We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
FAILURE ANALYSIS OF BOLTED JOINT FOR THE COLUMN OF AN AERIAL PLATFORM.
- Authors
Rakićević, Branislav; Maneski, Miloš; Mitić, Saša; Vorotović, Goran; Kozak, Dražan; Katinić, Marko
- Abstract
This paper focuses on the identification of failure causes of a bolted joint used for the bedding of a primary column of an aerial platform. The tests conducted to determine chemical composition and mechanical properties have confirmed the 12.9 grade of the bolts. Also, mechanical properties tests and metallographic examination did not indicate any hidden defects caused by heat treatment (e.g. decarburisation etc.). On the other hand, visual and metallographic examination of cross-section as well as electron microscope scanning confirmed fatigue fracture of the bolts. Therefore, further analyses were done to check the dimensioning and the installation of the bolts. The effects on stress states in the bolts are presented from the standpoint of rated operating regimes, stiffness of joined elements, lubrication conditions of thread surfaces and temperature incompatibility between the bolts and elements being joined. Pre-tightening torque value incompatible with lubrication conditions was found to be the main factor that led to high stress values that initiated and later intensified the fatigue process which ended in fatigue failure of the bolts.
- Subjects
BOLTED joint testing; FAILURE analysis; ELEVATING platforms; METALLOGRAPHY; LUBRICATION &; lubricants; STIFFNESS (Engineering)
- Publication
Technical Gazette / Tehnički Vjesnik, 2016, Vol 23, Issue 5, p1301
- ISSN
1330-3651
- Publication type
Article
- DOI
10.17559/TV-20150513090840