Abstract
Experimentally measured mechanical properties of hollow sphere steel foam are the subject of this paper. The characterization of the hollow sphere foam encompasses compressive yield stress and densification strain, compressive plastic Poisson’s ratio, and compressive unloading modulus, as well as tensile elastic modulus, tensile unloading modulus, tensile yield stress, and tensile fracture strain. Shear properties are also included. These tests provide sufficient information to allow calibration of a macroscopic, continuum constitutive model. Calibrated foam plasticity parameters are tabulated, and unique feature of foam plasticity are explained. Also, initial development of mesoscale simulations, which explicitly model voids and sintered hollow spheres, is reported. This work is part of a larger effort to help the development of steel foam as a material with relevance to civil engineering applications.
Highlights
This article presents an experimental characterization of the mechanical properties of a hollow sphere steel foam manufactured by the Fraunhofer Institute in Dresden, Germany
The characterization of the hollow sphere foam encompasses more material properties than do most reports in the open literature, which focus on the compressive yield stress and densification strains [1,2,3]
Tests #2 and #3 showed that there is a significant difference between the apparent stiffnesses calculated from extensometer data and crosshead displacement data (3150 MPa vs. 700 MPa), suggesting that hollow sphere steel foam experiences strong localized strain near the platens
Summary
This article presents an experimental characterization of the mechanical properties of a hollow sphere steel foam manufactured by the Fraunhofer Institute in Dresden, Germany. Computational models of hollow sphere steel foam are introduced. The characterization of the hollow sphere foam encompasses more material properties than do most reports in the open literature, which focus on the compressive yield stress and densification strains [1,2,3]. The additional material properties, which include compressive plastic Poisson’s ratio, compressive unloading modulus, tensile elastic modulus, tensile unloading modulus, tensile yield stress, and tensile fracture strain, as well as shear properties, provide sufficient information to allow calibration of a macroscopic, continuum, constitutive model for the material
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