Bucket wheel failure caused by residual stresses in welded joints
Само за регистроване кориснике
2011
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Cracks in the welded joints on the bucket wheel (BW) body of the bucket wheel excavator (BWE) SRs 1300 were discovered after merely 1800 h of operation. Investigations are carried out in order to detect the causes of cracks occurrence and thus prevent possible heavy damages to the machine. Working stresses in the BW body are defined by using FEM. Methods of strain gauges are used for the experimental stress analysis in real working conditions. Measurements of welding residual stresses are carried out by applying the centre hole drilling method. Additionally, experimental investigations defined the chemical composition, tensile properties, hardness, impact toughness, as well as the susceptibility to cracking (measurement of residual hydrogen, FISCO, Tekken and CTS methods). External loads induced by the resistance-to-excavation are determined by following a model that encompasses all relevant structural parameters and also the BWE duty cycle parameters. By using FEM, it was identified t...hat the maximum values of equivalent stress in the zones of cracks occurrence are lower than the allowable values. This conclusion is confirmed by measurements. The measured values of welding residual stresses reach the value of yield strength in critical zones. Non-compliances during grooving (clearance in the root is substantially larger than the prescribed one) caused large filler material deposition and heat input. Such welded joints are susceptible to cold cracking. Based on the results of the numerical-experimental analysis, findings show that in critical zones the combination of working (dynamic) and residual (static) stress can be above the limit lines of modified Goodman's diagrams i.e. that the fatigue safety of the BW body structure was insufficient.
Кључне речи:
Stress analysis / Residual stress / Fatigue safety evaluation / Cracks / Bucket wheelИзвор:
Engineering Failure Analysis, 2011, 18, 2, 700-712Издавач:
- Pergamon-Elsevier Science Ltd, Oxford
Финансирање / пројекти:
DOI: 10.1016/j.engfailanal.2010.11.009
ISSN: 1350-6307
WoS: 000288881300019
Scopus: 2-s2.0-79951727255
Институција/група
Inovacioni centarTY - JOUR AU - Arsić, Miodrag AU - Bošnjak, Srđan AU - Zrnić, Nenad AU - Sedmak, Aleksandar AU - Gnjatović, Nebojša PY - 2011 UR - https://machinery.mas.bg.ac.rs/handle/123456789/1146 AB - Cracks in the welded joints on the bucket wheel (BW) body of the bucket wheel excavator (BWE) SRs 1300 were discovered after merely 1800 h of operation. Investigations are carried out in order to detect the causes of cracks occurrence and thus prevent possible heavy damages to the machine. Working stresses in the BW body are defined by using FEM. Methods of strain gauges are used for the experimental stress analysis in real working conditions. Measurements of welding residual stresses are carried out by applying the centre hole drilling method. Additionally, experimental investigations defined the chemical composition, tensile properties, hardness, impact toughness, as well as the susceptibility to cracking (measurement of residual hydrogen, FISCO, Tekken and CTS methods). External loads induced by the resistance-to-excavation are determined by following a model that encompasses all relevant structural parameters and also the BWE duty cycle parameters. By using FEM, it was identified that the maximum values of equivalent stress in the zones of cracks occurrence are lower than the allowable values. This conclusion is confirmed by measurements. The measured values of welding residual stresses reach the value of yield strength in critical zones. Non-compliances during grooving (clearance in the root is substantially larger than the prescribed one) caused large filler material deposition and heat input. Such welded joints are susceptible to cold cracking. Based on the results of the numerical-experimental analysis, findings show that in critical zones the combination of working (dynamic) and residual (static) stress can be above the limit lines of modified Goodman's diagrams i.e. that the fatigue safety of the BW body structure was insufficient. PB - Pergamon-Elsevier Science Ltd, Oxford T2 - Engineering Failure Analysis T1 - Bucket wheel failure caused by residual stresses in welded joints EP - 712 IS - 2 SP - 700 VL - 18 DO - 10.1016/j.engfailanal.2010.11.009 ER -
@article{ author = "Arsić, Miodrag and Bošnjak, Srđan and Zrnić, Nenad and Sedmak, Aleksandar and Gnjatović, Nebojša", year = "2011", abstract = "Cracks in the welded joints on the bucket wheel (BW) body of the bucket wheel excavator (BWE) SRs 1300 were discovered after merely 1800 h of operation. Investigations are carried out in order to detect the causes of cracks occurrence and thus prevent possible heavy damages to the machine. Working stresses in the BW body are defined by using FEM. Methods of strain gauges are used for the experimental stress analysis in real working conditions. Measurements of welding residual stresses are carried out by applying the centre hole drilling method. Additionally, experimental investigations defined the chemical composition, tensile properties, hardness, impact toughness, as well as the susceptibility to cracking (measurement of residual hydrogen, FISCO, Tekken and CTS methods). External loads induced by the resistance-to-excavation are determined by following a model that encompasses all relevant structural parameters and also the BWE duty cycle parameters. By using FEM, it was identified that the maximum values of equivalent stress in the zones of cracks occurrence are lower than the allowable values. This conclusion is confirmed by measurements. The measured values of welding residual stresses reach the value of yield strength in critical zones. Non-compliances during grooving (clearance in the root is substantially larger than the prescribed one) caused large filler material deposition and heat input. Such welded joints are susceptible to cold cracking. Based on the results of the numerical-experimental analysis, findings show that in critical zones the combination of working (dynamic) and residual (static) stress can be above the limit lines of modified Goodman's diagrams i.e. that the fatigue safety of the BW body structure was insufficient.", publisher = "Pergamon-Elsevier Science Ltd, Oxford", journal = "Engineering Failure Analysis", title = "Bucket wheel failure caused by residual stresses in welded joints", pages = "712-700", number = "2", volume = "18", doi = "10.1016/j.engfailanal.2010.11.009" }
Arsić, M., Bošnjak, S., Zrnić, N., Sedmak, A.,& Gnjatović, N.. (2011). Bucket wheel failure caused by residual stresses in welded joints. in Engineering Failure Analysis Pergamon-Elsevier Science Ltd, Oxford., 18(2), 700-712. https://doi.org/10.1016/j.engfailanal.2010.11.009
Arsić M, Bošnjak S, Zrnić N, Sedmak A, Gnjatović N. Bucket wheel failure caused by residual stresses in welded joints. in Engineering Failure Analysis. 2011;18(2):700-712. doi:10.1016/j.engfailanal.2010.11.009 .
Arsić, Miodrag, Bošnjak, Srđan, Zrnić, Nenad, Sedmak, Aleksandar, Gnjatović, Nebojša, "Bucket wheel failure caused by residual stresses in welded joints" in Engineering Failure Analysis, 18, no. 2 (2011):700-712, https://doi.org/10.1016/j.engfailanal.2010.11.009 . .