NDLI: Modeling Ductile Fracture of Al Alloys in Relation with Statistical Distribution of Second Phase Particles

Content Provider	EDP Sciences
Author	Ph. Achon J.C. Ehrstrom A. Pineau
Abstract	Fracture toughness tests have been carried out on two Al alloys (7075 and 7475) containing different amounts of Fe and Si. These materials were tested in T3, T6 and T7 conditions, along six orientations (LT, LS, TL, TS, SL and ST). Large variations in the fracture toughness (20-60 MPa√m) were measured. Mechanical tests on notched specimens were also performed to determine the influence of stress triaxiality ratio on ductility. These specimens were calculated by finite element method. Quantitative metallography was largely used to measure the volume fraction of intermetallic particles (Mg2Si and Fe-rich precipitates) and the statistical distribution of these particles. The Gurson potential is used to interpret these test resulls carried out on volume elements and on cracked specimens. It is shown that the ductility of notched specimens and the measured variations in fracture toughness can be interpreted with the Gurson potential provided that the non homogeneous distribution of intermetallic particles is taken into account. A model has been developed to relate the toughness of the alloys to the yield strength, the critical void growth rate calculated on notched specimen from Rice and Tracey equation and to the mean distance between the clusters of second phase particles.
Ending Page	C6-12
Starting Page	C6-3
Page Count	10
File Format	HTM / HTML PDF
ISSN	11554339
Alternate Webpage(s)	http://dx.doi.org/10.1051/jp4:1996601
Issue Number	C6
Journal	Le Journal de Physique IV
Volume Number	06
DOI	10.1051/jp4:1996601
Language	English
Publisher	EDP Sciences
Publisher Date	1996-10-01
Access Restriction	Subscribed
Rights Holder	EDP Sciences
Content Type	Text
Resource Type	Article

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