Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 161-172 |
| Seitenumfang | 12 |
| Fachzeitschrift | Materials Science and Engineering A |
| Jahrgang | 657 |
| Publikationsstatus | Veröffentlicht - 7 März 2016 |
Abstract
Scatter of fracture toughness in the ductile-to-brittle transition (DTB) region for ferritic steels may show a dependence on the specimen geometry constraint. Consequently, this can be a source of uncertainty in transferring fracture data from one test geometry to other configurations. In this work, the modified Beremin model (MBM) for cleavage and the Bonora damage model (BDM) for ductile tearing, were combined to account for the two failure mechanisms competing in the DTB and to predict fracture toughness scatter band with temperature. The model was validated predicting the scatter in the fracture toughness data of A533B steel for SEB specimens with shallow and deep crack. Present model predictions were compared with master curve results. For the MBM, a more physical definition for the process zone was introduced and the temperature dependence of the reference stress σ u was described by the sum of athermal and thermally activated stress contributions. Results indicate that ductile crack growth occurring before fracture, which is predicted by the ductile damage model, has a relevant effect on the computed probability of brittle fracture. The proposed combined model is able to accurately account for the loss of constraint occurring in different specimen geometries confirming the geometry transferability of model parameters.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Ingenieurwesen (insg.)
- Werkstoffmechanik
- Ingenieurwesen (insg.)
- Maschinenbau
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: Materials Science and Engineering A, Jahrgang 657, 07.03.2016, S. 161-172.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Prediction of fracture toughness in ductile-to-brittle transition region using combined CDM and Beremin models
AU - Moattari, M.
AU - Sattari-Far, I.
AU - Persechino, I.
AU - Bonora, N.
N1 - Publisher Copyright: © 2016 Elsevier B.V.
PY - 2016/3/7
Y1 - 2016/3/7
N2 - Scatter of fracture toughness in the ductile-to-brittle transition (DTB) region for ferritic steels may show a dependence on the specimen geometry constraint. Consequently, this can be a source of uncertainty in transferring fracture data from one test geometry to other configurations. In this work, the modified Beremin model (MBM) for cleavage and the Bonora damage model (BDM) for ductile tearing, were combined to account for the two failure mechanisms competing in the DTB and to predict fracture toughness scatter band with temperature. The model was validated predicting the scatter in the fracture toughness data of A533B steel for SEB specimens with shallow and deep crack. Present model predictions were compared with master curve results. For the MBM, a more physical definition for the process zone was introduced and the temperature dependence of the reference stress σ u was described by the sum of athermal and thermally activated stress contributions. Results indicate that ductile crack growth occurring before fracture, which is predicted by the ductile damage model, has a relevant effect on the computed probability of brittle fracture. The proposed combined model is able to accurately account for the loss of constraint occurring in different specimen geometries confirming the geometry transferability of model parameters.
AB - Scatter of fracture toughness in the ductile-to-brittle transition (DTB) region for ferritic steels may show a dependence on the specimen geometry constraint. Consequently, this can be a source of uncertainty in transferring fracture data from one test geometry to other configurations. In this work, the modified Beremin model (MBM) for cleavage and the Bonora damage model (BDM) for ductile tearing, were combined to account for the two failure mechanisms competing in the DTB and to predict fracture toughness scatter band with temperature. The model was validated predicting the scatter in the fracture toughness data of A533B steel for SEB specimens with shallow and deep crack. Present model predictions were compared with master curve results. For the MBM, a more physical definition for the process zone was introduced and the temperature dependence of the reference stress σ u was described by the sum of athermal and thermally activated stress contributions. Results indicate that ductile crack growth occurring before fracture, which is predicted by the ductile damage model, has a relevant effect on the computed probability of brittle fracture. The proposed combined model is able to accurately account for the loss of constraint occurring in different specimen geometries confirming the geometry transferability of model parameters.
KW - Bonora damage model
KW - Cleavage fracture
KW - Cleavage-damage coupled model
KW - Ductile crack growth
KW - Ductile-to-brittle transition
KW - Modified Beremin model
UR - http://www.scopus.com/inward/record.url?scp=84955592609&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2015.12.090
DO - 10.1016/j.msea.2015.12.090
M3 - Article
VL - 657
SP - 161
EP - 172
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
ER -