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Description of Fatigue Loading
2014Fatigue is defined as a process of cycle by cycle accumulation of damage in a material undergoing fluctuating stresses and strains (Almar-Naess, 1985). A significant feature of fatigue is that the load is not large enough to cause immediate failure. Instead, failure occurs after a certain number of load fluctuations have been experienced, i.e.
Weicheng Cui, Xiaoping Huang, Fang Wang
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Load-increasing fatigue test to characterize the interface of composites under fatigue loadings
Journal of Materials Science, 2003The effect of glass-fiber epoxy interface in cross-ply reinforced composites on the fatigue behavior is studied by using load-increasing fatigue test. The damage as measured by stiffness reduction is more significant for the composites with poor bonded fibers as was found for EP sized ones, dependent on test conditions.
J. Gassan, T. Dietz
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On Structural Fatigue Under Random Loading
Journal of the Aeronautical Sciences, 1954The stress spectrum and equivalent fatigue stress of a structure subjected to a random loading are determined on the approximation of a single degree of freedom and the hypothesis of cumulative damage. The results are applied to the development of a similarity expression for the probable value of the equivalent fatigue stress for a panel subjected to ...
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Plantar loading and cadence alterations with fatigue
Medicine & Science in Sports & Exercise, 1999The purpose of this investigation was to identify changes in loading characteristics of the foot associated with fatigue during running.Nineteen healthy subjects ranging from 20 to 30 yr (mean = 22.3, SD = 2.4) were equipped with the Pedar in-shoe measurement system (Novel GmbH) for the assessment of plantar loading. After acclimation to the treadmill,
J D, Willson, T W, Kernozek
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Biodegradation of polyurethane under fatigue loading
Journal of Biomedical Materials Research Part A, 2003AbstractA method utilizing expansion of a diaphragm‐type film specimen was developed to study in vitro biodegradation of poly(etherurethane urea) (PEUU) under conditions of dynamic loading (fatigue). A finite element model was used to describe the strain state, which ranged from uniaxial at the edges of the film to balanced biaxial tensile strain at ...
Michael J, Wiggins +2 more
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Fatigue Maps and Mean Load Dependences
1992The influence of mean stress on fatigue life has been investigated for IN 792 at 800° C The results and their interpretation are reported. For the application of a life prediction model, a suitable input parameter has been determined on the basis of the experimental results obtained. Lastly, a creep-fatigue map is illustrated for IN 792 at 800° C.
DEL PUGLIA, ALDO +2 more
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Fatigue in the Masseter and Temporalis Muscles at Constant Load
CRANIO®, 2007Fatigue is usually defined as the point at which a particular level of force can be no longer maintained. In the present study, surface EMG of the masseter and temporalis anterior muscles was measured in ten healthy young adults performing a unilateral molar (right side) clench. The subjects clenched on a bite force transducer at a fixed force level of
C. Sforza +3 more
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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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FATIGUE CRACK GROWTH UNDER ULTRASONIC FATIGUE LOADING
Fatigue & Fracture of Engineering Materials & Structures, 1997Abstract— In this paper, a stress and modal analysis of an ultrasonic vibration system consisting of a notched specimen and one or two amplifying horns have been performed by using 3D finite element calculations. The stress intensity factors in ultrasonic fatigue crack propagation are evaluated by means of displacement and energy approaches.
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