Search results

Therefore, people used hot peening, rolling, extrusion and other surface strengthening process to improve the surface properties of metal.
It has the advantages of non contact, no heat affected zone, strong controllability and strengthen the effect of significant advantages.
n Main factors affecting LSP process Laser parameters include laser power density and the laser pulse width.
And the dense dislocations, vacancies and vacancy clusters of the metal surface can change the metal microstructure and mechanical properties.
It is the target of reliability design that the equipment meets reliability requirements within the life cycle considered in the equipment performance, reliability, cost and time and other factors on the basis.

For that reason the knowledge of the mechanical properties of these deformation layers are of vital importance.
For that reason the microstructure and furthermore the mechanical properties of such deformation layers are of interest.
In the last decades a variety of studies have shown that severe plastic deformation (SPD) is capable of producing materials with remarkable physical and mechanical properties due to a strong grain refinement [3,4].
It should exclusively affect the absolute value of torque.
Badeshia: Bainite in Steels, Transformations, Microstructure and Properties (IOM Communications LTD, England 2001) [8] F.

However, because of the influence of this residual stress, such problems as reduction of dimensional accuracy by deformation after processing and deterioration caused by a change in mechanical properties occur [1].
Trial runs of face milling were performed by varying one of the process factors at a time to determine the range of each factor.
The final mathematical model terms of actual factors as determined by the Design-Expert software are shown in Eqs. (1)-(4).
The perturbation plot helps to compare the effect of all factors at a particular point in the design space.
In the case of more than one factor, this type of display could be used to find those factors that most affect the response [9].

The problem undertaken in the present work concerns the kinetics of evolution of radiation induced damage under mechanical loads.
Introduction As an example of typical problem related to evolution of radiation induced damage, degradation of material properties in a thin-walled irradiated cylindrical part of detector of particles has been investigated.
In order to combine both types of damage: radiation induced and of mechanical origin, additive rule is postulated.
Single cycle is composed of emission of the particles flux, production of cluster of voids and further mechanical loading.
Given the fact, that increment of damage is for real applications rather small (), the effect of existing voids, forming effective sinks for new radiation induced vacancies, is negligible and it slightly affects formation of new clusters.

For example, Li et al. improved the mechanical properties of Fe-Mn-Cr-Ti dual phase steel by combining various strengthening mechanisms, namely, phase transformation, precipitation, and grain refinement strengthening [5].
Furthermore, to study the mechanical properties of Cu-Ti microalloyed DP steel, another experiment (process B) was performed in the Gleeble 1500 thermal-mechanical simulator.
Vickers Hardness and Mechanical Property.
The factors determining the strengthening of microalloyed DP steel are mainly the ferrite grain size, volume fraction of martensite, and precipitation strengthening [18].
Mechanical properties of Cu-Ti microalloyed DP steel after different tempering treatment conditions (Process B).

Fire damage, could be one of important factors since European countries have been used pervious concrete in buildings construction.
At this level, the heat affects most materials, provoking the spontaneous combustion of some of them and affecting the resistance of others.
Aggregate deterioration results in micro-cracking and worsening of physical properties.
And steel fibers might also improve the mechanical properties, ductility and resistance against cracking.
[9] Xiaomeng Hou, Muhammad Abid, Wenzhong Zheng, Ghulam Qadir Waqar, “Evaluation of residual mechanical properties of steel fiber-reinforced reactive powder concrete after exposure to high temperature using nondestructive testing,“ Procedia Engineering, Vol. 210, pp. 588-596 (2017)

Combined with the of Ningbo metro, this paper adopts the finite element method to analyze two sides of affecting factors, i.e., construction load and the distance between the loading position and the horizontal projection distance of the tunnel, so as to study the impact of shallow foundation load on the displacement of adjacent existing shield-tunnel, and affecting law is analyzed, which can be used to guide the practice of engineering construction.
Physical and mechanical property parameters of major soil layers Plaxis2D program is useded to set up the plane model, in which the depth of the model in direction of the shallow foundation is 50m, the depth of the tunnel is 9m, the width of load is 10m, the construction load and the net distance between the construction and the horizontal projection of the tunnel are variables.
As there are differences between physical and mechanical indexes of the sub-layers in the same soil layer, from the point of view of safety, this paper chose the group of geological parameters in sub-layers of the same layer in Chart.1 whose compression modulus are small.

The AWJM technology is generally used for harder and heavier machinable materials like thick sheets, composite materials with metal and ceramic properties and others within these categories to just cite a few.
The contribution is mainly focused on the analysis of the surface properties of the steel S235 after the cutting process, and this depending on the cutting speed of the water jet.
Water Jet Cutting The water jet technology is currently used mainly for the cutting and machining of materials with special mechanical properties such as titanium alloy [3], hard-to-machine materials and alloys [4], as well as glass, graphite, ceramic, plastics, and many composites [5].
Similarly, the cutting process is also influenced by several other peculiarities and properties of the materials [16].
South, Optimization Factors in Abrasive - Waterjet Machining, J.

Salim4 1 Faculty of Mechanical Engineering, Universiti Teknologi MARA,Permatang Pauh, Pulau Pinang, Malaysia. 2 School of Mechanical Engineering, Universiti Sains Malaysia Eng.
In addition, the physical properties of palm oil and its blends were studied in accordance with ASTM standards.
Higher viscosity would significantly affect the fuel spray structure due to poor atomization.
The similarity is due to their similar fuel properties.
Lower concentration of such P20 palm oil indicates the properties quite close to that of diesel.

This contribution focuses on reliability analysis affected by the fuzziness in basic variables.
According to the properties of RPD and FPD, Eq.2 is used to transform FPD to RPD equivalently, and this equivalent transformation does not change the distribution form of FPD [3,4,9]
Factor F shown in Eq. 3 is an integration measure of the fuzzy-random joint distribution (FRJD) in all real number universe.
Chen: J. of Mechanical Strength, Vol.25(2003), p.187.
Chen: Mechanical Science and Technology, Vol.22(2003), p.444.