Search results

As one of important parameters for the tire quality, tire uniformity means that tire circle properties can keep constant under both static and dynamic conditions, such as the tire imbalance, size deviation and force variation [2].
So to study the influence of different factors on the test precision has important significance.
So the mesh in weld seam and heat affected zone need to be refined while the mesh far away from these areas could be scattered [10].
But in some cases, some stress state of the structure may affect the displacement when the frame reaches the resonant frequency [12].
Conclusion According to the analysis above, the main factors which should be considered in the design and optimization of the frame are as follows: (1) The natural frequency of the frame should be forty times more than the rotation of tire when the force variation of the tire is decomposed into tenth harmonic; (2) The first three mode bending vibration amplitudes of columns are larger.

The creep specimens are taken from the extrados part of the elbow, the chemical composition shown in table 1 and mechanical properties under normal temperature accord with ASTM A335 [4].
Due to the difference in materials properties, in heat treatment and forging process, the extrapolated creep rupture strength may be different.
Damage factors are calculated according to eq.3. 0.0 0.2 0.4 0.6 0.8 1.0 0.00 0.04 0.08 0.12 0.16 D t/tr 225MPa 207MPa 190MPa 175MPa 0.0 0.2 0.4 0.6 0.8 1.0 0.00 0.04 0.08 0.12 0.16 D t/tr 190MPa 175MPa 160MPa 148MPa 141MPa (a) (b) Fig. 3 Damage factor vs. life fraction at (a) 595℃ and (b) 610℃ Owing to the lack of creep experiment data at 640℃ and 670℃, the creep damage factors are calculated only at 595℃ and 610℃.
Damage factors change with the life fraction rt t under various stresses, which is shown in Fig. 3(a) and (b).
The creep damage factors at 595℃ and 610℃ were calculated using θ function method and Norton creep damage formula.

So damage factor calculation formula: .
Therefore, under the premise of without affecting calculation accuracy and convergence rates, the viscous coefficient must be as small as possible.
The parameters in plastic damage model can affect the calculation results in different degree.
Investigation into static properties of damaged plasticity model for concrete in ABAQUS [J].Journal of PLA University of Science and Technology, 2007, 8(3):255-260
Experimental Research of Mechanical Behavior on Reinforced Concrete Slab-Column Connections[D].Southeast University of Thesis for Master Degree. 2002

It has been well known that bone has piezoelectric properties and these properties have been considered to be caused by the shift of the center of symmetry of the positive and negative electrical charge due to the strain of the collagen fibers included in the bone.
Introduction It has been well known that bone has piezoelectric properties[1] and it has been said that this properties affect the process of growth and the remodeling of bone.
In the authors’ previous report, HAp thin films were deposited on a Ti or Pt substrate using PLD method, and piezoelectric properties of the HAp film were estimated by measuring vibration responses of the mechanical strains and electrical voltages of the HAp structure simultaneously[5].
Further experiments were needed to establish the fabrication method of HAp films with excellent piezoelectric properties, which are currently ongoing projects.
Hontsu, Measurement of piezoelectric properties of pulsed laser deposited hydroxyapatite thin films on platinum or titanium substrate, Bioceramics Development and Applications, S1-008 (2013) [6] H.

The proportion of MTA powder and water is a common factor impacted on the properties of the material in clinical application.
Water-to-powder ratio is one of the main factors influencing the properties of MTA.
The proportion of MTA powder and sterile water is one of the main factors commonly impact on the properties of the material.
Kheirieh, The properties of a new endodontic material, J.
Yap, Comparison of the physical and mechanical properties of MTA and portland cement, J.

There is no erosion prediction model can be suitable for all conditions well for that the erosion rate of the material is influenced by material itself, caustic fluid, the environment, and many other factors [3].
Experimental materials and methods Experimental material is taken from P110 tubing in Changqing gas field, and its chemical compositions are shown intable1, mechanical properties shown in table2.
Mechanical properties of P110 steel in experiments Tensile strength （MPa） Yield strength （MPa） Elongation（%） Hardness ≥862 758-965 ≥11 ≤241HB Experimental device is self-made erosion test device.
Value range of n in the formula depends on the application situation, the material and abrasive properties.
Sands and chlorine ions influence on erosion and corrosion properties of P110 tubing [J].Chemical machinery, 2012, 39(4):447-448

It has been shown that the creep resistance depends on a number of factors, including the shape of the component phases, the strength difference between the phases, and the stability of the beta phase.
The attractive properties of titanium and its alloys include its high strength to weight ratio, excellent corrosion resistance and biocompatibility.
It is hoped that mechanisms and magnitude of creep deformation can be predicted by considering the microstructure of the alloys, the properties of the component phases, as well as the interactions between the phases.
Ankem and Margolin have shown that interaction stresses in alpha-beta Widmanstätten alloys can affect the mechanical properties of an alloy beyond what simple laws of mixture would predict [16].
In order to fully understand and predict the creep properties of two phase alloys the mechanisms activated during creep deformation must be understood.

Mechanical properties of materials such as Young’s modulus yield and tensile strengths depend on temperature.
The effect of high temperature on mechanical properties is linked to some micro structural transformations of the material due to complex physical processes.
Fatigue properties are affected by temperature.
In practice, one should also consider variations of material properties due to temperature which will have their proper influence on TMF.
The effect due to material properties as they can be affected by temperature was not investigated.

Due to the complex curves of hull frames and the un-uniform mechanical properties of material, it is hard to realize the numerical control of frame shape processing.
Comparing with other control methods, it is easier to use; and the feeding error affects less on the accuracy; the shape of the whole frame and every part of it is more accurate.
Due to the un-uniform mechanical properties of material, it is not fitting to solve this problem with theoretical calculations.
The excess part called as excess-angle will affect the application of gradually approaching method.
It is determined by many factors such as the length of the period, response time of the electrocircuit and solenoid valves, the curvature of the frame shape, temperature and so on.

Introduction Low density and excellent corrosion resistance combined with good mechanical properties as well as high thermal conductivity are the characteristics that aluminium and its alloys can provide for specific applications.
A significant improvement of the mechanical properties of these cast alloys can be obtained if the microstructural features, i.e. the primary α-aluminium grains and the eutectic phase, can be reduced in size [3-4].
Kaufman, Aluminium Alloys (Chapter 3), Mechanical Engineers Handbook: Materials and Mechanical Design, Volume 1, third Ed, pp. 59-62, 2006
Pearson, Factors Affecting Grain Refinement of Aluminium using Ti and B Additives, Metall.
Mondolfo, Aluminium Alloys; Structure and Properties, Butterworths, Boston, 1976.