The size effect in KICresults

Kim Wallin

Research output: Contribution to journalArticleScientificpeer-review

217 Citations (Scopus)

Abstract

Fracture toughness results are often connected with varying thickness effects. Many results are contradictory, with some results indicating no size effect, some indicating increasing toughness with decreasing thickness and others indicating decreasing toughness with decreasing thickness. In this paper the causes for different thickness effects are discussed. It is shown that most of the observed size effects are due to invalid tests. The only test parameters to be regarded as valid are those that correspond to the initiation of crack extension. The theoretical thickness effects for both ductile and brittle fracture initiation are evaluated. It is shown that ductile fracture initiation is thickness independent if Bα(J/σy). The thickness effect in brittle fracture is explained by applying a mechanism-based statistical cleavage fracture model. A theoretical thickness correction for cleavage fracture is derived, and its validity is confirmed for a variety of materials.

Original languageEnglish
Pages (from-to)149 - 163
Number of pages15
JournalEngineering Fracture Mechanics
Volume22
Issue number1
DOIs
Publication statusPublished - 1985
MoE publication typeNot Eligible

Fingerprint

Ductile fracture
Brittle fracture
Toughness
Fracture toughness
Cracks

Cite this

Wallin, Kim. / The size effect in KICresults. In: Engineering Fracture Mechanics. 1985 ; Vol. 22, No. 1. pp. 149 - 163.
@article{4c2d55d4771c4ea3b6bb6469abe639e8,
title = "The size effect in KICresults",
abstract = "Fracture toughness results are often connected with varying thickness effects. Many results are contradictory, with some results indicating no size effect, some indicating increasing toughness with decreasing thickness and others indicating decreasing toughness with decreasing thickness. In this paper the causes for different thickness effects are discussed. It is shown that most of the observed size effects are due to invalid tests. The only test parameters to be regarded as valid are those that correspond to the initiation of crack extension. The theoretical thickness effects for both ductile and brittle fracture initiation are evaluated. It is shown that ductile fracture initiation is thickness independent if B ≥α(J/σy). The thickness effect in brittle fracture is explained by applying a mechanism-based statistical cleavage fracture model. A theoretical thickness correction for cleavage fracture is derived, and its validity is confirmed for a variety of materials.",
author = "Kim Wallin",
year = "1985",
doi = "10.1016/0013-7944(85)90167-5",
language = "English",
volume = "22",
pages = "149 -- 163",
journal = "Engineering Fracture Mechanics",
issn = "0013-7944",
publisher = "Elsevier",
number = "1",

}

The size effect in KICresults. / Wallin, Kim.

In: Engineering Fracture Mechanics, Vol. 22, No. 1, 1985, p. 149 - 163.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The size effect in KICresults

AU - Wallin, Kim

PY - 1985

Y1 - 1985

N2 - Fracture toughness results are often connected with varying thickness effects. Many results are contradictory, with some results indicating no size effect, some indicating increasing toughness with decreasing thickness and others indicating decreasing toughness with decreasing thickness. In this paper the causes for different thickness effects are discussed. It is shown that most of the observed size effects are due to invalid tests. The only test parameters to be regarded as valid are those that correspond to the initiation of crack extension. The theoretical thickness effects for both ductile and brittle fracture initiation are evaluated. It is shown that ductile fracture initiation is thickness independent if B ≥α(J/σy). The thickness effect in brittle fracture is explained by applying a mechanism-based statistical cleavage fracture model. A theoretical thickness correction for cleavage fracture is derived, and its validity is confirmed for a variety of materials.

AB - Fracture toughness results are often connected with varying thickness effects. Many results are contradictory, with some results indicating no size effect, some indicating increasing toughness with decreasing thickness and others indicating decreasing toughness with decreasing thickness. In this paper the causes for different thickness effects are discussed. It is shown that most of the observed size effects are due to invalid tests. The only test parameters to be regarded as valid are those that correspond to the initiation of crack extension. The theoretical thickness effects for both ductile and brittle fracture initiation are evaluated. It is shown that ductile fracture initiation is thickness independent if B ≥α(J/σy). The thickness effect in brittle fracture is explained by applying a mechanism-based statistical cleavage fracture model. A theoretical thickness correction for cleavage fracture is derived, and its validity is confirmed for a variety of materials.

U2 - 10.1016/0013-7944(85)90167-5

DO - 10.1016/0013-7944(85)90167-5

M3 - Article

VL - 22

SP - 149

EP - 163

JO - Engineering Fracture Mechanics

JF - Engineering Fracture Mechanics

SN - 0013-7944

IS - 1

ER -