An experimental verification of numerical models for the fracture and fatigue of welded structures
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By allowing a more detailed analysis, numerical modelling has an important role to play in the development of structures. However, the results of a numerical model's analysis have to be verified with an experimental analysis for the application. Two full-scale welded-structure tests were used for the verification of the proposed numerical models. In the first case a pressure vessel pre-cracked in weld metal and instrumented for a J-integral measurement was tested. In this way the crack's driving force, expressed as the J integral, could be determined directly. The crack's driving force was calculated by applying the Ratwani-Erdogan-Irwin (REI) numerical model. The experimental results were compared to the values obtained with the REI model. In was shown that the application of the model produces conservative results and that the model can be applied for a structural integrity assessment of cracked pressure vessels. The second case was the welded structure of a rotor excavator. The crit...ical welded components were modelled in full scale. The loading was recorded with strain gauges at critical locations, analyzed and elaborated in the form of the stress spectrum applied in the testing. The experimental results were compared to those obtained with numerical models. The comparison revealed that the model significantly overestimates the real cycle number for the fatigue limit. These two examples clearly demonstrated the complexity of the problem. In the case of the pressure vessel the model results are conservative, while those obtained for the fatigue are too optimistic.
Кључне речи:
welded joint / numerical model / fracture / fatigue / experimentИзвор:
Materiali in Tehnologije, 2007, 41, 4, 173-178Издавач:
- Institute of Metals and Technology
Институција/група
Inovacioni centarTY - JOUR AU - Sedmak, Stojan AU - Sedmak, Aleksandar AU - Arsić, Miodrag AU - Vojvodić-Tuma, Jelena PY - 2007 UR - https://machinery.mas.bg.ac.rs/handle/123456789/666 AB - By allowing a more detailed analysis, numerical modelling has an important role to play in the development of structures. However, the results of a numerical model's analysis have to be verified with an experimental analysis for the application. Two full-scale welded-structure tests were used for the verification of the proposed numerical models. In the first case a pressure vessel pre-cracked in weld metal and instrumented for a J-integral measurement was tested. In this way the crack's driving force, expressed as the J integral, could be determined directly. The crack's driving force was calculated by applying the Ratwani-Erdogan-Irwin (REI) numerical model. The experimental results were compared to the values obtained with the REI model. In was shown that the application of the model produces conservative results and that the model can be applied for a structural integrity assessment of cracked pressure vessels. The second case was the welded structure of a rotor excavator. The critical welded components were modelled in full scale. The loading was recorded with strain gauges at critical locations, analyzed and elaborated in the form of the stress spectrum applied in the testing. The experimental results were compared to those obtained with numerical models. The comparison revealed that the model significantly overestimates the real cycle number for the fatigue limit. These two examples clearly demonstrated the complexity of the problem. In the case of the pressure vessel the model results are conservative, while those obtained for the fatigue are too optimistic. PB - Institute of Metals and Technology T2 - Materiali in Tehnologije T1 - An experimental verification of numerical models for the fracture and fatigue of welded structures EP - 178 IS - 4 SP - 173 VL - 41 UR - https://hdl.handle.net/21.15107/rcub_machinery_666 ER -
@article{ author = "Sedmak, Stojan and Sedmak, Aleksandar and Arsić, Miodrag and Vojvodić-Tuma, Jelena", year = "2007", abstract = "By allowing a more detailed analysis, numerical modelling has an important role to play in the development of structures. However, the results of a numerical model's analysis have to be verified with an experimental analysis for the application. Two full-scale welded-structure tests were used for the verification of the proposed numerical models. In the first case a pressure vessel pre-cracked in weld metal and instrumented for a J-integral measurement was tested. In this way the crack's driving force, expressed as the J integral, could be determined directly. The crack's driving force was calculated by applying the Ratwani-Erdogan-Irwin (REI) numerical model. The experimental results were compared to the values obtained with the REI model. In was shown that the application of the model produces conservative results and that the model can be applied for a structural integrity assessment of cracked pressure vessels. The second case was the welded structure of a rotor excavator. The critical welded components were modelled in full scale. The loading was recorded with strain gauges at critical locations, analyzed and elaborated in the form of the stress spectrum applied in the testing. The experimental results were compared to those obtained with numerical models. The comparison revealed that the model significantly overestimates the real cycle number for the fatigue limit. These two examples clearly demonstrated the complexity of the problem. In the case of the pressure vessel the model results are conservative, while those obtained for the fatigue are too optimistic.", publisher = "Institute of Metals and Technology", journal = "Materiali in Tehnologije", title = "An experimental verification of numerical models for the fracture and fatigue of welded structures", pages = "178-173", number = "4", volume = "41", url = "https://hdl.handle.net/21.15107/rcub_machinery_666" }
Sedmak, S., Sedmak, A., Arsić, M.,& Vojvodić-Tuma, J.. (2007). An experimental verification of numerical models for the fracture and fatigue of welded structures. in Materiali in Tehnologije Institute of Metals and Technology., 41(4), 173-178. https://hdl.handle.net/21.15107/rcub_machinery_666
Sedmak S, Sedmak A, Arsić M, Vojvodić-Tuma J. An experimental verification of numerical models for the fracture and fatigue of welded structures. in Materiali in Tehnologije. 2007;41(4):173-178. https://hdl.handle.net/21.15107/rcub_machinery_666 .
Sedmak, Stojan, Sedmak, Aleksandar, Arsić, Miodrag, Vojvodić-Tuma, Jelena, "An experimental verification of numerical models for the fracture and fatigue of welded structures" in Materiali in Tehnologije, 41, no. 4 (2007):173-178, https://hdl.handle.net/21.15107/rcub_machinery_666 .