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Online since: November 2015
Authors: Ruxandra Ileana Badea, Alina Nela Iliescu, Mihai Berteanu, Ileana Ciobanu, Nida Alexandra Cojan Carlea
The new walking pattern is characterized by: reduced speed of walking; long double support period; early foot contact on the unaffected side; limited ankle dorsal flection at initial contact and during stance; knee hyperextension in stance phase and diminished knee flexion in swing phase on the affected side.
All these changes are given by: diminished strength due to low levels of power generation in many muscle groups, changes in mechanical properties such as increased spasticity of plantar flexors and knee extensors [6].
They also point out that the same type of asymmetry can be caused by various factors.
Online since: June 2010
Authors: Bing Yang, Yong Xiang Zhao
However, quality of cast steels is highly relative to fabrication technologies e.g. shrink cavity shapes and sizes were greatly affected by the cooling velocity of cast process and the wear resistance of high Cr cast steel was mostly relative to austenite content [5].
Mechanical properties are around 188 GPa for Young's modulus, 254 MPa 0.2% proof strength, 453 MPa ultimate tensile strength, 26 % elongation, and 45 % reduction of area.
After testing, growth rate data, da/d�i, at the crack size, ai, are evaluated by a differential method to the crack length-fatigue cycles (a-�) relation by the quadratic polynomial with the local five data 2 2 1 2 2 1 1o       − +      − += C C� b C C� bba i i i ; 1 1 2 1 ≤ − ≤− C C�i ; ( )nini ��C −+ − = 5.02 ; niini aaa + − ≤≤ (1) ( ) 2 2 1 2 2 1 2 d d C C�b C b � a i i − +==      (2) Furthermore the stress intensity factor range, ∆Ki, at ai is defined as ( ) ii KRK max1−=∆ ; ( )iii fWBPK α max max = ; ( ) ( )( ) ( ) 5.1 4 3 2 126.572.1432.1364.4886.0 iiii i i if αααα α α α −+ −+−+= ; Waii =α (3) where Pmaxi is maximum value of ith cyclic test load; Kmaxi is maximum value of stress intensity factor with respect to Pmaxi and ai.
Online since: February 2018
Authors: Massimiliano Ferraioli, Gianfranco de Matteis
The Existing RC Building under Consideration Geometry, material properties and structural details.
The mechanical properties of the construction materials were taken from limited in-situ testing.
The mean strength values were divided by a Confidence Factor CF of 1.2 corresponding to normal knowledge level KL2.
This damping is evaluated as a weighted average of the equivalent viscous damping factors of bare frame (x(F)) and dissipative panels (x(DB)), as follows: (1) Figure 5: Seismic retrofitting of the existing RC building by metal shear panels.
Thus, the equivalent linearization procedure might adversely affect the accuracy of the pushover procedures.
Online since: March 2013
Authors: You Wang, Liang Wang, Xiao Guang Sun
This is primarily due to the fact that ceramic and metal have very different properties.
The thermally grown oxide (TGO) which is mostly generated between the metallic layer and ceramic layer is often one of the most important factors inducing the failure of the coating.
Many literatures have reported the thermal physical properties of zirconate-based bulk ceramic materials, very little investigation focused on the zirconate-based TBCs.
The aim of this study will try to make clear the difference and influencing factors of the high temperature oxidation behaviour of the three as-sprayed TBCs.
(2) Thermally grown oxide (TGO) is an important factor which can affect the failure mode of the TBC at high temperature.
Online since: September 2013
Authors: Ninoslav Zuber, Rusmir Bajrić, Safet Isić
The spectral analysis may be unable to detect gear failures at an early stage of fault development, above all in the case of local faults, which primarily affect sidebands; in fact, it may be very difficult to evaluate the spacing and evolution of sideband families in the spectrum, taking into account that several gear pairs and other mechanical components usually contribute to the overall vibration.
Above proposed parameters perform better fault identicifaton, compared with the FM0, FM4, energy ratio (ER), sideband index (SI) and sideband level factor (SLF) in detecting and diagnosing planetary gearbox faults [34].
The use of cyclo-stationary properties of signals to identify and characterize sources of modulation has been approved in mining industrial gearbox [39].
Yang, Interpretation of mechanical signals using an improved Hilbert–Huang transform, Mech.
[39] Zimroz, R., Bartelmus, W., Gearbox condition estimation using cyclo-stationary properties of vibration signal, Key Engineering Materials 413-414 (2009) 471–478
Online since: October 2015
Authors: Holmer Savastano, Diana Cayuela Marín, Waldir Mantovani, Cátia Relvas, Raul Fangueiro, Júlia Baruque-Ramos, Bárbara Maria Gama Guimarães, Welton Fernando Zonatti, Fernando Cunha
Results and discussion Tensile properties The results obtained in tests carried out on universal tester machine are presented in Table 1.
There are a significant number of studies about hemp employment as reinforcement in thermoset and thermoplastic composites, based in its mechanical and thermal properties [22, 23].
Properties and potential applications of natural cellulose fibers from cornhusks.
The effect of alkalization and fibre alignment on the mechanical and thermal properties of kenaf and hemp bast fibre composites: Part 1 – polyester resin matrix.
Injection-Molded Short Hemp Fiber/Glass Fiber-Reinforced Polypropylene Hybrid Composites—Mechanical, Water Absorption and Thermal Properties.
Online since: October 2015
Authors: Hardev Singh Virk, N. Varalaxmi, Sivakumar Kota V
The acoustic parameters usually determined are elastic constants, attenuation coefficients or loss factors.
The mobility of these defects, which is intrinsically related to the mechanical properties of material, can be investigated by this technique.
Thus studies on the elastic and anelastic behaviour of ferroelectric, ferromagnetic, ferrimagnetic, or ferroelastic materials throw considerable light on the phase transitions present in those materials since these properties are lattice related properties. 5.
Mason, Physical Acoustics and the Properties of Solids, Van Nostrand, Princeton, New Jersey (1985)
[40] S.R.Murthy, Elastic and Magnetic Properties of Nanosized NiZn Ferrites, Proc. of ICF 8, Kyoto, Japan (2000) 310 [41] T.
Online since: June 2013
Authors: Xiao Gang Wu, Rui Xue Liu, Nan Nan Ding
The literature [2-3] presented different design methods with the magnetic properties and the structure design of magnetic powder clutch, in order to reduce the energy loss and improve the performance of torque transmission.
The transfer torque of magnetic powder clutch is not affected by the speed for the rotary member.
China Mechanical Engineering, vol.16, no.11, pp.1029-1033, 2005
Journal of Mechanical Engineering, vol.46, no.13, pp.116-121, 2010 [5] Xiaogang WU, Xudong WANG and Tengwei YU.
Fuzzy control research of magnetic powder clutch based on variable learning factor particle swarm optimization[C]. 2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, vol.4, pp.117-120, 2010
Online since: August 2021
Authors: Yulia Indriani, Afifah Sri Agustiah Putr Sutanti, Megadita Ayuningtyas, Hendri Widiyandari
By optimizing the material properties to have a large amount of active material on the surface.
The mechanism of photocatalyst activity on TiO2 will lead to self-cleaning and antibacterial properties under exposure to UV radiation.
After the drying process, heating is carried out to improve the mechanical properties of the film and for complete polycondensation.
However, several other things need to be done to identify the structural properties of the TiO2 film so that it can provide a broader explanation of the surface morphology, pore structure, and other properties.
The main factor in the degradation process using photocatalysts is the light intensity which affects the number of photons and the amount of catalyst used to transmit light properly so that sufficient electron-hole pairs will be formed in the photodegradation process.
Online since: September 2014
Authors: J. Meinhardt, A. Lipp, Marion Merklein, Ingo Heinle, Andreas Sabathil
Chemical composition and mechanical properties of the investigated material are given in Table 1.
Table 1: Properties of investigated aluminum alloy AlSi0.6Mg0.5.
Chemical composition [wt%] Si Fe Cu Mn Mg Cr Zn Ti 0.6 0.16 0.13 0.1 0.7 0.01 0.01 0.03 Mechanical properties (Mean value / Deviation) YS [MPa] TS [MPa] Lankford Coefficients R0 R45 R90 116.3 / 0.5 222.4 / 1.2 0.70 / 0.02 0.49 / 0.01 0.64 / 0.01 Evaluation methods The evaluation is carried out using two different methods.
higher factor 10) than slope of the steady fit, the stage where lines cross is used.
Slopes given in Figure differ by factor approx. 80, so stage closest to where the lines cross is used.
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