Melting, Acta Materialia, 68 (2014) 150-158

Introduction Although pumps are fluid-flow machines, mechanical losses, friction losses in particular, are a substantial factor affecting their total efficiency.
Apart from friction losses affecting the general efficiency of hydraulic machines, the life of tribological pairs is of great importance.
Unsatisfactory performance of seals makes another problem affecting pump efficiency.
Textured surfaces mean surfaces possessing isolated regular areas that can be described by geometrical, physicomechanical and physicochemical properties which are other than those used for the rest of the layer.
Model of textured surface layer: a) surface texture, b) volume texture; 1 – base, 2 – transitory layer, 3 – specific layers [5] Regularity of areas of distinguishable properties is characteristic of texture.

Various parameters and properties include mixing energy, Mooney viscosity, curing, mechanical and dynamic mechanical properties of rubber compounds and vulcanizates have been investigated.
Cure properties, mooney viscosity (ASTM D 1646-94), Cross-link density (Flory–Rehner equation), mechanical properties (ASTM D 412-06) and dynamic mechanical properties (by DMA technique) were investigated.
The crucial factor of Tg is the structure of processing oil.
In the dynamic mechanical properties study, it can also consider the capability of using for industrial applications from the tested data.
Moreover, palm benzyl ester gives better mechanical properties to the rubber compound than the one with aromatic oil.

There are many factors which affect springback, such as mechanical properties of the material, friction conditions, and process parameters and so on.
Material Properties Simulation of the forming processes based on finite element method using Dynaform 5.8.1 software requires as input data the mechanical properties of the used materials.
Determination accuracy of the mechanical properties has an important influence on simulation results.
By varying the values of all factors simultaneously, a statistically validated estimate of the results for every possible combination of the factors is possible.
This analysis approach determines not just the primary effects of each factor but also the interactions between the factors.

Any possible pathways for moisture within the stonework caused by architectural factors or structural damages will enhance the distribution of salts and air-pollutants and their concentration over time as well as contribute significantly to its biological colonization and further biodeterioration [5].
The former is determined by the water surface tension and adhesive forces, while the latter by the hydrostatic pressure and depends on the permeability properties of the material.
The presence of salts in buildings can be due to several factors, such as air pollution and sea spray [1], chemical reactions, primarily present in building materials, added during reconstruction or renovation of buildings, or transported by rising damp [6].
The dry-mechanical removal of efflorescence can affect the thermodynamic behaviour of salts in relation to environmental conditions and can influence the drying behaviour of the object [12].
The parameters affecting the performance of the poultice are the water source (moistening of masonry, from the poultice itself or from a partial bath), poultice composition (clay, cellulose compounds, other, or their mixtures), thickness of the layer, and environmental conditions (affect the kinetics and/or location of salt).

Influence of Initial Defects on the Mechanical Properties of Single Crystal Copper: Discrete Dislocation Dynamics Study Mingyi Zhanga, Min Zhongb, Shuai Yuanc, Jingsong Baid and Ping Lie Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China azmy1688@163.coml, bzm000@caep.cn, cyscaep_01@sina.com, dbjsong@foxmail.com, eLp0703@263.net Keywords: Discrete dislocation dynamics, single crystal copper, interstitial loops, irradiation defects, initial defect density.
Studies rarely pay attention to the influence of initial defects on the mechanical response of metals, though it is a key factor to determine the mechanical properties of crystalline metals [17].
In this paper, the DDD simulation is used to quantitatively study the influence of initial defects on the mechanical properties of single crystal coppers, and the underlying reasons for irradiation hardening and strain hardening are investigated and analyzed from the aspect of initial defects in crystalline metals.
Influence of Initial Defect Density on Mechanical Properties.
Interactions between dislocations and interstitial loops affect the evolution of dislocation microstructure.

The paper introduces the working principle of the system and analyzes the factors that affect the accurate measurement.
By considering the flow resistance, material properties, manufacturing difficulties and other factors, the optimum cross-sectional shapes of a single probe tube was identified as the circular.
In addition, factors affecting the flow coefficient should be considered, for example, Reynolds number, fluid expansion correction factor, thermal expansion coefficient of the measuring device, the flow area ratio.
The performance test The establishment of an aerodynamic testing system.To further study the properties of measuring devices, an open air-solid two-phase test system is building.
When the angle is less than is less than 6°, the error is less than 1%. 5, Structures and properties of the average pressure chamber and the gravity pendulum, etc. are scientific and reasonable , anti-purging system is working properly.

As a representative of mechanical properties, the hardness was also measured.
The surface of spherical roller “D” (tested for 20 hours) was also affected by contact fatigue; the depth and frequency of pitting were slightly higher in comparison with the outer ring.
The predisposition to this type of failure is determined by Bruscate´s X-factor and Watanabe´s J-Factor [1].
The calculated value of J-factor (304) almost three-times exceeds the recommended value (120).
The chemical composition of the outer ring and spherical roller “C” is affected by undesirable presence of Sn and Sb, which cause lower plasticity of the component parts.

Joint spacing is one of the significant factors affecting the rock fragmentation by TBM cutters.
Introduction Joints factors, such as joint orientation, joint spacing, and joint strength, etc., have a great effect on rock fragmentation by TBM cutters.
Particularly for the factor of joint spacing, many researches have been conducted by field observations, lab testing and numerical modelling.
The researches reviewed above have illustrated that the joint spacing is an important factor to TBM penetration rate.
In the test, two kinds of concrete with different strength are adopted to simulate rock sample, and the physical and mechanical properties of the rock sample are listed in Table 1.

The weld characteristics were designed as spot welds using a U-bending type simulation, considering factors influencing cracking, such as residual stress levels of 154 MPa and 220 MPa, and welding durations of 3 and 6 seconds.
Table 2 Mechanical properties of JIS G4404 SKD 11 [14] Parameters Details Yield strength 154 MPa Tensile strength 231 MPa Elongation 56 % Fig. 4 Schematic an illustration of experiment Fig.5 Position of checking weld crack The weld cracking was verified by liquid penetrant testing (PT), and eddy-current testing (ECT) for seeking the crack depth when compared with the reference standard block.
The results indicate that the welding process alters the microstructure of the material due to thermal influences, which subsequently affects its mechanical properties.
Among the factors studied, welding time emerged as the most critical parameter affecting crack formation when compared to residual stress levels.
[5] Wenchen Xu, et al., Combination of eddy current and heat treatment for crack healing and mechanical-property improvement in magnesium alloy tube, Journal of Magnesium and Alloys 9 (2021), pp. 1768–1781