A New LEFM based description of concrete fracture and size effects

Kim Wallin

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

1 Citation (Scopus)

Abstract

Concrete is a so called quasi-brittle material which, despite predominantly elastic material response, exhibits in tension loading a stable non-linear fracture response, when tested under displacement control. The reason for the non-linearity is the development of a fracture process zone, in front of the crack, due to micro-cracking and crack bridging. It has become increasingly popular to model the fracture process zone with different cohesive zone models. However, their use requires sophisticated finite element modeling and their success is directly related to the correctness of the assumed stress relaxation in the fracture process zone. An alternative is to use LEFM combined with an effective crack length. The effect of the fracture process zone is to make the specimen sense the crack as being longer than a0+?a. The fracture process zone causes thus an effective increase in the crack driving force but also the apparent fracture resistance increases since the fracture process zone effectively "blunts" the crack tip. This simple method, that does not require any finite element modeling, can be used as an aid to select the proper cohesive zone model for more sophisticated modeling
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication13th International Conference on Fracture ICF 2013
Place of Publication13th International Conference on Fracture. Beijing, China, 16 - 21 June, 2013.
PublisherCurran Associates Inc.
Pages647-656
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

Concretes
Cracks
Displacement control
Stress relaxation
Brittleness
Crack tips
Fracture toughness

Keywords

  • concrete fracture
  • size effect
  • fracture toughness
  • quasi-brittle materials
  • K-R

Cite this

Wallin, K. (2013). A New LEFM based description of concrete fracture and size effects. In Proceedings : 13th International Conference on Fracture ICF 2013 (pp. 647-656). 13th International Conference on Fracture. Beijing, China, 16 - 21 June, 2013.: Curran Associates Inc..
Wallin, Kim. / A New LEFM based description of concrete fracture and size effects. Proceedings : 13th International Conference on Fracture ICF 2013. 13th International Conference on Fracture. Beijing, China, 16 - 21 June, 2013. : Curran Associates Inc., 2013. pp. 647-656
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Wallin, K 2013, A New LEFM based description of concrete fracture and size effects. in Proceedings : 13th International Conference on Fracture ICF 2013. Curran Associates Inc., 13th International Conference on Fracture. Beijing, China, 16 - 21 June, 2013., pp. 647-656, 13th International Conference on Fracture 2013, ICF-13, Beijing, China, 16/06/13.

A New LEFM based description of concrete fracture and size effects. / Wallin, Kim.

Proceedings : 13th International Conference on Fracture ICF 2013. 13th International Conference on Fracture. Beijing, China, 16 - 21 June, 2013. : Curran Associates Inc., 2013. p. 647-656.

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

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AB - Concrete is a so called quasi-brittle material which, despite predominantly elastic material response, exhibits in tension loading a stable non-linear fracture response, when tested under displacement control. The reason for the non-linearity is the development of a fracture process zone, in front of the crack, due to micro-cracking and crack bridging. It has become increasingly popular to model the fracture process zone with different cohesive zone models. However, their use requires sophisticated finite element modeling and their success is directly related to the correctness of the assumed stress relaxation in the fracture process zone. An alternative is to use LEFM combined with an effective crack length. The effect of the fracture process zone is to make the specimen sense the crack as being longer than a0+?a. The fracture process zone causes thus an effective increase in the crack driving force but also the apparent fracture resistance increases since the fracture process zone effectively "blunts" the crack tip. This simple method, that does not require any finite element modeling, can be used as an aid to select the proper cohesive zone model for more sophisticated modeling

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Wallin K. A New LEFM based description of concrete fracture and size effects. In Proceedings : 13th International Conference on Fracture ICF 2013. 13th International Conference on Fracture. Beijing, China, 16 - 21 June, 2013.: Curran Associates Inc. 2013. p. 647-656