Examination of the Essential Work of Fracture Method for Paper

Atsushi Tanaka, Tatsuo Yamauchi

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

Abstract

The "Essential Work of Fracture (EWF)" method to estimate fracture toughness was examined by means of infrared thermography and video-microscopy. Plastic deformation zone appears in three ways when deep double edge notched tension (DENT) specimens are strained under in-plane stress as follows: 1.type(i) - appearing whole through the ligament in a vague and scattering manner, and developing into a circular (or oval) zone even before or at the maximum load point; 2.type(ii) - appearing from the notch tips and amalgamating into a circular (or oval) zone after the maximum load point; 3.type(iii) - appearing from the notch tips and not amalgamating into a circular (or oval) zone until the sheet failure. Specimens with small ligament are likely to belong to type(i), while those with large ligament to type(ii)&(iii). The analysis using video-microscopy showed that crack propagation starts at the maximum load point for the specimens with small ligament length, while it starts earlier before the point with an increase of the ligament length. And it turned out that type(i) specimens belong to the former. According to the original prerequisite, the EWF method is valid if there is a complete yielding of the ligament before the crack propagation. Therefore only type(i) specimens are concluded to be valid for the EWF method.
Original languageEnglish
Title of host publicationTAPPI International Paper Physics Conference 1999 Proceedings
PublisherTAPPI Press
Pages171-177
Number of pages7
ISBN (Print)0 89852 954 9
Publication statusPublished - 1999
MoE publication typeA4 Article in a conference publication
EventInternational Paper Physics Conference - San Diego, United States
Duration: 26 Sep 199930 Sep 1999

Conference

ConferenceInternational Paper Physics Conference
Abbreviated titleIPPC
CountryUnited States
CitySan Diego
Period26/09/9930/09/99

Fingerprint

Ligaments
Crack propagation
Microscopic examination
Fracture toughness
Plastic deformation
Scattering

Cite this

Tanaka, A., & Yamauchi, T. (1999). Examination of the Essential Work of Fracture Method for Paper. In TAPPI International Paper Physics Conference 1999 Proceedings (pp. 171-177). TAPPI Press.
Tanaka, Atsushi ; Yamauchi, Tatsuo. / Examination of the Essential Work of Fracture Method for Paper. TAPPI International Paper Physics Conference 1999 Proceedings. TAPPI Press, 1999. pp. 171-177
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Tanaka, A & Yamauchi, T 1999, Examination of the Essential Work of Fracture Method for Paper. in TAPPI International Paper Physics Conference 1999 Proceedings. TAPPI Press, pp. 171-177, International Paper Physics Conference, San Diego, United States, 26/09/99.

Examination of the Essential Work of Fracture Method for Paper. / Tanaka, Atsushi; Yamauchi, Tatsuo.

TAPPI International Paper Physics Conference 1999 Proceedings. TAPPI Press, 1999. p. 171-177.

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

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T1 - Examination of the Essential Work of Fracture Method for Paper

AU - Tanaka, Atsushi

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N2 - The "Essential Work of Fracture (EWF)" method to estimate fracture toughness was examined by means of infrared thermography and video-microscopy. Plastic deformation zone appears in three ways when deep double edge notched tension (DENT) specimens are strained under in-plane stress as follows: 1.type(i) - appearing whole through the ligament in a vague and scattering manner, and developing into a circular (or oval) zone even before or at the maximum load point; 2.type(ii) - appearing from the notch tips and amalgamating into a circular (or oval) zone after the maximum load point; 3.type(iii) - appearing from the notch tips and not amalgamating into a circular (or oval) zone until the sheet failure. Specimens with small ligament are likely to belong to type(i), while those with large ligament to type(ii)&(iii). The analysis using video-microscopy showed that crack propagation starts at the maximum load point for the specimens with small ligament length, while it starts earlier before the point with an increase of the ligament length. And it turned out that type(i) specimens belong to the former. According to the original prerequisite, the EWF method is valid if there is a complete yielding of the ligament before the crack propagation. Therefore only type(i) specimens are concluded to be valid for the EWF method.

AB - The "Essential Work of Fracture (EWF)" method to estimate fracture toughness was examined by means of infrared thermography and video-microscopy. Plastic deformation zone appears in three ways when deep double edge notched tension (DENT) specimens are strained under in-plane stress as follows: 1.type(i) - appearing whole through the ligament in a vague and scattering manner, and developing into a circular (or oval) zone even before or at the maximum load point; 2.type(ii) - appearing from the notch tips and amalgamating into a circular (or oval) zone after the maximum load point; 3.type(iii) - appearing from the notch tips and not amalgamating into a circular (or oval) zone until the sheet failure. Specimens with small ligament are likely to belong to type(i), while those with large ligament to type(ii)&(iii). The analysis using video-microscopy showed that crack propagation starts at the maximum load point for the specimens with small ligament length, while it starts earlier before the point with an increase of the ligament length. And it turned out that type(i) specimens belong to the former. According to the original prerequisite, the EWF method is valid if there is a complete yielding of the ligament before the crack propagation. Therefore only type(i) specimens are concluded to be valid for the EWF method.

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Tanaka A, Yamauchi T. Examination of the Essential Work of Fracture Method for Paper. In TAPPI International Paper Physics Conference 1999 Proceedings. TAPPI Press. 1999. p. 171-177