Dynamic mechanical behavior of syntactic iron foams with glass microspheres

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 552; pp. 364 - 375
• Main Authors: Peroni, Lorenzo, Scapin, Martina, Avalle, Massimiliano, Weise, Jörg, Lehmhus, Dirk
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 30.08.2012; Elsevier
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Density; Elasticity and anelasticity; Elasticity. Plasticity; Exact sciences and technology; Foams; Glass; Iron; Johnson-Cook model; Lightweight material; Materials science; Mathematical models; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metal foams; Metals. Metallurgy; Micro hollow glass sphere; Microspheres; Physics; Strain-rate sensitivity; Syntactic foam; Syntactic foams; Treatment of materials and its effects on microstructure and properties; Johnson-Cook model; Lightweight material; Strain-rate sensitivity; Syntactic foam; Micro hollow glass sphere; Strain rate sensitivity; Foam glass; Experimental data; Microsphere; Mechanical properties; Cellular material; Iron; Compressive strength; Compression test; Composite material; Hollow sphere; Hollow shape; Experimental result; Thermal resistance; Metal foam; Stress effects; Porosity; Three level system; Strain rate
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2012.05.053

► Syntactic iron foams with different percentages of glass microspheres were analyzed. ► Two types of glass are used to investigate the influence on the material response. ► Experimental data were obtained in compression at different strain-rate levels. ► High strain-rate tests were performed using a standard SHPB setup. ► The data analysis was performed by using an empirical strain-rate sensitive model. In this work, the mechanical behavior of syntactic foams made of hollow glass microspheres mixed in an iron matrix was investigated. This type of material is interesting since, when compared to other types of metal foams, it offers greatly increased quasi-static compressive strength, though at lower maximum porosity and thus higher density. Moreover it maintains the advantages and useful properties of metal foams such as thermal and environmental resistance. In particular, the strain-rate sensitivity response was studied. The experimental characterization was performed by means of compression tests at three strain-rate levels: at the highest strain-rate level a SHPB was used. Type and content of glass microspheres were also studied. The experimental results showed that the compression behavior of syntactic foams, similarly to the other types of foams, is strongly affected by all the examined factors. For what concerns the strain-rate, it was found to increase material characteristics in almost all cases. The influence of the matrix behavior on the composite was identified as the determining parameter in this respect. In order to evaluate the results obtained with the described tests campaign, the experimental data were further elaborated by means of an empirical analytical strain-rate sensitive model. The dependency of the material response on model parameters was widely discussed.