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 average stress of the hysteresis loop was taken into account by means of Walker's model and the implicit gradient method was adopted for the numerical evaluation of the effective stress and strain at low and medium cycle fatigue life and was then related to the fatigue strength of the material.
22 citations
TL;DR: In this paper, an energy-based model for predicting fatigue life and evaluation of progressive damage in a full composite wind turbine blade is proposed based on the assumption that the damage growth rate in a composite material depends on the maximum value of elastic strain energy per cycle.
Abstract: In this article, an energy-based model for predicting fatigue life and evaluation of progressive damage in a full composite wind turbine blade is proposed. It is based on the assumption that the damage growth rate in a composite material depends on the maximum value of elastic strain energy per cycle. Design, finite ele- ment modeling, and dynamic analysis of the blade have been performed using ANSYS software. The first five natural frequencies and mode shapes of the blade were calcu- lated and dangerous nodes in the critical location were determined using the modal and harmonic analysis techniques. Obtaining critical stresses from ANSYS analysis, fatigue life of the blade at the first natural resonance frequency was estimated by the model. Results showed that the calculated life of the analyzed blade could meet the design requirement.
22 citations
TL;DR: In this article, the authors developed a simulation program, CP-System, for multiple cracks propagating in a three-dimensional stiffened panel structure, where through-the-thickness crack propagation is formulated as a two-dimensional in-plane problem, and the crack propagation behavior is simulated by step-by-step finite element analyses.
Abstract: The authors have developed a simulation program, CP-System, for multiple cracks propagating in a three-dimensional stiffened panel structure, where through-the-thickness crack propagation is formulated as a two-dimensional in-plane problem, and the crack propagation behavior is simulated by step-by-step finite element analyses. In order to evaluate the fatigue lives of marine structures accurately, it is necessary to take into account the load histories induced by sea waves, which may be composed of a random sequence of certain clustered loads with variable stress range. In the proposed crack growth model, the crack opening and closure behavior is simulated by using the modified strip yielding model, and the effective tensile plastic stress intensity range, ΔK RP, is calculated by considering the contact of plastic wake along the crack surfaces. The adequacy of the proposed crack growth model is examined by comparison with fatigue tests under non-constant-amplitude loading. The usefulness of the developed method is demonstrated for a ship structural detail under certain simulated load sequences. It is shown that the fatigue crack growth of a ship structure is significantly retarded due to the load interaction effects, so that the conventional method for fatigue life assessment may predict a relatively conservative fatigue life of a structure.
22 citations
23 Oct 2013
TL;DR: In this paper, a non-linear fatigue damage accumulation model for fatigue life prediction under variable loading was proposed. But, the model is not suitable for the case where the material property deteriorates continuously.
Abstract: Fatigue is a damage accumulation process in which material property deteriorates continuously. For the usual failure mode of mechanical components under vari-able loading, fatigue life prediction issues are very impor-tant for selection, design, and safety assessments of these components. Based on continuum damage mechanics theory, this paper presents a new non-linear fatigue dam-age accumulation model for fatigue life prediction under variable loading. The proposed model has been formulated to take the damage evolution of material and the effects of loading sequence on fatigue life under dif-ferent loading conditions into account. Moreover, it con-siders the mean stress effects through characterizing the damage evolution of materials with fewer parameters. Experimental data of 30NiCrMoV12 and 30CrMnSiA under two-stress level loading from literature were used to verify the proposed model. Predicted fatigue lives using the proposed model show a good agreement with the reported experimental data. DOI: http://dx.doi.org/10.5755/j01.mech.19.5.5541
22 citations
TL;DR: In this paper, two fatigue effects, namely number of stress cycles and equivalent stress amplitude, were introduced as investigated parameters in a bridge and investigated their relationship with traffic volume and ambient temperature by using 7-months fatigue monitoring data of an actual bridge.
Abstract: Fatigue has gradually become a serious issue for orthotropic steel deck used for long-span bridges. Two fatigue effects, namely number of stress cycles and equivalent stress amplitude, were introduced as investigated parameters in this paper. Investigation was focused on their relationships with traffic volume and ambient temperature by using 7-months fatigue monitoring data of an actual bridge. A fatigue analytical model considering temperature-induced changes in material property of asphalt pavement was established for verifying these relationships. The analysis results revealed that the number of stress cycles and equivalent stress amplitude showed a linear correlation with the traffic volume and ambient temperature, respectively, and that the rib-to-deck welded joint was much more sensitive to the traffic volume and ambient temperature than the rib-to-rib welded joint. The applicability of the code-recommended model for fatigue vehicle loading was also discussed, which revealed that the deterministic vehicle loading model requires improvement to account for significant randomness of the actual traffic conditions.
22 citations