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 paper, the composite structures are usually subjected to fluctuating loads in service leading to fatigue failure, and it is one of the main failure modes, fatigue behavior of composites has been extensive.
Abstract: Composite structures are usually subjected to fluctuating loads in service leading to fatigue failure. Because it is one of the main failure modes, fatigue behavior of composites has been extensive...
15 citations
TL;DR: In this paper, a study of the thermal behavior of AISI 304 stressed by fatigue loads in high cycle fatigue testing at different frequency values, based on an energetic method to determine the fatigue curve, is presented.
15 citations
TL;DR: In this article, structural uncertainties are introduced into established fatigue design assessment process such as the ShipRight FDA3 procedure and the supporting software by Lloyd's Register, where a pseudo-excitation method is used to reflect the non-linear effect of ine...
Abstract: Today ship designers are facing ever more stringent safety and environmental requirements as well as economic ones. With the advancement of rules and procedures in the classification societies and the tailwind of modern computing technology, spectral fatigue based on first principles has become commonplace in ship design. So far the centrepiece of such a process is by and large a deterministic acceptance criterion despite the highly uncertain nature of the problem. As a result, the observed damage in a fatigue prone area is often significantly inconsistent with the predicted one, making client-facing a daunting task. As a small step towards a reliability-based solution, this paper attempts to introduce structural uncertainties into established fatigue design assessment process such as the ShipRight FDA3 procedure and the supporting software by Lloyd's Register. Key design parameters are randomised in a spectral fatigue model, where a pseudo-excitation method is used to reflect the non-linear effect of ine...
15 citations
TL;DR: In this paper, the simulation of rolling contact fatigue is conducted under spherical contact to predict a crack initiation life accurately, it is necessary to calculate contact stress and subsurface stresses accurately Contact stresses are obtained by contact analysis of a semi-infinite solid based on the use of influence functions and the subsural stress field is obtained using rectangular patch, solutions Based on these stress values, several multiaxial high-cycle fatigue criteria are used and the critical loads corresponding to fatigue limits are calculated.
Abstract: In this study, the simulation of rolling contact fatigue is conducted under spherical contact To predict a crack initiation life accurately, it is necessary to calculate contact stress and subsurface stresses accurately Contact stresses are obtained by contact analysis of a semi-infinite solid based on the use of influence functions and the subsurface stress field is obtained using rectangular patch, solutions Based on these stress values, several multiaxial high-cycle fatigue criteria are used and the critical loads corresponding to fatigue limits are calculated The criteria were classified into three categories, namely the critical plane approach, the stress invariant approach and the approach based on the mesoscopic scale The simulation results show that the critical load is decreasing rapidly and the site of crack initiation also moves rapidly to the surface from the subsurface when the friction coefficient exceeds a specific value for all three fatigue criteria Presented as a Society of Tribolo
15 citations
TL;DR: In this article, a phenomenological discrete material representation of a domain is represented by a collection of rigid elements that interact via springs along their boundaries and the principles of continuum damage mechanics are used to degrade the spring stiffnesses as brittle damage occurs when the domain is subjected to fatigue loading.
Abstract: Fatigue initiation and failure of various microelectromechanical systems (MEMS) is of significant importance as they gain widespread acceptance in sensors and electronics. This paper presents an approach for utilizing available experimental fatigue data to evaluate the fatigue lives of MEMS components. The approach is based on a phenomenological discrete material representation in which a domain is represented by a collection of rigid elements that interacts via springs along their boundaries. The principles of continuum damage mechanics are used to degrade the spring stiffnesses as brittle damage occurs when the domain is subjected to fatigue loading. The model utilizes experimental stress-life data for LIGA Ni to identify the material properties used in the model. The proposed model captures the statistical distribution of material properties and geometrical randomness of the microstructure commonly observed in a wide variety of MEMS. Consequently, simulations that account for the variability in fatigue life can be readily performed. The model is applied to a dog-bone-shaped specimen to evaluate the influence of material heterogeneity and material flaws on fatigue crack initiation life and scatter. The ability of the model to predict the fatigue life of different types of MEMS devices and loading conditions is also demonstrated by simulating the fatigue stress-life behavior of a MEMS resonator support beam.
15 citations