Author
S Narayanan
Bio: S Narayanan is an academic researcher from Indian Institutes of Technology. The author has contributed to research in topics: Vibration fatigue. The author has an hindex of 1, co-authored 1 publications receiving 6 citations.
Topics: Vibration fatigue
Papers
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01 Jul 2001
TL;DR: In this article, a gear box fitted in an armoured tracked vehicle for the purpose of power transmission and positioning of rotating heavy mass to the desired angle with high accuracy is subjected to fluctuating loads that are random in nature.
Abstract: The gears in a gear box fitted in an armoured tracked vehicle for the purpose of power transmission and positioning of rotating heavy mass to the desired angle with high accuracy are subjected to fluctuating loads that are random in nature. One of the important modes of failure in cyclic loading conditions including random loads is fatigue failure. It is thus important from the design point of view to estimate the life of the gears under these conditions. The fatigue life of components subjected to sinusoidal loading can be estimated by using cumulative damage theories. Their extension to random load fatigue, though straightforward, may not be very accurate owing to inherent scatter exhibited by the fatigue phenomenon. It is therefore necessary experimentally to determine the fatigue life of randomly loaded components and establish the validity of the theoretical model. An electrohydraulic test rig has been designed and fabricated that is capable of generating different types of load pattern by ad...
6 citations
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TL;DR: In this article, a crack initiation life prediction methodology for the tooth bending fatigue of hypoid gears is proposed, which employs a previously developed finite-element based hypoid gear root stress model (Hotait et al. 2011) to establish the multiaxial stress time histories within the root fillet regions.
Abstract: In this study, a crack initiation life prediction methodology for the tooth bending fatigue of hypoid gears is proposed. This methodology employs a previously developed finite-element based hypoid gear root stress model (Hotait et al. 2011, “An Investigation of Root Stresses of Hypoid Gears with Misalignments,” ASME J. Mech. Des., 133, p. 071006) of face-milled and face-hobbed hypoid gears to establish the multiaxial stress time histories within the root fillet regions. These stress time histories are combined with a multiaxial crack initiation fatigue criterion to predict life distributions along roots of the pinion and the gear. The predictions of the multiaxial fatigue model are compared to those from a conventional uniaxial fatigue model to establish the necessity for a multiaxial approach. The model is exercised with an example face-milled hypoid gear set from an automotive application to demonstrate the impact of various misalignments well as the key cutting tool parameters on the resultant tooth bending lives.
11 citations
TL;DR: In this article, a finite element method is implemented to model stranded-wire helical springs under different loading conditions, and finite element results are coupled with multiaxial fatigue criteria.
Abstract: In this paper, finite element method is implemented to model stranded-wire helical springs under different loading conditions. Finite element results are coupled with multiaxial fatigue criteria su...
4 citations
01 Jan 2011
TL;DR: In this article, the influence of misalignments on Gear Bending Stresses has been investigated and the effect of Misalignments have been found to be a significant influence on the performance of these models.
Abstract: .................................................................................................................................... ii DEDICATION ................................................................................................................................ iv ACKNOWLEDGMENTS ............................................................................................................... v VITA ............................................................................................................................................... vi PUBLICATIONS ............................................................................................................................ vi FIELDS OF STUDY....................................................................................................................... vi TABLE OF CONTENTS ............................................................................................................... vii LIST OF TABLES .......................................................................................................................... xi LIST OF FIGURES ....................................................................................................................... xii NOMENCLATURE ...................................................................................................................... xx TOOTH NOMENCLATURE ...................................................................................................... xxv CHAPTER 1 1.1 Background and Motivation .................................................................................................... 1 1.2 Literature Review..................................................................................................................... 4 1.2.1 Gear Root Stresses Prediction Models ............................................................................... 4 1.2.2 Influence of Misalignments on Gear Bending Stresses ..................................................... 7 viii 1.2.3 Gear Bending Fatigue Models ........................................................................................... 8 1.3 Scope and Objectives ............................................................................................................. 11 1.4 Dissertation Outline ............................................................................................................... 13 CHAPTER 2 2.
3 citations
TL;DR: Based on the finite element procedure and the partial damage model, this method inserts the non-local strain's definition formula into the loading function and damage rate increment formula, from this method, the nonpartial gradient enhancement damage model is obtained.
Abstract: The traditional methods for the prediction of fatigue life of metallic material consider only the two processes of fatigue initiation and fatigue cracking, while the process from fatigue cracking to breaking has been neglected. This paper provides one new method of estimating the fatigue life of under-constant-amplitude loading spectrum---non-local gradient damage enhancement model method. Based on the finite element procedure and the partial damage model, this method inserts the non-local strain's definition formula into the loading function and damage rate increment formula. From this method, the non-partial gradient enhancement damage model is obtained. In this model, the material’s microscopic criterion factor and the material’s damage criterion have been considered, the process of endurance failure is also considered. Thus, the insufficiency of traditional research techniques is effectively avoided, the actual effect analysis of metallic material is more reasonable, and the actual operating mode is been conformed to.
1 citations
Journal Article•
TL;DR: In this article, the bending fatigue strength of spur gears in low-cycle range was investigated and the validity of these calculating methods was confirmed by carrying out a static loading test. And the characteristics of bending fatigue in spur gears were clarified to a considerable extent by a bending fatigue test.
Abstract: This paper presents a study on bending fatigue strength of spur gears in low-cycle range. The calculating methods for adjacent-tooth gaps and the circumferential load, under which adjacent-tooth contacts occur due to the deflections of meshing teeth, are introduced. The validity of these calculating methods is confirmed by carrying out a static loading test. The characteristics of the bending fatigue strength of spur gears in low-cycle range are clarified to a considerable extent by carrying out a bending fatigue test.