Topic
Vibration fatigue
About: Vibration fatigue is a research topic. Over the lifetime, 3460 publications have been published within this topic receiving 46297 citations.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this paper, a linear damage rule was used to estimate the fatigue life of an air- craft engine by considering the load spectrum difference factor, and a good agreement was found between the estimated results and real life data.
Abstract: Aircraft engine components are subjected to variable amplitude load conditions usually they tend to ex- perience fatigue damage. Many fatigue damage accumula- tion theories have been put forward to predict the fatigue lives of structure components. Under different load spectra, the aircraft engine has different working life. In this paper, based on the linear damage rule, the fatigue life of an air- craft engine was estimated by considering the load spectrum difference factor. According to one aircraft engine used for different load spectrums, the relationship between the load spectrum and the life is discussed. Moreover, the fatigue life of this engine used in A-type bomber is estimated based on the different load spectrum of the B-type bomber. A good agreement is found between the estimated results and real life data.
24 citations
••
TL;DR: In this paper, the effects of multiple laser peening (LP) on the vibration fatigue properties and microstructural evolution of TC6 titanium alloy were investigated, while the measurements of residual stress and microhardness were carried out.
Abstract: In this study, typical TC6 titanium alloy was taken to investigate the effects of multiple laser peening (LP) on the vibration fatigue properties and microstructural evolution. The vibration fatigue experiments were conducted, while the vibration fatigue life of the specimens before and after LP was compared and the fracture morphologies were observed by scanning electron microscopy (SEM). In addition, the measurements of residual stress and microhardness were carried out. The microstructures produced by different treatments were also characterized by transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD). The experimental results indicated that multiple LP could indeed enhance the vibration fatigue properties of TC6 titanium alloy. Comparing with the investigated specimen without LP, the vibration fatigue life of the specimen subjected to 5 times LP increased by 105.2%. Meanwhile, after 5 times LP, the surface residual stress transformed from tensile stress (+26 MPa) to compressive stress (−485 MPa), and the surface microhardness was 428 HV, which increased by 32.9% compared with the untreated sample. Additionally, high-density of dislocation and deformation twin were also generated after multiple LP. The improvement of vibration fatigue properties was attributed to the rewarding compressive residual stress and the beneficial microstructural evolution induced by multiple LP.
24 citations
••
TL;DR: In this article, an advanced model of alongwind-induced fatigue damage and using a probabilistic assessment of the parameters involved are discussed and propagated the uncertainties inherent in the input parameters over the fatigue damage prediction.
24 citations
••
TL;DR: In this paper, an innovative three-dimensional plastic-damage model is proposed to describe the behavior of concrete material under fatigue loading, where two damage variables are defined to describe fatigue degradation of the mechanical properties of concrete under tension and shear, respectively.
Abstract: In this paper, an innovative three-dimensional plastic-damage model is proposed to describe the behavior of concrete material under fatigue loading. In the proposed model, two damage variables are defined to describe the fatigue degradation of the mechanical properties of concrete under tension and shear, respectively. Meanwhile, by adopting the elastoplastic damage energy release rates, which are derived from the elastoplastic Helmholtz free energy potentials, a novel fatigue damage evolution law is developed. Specifically, the damage evolution process is governed by the competition between the damage healing effect and the damage driving effect induced by the propagation and closure of micro cracks under fatigue loading. The proposed model also allows the accumulation of fatigue damage within the classical damage surface by adopting the loading/unloading irreversibility concept. Moreover, the evolution of plastic strains is considered within the framework of the effective stress space plasticity. In the...
24 citations
••
TL;DR: In this paper, a wavelet transform (WT) based method was proposed to extract fatigue damage parts from the stress-time history and generate the edited stress time history with shorter time length.
24 citations