Phan Van Hien

Bio: Phan Van Hien is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 4 citations.

Estimation of Bending Fatigue Life of Hypoid Gears Using a Multiaxial Fatigue Criterion

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.

Bending fatigue testing of gear teeth under random loading

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...

Design of welded structures working under random loading

Abstract: This paper presents a design method for prediciting the fatigue life of T-joint assemblies loaded by random loads, based on a statistical analysis of tests. This sduty was on the correclation between the types of loading observed in practive and test results obtained for fatigue life determination. The work follows three steps: analysis tof the statistical distributions of random loads that illustrate extremen value from Markov matrix representations; statistical analysis of lifetimes obtained when the specimens are sbumitted to random loads defined earlier; design of a set of endurance curves [stress-number of cycles to failure (S-N) curves], called ‘random’ S-N curves. These SN curves. These S-N curves are shifted compared with that obtained under sinusoidal loading. Random S-N curve positions in the S-N plane are obtimized depending on the lifetime able to take into account the damege due to the small cycles that are often present in actual loading. The use of random S-N curves for fatigue life...

A Theoretical and Experimental Investigation on Bending Strength and Fatigue Life of Spiral Bevel and Hypoid Gears

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.