Search results

Excellent combination of mechanical properties makes bainitic steels very attractive for commercial application.
Fig. 1: Electron micrographs of (a) upper bainite in martensitic matrix, (b) lower bainite in martensitic matrix [1] Factors such as alloying content, the transformation temperature and the related morphology of bainite strongly influence the mechanical properties [2].
Fig. 6 shows examples of reached mechanical properties of different alloying concepts.
Caballero et al. [14] described mechanical properties of those bainitic steels and stated the following tensile properties.
Fig. 9: Mechanical properties of bainitic steels with residual austenite (RA) developed at Institute of Metal Forming and compared with steels (C45 and DP600) The mechanical properties of bainitic steels cover a wide spectrum.

The Surface Mechanical Attrition Treatment (SMAT) was first used to generate nanocrystalline layers on the elementary plates so that their mechanical properties were improved.
It shows excellent anticorrosion properties but poor mechanical strength.
One potential solution to this problem is to apply a mechanical surface treatment to improve its mechanical strength without affecting its anti-corrosive properties.
Measuring the mechanical properties of the oxides is difficult because of their limited volume and non-homogenous structures.
In order to control the nature and frequency of the shear banding, the mechanical properties and dimensions of the base metals and the oxide are considered as important factors.

For enhanced mechanical properties of ceramics for structural application, a great deal of attention has concentrated on preparation of layered composites.
Introduction In order to enhance mechanical properties of ceramics, e.g., strength and toughness, multi-layered type composites processing method was developed.
Therefore, residual stress which is generated at interfacial region is one of the important factors of affecting mechanical properties of composites.
Table 1 Mechanical properties and Flexural strength of monolithic and layered composites Material Mechanical properties Flexural strength Monolithic composite (20% vol.% ZrO2) E=348Gpa, ν =0.26, α=9.8(10 -6/K) 250MPa (sintering at 1600 O C) Residual stress 3-Layered composite 300MPa (at interface) 323MPa (sintering at 1600 O C) (a) Schematic view of bending test (b) FE model for damage analysis Fig. 2 Analysis model of bending test Fig. 3 Comparison of the damage distribution under same load level (1,200N) (left: Monolithic composite, right: 3-Layered composite) Comparison of Monolithic and Three-layered Composites In this paper, the mechanical performance of the three-layered composites having residual stress has been evaluated using the developed simulator.
The Mechanical properties and flexural strength of monolithic and layered composites are given in Table 1.

This paper provides a probabilistic approach to predict the time-evolution of the mechanical and geometrical properties of a reinforced concrete structural element (i.e., bridge pier) subjected to corrosion-induced deterioration, due to diffusive attack of chlorides, in order to evaluate its service life.
In particular, at the initial time instant (t0=0 years), the materials mechanical properties and the deterioration modelling parameters are obtained for each sample generated within the Monte Carlo simulations.
The statistical quantification of the model parameters describing the chloride induced corrosion and the mechanical properties of materials adopted in the present study is provided in Table 1.
Conclusions The structural lifetime of a deteriorating reinforced concrete element, exposed to an aggressive environment, is investigated by proposing a computational fibre-approach to predict the time-evolution of its mechanical and geometrical properties, mainly considering the damaging process induced by the diffusive attack of chlorides.
Cornell, Probability-Based Load Criteria: Load Factors and Load Combinations, Journal of the Structural Division, Vol. 108(ST5), 1982, pp. 978-997.

Practical application shows that the polish has a good anti-wear, the wear properties and anti-rust properties, stable performance, and meets the needs of the chemical mechanical polishing, the rate of biodegradation more than 80%.
In addition, the polishing pad properties (such as materials and flatness, etc.) will greatly affect the polishing effect[4].
Therefore, it is necessary to highlight the anti-rust properties.
Select fungicides, consider the following factors: 1).
Under laboratory conditions, with good anti-wear, wear properties and anti-rust performance, stable performance to meet the needs of the chemical mechanical polishing. 2).

The use of ground solar cells on the mechanical properties of cement-based composite was investigated, and as a result, we identified the factors affecting the strength for those of cement mortar specimens which predefined and made in lab.
The objective of this paper aims at the properties of alkali-activated materials in solar PV cells.
There, it’s the purpose of this study to investigate the use of ground solar cells on the mechanical properties of cement-based composite.
The use of ground solar cells on the mechanical properties of cement-based composite was investigated.
Provis and J. van Deventer: Geopolymers: structures, processing, properties and industrial applications, Woodhead Publishing Ltd., (2009)

The statistical models derived from the factorial design approach can be used to quantify the effect of mixture parameters and their coupled effects on fresh and mechanical properties of SCC.
By combining the advantages of UHSC and SCC, ultra high-performance concrete (UHPC) can possibly be formed which has proper workability (slump flow greater than 600 mm) and excellent mechanical properties (28-day compressive strength greater than 100MPa).
By definition, two is the number of levels of each factor investigated; four is the number of factors investigated.
Statistical models for mechanical properties With the help of Design Expert software, experimental design and analysis can be done.
“Mechanical properties of prestressed self-consolidating concrete,” Materials and Structures, DOI: 10.1617/s11527-012-9989-9, Online first [2] Long, W.J, Khayat, K.H, 2011.

The study focused on the effect of alumina content on the physical and mechanical properties of such ceramic foams sintered at 1500°C for different sintering times.
Physical properties and mechanical strengths depended upon ceramic composition as well as sintering time.
Several characteristic properties of porcelain ceramics (e.g. mechanical strength, dielectric strength, corrosion resistance and thermal stability) cannot be obtained in other materials [10].
Instead, pore size and pore distribution after sintering strongly affected the physical and mechanical properties of the porous ceramics.
Evans, Factors affecting the microstructure of a fine ceramic foam, Ceramics International. 26 (2000) 887-895.

The mechanical and biological properties of bionic structure porous alumina ceramics are also characterized.
And two step freeze casting [9] is used to prepare the bionic structure in order to improve the mechanical properties.
The morphologies, porosity and pore connectivity of porous ceramic are characterized, and mechanical properties and biological properties are also investigated.
There are two factors affect the change of porosity.
Two factors are opposites, but inner radius is conducive to increase the size of the scaffold porosity.

Surface/subsurface processing damage on optical component can severely affect its surface mechanical properties and cause its resistance to external deformation to deteriorate.
At the same time, the processing damage will also affect the surface quality.
The results show that the light intensity enhancement factors can reach 4.7 and 1.9 respectively, when the surface scratches and microcracks are much smaller than the incident wavelength.
According to the Hertz contact theory, the maximum critical deformation depth of the elastic contact is defined as follows [13]: (1) Where Hw, Ew, rw, mw represents the hardness, modulus of elasticity, density, and Poisson's ratio of the mechanical properties of the optical workpiece material, respectively. k is the average contact pressure factor and is generally taken as 0.4.
The following chemical reaction can be expressed as: (3) The electron cloud density between the surface atom and the subsurface atom changes due to the difference in chemical properties of the hydroxyl group and the matrix constituent atom.