RESEARCH PAPER
Fatigue lifetime correction of structural joints Indexed by: of opencast mining machinery
1
Warsaw University of Technology, Institute of Vehicles and Construction Machinery Engineering, ul. Narbutta 84, 02-524 Warsaw, Poland
Publication date: 2021-09-30
Eksploatacja i Niezawodność – Maintenance and Reliability 2021;23(3):530-539
HIGHLIGHTS
- The novel comprehensive approach to fatigue design of welded superstructures was presented.
- Functionality of the method has been developed and verified on the real object remaining in operation.
- Fatigue lifetime correction results for long-time operated object was provided.
- The procedure improves fatigue lifetime assessments credibility and helps to provide requested lifetime.
- The method aids maintenance of superstructure providing information about its technical condition.
KEYWORDS
ABSTRACT
Opencast mining machinery represents a group of large-scale individually manufactured technical objects operated with long-life requests. Since their manufacturers are obliged to provide product that will reach declared time of life, fatigue strength and durability conditions have to be taken into account for superstructures to meet the requirements. The paper highlights main problems occurring while assessing fatigue lifetime during design. Firstly, the short survey of current state of the art regarding the approach to this problem is presented. Secondly, the most important reasons of unsatisfactory accuracy of the assessments are discussed. As a main objective of the study, the authors introduce the unique method of continuous fatigue lifetime correction for the welded superstructures during the machine lifecycle, as a remedy for this group of machinery. Furthermore, results and experience from adapting the approach in real object are presented, including fatigue lifetime correction due to the real intensity of loading acquired from a bucket-wheel excavator during its longlasting operation. It is expected that proposed procedure can help to improve credibility of fatigue lifetime assessment of heavy earthmoving machinery.
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