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Vibration fatigue

About: Vibration fatigue is a research topic. Over the lifetime, 3460 publications have been published within this topic receiving 46297 citations.


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Journal ArticleDOI
Fansong Li1, Pingbo Wu1, Jing Zeng1, Chaotao Liu1, Hao Wu1 
TL;DR: The formula for calculating the time history of structure dynamic stress under multi-load input condition was deduced based on structural dynamics theory, and fatigue life prediction of weld toe was performed by notch stress approach to guide the lifeguard structure optimization.

14 citations

Proceedings ArticleDOI
01 Jan 2005
TL;DR: In this article, a fatigue evaluation method related to frequencies was proposed to evaluate fatigue damage of piping junction model tests conducted at Oarai Engineering Center, where the first step of this method is an evaluation of power spectrum density (PSD) on fluid, from design specifications such as flow rates, diameters of pipes and materials.
Abstract: Fluid temperature fluctuates at an incomplete mixing area of high and low temperature fluids in nuclear components. It induces random variations of local temperature gradients in structural walls, which lead to cyclic thermal stresses. When thermal stresses and cycle numbers are large, there are possibilities of fatigue crack initiations and propagations. It is recognized that there are attenuation factors depending on fluctuation frequency in the transfer process from fluid temperature to thermal stresses. If a frequency of fluctuation is very low, whole temperature of the wall can respond to fluid temperature, because thermal diffusivity homogenizes structural temperature. Therefore, low frequency fluctuations do not induce large thermal stress due to temperature gradients in structures. On the other hand, a wall surface cannot respond to very high frequency fluctuation, since a structure has a time constant of thermal response. High frequency fluctuations do not lead to large thermal stress. Paying attention to its attenuation mechanism, Japan Nuclear Cycle Development Institute (JNC) has proposed a fatigue evaluation method related to frequencies. The first step of this method is an evaluation of Power Spectrum Density (PSD) on fluid, from design specifications such as flow rates, diameters of pipes and materials. In the next step, the PSD of fluid is converted to PSD of thermal stress by the frequency transfer function. Finally, the PSD of thermal stress is transformed to time history of stress under an assumption of random phase. Fatigue damage factors can be evaluated from stress ranges and cycles obtained by the rain flow wave count method. Proposed method was applied to evaluate fatigue damage of piping junction model tests conducted at Oarai Engineering Center. Through comparison with direct evaluation from measurements and predictions by conventional methods, the accuracy of the proposed method was validated.Copyright © 2005 by ASME

14 citations

Journal ArticleDOI
TL;DR: In this article, the S-N curve of the driving wheel is estimated from the fatigue experiment on wheels, and the dynamic load time history influencing the wheel can be obtained from linear superposition of the dynamic loading time history and the static stress.
Abstract: A guideway vehicle is used in automobile, semiconductor and LCD manufacturing industries to transport products efficiently. Since the operating speed of the guideway vehicle should be increased for maximum productivity, the weight of the vehicle has to be reduced, and this weight reduction may cause a failure of a part in the system. Therefore, the estimation of the fatigue life of the parts becomes an important problem. In this study, the fatigue life of the wheels in the guideway vehicle is estimated using an S-N curve. To obtain the fatigue life of a part, the S-N curve, the dynamic stress time history applied to the part, and the material property of the part are required. The S-N curve of the driving wheel is obtained from the fatigue experiment on wheels. To obtain the material properties of the driving wheel, which is composed of aluminum with urethane coating, the result of a compression hardware test and static analysis of the wheel’s FE model are used. The dynamic stress time history influencing the driving wheel can be obtained from linear superposition of the dynamic load time history and the static stress. The dynamic load time history is estimated by multibody dynamic analysis, and the static stress is obtained by finite element analysis.

14 citations

Journal ArticleDOI
TL;DR: Based on the crack tip plasticity, a theoretical analysis has been performed and a model has been set up to consider the effect of the applied stress ratio on fatigue threshold as mentioned in this paper, which is very easy to use and no fatigue crack closure measurement is needed.

14 citations

Journal ArticleDOI
TL;DR: In this paper, an analytical modeling approach to characterize and understand high cycle fatigue life in gas turbine alloys is presented, where microstructural variables responsible for the scatter and developing analytical and semi-analytical models to quantitatively relate the variables to the response.
Abstract: This paper presents an analytical modeling approach to characterize and understand high cycle fatigue life in gas turbine alloys. It is recognized that the design of structures subjected to fatigue cannot be based on average material behavior but that designs must consider {minus}3{sigma} or some other appropriate extreme value (tail of the distribution) loading and/or material properties. Thus, a life prediction capability useful in a design application must address the scatter inherent in material response to fatigue loading. Further, the life prediction capability should identify the key micromechanical variables that are critical in the tail of the materials durability distribution. The proposed method addresses the scatter in fatigue by investigating the microstructural variables responsible for the scatter and developing analytical and semi-analytical models to quantitatively relate the variables to the response. The model is general and considers the entire range of damage accumulation sequences; from crack nucleation of the initially unflawed structure to final fast fracture.

14 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202355
2022125
202136
202035
201941
201855