This paper presents a review of the major fatigue models and life time prediction methodologies for fibrereinforced polymer composites, subjected to fatigue loadings. In this review, the fatigue models have been classified in three major categories: fatigue life models, which do not take into account the actual degradation mechanisms but use S-N curves or Goodman-type diagrams and introduce som...

This paper did a radial compression fatigue test on glass fiber winding composite tubes, collects acoustic emission signals on different fatigue damages stages, used time frequency analysis techniques of modern wavelet transform, and analyzed the wave form and frequency characteristics of fatigue damaged acoustic emission signals. Three main frequency bands of acoustic emission signal had been ...

The effect of tension-tension fatigue (T-T) on carbon/epoxy composites (CFC) has been investigated in this paper. Load controlled fatigue tests were conducted in the tension-tension (T-T) cyclic mode with the R-ratio values of 0.1 and 0.3 and subsequently the specimens with the fatigue life over 10 cycles have been studied by means of tensile testing, ultrasonic inspection and quantitative data...

The paper presents the concept and experimental validation of an analytical tool for fatigue damage monitoring in polycrystalline alloys. Ultrasonic signals are utilized for early detection of fatigue damage during the crack initiation period. Small microstructural changes occurring inside the material during the initial stages of fatigue damage cause attenuation and distortion of transmitted w...

This paper describes a technique to identify the important features in fatigue road load data that cause the majority of the total damage. Fatigue damaging events, called bumps, are extracted from the original road load time history using a wavelet-based algorithm, called Wavelet Bump Extraction (WBE). WBE can be used to produce a mission signal that retains most of the fatigue damage whilst pr...

objectives: skeletal-muscular disorders affect the biomechanics of the human body, especially the lower extremity, with a negative effect on the biomechanics of exercise. the main aim of this study was to evaluate the effect of fatigue on the kinematic variables of knee joints during countermovement jumps in female students of physical education with valgus knee deformity.  methods: fifteen sub...