The Elusive temperature dependence on the Master Curve

Kim Wallin

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

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 languageEnglish
Title of host publicationProceedings
Subtitle of host publication13th International Conference on Fracture ICF 2013
Place of PublicationRed Hook, NY, USA
PublisherCurran Associates Inc.
Number of pages9
ISBN (Print)978-1-62993-369-6
Publication statusPublished - 2013
MoE publication typeNot Eligible
Event13th International Conference on Fracture 2013, ICF-13 - Beijing, China
Duration: 16 Jun 201321 Jun 2013

Conference

Conference13th International Conference on Fracture 2013, ICF-13
Abbreviated titleICF 2013
CountryChina
CityBeijing
Period16/06/1321/06/13

Fingerprint

fracture strength
temperature dependence
curves
cleavage
stress distribution
crack propagation
cracks
steels
methodology
slopes
products
temperature

Keywords

  • Master Curve
  • cleavage fracture
  • temperature dependence

Cite this

Wallin, K. (2013). The Elusive temperature dependence on the Master Curve. In Proceedings: 13th International Conference on Fracture ICF 2013 Red Hook, NY, USA: Curran Associates Inc..
Wallin, Kim. / The Elusive temperature dependence on the Master Curve. Proceedings: 13th International Conference on Fracture ICF 2013. Red Hook, NY, USA : Curran Associates Inc., 2013.
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Wallin, K 2013, The Elusive temperature dependence on the Master Curve. in Proceedings: 13th International Conference on Fracture ICF 2013. Curran Associates Inc., Red Hook, NY, USA, 13th International Conference on Fracture 2013, ICF-13, Beijing, China, 16/06/13.

The Elusive temperature dependence on the Master Curve. / Wallin, Kim.

Proceedings: 13th International Conference on Fracture ICF 2013. Red Hook, NY, USA : Curran Associates Inc., 2013.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AB - 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

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Wallin K. The Elusive temperature dependence on the Master Curve. In Proceedings: 13th International Conference on Fracture ICF 2013. Red Hook, NY, USA: Curran Associates Inc. 2013