umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
DEVELOPMENT OF FATIGUE TESTING METHOD OF FORWARDER BUNK
Umeå University, Faculty of Science and Technology, Department of Physics.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The fatigue phenomena is one of the most common causes of failures in structural mechanics and is due to repeatedly applied loads. Komatsu Forest AB, one of the largest manufacturers of forest machines on planet Earth was in need of a fatigue life test of a forwarder bunk which exposes the bunk in a realistic way. Such a test extends the knowledge of the strength, but also, makes it easier to improve the evolution of the design. To develop this, knowledge about the movements, i.e. the accelerations of the forwarder and its load out in the field were of greatest importance. Therefore, measurements of angles, accelerations and strains were carried out, followed by analysis of correlations in order to know the cause of fatigue. The results showed that lateral acceleration as well as the tilting of the forwarder are responsible of the repetitive strains occurred during runtime. To simulate this in a test, a method which uses two actuators to apply forces supposed to lead to comparable strains of the bunk is developed. The method of equivalent fatigue load is used in order to simplify the more complex real life situation. Despite the complicated movement and forces on the bunks in the field, it seems possible to get an accurate fatigue test with only two actuators. The fatigue testing method showed both good and bad results of the strains at different positions. Some more refinements of the applied force components as well as the positions might be needed before such a test is executed.

Place, publisher, year, edition, pages
2019.
Keywords [en]
fatigue, test, design, forwarder, mechanics, structural, machinery, strength, stress, strain
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-156793OAI: oai:DiVA.org:umu-156793DiVA, id: diva2:1292089
External cooperation
Komatsu Forest AB
Subject / course
Examensarbete i teknisk fysik
Educational program
Master of Science Programme in Engineering Physics
Available from: 2019-02-28 Created: 2019-02-27 Last updated: 2019-02-28Bibliographically approved

Open Access in DiVA

fulltext(22228 kB)71 downloads
File information
File name FULLTEXT01.pdfFile size 22228 kBChecksum SHA-512
00cbf257a33411b3a88a44fec562949daf172f18f2cd82272ef5c92ef6fa221eace7629eddaf46bfab4b78187e923ae0e3d2f1e2a3550660537b3bde4f275da2
Type fulltextMimetype application/pdf

By organisation
Department of Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 71 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 260 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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