Results 261 to 270 of about 207,604 (309)
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Journal of Fluids Engineering, 1954
Abstract An experimental investigation was conducted to study the effects of cumulative fatigue damage on endurance life. Stepwise-varying stress sequences were applied to rotating-cantilever-beam specimens. Typical curves of fatigue damage versus cycle ratio were deduced. The effect of scatter in the test results was evaluated.
S. M. Marco, W. L. Starkey
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Abstract An experimental investigation was conducted to study the effects of cumulative fatigue damage on endurance life. Stepwise-varying stress sequences were applied to rotating-cantilever-beam specimens. Typical curves of fatigue damage versus cycle ratio were deduced. The effect of scatter in the test results was evaluated.
S. M. Marco, W. L. Starkey
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Journal of Engineering Mechanics, 1992
Three‐point bending fatigue tests are performed on two types of concrete using two different R ratios. The maximum strain is recorded during the tests. A damage mechanics model for the fatigue of concrete is proposed. It is based on a damage parameter proportional to the irreversible increment per cycle of the largest principal positive strain.
A. Alliche, D. Frangois
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Three‐point bending fatigue tests are performed on two types of concrete using two different R ratios. The maximum strain is recorded during the tests. A damage mechanics model for the fatigue of concrete is proposed. It is based on a damage parameter proportional to the irreversible increment per cycle of the largest principal positive strain.
A. Alliche, D. Frangois
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2008
Collagenous tissues can, inevitably, be damaged and broken by overload, but they are also susceptible to the prolonged application of a lesser load. The majority of studies are for bone with tendon in the second place. This chapter therefore concentrates on these tissues.
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Collagenous tissues can, inevitably, be damaged and broken by overload, but they are also susceptible to the prolonged application of a lesser load. The majority of studies are for bone with tendon in the second place. This chapter therefore concentrates on these tissues.
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Remodeling and the repair of fatigue damage
Calcified Tissue International, 1993This paper reviews the direct and indirect evidence for and against the idea that bone remodeling repairs fatigue damage. It defines experiments that should be performed to determine whether the accumulation and repair of fatigue damage is relevant to the pathogenesis of osteoporotic fracture.
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The summation of fatigue damage
Strength of Materials, 19751. Using the energy approach here proposed, we have derived an equation for the summation of fatigue damage. As rupture criterion we take part of the total energy dissipated by unit volume of the materials. 2. The linear hypothesis and the hypothesis of Cortain and Dollan represent limiting forms of the resultant equation for materials ...
A. I. Makeev +2 more
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1989
Cyclic flexural load tests of simply supported beams under central concentrated charge were performed, for two different concrete Young modulus. The strain at the most tensioned fiber was measured during experiments. A model for cumulative damage which is proportional to the strain was used to present the results.
A. Alliche, D. Francois
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Cyclic flexural load tests of simply supported beams under central concentrated charge were performed, for two different concrete Young modulus. The strain at the most tensioned fiber was measured during experiments. A model for cumulative damage which is proportional to the strain was used to present the results.
A. Alliche, D. Francois
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Dissipation and fatigue damage
Materials Testing, 2004Abstract The discussion of fatigue damage is generally separated in two domains: Low Cycle Fatigue (LCF) and High Cycle Fatigue (HCF). The transition zone concerns the case of limited endurance, while the unlimited endurance is generally assimilated with HCF.
Eric Charkaluk, Andrei Constantinescu
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Fatigue Damage Map as a Virtual Tool for Fatigue Damage Tolerance
2009Using only readily available material properties and the concept of dislocation density evolution ahead of the crack tip, the fatigue damage map attends to develop a virtual tool able to predict the limits and the corresponding crack tip propagation rates characterising each of the fatigue stages, namely crack arrest, microstructurally and physically ...
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Materials Science and Engineering: A, 1988
Abstract In this paper the problem of cumulative fatigue damage is considered. On the basis of the invariable succession postulate and the invariable damage postulate, a general form for a one-damage-parameter cumulative-damage model is developed. It has been shown that some of the models previously proposed can be obtained as a particular case of ...
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Abstract In this paper the problem of cumulative fatigue damage is considered. On the basis of the invariable succession postulate and the invariable damage postulate, a general form for a one-damage-parameter cumulative-damage model is developed. It has been shown that some of the models previously proposed can be obtained as a particular case of ...
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Fatigue and thermal fatigue damage analysis of thin metal films
Microelectronics Reliability, 2006In this paper, we summarize several testing methods that are currently available for the characterization of fatigue properties of thin metal films. Using these testing methods, a number of experimental investigations of the fatigue and thermal fatigue of metal films with thicknesses ranging from micrometers to sub-micrometers are described.
Guangping Zhang +4 more
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