Preparation, compression behavior and 3D damage evolution of epoxy syntactic foam with nickel hollow spheres

2021 ◽  
pp. 101009
Author(s):  
Ruoxuan Huang ◽  
Tongcai Zhao ◽  
Henggen Li ◽  
Peifeng Li ◽  
Tong Liu
Keyword(s):  
Damage Evolution ◽  
Hollow Spheres ◽  
Syntactic Foam ◽  
Compression Behavior

The Processing and Structure of Steel Matrix Syntactic Foams Prepared by Infiltration Casting

2018 ◽  
Vol 933 ◽  
pp. 129-135
Author(s):  
Quan Zhan Yang ◽  
Yan Peng Wei ◽  
Zhi Quan Miao ◽  
Peng Gao ◽  
Bo Yu
Keyword(s):  
Metal Matrix ◽  
Heat Insulation ◽  
Hollow Spheres ◽  
Syntactic Foam ◽  
Average Diameter ◽  
Steel Matrix ◽  
Syntactic Foams ◽  
Minimum Diameter ◽  
Microstructure Characteristics ◽  
Multifunctional Properties

Metal matrix syntactic foams are consisting of metal matrix and hollow spheres in closely or randomly packed, which own multifunctional properties with lightweight, damping, heat insulation, energy absorption and have a vast application prospect. Steel matrix can extend the potential of syntactic foams as a materials class to several new fields of application. In this paper, the hollow alumina spheres were introduced into the steel matrix by infiltration casting, the minimum diameter of hollow spheres for infiltration is analyzed in theory, the steel matrix syntactic foams were successfully prepared, which contain two different sphere types with average diameter sizes 3.97mm and 4.72mm, and the average densities of syntactic foams were calculated to be 4.39 (spheres occupy 43.7% of the volume) and 3.74 g/cm3 (spheres occupy 52.1% of the volume), respectively. The microstructure characteristics of the steel matrix syntactic foam were analyzed by means of scanning electron microscopy and energy spectrum.

Analytical and Numerical Study of Crushing of Syntactic Foams Under Uniaxial Compression

2008 ◽  
Author(s):  
Prabhakar Marur
Keyword(s):  
Finite Element ◽  
Uniaxial Compression ◽  
Numerical Study ◽  
Bulk Material ◽  
Hollow Spheres ◽  
Syntactic Foam ◽  
Particulate Composites ◽  
Syntactic Foams ◽  
The Matrix ◽  
Crushing Behavior

Syntactic foams are a class of particulate composites made with hollow microspheres dispersed uniformly in a matrix. By the inclusion of hollow spheres in the matrix, the bulk mechanical properties are improved by limiting the bending of cell edges and localization of inelastic deformation, which is the cause of failure in the case of low-density foams. For the general class of cellular materials, several analytical and experimental methods are available in the literature to characterize the material. In the case of syntactic foams, relatively few methods exist for the computation of effective elastic properties and methods for analyzing the crush behavior of the syntactic foams are rather limited. In this research, the quasi-static crushing behavior of syntactic foam under uniaxial compression is investigated using analytical and numerical methods. To better understand the bulk behavior of syntactic foam, a micromechanical study is conducted to analyze the crushing of hollow spheres in dilute concentration. Initially the stress fields around dilute concentration are derived using continuum mechanics principles and subsequently a limit analysis is performed. To gain further insight into the deformation fields and deformations of cell walls leading to densification, a finite element (FE) analysis is performed. Assuming a periodic repetition of a representative volume of the material would correspond to the bulk material, axisymmetric and 3D finite element models are developed. The numerical computations are compared with the analytical results obtained in this study, and with experimental data reported in the literature. Using the FE models, a parametric study is conducted to investigate the influence of microsphere strength and elastic mismatch between the matrix and the inclusions on the crush behavior of syntactic foam.

scholarly journals Development and characterization of epoxy syntactic foam filled with epoxy hollow spheres

2011 ◽  
Vol 5 (7) ◽  
pp. 653-660 ◽  
Author(s):  
S. S. Samsudin ◽  
Z. M. Ariff ◽  
Z. Zakaria ◽  
A. A. Bakar
Keyword(s):  
Hollow Spheres ◽  
Syntactic Foam ◽  
Foam Filled

Dynamic compression behavior of cenosphere aluminum alloy syntactic foam

2012 ◽  
Vol 42 ◽  
pp. 418-423 ◽  
Author(s):  
Manmohan Dass Goel ◽  
Marco Peroni ◽  
George Solomos ◽  
Dehi Pada Mondal ◽  
Vasant A. Matsagar ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Dynamic Compression ◽  
Syntactic Foam ◽  
Compression Behavior

Fabrication and Properties of Syntactic Magnesium Foams

1998 ◽  
Vol 521 ◽  
Author(s):  
M. Hartmann ◽  
K. Reindel ◽  
R. F. Singer
Keyword(s):  
Compressive Strength ◽  
Energy Absorption ◽  
Wall Thickness ◽  
Volume Fraction ◽  
Hollow Spheres ◽  
Three Dimensional ◽  
Syntactic Foam ◽  
Absorption Efficiency ◽  
Casting Technique ◽  
Energy Absorption Efficiency

ABSTRACTSyntactic magnesium foams which consist of thin-walled hollow alumina spheres embedded in a magnesium matrix were fabricated by infiltrating a three-dimensional array of hollow spheres with a magnesium melt by using a gas pressure-assisted casting technique.The resulting composite contains closed cells of homogeneous and isotropic morphology. The densities of the syntactic magnesium foams were between 1.0 and 1.4 g/cm3. The densities were controlled by variations in the bulk density of the hollow spheres with the volume fraction of spheres kept constant at approximately 63 %.Compressive deformation characteristics of the composites were evaluated with respect to the influence of matrix strength and sphere wall thickness on characteristic variables such as compressive strength, plateau stress and energy absorption efficiency. Differences in the strength of the magnesium-based matrix materials investigated (cp-Mg, AM20, AM50, AZ91) had little influence on the compressive strength of the syntactic foam. However, an increasing relative wall thickness of the hollow ceramic spheres led to a significant strength enhancement. In all cases the ratio between compressive and plateau strength rose with increasing composite strength resulting in decreasing energy absorption efficiency.

Compression behavior of individual thin-walled metallic hollow spheres with patterned distributions of microporosity

2018 ◽  
Vol 734 ◽  
pp. 453-475 ◽  
Author(s):  
Jinliang Song ◽  
Quansheng Sun ◽  
Shengmin Luo ◽  
Sanjay R. Arwade ◽  
Simos Gerasimidis ◽  
...  
Keyword(s):  
Hollow Spheres ◽  
Compression Behavior ◽  
Thin Walled

scholarly journals Synthesis and Characterization of Hollow Glass Sphere Containing Aluminum Syntactic Foam by Spark Plasma Sintering and Hot Pressing

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1266
Author(s):  
Yong Guk Son ◽  
Young Cheol Lee ◽  
Sung Su Jung ◽  
Han Sang Kwon ◽  
Wookjin Lee ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Hot Pressing ◽  
Volume Fraction ◽  
Hollow Spheres ◽  
Syntactic Foam ◽  
Aluminum Matrix ◽  
Sintering Process ◽  
Pressing Method ◽  
Plasma Sintering ◽  
Spark Plasma

The effect of sintering process on the microstructure and the mechanical properties of aluminum syntactic foam were investigated in this study. Two different sintering processes of spark plasma sintering and hot pressing were used. Glass hollow spheres with a size of 50–80 μm was used to fabricate the foams having various volume fractions of the spheres in the range of 10–30%. Microstructural analysis revealed that the glass hollow spheres were uniformly distributed in the aluminum matrix, both in the spark plasma sintered and hot pressed ones. As the volume fraction of the spheres increased from 10 to 30%, the density, micro-hardness and compressive strength of the foams were decreased. In comparison to the foams fabricated by hot pressing method, the spark plasma sintered foams had slightly lower density and mechanical strength. In nanoindentation study, it was found that the aluminum matrix in the foam prepared by the spark plasma sintering process had lower strength than foam prepared by the hot pressing process. This is likely because of shorter sintering time used in the spark plasma sintering process than the hot pressing.

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