Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 166
Book Description
NASA Langley Scientific and Technical Information Output-2001
Author: Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1046
Book Description
NASA Langley Scientific and Technical Information Output 2000
Author: Evaluating the effectiveness of the 2000-2001 NASA "Why?" Files Program
Author: Publisher: DIANE Publishing
ISBN: 1428925759
Category :
Languages : en
Pages : 66
Book Description
Launch Vehicle Design Process: Characterization, Technical Integration, and Lessons Learned
Author: J. C. BlairScientific and Technical Aerospace Reports
Author: National Educators Workshop, Update 2001
Author: The First SIMBIOS Radiometric Intercomparison (SIMRIC-1), April-September 2001
Author: SIMBIOS Project 2001 Annual Report
Author: Giulietta S. FargionPublisher:
ISBN:
Category : Oceanography
Languages : en
Pages : 196
Book Description
Gear Crack Propagation Path Studies: Guidelines for Ultra-Safe Design
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Book Description
Design guidelines have been established to prevent catastrophic rim fracture failure modes when considering gear tooth bending fatigue. Analysis was performed using the finite element method with principles of linear elastic fracture mechanics. 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. Design maps of tooth/rim fracture modes including effects of gear geometry, applied load, crack size, and material properties were developed. The occurrence of rim fractures significantly increased as the backup ratio (rim thickness divided by tooth height) decreased. The occurrence of rim fractures also increased as the initial crack location was moved down the root of the tooth. Increased rim and web compliance increased the occurrence of rim fractures. For gears with constant pitch radii, coarser-pitch teeth increased the occurrence of tooth fractures over rim fractures. Also, 250 pressure angle teeth had an increased occurrence of tooth fractures over rim fractures when compared to 200 pressure angle teeth. For gears with constant number of teeth or gears with constant diametral pitch, varying size had little or no effect on crack propagation paths.