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Online since: January 2006
Authors: Kunio Funami, Masafumi Noda
b 2.2 Mechanical properties Mechanical properties under biaxial stress were measured using a prototyped biaxial tensile testing machine.
Consequently, different mechanical properties are observed in materials with the same grain size due to the difference in applied stress modes.
Conclusions Various mechanical properties in the biaxial stress state factors necessary for sophistication of forming working and its simulations were obtained by carrying out biaxial tensile tests using the cruciform specimens under a variety of conditions.
The mechanical properties under uniaxial and biaxial stresses were different for specimens with the same crystal grain size because the deformation mechanisms were different.
The influences of grain size on the mechanical properties were also different between the uniaxial and the biaxial stress states. 3.
Online since: November 2011
Authors: Hong Xi Wang, Kai Li, Feng Qin
Temperature change affects not only the accuracy of measuring instruments, but also the size of the gear profile.
After defining the element types and material properties, we mesh the gear model, and add displacement constraints on it.
Therefore, the equation of gear profile can be modified based on standard involute equation, and we calculate the modifying factor by curve fitting.
Conclusion The thermal deformation of gear will affect the accuracy of gear measurement.
Chinese Journal of Mechanical Engineering, 2004(08), Vol.40 No.8:24–29
Online since: September 2005
Authors: Gyuhae Park, Daniel M. Peairs, Daniel J. Inman
The method allows elements to span the entire distance between discontinuities (a change in geometry or material properties) and thus only a few elements are needed to model an entire structure.
This whole process can be easily accomplished by measuring the electrical impedance of the PZT, which enables monitoring the mechanical properties of the structure by measuring the electrical properties.
In the static type, such as the model developed by Crawley and deLuis [6], the actuator force is independent of the actuation frequency, where as in the impedance approach, the dynamic piezoelectric properties are included in the dynamic equilibrium.
Table 1 lists the geometric and material properties used in the model of the beam.
Beam Properties.
Online since: June 2009
Authors: Yang Gao, Xiao Peng Wang, Tian Ning Chen
Influencing factors about the cumulative amount of release drug were analyzed.
Experimental study on PLGA material properties PLGA is the copolymer of polylactic acid (PLA) and polyglycolic acid (PGA).
The performance of PLGA is greatly affected by the monomer ratio of the two components.
The experimental results suggest that degradation rate is mainly influenced by two factors: monomer ratio and intrinsic viscosity.
Influencing Factors of the Drug Release Effect 3.1 The Influence of Micro-Porous Diameter to the Release Result Fig. 4 shows the influence of micro-porous diameter to the release effect.
Online since: March 2005
Authors: J.M. Riveiro, S.E. Paje, F. Teran, J. Llopis, M.A. García, L. Saviot, M.C. Marco de Lucas
OPTICAL PROPERTIES OF SPUTTERED SILVER GRANULAR FILMS S.E.
These exhibit interesting optical properties as a strong visible light by exciting electronic surface plasma dipolar oscillations, or a high non-linear optical susceptibility.
In this work we will study the size and shape distribution of sputtered silver islands in discontinuous films as a function of substrate and sputtering conditions, and the correlation with their optical properties. 2.
The deposition periods were controlled using a mechanical shutter governed with a computer.
The coalescence also affects the optical properties significantly as will be analized in the next section.
Online since: January 2013
Authors: Ji Hua Cai, Min Tian, Zhi Guo Liu, Kuan Cai Yang
Meanwhile, for wire-line coring hydro-hammer drilling, special attention should be paid to maintain the properties stability of drilling fluid, and to deal with the precipitated rock powder and other sundry timely in the circulation system.
The rotating speed is determined mainly in the light of the factors of nature of the rock, drill borehole structure, angle, drilling equipment, tool model, impacting energy and impact frequency.
In fact, rotating speed was far less than the design requirement due to the factors of the complex rock in borehole and equipment capability etc.
Physical and mechanical properties of the rock in testing ore field.
The typical physical and mechanical properties of the rock in testing ore field as is shown in Table 1.
Online since: May 2013
Authors: Patrick Ebunilo, Henry Egware, Samuel Ukwuaba
Mohesenin [21], reported new ways of measuring and utilizing the physical and mechanical properties of biological materials, in the design of agricultural processing machines/equipment but this has not yet been successfully applied to cassava tuber peeling machine.
Ohwovoviole, et al, [15] in their seminal development of a rotary cassava tuber peeling machine measured various physical and mechanical properties of cassava tubers such as length, diameter, weight, skin thickness, coefficient of friction, rolling resistance, Poisson’s ratio, shear stress, peeling stress, cutting force and rupture stress but the rotary peeler could not control depth of peel for unsized lots and is limited to batch production.
The machine which can be easily automated once a suitable mechanized feeding mechanism is attached, was designed, fabricated and tested using only the physical and geometric properties of length and diametral width of cassava tubers only.
The design factors considered most important were: functionality, cost, safety, maintainability and reliability.
Mohesenin, Physical Properties of Plant and Animal Materials, Gordon and Breach Science Publishers NY, Vol.1 ,1970
Online since: June 2013
Authors: Tian Jiao Xiao, Yong Lun Song, Qiu Shi Hu, Chao Li
Recently, large amount of research results confirmed that the characteristics of the welding arc directly affect the welding process and weld quality[3,4].
In our experiments Detection position is selected at radial cross which is from 2.0mm to 3.0mm below tungsten electrode cutting-edge (Figure 4), because in this region has a strong representative physical parameters, and can avoid the near a small amount of tungsten extreme and the near vicinity of the anode metal vapor, whereby the interference factors of the experimental results is minimized.
Effect of pulse frequency to electron density Pulse process promote the enhance effect of the arc energy density in a three-electrode arc ionization region, in order to have further study about the effect of pulse process to arc energy density changes, we test physical properties within the arc with the situation on pulse frequency 2.5Hz ~ 100Hz.
Kumar et al: Effect of welding parameters on mechanical properties and optimization of pulsed TIG welding of Al-Mg-Si alloy,Int J Adv Manuf Technol, (42):118–125 2009 [4] V.K.
Microstructure and Materials Properties, 3(1) 126-140 2008 [10] H.R.Griem.
Online since: March 2013
Authors: Nathalie Bozzolo, Anthony D. Rollett, B. Lin, Yuan Jin, G.S. Rohrer, Marc Bernacki
In this work, the formation of annealing twins in a 304L austenitic stainless steel is examined in relation to the thermo-mechanical history.
Being one of the most important kinds of special boundaries, annealing twin boundaries affect many properties like anti-corrosion and anti-fatigue in a large variety of materials, including such technologically important material as superalloys [2].
In the growth accident theory, the migration distance and migration velocity of grain boundary are two key positive factors to annealing twin generation.
Experimental details 2.1 Material and thermo-mechanical treatments.
Table 1, Chemical composition of 304L Chemical composition of 304L C Mn Si P S Cr Ni N <0.03 <2.00 <0.75 <0.045 0.03 8.0~12.0 8.0~112.0 <0.10 After thermo-mechanical treatment, samples were water quenched to fix as much as possible the microstructure.
Online since: July 2011
Authors: Shi Feng Zhang, Jian Zhang Li, Ying Ying Qiu, Cheng Li, Ji Zhing Zhang, Jin Xue Jiang
Results and discussion Effect of reaction pH value on appearance properties of AP.
Effect of reaction pH value on appearance properties of AP is shown in Table 1.
Table 2 shows that the molar ratio (polyamine/modifying agents) of AP is closely related to its rheological properties.
Thermal properties of AP, SPA, and MSPA.
The molar ratio of AP and hot-pressing temperature were the main factors affecting bonding strength of the plywood.
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