Finite element simulations on the mechanical properties of MHS materials

Abstract

Finite element simulations are carried out to examine the mechanical behavior of the metallic hollow sphere (MHS) material during their large plastic deformation and to estimate the energy absorbing capacity of these materials under uniaxial compression. A simplified model is proposed from experimental observations to describe the connection between the neighboring spheres, which greatly improves the computation efficiency. The effects of the governing physical and geometrical parameters are evaluated; whilst a special attention is paid to the plateau stress, which is directly related to the energy absorbing capacity. Finally, the empirical functions of the relative material density are proposed for the elastic modulus, yield strength and plateau stress for FCC packing arrangement of hollow spheres, showing a good agreement with the experimental results obtained in our previous study.

Steel foam for structures: A review of applications, manufacturing and material properties

“…Plastic collapse in uniaxial compression [59] ABC symmetry hollow spheres Plastic deformation Uniaxial compression [60] SC, BCC, FCC, and HCP hollow spheres Plastic deformation Uniaxial compression [61] Random hollow spheres Non-penetration contact, plastic deformation Uniaxial compression [43] Continuum constitutive models of metallic foams have also been developed [67],[68], improved and validated for aluminum foams [69,70], and are available in commercial finite element software such as LS-DYNA and ABAQUS. Key features of the developed models are pressure dependence in the plastic regime, nonlinear strain hardening, and tensile fracture.…”

Researches on compressive mechanical property of thin‐walled hollow spheres structure

“…Currently, there are a lot of researches about thin-walled hollow spheres, including the theories, experiments and numerical simulations of single spheres and multiple spheres combinations [2][3][4][5][6][7][8][9][10][11]. In practical projects, there are three main kinds of connection methods for producing metal hollow sphere materials [12]: (1) To fill the hollow balls into the polymer matrix, such materials are commonly referred to syntactic foams [13], the strength of this material is high, while the density is large; (2) to pile up and sinter the metal hollow spheres by applying heat and pressure, while this method could make the contacts between spheres become diffusion bonded [14][15][16];…”

Characterization of Steel Foams for Structural Components

“…Following experimental results, 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.…”