2 edition of Three-dimensional gear crack propagation studies found in the catalog.
Three-dimensional gear crack propagation studies
by National Aeronautics and Space Administration, Lewis Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], [Springfield, Va
Written in English
|Other titles||Three dimensional gear crack propagation studies.|
|Statement||David G. Lewicki ... [et al.].|
|Series||NASA/TM -- 1998-208827., NASA technical memorandum -- 208827.|
|Contributions||Lewicki, David G., Lewis Research Center.|
|The Physical Object|
Crack propagation paths were predicted for a variety of gear tooth and rim configurations. The effects of rim and web thicknesses, initial crack locations, and gear tooth geometry factors such as diametral pitch, number of teeth, pitch radius, and tooth pressure angle were considered. Three-dimensional gear crack propagation studies [microform] / David G. Lewicki [et al.] Effect of speed (centrifugal load) on gear crack propagation direction [microform] / David G. Lewicki; Investigation of the effects of manufacturing variations and materials on fatigue crack detection method.
Gear Crack Propagation Investigation Reduced weight is a major design goal in aircraft power transmissions. Some gear designs incorporate thin rims to help meet this goal. Thin rims, however, may lead to bending fatigue cracks. These cracks may propagate through a gear tooth or into the gear rim. A. Numerical Simulation of Crack Propagation. Meinhard Kuna. Pages Practical Applications. Meinhard Kuna. Pages Back Matter. Pages PDF. About this book. Introduction. Fracture mechanics has established itself as an important discipline of growing interest to those working to assess the safety, reliability and service.
Gear Crack Propagation Investigations David G. Lewicki VehiclePropulsion Directorate Fatigue Crack Growth: Manymachineelements,suchas gear teeth,are cyclicly loadedin In addition, Elber defined U through experimental studies as a. Abstract: Based on the linear-elastic fracture theory, the fracture damage of gear structure is studied. By using the professional fracture analysis software FRANC3D, a three-dimensional propagation analysis is investigated for tooth root crack in involute gear, and also solving the three types of stress intensity factor(SIF) in tooth root semicircle crack tip, its changing rule and the 3D.
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Three-Dimensional Gear Crack Propagation Studied Gears used in current helicopters and turboprops are designed for light weight, high margins of safety, and high reliability. However, unexpected gear failures may occur even with adequate tooth design.
To design an extremely safe system. split-tooth gear. A specially developed three-dimensional crack analysis program was used which was based on boundary element modeling and principles of linear elastic fracture mechanics.
The effect of the location of initial cracks on crack propagation was evaluated. Crack growth simulation was performed on a case study to evaluateAuthor: David G. Lewicki, Ashok D. Sane, Raymond J. Drago, Paul A. Wawrzynek. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.
Three-Dimensional Analysis of Crack Growth (Topics in Engineering, 28) [Mi, Y.] on *FREE* shipping on qualifying offers. Three-Dimensional Analysis of Crack.
Three-dimensional crack growth simulation was performed on a split-tooth gear design using boundary element modeling and linear elastic fracture mechanics. Initial cracks in the fillet of the teeth produced stress intensity factors of greater magnitude (and thus, greater crack growth rates) than those in the root or groove areas of the teeth.
Three-dimensional gear crack propagation studies. [Cleveland, Ohio]: [Springfield, Va: National Aeronautics and Space Administration, Lewis Research Center ; National Technical Information Service, distributor.
MLA Citation. Lewicki, David G. and Lewis Research Center. Three-dimensional gear crack propagation studies [microform] / David G. Audio Books & Poetry Community Audio Computers, Technology and Science Music, Arts & Culture News & Public Affairs Non-English Audio Spirituality & Religion.
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Three-dimensional finite element analyses were conducted to study both fatigue crack initiation and fatigue crack propagation in a gear tooth. Linear elastic fracture mechanics approach was employed here to model mixed-mode fatigue crack propagation in a gear tooth after a fatigue crack Cited by: Figs.
1 and 2 illustrate the developed three-dimensional models of a gear tooth for studying fatigue crack initiation and fatigue crack propagation respectively. A type of isotropic 8-node-solid. Finite-deformation irreversible cohesive element for three-dimensional crack-propagation analysis Article (PDF Available) in International Journal for Numerical Methods in Engineering 44(9) A three-dimensional linear elastic fracture mechanics based software; FRANC3D has been adopted to obtain the crack propagation path in a spur gear tooth root under influence of varying gear : Vivek Patil, Vaibhav Chouhan, Yogesh Pandya.
A rapidly moving crack in a brittle material is often idealized1 as a one-dimensional object with a singular tip, moving through a two-dimensional material. However, in real three-dimensional Cited by: A study to determine the effect of moving gear tooth load on crack propagation predictions was performed.
Two-dimensional analysis of an involute spur gear and three-dimensional analysis of a spiral-bevel pinion gear using the finite element method and boundary element method were studied and compared to by: This paper reviews published papers on the dynamics of cracked gear systems.
These studies mainly focused on three topics: crack propagation prediction, time-varying mesh stiffness (TVMS) calculation and vibration response calculation; Study objects involve the spur gear, helical gear and planetary gear; Different modeling methods including analytical method, finite element (FE) method, combined Cited by: failure modes considering gear tooth fracture, by studying the crack propagation path in a spur gear.
Crack propagation paths are predicted for a variety of gear tooth geometry at various crack initiation location. The effects of gear tooth thickness, pitch radius, and tooth pressure angle are Size: 1MB.
Based on the linear-elastic fracture theory, the fracture damage of gear structure is studied. By using the professional fracture analysis software FRANC3D, a three-dimensional propagation analysis is investigated for tooth root crack in involute gear, and also solving the three types of stress intensity factor(SIF) in tooth root semicircle crack tip, its changing rule and the 3D stress Cited by: 2.
Generally, the prediction of crack propagation studies was carried out using a three-dimensional (3D) finite element (FE) model in literature with uniform / parabolic load distribution on the contact line along the face : Rama Thirumurugan, N.
Gnanasekar. This paper analyzed the deformations and bending stresses of a three-dimensional (3D), thin-rimmed gear (TRG) through using the finite element method (FEM) and a whole gear deformation model. The gear’s deformations and stresses at every part are analyzed in by: Linear elastic fracture mechanics A large ﬁeld of fracture mechanics uses concepts and theories in which linear elastic material behavior is an essential assumption.
This is the case for Linear Elastic Fracture Mechanics (LEFM). Prediction of crack growth can be File Size: 1MB. In book: Hydraulic Fracturing in Unconventional Reservoirs, pp Numerical simulation of hydraulic fracture crack propagation.
February Moscow University Mechanics Bulletin. A gear is a critical component and can be found in many industrial applications. This investigation develops a three dimensional finite element spur gear model to calculate the contact stress on.Analytical and experimental studies were performed to investigate the effect of gear rim thickness on crack propagation life.
The FRANC (FRacture ANalysis Code) computer program was used to.Bordas S, Rabczuk T and Zi G Three-dimensional crack initiation, propagation, branching and junction in non-linear materials by an extended meshfree method without asymptotic enrichment Eng. Fract. Mech. 75 Crossref Google ScholarCited by: 7.