Designing laminated metal composites for tensile ductility

This contribution draws practical implications of a recently published estimation of the tensile ductility in laminated composites made of two ductile materials, typically metals or alloys, which harden as both the strain and the strain-rate increase. To this end, the literature is surveyed to collect values for the strain hardening exponent, the strain-rate sensitivity and the strength constant for a wide range of engineering metals and alloys. Material combinations that might produce ductile laminated metal composites are then examined in light of the data and theory. A simple graph is proposed, which gives a direct reading of the predicted elongation to failure of composites containing equal volume fractions of any two materials among those surveyed. The resulting plots show material combinations in which a more ductile material can significantly increase, within a laminated metal composite (LMC), the tensile elongation of a less ductile material. In this role, 304 stainless steel and commercial purity iron emerge as sensible possibilities. (C) 2014 Elsevier Ltd. All rights reserved.


Published in:
Materials & Design, 66, 412-420
Year:
2015
Publisher:
Oxford, Elsevier Sci Ltd
ISSN:
0261-3069
Keywords:
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 Record created 2015-02-20, last modified 2018-03-17

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