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  • 1
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    Contact and Bending Durability Calculation for Spiral-Bevel Gears (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The objective of this project is to extend the capabilities of the gear contact analysis solver Calyx, and associated packages Transmission3D, HypoidFaceMilled, HypoidFaceHobbed. A calculation process for the surface durability was implemented using the Dowson-Higginson correlation for fluid film thickness. Comparisons to failure data from NASA's Spiral Bevel Gear Fatigue rig were carried out. A bending fatigue calculation has been implemented that allows the use of the stress-life calculation at each individual fillet point. The gears in the NASA test rig did not exhibit any bending fatigue failure, so the bending fatigue calculations are presented in this report by using significantly lowered strength numbers.
    Keywords: Mechanical Engineering
    Type: NASA/CR-2016-219112 , E-19235 , GRC-E-DAA-TN31732
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Friction Stir Welding Development at National Aeronautics and Space Administration-Marshall Space Flight Center (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: This paper presents an over-view of friction stir welding (FSW) process development and applications at Marshall Space Flight Center (MSFC). FSW process development started as a laboratory curiosity but soon found support from many users. The FSW process advanced very quickly and has found many applications both within and outside the aerospace industry. It is currently being adapted for joining key elements of the Space Shuttle External Tank for improved producibility and reliability. FSW process modeling is done to better understand and improve the process. Special tools have been developed to weld variable thickness materials including very thin and very thick materials. FSW is now being applied to higher temperature materials such as copper and to advanced materials such as metal matrix composites. FSW technology is being successfully transferred from MSFC laboratory to shop floors of many commercial companies.
    Keywords: Mechanical Engineering
    Type: TMS Conference; Nov 01, 2001; Indianapolis, IN; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Dynamic Response of a Planetary Gear System Using a Finite Element/Contact Mechanics Model (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The dynamic response of a helicopter planetary gear system is examined over a wide range of operating speeds and torques. The analysis tool is a unique, semianalytical finite element formulation that admits precise representation of the tooth geometry and contact forces that are crucial in gear dynamics. Importantly, no a priori specification of static transmission error excitation or mesh frequency variation is required; the dynamic contact forces are evaluated internally at each time step. The calculated response shows classical resonances when a harmonic of mesh frequency coincides with a natural frequency. However, peculiar behavior occurs where resonances expected to be excited at a given speed are absent. This absence of particular modes is explained by analytical relationships that depend on the planetary configuration and mesh frequency harmonic. The torque sensitivity of the dynamic response is examined and compared to static analyses. Rotation mode response is shown to be more sensitive to input torque than translational mode response.
    Keywords: Mechanical Engineering
    Type: AD-A386731 , ARO-40056.5-EG-YIP , Transactions of the ASME; 122; 304-310
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Friction Stir Welding Development at NASA-Marshall Space Flight Center (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper presents an overview of friction stir welding (FSW) process development and applications at Marshall Space Flight Center (MSFC). FSW process development started as a laboratory curiosity but soon found support from many users. The FSW process advanced very quickly and has found many applications both within and outside the aerospace industry. It is currently being adapted for joining key elements of the Space Shuttle External Tank for improved producibility and reliability. FSW process modeling is done to better understand and improve the process. Special tools have been developed to weld variable thickness materials including thin and thick materials. FSW is now being applied to higher temperature materials such as copper and to advanced materials such as metal matrix composites. FSW technology is being successfully transferred from MSFC laboratory to shop floors of many commercial companies.
    Keywords: Mechanical Engineering
    Type: TMS Special Publication on Friction Stir Welding; Jan 01, 2001; Warrendale, PA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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