Search results

In this paper, the machinability of surface is introduced, and it is obtained from the analysis that the main macroscopic factors of tool premature failure are forging defects.
The dynamic change of tool is leaded by the forging defects in the cutting process, so the tool is affected by forging defects (as shown in Fig. 3).
So the tool is always affected by dynamic mechanical impacts in the cutting process.
It is convenient to determine the fatigue limit with periodic number NQ, but the prediction accuracy is not high, because the tool is affected by dynamic mechanical impact and thermal load which have a great influence on the fatigue fracture of tool material in the cutting process (simulation analysis as shown in Fig.5)[13].
Therefore, the foregoing model can be used for determining the tool life of various materials, and at the same time, both the creep resistance and strength property should be taken into account when selecting the tool materials.

Thus, a study of the relations that can exist between the geometrical defects of surfaces and the metallurgical defects of volumes as well as the material properties that resist to the crack propagation is very important.
Finite element model Let us consider an elastic thin aluminium plate with a semicircular lateral notch having the following dimensions: length ; a width , thickness and a notch radius The properties of the material of the plate are: Young’s modulus E and Poisson ratio The mechanical characteristics of the material are shown in the Table 1.
The stress intensity factors, which govern the fracture process in the LEFM context are calculated by using modified crack closure techniques.
Sih, Handbook of Stress Intensity Factors Lehigh University Bethehem PA, (1973)
Peterson, Stress Concentration Factors New York: John Wiley & Sons, Inc (1974)

Among that, the toughness is seem to be the key factor to control fracture failure for the pipeline.
Their mechanical properties are given in Table 1.
Table 1 Mechanical Properties of Test Materials Material Tensile strength Yield strength Elongation Rm [Mpa] Rp0.2[Mpa] [%] base metal 713 643 38 weld 696 601 26.5 The fracture toughness test was performed as Chinese GB/T 21143 [3].
But it also brings a question whether these methods will affect the accuracy of fracture toughness test or not.
KIC is the critical stress intensity factor of the pipe material.

Mechanical Properties.
Mechanical properties of ENR-30/clay nanocomposites containing different types of montmorillonite clay.
A similar observation also has been reported for the effect of nanoclay on the mechanical properties of ENR-50 [5].
Compatibility between the ENR matrix and OC-MMT is one of the main factors in determining the mechanical properties of the nanocomposite.
This is probably the reason why the best mechanical properties were observed for the ENR-30/OC-MMT nanocomposite.

Many researches reported the forming of the nano ceramics and its properties[2-5], but researches on the grinding mechanism are insufficient.
The critical ductile grinding depth relates to not only the processing methods and the material properties but also the geometric parameters of cutting lip, grinding speed, grinding depth, grinding fluid and so on.
The changes of the inner micro-characters of the material under ultrasonic wave field are the important factors which affect the value of ξ [6]. ξ of common brittle material misfit the nano-ZrO2 ceramic.
The factors that affect ξ2 may relate to the micro-change of the material constitutive relation under ultrasonic energy, which is the reason of the change of E and H.
The experiment proved that various factors affect the ξ value.

Strong anisotropy of physical and mechanical properties of Potassium Dihydrogen Phosphate (KDP) crystals significantly affects surface quality during processing the samples.
At the same, Anisotropy of mechanical and physical properties of KDP crystal also significantly affects surface quality during processing the samples.
It is well known that the anisotropic nature of mechanical properties of single crystal is responsible for its structure.
Elastic modulus and microhardness is one of mechanical properties to estimate elasticity and plasticity of crystal materials.
Ductile depth of cut is also quite different due to different mechanical properties along different orientations on KDP (001).

A chemical composition of DP800 steel in mass percentage Sheet metal C Si Mn P S Nb V B Fe DP800 0,129 0,2 1,52 0,014 0,003 0,015 0,02 0,0003 rest The mechanical properties of the base materials are shown in Table 3.
The mechanical properties of the base materials Base material Rm [MPa] Rp0,2 [MPa] A50 [%] 5754-H22 220 137 22 6082-T6 348 303 15 DP800 873 599 13 The creation of a mixed bond between aluminum and steel is hampered by several factors.
Based on the literature [5, 9, 10], it became clear that the goal is the formation of intermetallic compounds (IMCs) in the plane of the joint during welding and its properties can affect the mechanical properties.
According to the literature [5, 7], the properties of this layer fundamentally determine the properties of the joint.
It is worth examining the thickness of the layer, which can have a serious effect on the mechanical properties.

Until now, many studies have been reported about the effects of pre-strain [2-5], carbon content [6], grain size [7] and etc. on the fatigue properties of carbon steels.
Most of those studies were focused on the tensile and/or bending fatigue properties; though few reports were concentrated on the torsional fatigue properties [8-10].
This study is on the research of tensile pre-strain effects to the torsional fatigue properties of three kinds of structural medium carbon steels.
Next they were normalized at the specified temperature by 2hours, as listed in Table 2, and the main mechanical properties of the test materials are also listed in this table.
Table 1 Chemical composition (mass%) Materials C Si Mn P S Al S25C 0.26 0.25 0.39 0.017 0.013 - S35C 0.36 0.23 0.76 0.021 0.022 0.001 S45C 0.46 0.20 0.73 0.029 0.017 0.018 Table 2 Heat treatment conditions and mechanical properties Heat treatment condition σY [MPa] σB [MPa] ψ [%] S25C 895°C 2hrs A.

The main factors affecting the pattern of formation of detonation coatings are heating, melting (full or partial), deformation and spreading of particles on the surface.
Cross section of coatings after thermal annealing: a) 700 °C, b) 800 °C, c) 900 °C One of the main factors determining the quality of the coating, affecting the duration of the work, is adhesion.
EL-Raghy, Processing and mechanical properties of Ti3SiC2, J.
Watanabe, Mechanical properties of Polycrystalline Ti3SiC2 at ambient and elevated temperatures, Acta Materialia. 49 (2001) 937-945
Barsoum, Microstructure and mechanical properties of porous Ti3SiC2, Acta Materialia. 53 (2005) 4359-4366

This paper presents the results of a study on a joint slope deformation affecting the western slope of the GuangYang highway (YangQuan, China).
Properties of rock masses.
The properties of joints are listed in Table 3.
Factors of safety were determined within a tolerance of 0.05.
As the SRF is increased, the strength properties are decreased.