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Mechanical Characterization of Metal FoamsThursday (08.10.2020) 15:30 - 15:50 Room 3 Part of:
Open-cell steel foams are potential candidates for a wide range of applications due to their combination of mechanical and physical-chemical properties. In contrast, the dissemination throughout industrial applications is still limited due to problems in the manufacturing process, high costs, the variability in mechanical properties and how to determine them. Especially the simulation of components using metal foams is still challenging because the mechanical parameter datasets are often incomplete or incorrect. Many studies have been presented within the last decades concerning the mechanical characterization of metal foams, but most approaches are limited to a narrow range of foam materials and are not comparable to each other.
This study within the research project “InSeL” reviews and compares common methods to characterize the mechanical properties of metal foams and presents a novel approach to determine the properties based on the strain hardening behavior. Therefore open-cell foams (steel, aluminum and brass) and syntactic foams with different relative densities have been manufactured and tested in compression under quasi-static loading. The stress-strain curves were analyzed to determine yield strength, plateau stress, strain hardening and densification strain.
Due to smooth transitions and strain hardening in the plateau region in ductile materials, no yield stress or densification strain can be determined exactly or reproducible using common methods. It is found that the investigation of strain hardening behavior could be a valid method to calculate the transitions between the characteristic regions of metal foams.