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Snap-back softening instability in high-strength concrete beams

Biolzi, L. / Cangiano, S. / Tognon, G. / Carpinteri, A.

Abstract Three-point bending tests on pre-cracked slabs of high-strength concrete are interpreted on the basis of a virtual crack propagation model. As theoretically shown by the model, a snap-back softening instability appears only for initial crack lengths smaller than 0.3 times the beam depth. As a limit-case, when the material is sufficiently brittle or the specimen size is sufficiently large, such an instability can be predicted by the LEFM condition $ K_{1} $=$ K_{IC} $.

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Snap-back softening instability in high-strength concrete beams

Biolzi, L. / Cangiano, S. / Tognon, G. / Carpinteri, A.

Abstract Three-point bending tests on pre-cracked slabs of high-strength concrete are interpreted on the basis of a virtual crack propagation model. As theoretically shown by the model, a snap-back softening instability appears only for initial crack lengths smaller than 0.3 times the beam depth. As a limit-case, when the material is sufficiently brittle or the specimen size is sufficiently large, such an instability can be predicted by the LEFM condition $ K_{1} $=$ K_{IC} $.

Snap-back softening instability in high-strength concrete beams

Biolzi, L. / Cangiano, S. / Tognon, G. / Carpinteri, A.

Abstract Three-point bending tests on pre-cracked slabs of high-strength concrete are interpreted on the basis of a virtual crack propagation model. As theoretically shown by the model, a snap-back softening instability appears only for initial crack lengths smaller than 0.3 times the beam depth. As a limit-case, when the material is sufficiently brittle or the specimen size is sufficiently large, such an instability can be predicted by the LEFM condition $ K_{1} $=$ K_{IC} $.

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Title:

Snap-back softening instability in high-strength concrete beams

Contributors:

Biolzi, L. (author) / Cangiano, S. (author) / Tognon, G. (author) / Carpinteri, A. (author)

Published in:

Materials and Structures ; 22

Publication date:

1989

ISSN:

DOI:

https://doi.org/10.1007/BF02472220

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Crack Mouth Opening Displacement , Fracture Toughness , Linear Elastic Fracture Mecha , Initial Crack Length , Crack Depth

Classification:

BKL: 56.45 Baustoffkunde / 51.30 Werkstoffprüfung, Werkstoffuntersuchung
Local classification TIB: 275/6500 / 250/6500

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