Journal ArticleDOI
Life prediction methodology for GFRP laminates under spectrum loading
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TLDR
In this paper, a complete life prediction methodology for glass fiber reinforced plastic laminates accounting for plane stress states and spectrum loading is presented, where Fatigue strength allowables in the laminate symmetry axes are derived by direct characterization for a number of different constant amplitude loading cases.Abstract:
A complete life prediction methodology for glass fiber reinforced plastic laminates accounting for plane stress states and spectrum loading is presented in this paper. Fatigue strength allowables in the laminate symmetry axes are derived by direct characterization for a number of different constant amplitude loading cases. Experimental results from tests inducing plane stress states, conducted using two different loading spectra of variable amplitude, were used to validate the entire methodology. The first loading spectrum is a modified version of the well known in wind turbine rotor blade research activities, WISPERX, while the second one is derived through aeroelastic simulations of a realistic loading case for a small glass fiber reinforced polyester rotor blade. The effectiveness of the methodology is investigated and correlated to several parameters that affect life prediction, such as, type of loading, baseline data, damage accumulation rule, etc.read more
Citations
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Journal ArticleDOI
Modeling the variable amplitude fatigue of composite materials: A review and evaluation of the state of the art for spectrum loading
TL;DR: In this paper, the experimental research and modeling of fiber reinforced polymer composite materials subjected to variable amplitude fatigue is reviewed and compared by applying them to four material systems for which extensive fatigue data was available.
Fatigue life prediction and strength degradation of wind turbine rotor blade composites
TL;DR: In this article, the authors compared the Miner's sum method and strength-based life prediction for wind turbine rotor rotor blades, and showed that the residual strength of rotor blades degrades after fatigue for a range of load conditions.
Journal ArticleDOI
Artificial neural networks in spectrum fatigue life prediction of composite materials
Anastasios P. Vassilopoulos,Efstratios F. Georgopoulos,Efstratios F. Georgopoulos,Vasileios Dionysopoulos +3 more
TL;DR: In this paper, an artificial neural network has been used for modeling fatigue life of multidirectional composite laminates made of GFRP composite materials and tested under constant amplitude loading patterns.
Journal ArticleDOI
Influence of the constant life diagram formulation on the fatigue life prediction of composite materials
TL;DR: In this article, the influence of the constant life diagram (CLD) formulation on the fatigue life prediction of composite materials was examined, and the results revealed that the simple piecewise linear formulation compares favorably to other more sophisticated and complicated schemes.
Journal ArticleDOI
The selection of a suitable maintenance strategy for wind turbines.
TL;DR: In this paper, a hybrid of an RCM approach and asset life cycle analysis technique is applied to Horizontal-Axis Wind Turbines to identify possible failure modes, causes and the resultant effects on system operation.
References
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Journal ArticleDOI
Cumulative Damage Models and Multi-Stress Fatigue Life Prediction:
Woonbong Hwang,K.S. Han +1 more
TL;DR: In this paper, three different cumulative damage models were defined using several physical variables such as fatigue modulus and resultant strain, and the proposed models were derived as functions of nor malized applied stress level, r, and number of fatigue cycle, n.
Journal ArticleDOI
Life prediction for fatigue of T800/5245 carbon-fibre composites: I. Constant-amplitude loading
TL;DR: In this paper, a study of the fatigue behavior of a laminate of the T800/5245 composite system was presented, where the fatigue response in repeated tension, repeated compression, and mixed tension-compression was determined at constant stress levels over a wide range of R values, and the results were analyzed in terms of constant-life diagrams of the kind that can be used to provide design data.
Book ChapterDOI
Life Prediction for Resin-Matrix Composite Materials
TL;DR: In this article, various methods for predicting the fatigue life of resin-matrix composite materials are reviewed, including empirical, residual strength degradation, stiffness degradation, and actual damage state based theories.
Journal ArticleDOI
Life Prediction Methodology for Composite Structures. Part II—Spectrum Fatigue:
TL;DR: In this article, a model for predicting the life of composite structures under constant amplitude and two-stress level fatigue loadings is extended and applied to structures subjected to randomly-ordered loading spectra.
Journal ArticleDOI
Fatigue Strength Prediction under Multiaxial Stress
TL;DR: In this article, a multiaxial fatigue failure criterion for composite materials is presented along with an assessment of the capability it offers for design under multi-axial constant or variable amplitude stresses.