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Syntactic Iron Foams – On Deformation Mechanisms and Strain‐Rate Dependence of Compressive Properties
Author(s) -
Peroni Lorenzo,
Scapin Martina,
Avalle Massimiliano,
Weise Jörg,
Lehmhus Dirk,
Baumeister Joachim,
Busse Matthias
Publication year - 2012
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201200160
Subject(s) - syntactic foam , materials science , glass microsphere , composite material , deformation (meteorology) , strain rate , split hopkinson pressure bar , context (archaeology) , compressive strength , plateau (mathematics) , porosity , stress (linguistics) , bar (unit) , strain (injury) , microsphere , medicine , paleontology , mathematical analysis , linguistics , philosophy , physics , mathematics , chemical engineering , meteorology , biology , engineering
Syntactic iron foams are produced by metal injection moulding from pure Fe powder and two grades of commercial glass microspheres. Mechanical performance of samples containing 5/10/13 wt% of microspheres is compared to unfilled reference material properties at strain‐rates covering 6 orders of magnitude, including Split Hopkinson Pressure Bar (SHPB) experiments. Complex mechanical behavior including strengthening effects of microspheres leading to a plateau strength level which is nearly independent of porosity as well as strain‐rate sensitivity of compressive properties are observed. Typical plateau onset stress levels exceed equivalent characteristics of most comparable cellular metallic materials, reaching between approximately 220 and 270 MPa under quasi‐static conditions, depending on amount and type of added microspheres. A qualitative explanation of significant events in the deformation sequence as reflected in the stress–strain‐curve is offered and discussed in the context of existing studies on syntactic foams. A course for further investigations to verify this hypothesis is suggested.