Results 261 to 270 of about 56,044 (312)
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Cyclic fatigue of ZTC — Micromechanical modelling
Mechanics of Materials, 1993Abstract Crack bridging is an important mechanism in zirconia toughened ceramics (ZTC). A micromechanical model describing the toughening induced by this mechanism is first briefly recapitulated. The metastable tetragonal zirconia precipitates in the ceramic matrix transform to monoclinic phase under high stresses due to macrocracks in the matrix ...
Jørgensen, Martin Heide +1 more
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Cyclic fatigue of a model feldspathic porcelain
Dental Materials, 1995This study was conducted to evaluate the fatigue parameters of a model porcelain based on the Weinstein patent using cyclic fatigue and to compare the parametric values obtained from cyclic fatigue tests with those from dynamic fatigue tests previously reported by Fairhurst et al.
S W, Twiggs +3 more
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2021
Ultrafine grained Al 6061 processed by high-pressure torsion (HPT) at room temperature was tested for the fatigue properties. The HPT processing leads to the formation of a microstructure with an average grain size of 170 nm. The fatigue behavior of the UFG material and the fracture surface is considered in terms of low and high cycle fatigue.
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Ultrafine grained Al 6061 processed by high-pressure torsion (HPT) at room temperature was tested for the fatigue properties. The HPT processing leads to the formation of a microstructure with an average grain size of 170 nm. The fatigue behavior of the UFG material and the fracture surface is considered in terms of low and high cycle fatigue.
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Cyclic loading and fatigue in ice
Cold Regions Science and Technology, 1981Abstract Isotropic polycrystalline ice was subjected to cyclic loading in uniaxial compression at −5°C, with stress limits 0–2 and 0–3 MPa, and frequencies in the range 0.043 to 0.5 Hz. Stress-strain records showed hysteresis loops progressing along the strain axis at non-uniform rates.
Malcolm Mellor, David Cole
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1992
Mechanical behavior of polycrystalline alumina under cyclic and static tensile loading was studied. Smooth cylindrical specimens of 99.8% alumina were cyclically loaded at both room temperature and 1200°C to produce stress-life curves. A decrease in strength was observed with an increase in temperature.
C-KJ Lin, TA Mayer, DF Socie
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Mechanical behavior of polycrystalline alumina under cyclic and static tensile loading was studied. Smooth cylindrical specimens of 99.8% alumina were cyclically loaded at both room temperature and 1200°C to produce stress-life curves. A decrease in strength was observed with an increase in temperature.
C-KJ Lin, TA Mayer, DF Socie
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Cyclic fatigue of composite restorative materials*
Journal of Oral Rehabilitation, 1989SummaryThe purpose of this project was to investigate and evaluate dental composite restorative materials classified according to filler particle size (microfill, small particle, hybrid) regarding fracture characteristics and susceptibility to stress corrosion. The composite materials were tested by cyclic fatigue in distilled water at 37°C.
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2012
Components in engineering applications operating under cyclic loads, commonly known as fatigue, may become unstable and cause catastrophic failure to occur unexpectedly because of structural instability. It is generally thought that over 80 % of all service failures are associated with fatigue. Therefore, operation of machines or their components under
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Components in engineering applications operating under cyclic loads, commonly known as fatigue, may become unstable and cause catastrophic failure to occur unexpectedly because of structural instability. It is generally thought that over 80 % of all service failures are associated with fatigue. Therefore, operation of machines or their components under
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Cyclic Fatigue of Silicon Nitrides
2008A four-point bending jig was used to determine the cyclic fatigue behavior of one hot-pressed and two different sintered silicon nitrides. The lowest fatigue strengths were obtained in the cyclic tension compression mode, indicating that compressive stresses are effective in advancing the growth of subcritical cracks.
A. -P. Nlkkila, T. A. Mntyla
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Cyclic fatigue of polymer nanocomposites
Engineering Failure Analysis, 2009This paper presents an experimental study on cyclic fatigue of two polymer nanocomposites in two common failure modes: mechanical failure in epoxy nanocomposites and thermal softening in polyamide (PA, nylon) 6 nanocomposites. For epoxy nanocomposites, the effects of hard (silica) and soft (rubber) nano-particles on un-notched samples under constant ...
Gong-Tao Wang +3 more
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Cyclic Fatigue of Zirconia Ceramics
2002Zirconia ceramics can achieve large increases in fracture toughness by controlling their phase transformation from tetragonal to monoclinic structure. The mechanical behavior under fluctuating loads is affected by such transformation toughening effects.
M. Anglada +4 more
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