Effects of Stress Triaxiality on Damage Evolution from Pre-Existing Hydrogen Pores in Aluminum Alloy

Hiroyuki Toda; Hideki Tsuruta; Keitaro Horikawa; Kentaro Uesugi; Akihisa Takeuchi; Yoshio Suzuki; Masakazu Kobayashi

doi:10.2320/matertrans.L-M2013841

Hiroyuki Toda, Hideki Tsuruta, Keitaro Horikawa, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, Masakazu Kobayashi

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Keywords: aluminum alloys, micropores, three-dimensional tomography, fracture, hydrogen

JOURNAL FREE ACCESS

2014 Volume 55 Issue 2 Pages 383-386

DOI https://doi.org/10.2320/matertrans.L-M2013841

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Abstract

It has recently been reported that aluminum alloy ductile fracture is dominated by micropore growth, whereas the particle fracture mechanism operates incidentally. The effects of stress triaxiality in front of a notch or crack were here investigated by employing microtomography observations. A fractional dimple pattern area originating in micropores increased with the increase in stress triaxiality on fracture surfaces. This implies that the effects of micropores on mechanical properties are more pronounced in notched and cracked materials.

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