MECHANISMS AND PREDICTION OF FRACTURE TOUGHNESS ANISOTROPY OF HIGH STRENGTH Al ALLOYS

Acta Metall Sin

1992, Vol. 28

Issue (3): 15-20 DOI:

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MECHANISMS AND PREDICTION OF FRACTURE TOUGHNESS ANISOTROPY OF HIGH STRENGTH Al ALLOYS

LI Huanxi;CHEN Changqi Beijing University of Aeronautics and Astronautics

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LI Huanxi;CHEN Changqi Beijing University of Aeronautics and Astronautics. MECHANISMS AND PREDICTION OF FRACTURE TOUGHNESS ANISOTROPY OF HIGH STRENGTH Al ALLOYS. Acta Metall Sin, 1992, 28(3): 15-20.

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Abstract Contributions of weak grain boundary, cracking path deflection and grainboundary delamination to fracture toughness anisotropy of high strength Al alloys were evalu-ated based upon approaches of fracture mechanics and in conjunction with physical crackingmechanisms. The predicted results are close to those experimentally determined in the literatureand in this work. The strong anisotropy of fracture toughness of high strength Al alloys istherefore attributed mainly to weak grain boundary cracking, cracking path deflection and grainboundary delamination. With the methods of this work, short--transverse fracture toughnessvalues of some semi-products can be estimated from in--plane toughness values and corre-sponding fracture characteristics when it is difficult to be determined experimentally.

Key words: Al alloy fracture toughness anisotropy mechanism prediction

Received: 18 March 1992

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1992/V28/I3/15

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