Abstract
The Master Curve methodology for describing cleavage
fracture toughness, scatter, size-effects and temperature
dependence has been standardized in ASTM E1921. The
scatter and size-effects predicted by the method are
based on theory, whereas the temperature dependence is
the result of empirical observations. The reason for the
seemingly nearly invariant temperature dependence of the
cleavage fracture toughness of different steels has until
now eluded theoretical explanations. The standard
fracture toughness temperature dependence is expressed in
terms of the normalization fracture toughness K0.
However, K0 is really the product of three separate
parameters, Kmin, K0i and P(K8), all of which are
temperature dependent. Kmin is related to the steepness
of the stress distribution in front of the crack, K0i is
connected to the likelihood of initiation and P(K8)
describes the likelihood of cleavage crack propagation in
a unified stress field. This presentation gives some more
insight into the factors that lead to the experimentally
observed temperature dependence. Finally, a new more
material specific temperature dependence usable instead
of the standard expression is given
Original language | English |
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Title of host publication | Proceedings |
Subtitle of host publication | 13th International Conference on Fracture ICF 2013 |
Place of Publication | Red Hook, NY, USA |
Publisher | Curran Associates Inc. |
Number of pages | 9 |
ISBN (Print) | 978-1-62993-369-6 |
Publication status | Published - 2013 |
MoE publication type | Not Eligible |
Event | 13th International Conference on Fracture 2013, ICF-13 - Beijing, China Duration: 16 Jun 2013 → 21 Jun 2013 |
Conference
Conference | 13th International Conference on Fracture 2013, ICF-13 |
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Abbreviated title | ICF 2013 |
Country/Territory | China |
City | Beijing |
Period | 16/06/13 → 21/06/13 |
Keywords
- Master Curve
- cleavage fracture
- temperature dependence