Fatigue properties of ceramic hollow sphere filled aluminium matrix syntactic foams

Bálint Katona,Gábor Szebényi,Imre Norbert Orbulov

doi:10.1016/j.msea.2016.10.061

Bálint Katona, Gábor Szebényi + Show 1 more

Open Access

https://doi.org/10.1016/j.msea.2016.10.061

Copy DOI

Abstract

Metal matrix syntactic foams, consisting of two grades of aluminium alloys and a set of oxide ceramic hollow spheres, were investigated in the aspect of cyclic loading. The results of the compressive – compressive cyclic loading with the load asymmetry factor of R=0.1 ensured full reliability design data for the investigated material in the lifetime region, while the fatigue limits were determined by staircase method. Based on the measurements the Wöhler curves of the foams were constructed, including the median curves, their confidence boundaries and the fatigue strength. Regarding the matrix material, the softer matrix ensured higher load levels for the fatigue strength than the more rigid matrix. Considering the size of the reinforcing ceramic hollow spheres, larger spheres performed better than the more vulnerable smaller ones. One common failure mode was isolated for the investigated foams: the samples were broken along a shear band, similar to the case of quasi-static loading.

Highlights

Metal matrix syntactic foams (MMSFs) consist of a set of hollow spheres in metal matrix
The results showed that while the early stages of strain accumulation due to fatigue loading were independent of constraint, the rapid strain accumulation stages behaviour were sensitive to the constraint [58]
The produced foams were designated after their constituents, for example Al99.5-GC stands for an MMSF sample with Al99.5 matrix and ~65 vol% of Globocer filler material

Summary

Introduction

Metal matrix syntactic foams (MMSFs) consist of a set of hollow spheres (ceramic, metallic or mixed) in metal matrix. MMSFs can be sorted into two subgroups of materials. On one hand they can be mentioned as particle reinforced metal matrix composites (composite metal foams – CMFs), because they contain particle like hollow spheres within the diameter range Ø0.1...10 mm. They can be sorted as cellular materials (foams), due to the hollow nature of the reinforcement. Gupta et al [11,12,13,14,15,16,17,18,19] have been investigated various MMSFs, including extremely light, SiC hollow sphere reinforced systems. The wear properties have been investigated and described in [34,35,36,37,38,39,40,41]

Objectives

Methods

Results

Conclusion