Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Influence of the defect size on the tooth root load carrying capacity
KTH, School of Industrial Engineering and Management (ITM).
2016 (English)In: AGMA 2016 - Fall Technical Meeting, AGMA American Gear Manufacturers Association , 2016Conference paper, Published paper (Refereed)
Abstract [en]

In order to increase the power density of gears, a high level of information concerning the load carrying capacity is necessary. Calculation methods for the flank and tooth root load carrying capacity are well-established in the industry and are an important tool for the gear design engineer. The existing methods cover various types of gears, such as cylindrical, bevel, or beveloid gears. Calculating the flank and tooth root load carrying capacity for various gear types relies either on analytical formulae (Hertzian theory, fixed beam) or on results of FE-based tooth contact analysis software. The existing calculation methods for the tooth root load carrying capacity derive the material strength either from fatigue limit tables, that are based on test rig results, or from the calculation of local material data (e.g. based on hardness, residual stress, and oxidation) by means of empirical formulae. The research of the influence of material defects, such as pores or inclusions, in the context of weakest-link models, has shown that the material fatigue depends on the distribution of defect size within the material. Models for the consideration of the defect size on the tooth root strength, such as the model according to Murakami, have not been applied in fatigue models for gears yet and are focused on in this report. Therefore, the objective of this work is to introduce a method for the calculation of the tooth root load carrying capacity for gears, under consideration of the influence of the defect size on the endurance fatigue strength of the tooth root. The theoretical basis of this method is presented in this paper as well as the validation in running tests of helical and beveloid gears with different material batches, regarding the size distribution of inclusions. The torque level for a 50 percent failure probability of the gears is evaluated on the test rig and then compared to the results of the simulation. The simulative method allows for a performance of the staircase method that is usually performed physically in the back-to-back tests for endurance strength, as the statistical influence of the material properties is considered in the calculation model. The comparison between simulation and tests shows a high level of accordance. Copyright © 2016 American Gear Manufacturers Association.

Place, publisher, year, edition, pages
AGMA American Gear Manufacturers Association , 2016.
Keyword [en]
Bevel gears, Fatigue of materials, Gears, Helical gears, Load limits, Loads (forces), Strength of materials, Analytical formulas, Calculation models, Endurance fatigue strengths, Endurance strength, Failure Probability, Information concerning, Tooth contact analysis, Weakest-link models, Defects
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207571Scopus ID: 2-s2.0-85014092387ISBN: 9781555890605 (print)OAI: oai:DiVA.org:kth-207571DiVA, id: diva2:1102695
Conference
American Gear Manufacturers Association Fall Technical Meeting 2016, AGMA FTM 2016, 2 October 2016 through 4 October 2016
Note

Conference code: 125174; Export Date: 22 May 2017; Conference Paper. QC 20170530

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-05-30Bibliographically approved

Open Access in DiVA

No full text in DiVA

Scopus

Search in DiVA

By author/editor
Henser, J.
By organisation
School of Industrial Engineering and Management (ITM)
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 14 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf