Determination of ductile crack initiation by magnetic emission and potential drop techniques using pre-cracked Charpy specimens
Само за регистроване кориснике
2002
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Magnetic emission (ME) and potential drop (PD) techniques were used for instrumented Charpy impact testing in order to determine critical crack initiation properties of standard pre-cracked three-point bending specimens at room temperature. Results for high strength low-alloyed steel specimens, with ductile properties, were compared for determination of critical fracture mechanics parameters upon the onset of ductile crack growth. In the case of ductile, or mixed ductile/cleavage fracture at temperatures well above nil-ductile, or at lower impact energies, it is sometimes difficult to distinguish crack initiation from ME signal, while the integrated magnetic emission signal (MF) sometimes has a slower changing rate. Results were also obtained by applying the potential drop technique with single specimen HSLA steels and by evaluating the R-curve. Initiation of stable crack growth may also be depicted from local minimum (or maximum) of potential drop value and it may not give clear local... extreme values when conditions of fracture change from brittle to ductile. Alternatively, if the change of slope in the PD-t diagram can be used to evaluate critical crack behaviour, compared to similar changes of slope in the MF-t diagram, it may provide a better understanding of both.
Кључне речи:
potential drop / magnetic emission / impact testing / fracture mechanics / dynamic resistance curve / ductile crack growthИзвор:
European Structural Integrity Society, 2002, 30, C, 71-78Финансирање / пројекти:
- The authors gratefully acknowledge the support of the OTKA T 030057 project.
Институција/група
Inovacioni centarTY - JOUR AU - Radaković, Zoran AU - Sedmak, Aleksandar AU - Lenkey, Gyoengyver B. AU - Grabulov, Vencislav PY - 2002 UR - https://machinery.mas.bg.ac.rs/handle/123456789/274 AB - Magnetic emission (ME) and potential drop (PD) techniques were used for instrumented Charpy impact testing in order to determine critical crack initiation properties of standard pre-cracked three-point bending specimens at room temperature. Results for high strength low-alloyed steel specimens, with ductile properties, were compared for determination of critical fracture mechanics parameters upon the onset of ductile crack growth. In the case of ductile, or mixed ductile/cleavage fracture at temperatures well above nil-ductile, or at lower impact energies, it is sometimes difficult to distinguish crack initiation from ME signal, while the integrated magnetic emission signal (MF) sometimes has a slower changing rate. Results were also obtained by applying the potential drop technique with single specimen HSLA steels and by evaluating the R-curve. Initiation of stable crack growth may also be depicted from local minimum (or maximum) of potential drop value and it may not give clear local extreme values when conditions of fracture change from brittle to ductile. Alternatively, if the change of slope in the PD-t diagram can be used to evaluate critical crack behaviour, compared to similar changes of slope in the MF-t diagram, it may provide a better understanding of both. T2 - European Structural Integrity Society T1 - Determination of ductile crack initiation by magnetic emission and potential drop techniques using pre-cracked Charpy specimens EP - 78 IS - C SP - 71 VL - 30 DO - 10.1016/S1566-1369(02)80007-3 ER -
@article{ author = "Radaković, Zoran and Sedmak, Aleksandar and Lenkey, Gyoengyver B. and Grabulov, Vencislav", year = "2002", abstract = "Magnetic emission (ME) and potential drop (PD) techniques were used for instrumented Charpy impact testing in order to determine critical crack initiation properties of standard pre-cracked three-point bending specimens at room temperature. Results for high strength low-alloyed steel specimens, with ductile properties, were compared for determination of critical fracture mechanics parameters upon the onset of ductile crack growth. In the case of ductile, or mixed ductile/cleavage fracture at temperatures well above nil-ductile, or at lower impact energies, it is sometimes difficult to distinguish crack initiation from ME signal, while the integrated magnetic emission signal (MF) sometimes has a slower changing rate. Results were also obtained by applying the potential drop technique with single specimen HSLA steels and by evaluating the R-curve. Initiation of stable crack growth may also be depicted from local minimum (or maximum) of potential drop value and it may not give clear local extreme values when conditions of fracture change from brittle to ductile. Alternatively, if the change of slope in the PD-t diagram can be used to evaluate critical crack behaviour, compared to similar changes of slope in the MF-t diagram, it may provide a better understanding of both.", journal = "European Structural Integrity Society", title = "Determination of ductile crack initiation by magnetic emission and potential drop techniques using pre-cracked Charpy specimens", pages = "78-71", number = "C", volume = "30", doi = "10.1016/S1566-1369(02)80007-3" }
Radaković, Z., Sedmak, A., Lenkey, G. B.,& Grabulov, V.. (2002). Determination of ductile crack initiation by magnetic emission and potential drop techniques using pre-cracked Charpy specimens. in European Structural Integrity Society, 30(C), 71-78. https://doi.org/10.1016/S1566-1369(02)80007-3
Radaković Z, Sedmak A, Lenkey GB, Grabulov V. Determination of ductile crack initiation by magnetic emission and potential drop techniques using pre-cracked Charpy specimens. in European Structural Integrity Society. 2002;30(C):71-78. doi:10.1016/S1566-1369(02)80007-3 .
Radaković, Zoran, Sedmak, Aleksandar, Lenkey, Gyoengyver B., Grabulov, Vencislav, "Determination of ductile crack initiation by magnetic emission and potential drop techniques using pre-cracked Charpy specimens" in European Structural Integrity Society, 30, no. C (2002):71-78, https://doi.org/10.1016/S1566-1369(02)80007-3 . .