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 authors focused on simulating durability test and evaluating low cycle fatigue life of the failed part of a cast iron cylinder head, and the simulation includes one pre-step as a determination of material grid and three steps as fluid, structural and fatigue analyses.
15 citations
TL;DR: In this paper, the authors proposed a novel fatigue model based on virtual strain energy, which separates loading paths based on their non-proportionality where directly takes into account the loading in fatigue life prediction.
15 citations
TL;DR: In this paper, the effect of variation in material properties on the fatigue life prediction of solder joints subjected to cyclic thermal loading was investigated, and the maximum creep strain was evaluated and incorporated into the modified Coffin-Manson equation to estimate the life cycles under thermal fatigue.
Abstract: A computational study is presented in this paper to investigate the effect of variation in material properties on the fatigue life prediction of solder joints subjected to cyclic thermal loading. The package under investigation was a plastic quad flat pack (PQFP) with gull‐wing leads. A commercial finite element code, ABAQUS, was employed to perform a two‐dimensional plane stress analysis. While all other constituents of the PQFP assembly were assumed to be linear elastic, the solder joint was considered to be elastic‐viscoplastic. The creep model was adopted from Norton’s equation and was implemented in the finite element analysis via a user‐defined subroutine. The maximum creep strain was evaluated and incorporated into the modified Coffin‐Manson equation to estimate the life cycles under thermal fatigue. It was found that the variation in material properties could have a significant influence on the fatigue life prediction of solder joints.
15 citations
TL;DR: In this article, a fatigue testing of turbine buckets, used in large steam turbines and generators, is described, where an electromagnetic drive is designed to produce the maximum force from a given-size magnet.
Abstract: Techniques are described for the fatigue testing of components, such as turbine buckets, used in large steam turbines and generators. Fatigue of these large structures, which have relatively high unit damping, is obtained through the use of resonant-vibration systems. An electromagnetic drive serves as the source of excitation. The drive system is designed to produce the maximum force from a given-size magnet. Control of the amplitudes of vibration, for very long periods, is obtained through the use of an automatic amplitude control, the stability of which maintains the amplitude with a variation of less than 2 percent.
15 citations
TL;DR: In this paper, the Virtual Crack Closure Technique (VCCT) is applied to a finite element (FE) model undergoing vibration fatigue to measure the crack length as a function of number of cycles.
15 citations