Gap Test Consequences for Fracture Mechanics of Quasibrittle Materials and Plastic-Hardening Metals

Hoang Thai Nguyen, Ahmet Abdullah Dönmez, Zdeněk P. Bažant*

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Özet

In a new type of fracture experimental setup, which was developed in 2020 and usually referred to as gap test, we use the size effect method to identify the interaction between crack-parallel compressive stresses σxx, σzz, and σxz on the material primary fracture energy Gf and on the characteristic size of the fracture process zone (FPZ) cf. For quasibrittle materials, previous tests showed that σxx could either enhance or reduce Gf to almost zero. In this paper, we adapt the gap tests to study the effect of σxx on fracture of plastic-hardening metals. First, the scaling law of structural strength for this type of material is re-examined and found to be different, showing a transition from the micrometer-scale FPZ through millimeter-scale yielding zone (YZ) to small-scale yielding fracture of large structures. This transition has been formulated by means of asymptotic matching approximations. Next, the gap tests are performed on aluminum alloy using scaled notched three-point-bend beams of depths D = 12–96 mm at three different levels of σxx. Our findings reveal that a crack-parallel stress σxx = 40% of the yield strength will roughly double the fracture energy and triple the size of the YZ.

Orijinal dilİngilizce
Ana bilgisayar yayını başlığıFracture, Fatigue, Failure and Damage Evolution, Volume 3 - Proceedings of the 2022 Annual Conference on Experimental and Applied Mechanics
EditörlerAllison Beese, Ryan B Berke, Garrett Pataky, Shelby Hutchens
YayınlayanSpringer
Sayfalar39-41
Sayfa sayısı3
ISBN (Basılı)9783031174667
DOI'lar
Yayın durumuYayınlandı - 2023
EtkinlikSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2022 - Pittsburgh, United States
Süre: 13 Haz 202216 Haz 2022

Yayın serisi

AdıConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Basılı)2191-5644
ISSN (Elektronik)2191-5652

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???event.eventtypes.event.conference???SEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2022
Ülke/BölgeUnited States
ŞehirPittsburgh
Periyot13/06/2216/06/22

Bibliyografik not

Publisher Copyright:
© 2023, The Society for Experimental Mechanics, Inc.

Finansman

Acknowledgments Funding under NSF Grant No. CMMI-1439960 to Northwestern University is gratefully acknowledged. Partial support was also obtained under ARO grant W911NF-19-1-0034, also to Northwestern.

FinansörlerFinansör numarası
National Science FoundationCMMI-1439960
Army Research OfficeW911NF-19-1-0034
Northwestern University

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