Topic
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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TL;DR: In this article, the bearing steel microstructure is modeled as randomly generated Voronoi tessellations wherein each cell represents a material grain and the boundaries between them constitute the weak planes in the material.
Abstract: Rolling contact fatigue of rolling element bearings is a statistical phenomenon that is strongly affected by the heterogeneous nature of the material microstructure. Heterogeneity in the microstructure is accompanied by randomly distributed weak points in the material that lead to scatter in the fatigue lives of an otherwise identical lot of rolling element bearings. Many life models for rolling contact fatigue are empirical and rely upon correlation with fatigue test data to characterize the dispersion of fatigue lives. Recently developed computational models of rolling contact fatigue bypass this requirement by explicitly considering the microstructure as a source of the variability. This work utilizes a similar approach but extends the analysis into a 3D framework. The bearing steel microstructure is modeled as randomly generated Voronoi tessellations wherein each cell represents a material grain and the boundaries between them constitute the weak planes in the material. Fatigue cracks initiate on the weak planes where oscillating shear stresses are the strongest. Finite element analysis is performed to determine the magnitude of the critical shear stress range and the depth where it occurs. These quantities exhibit random variation due to the microstructure topology which in turn results in scatter in the predicted fatigue lives. The model is used to assess the influence of (1) topological randomness in the microstructure, (2) heterogeneity in the distribution of material properties, and (3) the presence of inherent material flaws on relative fatigue lives. Neither topological randomness nor heterogeneous material properties alone account for the dispersion seen in actual bearing fatigue tests. However, a combination of both or the consideration of material flaws brings the model’s predictions within empirically observed bounds. Examination of the critical shear stress ranges with respect to the grain boundaries where they occur reveals the orientation of weak planes most prone to failure in a three-dimensional sense that was not possible with previous models.
34 citations
TL;DR: In this article, the effects of load variations on fatigue damage and crack growth were extensively reviewed, and it was confirmed that the range-pair counting or the rain-flow counting method should be employed when estimating fatigue lives under variable amplitude loading.
34 citations
TL;DR: In this paper, a new vibration-based fatigue testing methodology for assessing high-cycle turbine engine material fatigue strength at various stress ratios is presented, where the idea is to accumulate fatigue energy on a baseexcited plate specimen at high frequency resonant modes and to complete a fatigue test in a much more efficient way at very low cost.
Abstract: A new vibration-based fatigue testing methodology for assessing high-cycle turbine engine material fatigue strength at various stress ratios is presented. The idea is to accumulate fatigue energy on a base-excited plate specimen at high frequency resonant modes and to complete a fatigue test in a much more efficient way at very low cost. The methodology consists of (1) a geometrical design procedure, incorporating a finite-element model to characterize the shape of the specimen for ensuring the required stress state/ pattern; (2) a vibration feedback empirical procedure for achieving the high-cycle fatigue experiments with variable-amplitude loading; and finally (3) a pre-strain procedure for achieving various uniaxial stress ratios. The performance of the methodology is demonstrated with experimental results for mild steel, 6061-T6 aluminum, and Ti-6Al-4V plate specimens subjected to a fully reversed bending, uniaxial stress state.
34 citations
TL;DR: In this article, a simple prediction scheme correlating fatigue life to the thermal degradation of fatigue strength was presented, and the load frequency effect on the fatigue life of an AS4/PEEK ±45 thermoplastic composite laminate was investigated at 1 Hz, 5 Hz and 10 Hz.
Abstract: This paper presents a simple prediction scheme correlating fatigue life to the thermal degradation of fatigue strength. Shifting factors similar to the time-temperature shifting in viscoelastic media were employed to account for the effect of temperature on fatigue strength and an iso-strength plot was introduced for fatigue life prediction under non-isothermal conditions. The scheme presented in this paper can predict the load frequency effect associated with hysteretic heating from limiting basic material information. The load frequency effect on the fatigue life of an AS4/PEEK ±45 thermoplastic composite laminate was investigated at 1 Hz, 5 Hz and 10 Hz. Fatigue life prediction for 5 Hz and 10 Hz based on S-N data at 1 Hz was also demonstrated. The predictions agreed reasonably with the experimental data.
34 citations
TL;DR: In this paper, the authors investigated the relationship between modal properties of single lap joints and the cyclic-vibration-peel loading and carried out vibration fatigue tests and subsequent modal response measurements using steel-aluminum SLJ specimens.
34 citations