Critical assessment of the standard ASTM E 399

Kim Wallin

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

The plane-strain fracture toughness, KIC, defined by ASTM E 399, is assumed to represent a size insensitive lower bound value. The interpretation is due to the original work by George Irwin. In this work the consistency of the ASTM KIC plane-strain fracture toughness standard (ASTM E 399) is examined by reassessing the original data used to develop the standard, based on present knowledge about fracture micromechanisms. Originally, the standard was based on continuum mechanics assumptions, which have later been found inadequate to describe the real physical fracture process. The materials used for the development of ASTM E 399 were generally aluminum and titanium alloys or extra high strength steels. The materials had in common that their fracture micro-mechanism was ductile fracture, i.e., the materials showed a rising tearing resistance curve. Therefore, the fracture toughness did not show the expected decreasing trend with increasing specimen size, but generally the opposite trend. The specimen thickness was assumed to be the limiting dimension, even though much of the experimental data indicated that the specimen ligament size, not the thickness, controlled the fracture toughness value.
Original languageEnglish
Pages (from-to)17 - 37
Number of pages21
JournalJournal of ASTM International
Volume2
Issue number4
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

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Fracture toughness
Physical Phenomena
Stress Fractures
Steel
Mechanics
Ligaments
Continuum mechanics
Ductile fracture
High strength steel
Titanium alloys
Aluminum alloys
titanium aluminum alloy

Cite this

Wallin, Kim. / Critical assessment of the standard ASTM E 399. In: Journal of ASTM International. 2005 ; Vol. 2, No. 4. pp. 17 - 37.
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Critical assessment of the standard ASTM E 399. / Wallin, Kim.

In: Journal of ASTM International, Vol. 2, No. 4, 2005, p. 17 - 37.

Research output: Contribution to journalArticleScientificpeer-review

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