Quasi-Static and Impact Response of Graded Aluminium Matrix Syntactic Foams

2018 ◽  
Vol 933 ◽  
pp. 246-255
Author(s):  
Chen Liang ◽  
Yu Yuan Zhao
Keyword(s):  
Impact Response ◽  
Aluminium Matrix ◽  
Syntactic Foams ◽  
Stress Plateau ◽  
Static Compression ◽  
Plateau Stress ◽  
Brittle Layer ◽  
The Impact ◽  
Graded Structures ◽  
Quasi Static Compression

The behaviour of aluminium matrix syntactic foams (AMSFs) with homogeneous and graded structures have been studied under quasi-static compression and impact. Particle size of ceramic microspheres and impact velocity had significant effects on the static and impact responses. Smaller microspheres led to higher strength but lower toughness. The compressive yield stress, plateau stress and specific energy absorption of the graded AMSF specimens were approximately the averages of the constituent layers, following the rule of mixture, although the order of the layers had some influence on the compressive behaviour. The syntactic foams were brittle under impact, no matter whether they were brittle or ductile in quasi-static compression. They had higher peak stresses and absorbed more energy in impact than in quasi-static compression. The location of the most brittle layer of the small ceramic microspheres had a significant effect on the impact failure pattern and sequence of the three-layer graded AMSFs.

A NONLINEAR STRAIN-DEPENDENT VARIABLE-ORDER FRACTIONAL MODEL WITH APPLICATIONS TO ALUMINUM FOAMS

Fractals ◽  
2021 ◽  
Author(s):  
WEI CAI ◽  
PING WANG
Keyword(s):  
Power Law ◽  
Variable Order ◽  
Aluminum Foams ◽  
Static Compression ◽  
Fractional Model ◽  
Comparative Results ◽  
The Impact ◽  
Strain Responses ◽  
Strain Dependent ◽  
Quasi Static Compression

In this paper, a power-law strain-dependent variable order is first incorporated into the fractional constitutive model and employed to describe mechanical behaviors of aluminum foams under quasi-static compression and tension. Comparative results illustrate that power-law strain-dependent variable order is capable of better describing stress–strain responses compared with the traditional linear one. The evolution of fractional order along with the porosities or relative densities can be well qualitatively interpreted by its physical meaning. Furthermore, the model is also extended to characterize the impact behaviors under large constant strain rates. It is observed that fractional model with sinusoidal variable order agrees well with the experimental data of aluminum foams with impact and non-impact surfaces.

Dynamic Compression Behavior of Lotus-Type Porous Iron

2010 ◽  
Vol 658 ◽  
pp. 193-196
Author(s):  
Masakazu Tane ◽  
Tae Kawashima ◽  
Keitaro Horikawa ◽  
Hidetoshi Kobayashi ◽  
Hideo Nakajima
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Dynamic Compression ◽  
Testing Machine ◽  
Porous Iron ◽  
Compression Tests ◽  
Hopkinson Pressure Bar ◽  
Static Compression ◽  
Plateau Stress ◽  
Stress Region ◽  
Quasi Static Compression

Dynamic and quasi-static compression tests were conducted on lotus-type porous iron with porosity of about 50% using the split Hopkinson pressure bar method and universal testing machine, respectively.　In the dynamic compression parallel to the pore direction, a plateau stress region appears where deformation proceeds at nearly constant stress, while the plateau stress region does not appear in the quasi-static compression. The plateau stress region is probably caused by the buckling deformation of matrix iron which occurs only in the dynamic compression. In contrast, the compression perpendicular to the orientation direction of pores exhibits no plateau-stress regions in the both dynamic and quasi-static compression.

Effect of Laser Forming on the Energy Absorbing Behavior of Metal Foams

2021 ◽  
pp. 1-29
Author(s):  
Tom Zhang ◽  
Yubin Liu ◽  
Nathan Ashmore ◽  
Wayne Li ◽  
Y. Lawrence Yao
Keyword(s):  
Metal Foam ◽  
Laser Forming ◽  
Compression Tests ◽  
Forming Process ◽  
Static Compression ◽  
Closed Cell ◽  
Similarities And Differences ◽  
Energy Absorbing ◽  
The Impact ◽  
Quasi Static Compression

Abstract Metal foam is light in weight and exhibits an excellent impact absorbing capability. Laser forming has emerged as a promising process in shaping metal foam plates into desired geometry. While the feasibility and shaping mechanism has been studied, the effect of the laser forming process on the mechanical properties and the energy absorbing behavior in particular of the formed foam parts has not been well understood. This study comparatively investigated such effect on as-received and laser formed closed-cell aluminum alloy foam. In quasi-static compression tests, attention paid to the changes in the elastic region. Imperfections near the laser irradiated surface were closely examined and used to help elucidate the similarities and differences in as-received and laser formed specimens. Similarly, from the impact tests, differences in deformation and specific energy absorption were focused on, while relative density distribution and evolution of foam specimens were numerically investigated.

Numerical Simulations of Micromechanical Properties of Al Alloy/SiC Hollow Sphere Syntactic Foams Composites

2013 ◽  
Vol 365-366 ◽  
pp. 1054-1057
Author(s):  
Zheng Jie Lu ◽  
Han Long Wei ◽  
Shu De Liao ◽  
Sen Kai Lu
Keyword(s):  
Hollow Sphere ◽  
Al Alloy ◽  
Syntactic Foams ◽  
The Finite Element Method ◽  
Simulation Code ◽  
Band Formation ◽  
Static Compression ◽  
Plateau Stress ◽  
Micromechanical Properties ◽  
The Matrix

The micromechanical properties of a Al alloy/SiC hollow sphere syntactic foams composite material have been studied using the Solidwork simulation code applied the finite element method (FEM). The simulated results have shown that the values of quasi-static compressive strength, plateau stress, and densification strain are 175 MPa, 120 MPa and 0.50, respectively. The general trend of dynamic stress–strain graphs is similar to quasi-static compression graphs. The compressive properties of the composite are not strain rate sensitive. The simulated peak strength value is ≈140 MPa. Al matrix and SiC hollow sphere exhibit different mechanical behaviour. The ultimate stress is found near the interface of composites. The failure initiates by the fracture of weak particles, some of the cracks can propagate to the matrix as well. Shear band formation in the matrix and shearing of SiChs lead to the major failure activity.

Quasi-State Compressive Properties of Functionally Graded Aluminum Matrix Syntactic Foams

2021 ◽  
Vol 1035 ◽  
pp. 878-883
Author(s):  
Ming Ming Su ◽  
Mo Qiu Li ◽  
Thomas Fiedler ◽  
Hai Hao
Keyword(s):  
Volume Fraction ◽  
Hollow Spheres ◽  
Aluminum Matrix ◽  
Stir Casting ◽  
Functionally Graded ◽  
Small Range ◽  
Syntactic Foams ◽  
Compression Tests ◽  
Static Compression ◽  
Plateau Stress

The uniform aluminum matrix syntactic foams (SFs) were prepared by the stir casting method, with alumina hollow spheres (2-3 mm and 3-4 mm) and expanded glass (2-3 mm) as reinforcements, and ZL111 aluminum alloy as matrix. The functionally graded aluminum matrix syntactic foams (FG-SFs) were obtained by superimposing two uniform aluminum matrix syntactic foams. Quasi-static compression tests were performed. The plateau stress of FG-SFs containing only hollow spheres decreased slightly with increasing volume fraction of SF containing 3-4 mm hollow spheres. The FG-SFs containing 2-3 mm hollow spheres and 2-3 mm expanded glass showed the highest plateau stress. The energy absorption behavior of all samples fluctuated in a small range. The initial position of shear band depended on the volume fraction of uniform aluminum matrix syntactic foams, reinforcement type and size. The cracks always appeared first in the uniform aluminum matrix syntactic foams containing expanded glass.

Effect of Glass Microballoons Size on Compressive Strength of Syntactic Foams

2011 ◽  
Vol 321 ◽  
pp. 7-10 ◽  
Author(s):  
Zhuo Chen ◽  
Zhi Xiong Huang ◽  
Yan Qin ◽  
Min Xian Shi ◽  
Qi Lin Mei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Compressive Strength ◽  
Size Distribution ◽  
Syntactic Foam ◽  
Syntactic Foams ◽  
Static Compression ◽  
Distribution Ranges ◽  
Glass Microballoons ◽  
Quasi Static Compression

In this work, syntactic foams made of microballoons having same wall thickness ratio but with different particle size was prepared. Microballoons of three size distribution ranges were selected .The property of the syntactic foams were studied by quasi-static compression test. The experimental results show the microballoons size doesn’t influent the mechanical properties of the syntactic foam significantly. The failure mode of the syntactic foams was also studied in this work.

Mechanical Properties of Iron Hollow Sphere Reinforced Metal Matrix Syntactic Foams

2015 ◽  
Vol 812 ◽  
pp. 3-8 ◽  
Author(s):  
Attila Bálint ◽  
Attila Szlancsik
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix ◽  
Interface Layer ◽  
Inert Gas ◽  
Syntactic Foams ◽  
Test Results ◽  
Static Compression ◽  
The Matrix ◽  
Infiltration Technique ◽  
Quasi Static Compression

Metal matrix syntactic foams (MMSFs) were produced by low-pressure inert gas infiltration technique. Matrixes of the produced syntactic foams were Al99.5, AlSi12, AlMgSi1 and AlCu5 respectively, and each was reinforced by pure Fe based hollow. The produced blocks were investigated by optical and scanning electron microscopy. The microstructural investigations revealed proper infiltration with small amount of unwanted voids and an effective and thin interface layer between the matrix materials and the reinforcing spheres. The produced MMSFs were also tested under quasi-static compression loading to get characteristic mechanical properties. The test results showed that the MMSFs with iron spheres have outstanding mechanical properties compared to ‘conventional’ foams.

Quasi-Static and Dynamic Compressive Behaviors of Closed-Cell Stochastic Foams Based on Voronoi Model

2019 ◽  
Author(s):  
Jianyong Chen ◽  
Jun Liu ◽  
Yuansheng Cheng ◽  
Pan Zhang
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
Dynamic Compression ◽  
Voronoi Tessellation ◽  
Three Dimensional ◽  
Static Compression ◽  
Plateau Stress ◽  
Closed Cell ◽  
Collapse Mode ◽  
Quasi Static Compression

Abstract Closed-cell stochastic foams are widely used in engineering field due to the excellent energy absorption capability. In this paper, the crushing response of three dimensional closed-cell foams is investigated under quasi-static and dynamic compression loading. Voronoi tessellation is employed to generate the mesoscale geometric models of closed-cell stochastic foams, and subsequently numerical analysis is carried out using LS-DYNA software. Results reveal that the plateau stress of Voronoi model under quasi-static compression linearly increases with the increase of relative density. In addition, the mechanical properties of Voronoi model under quasi-static and dynamic compression are related to a shear band collapse mode and a layer-wise collapse mode, respectively. The plateau stress and the densification strain under high-speed loading are higher than those under quasi-static and low-speed loading.

scholarly journals Effect of Layer Thickness in Layered Aluminum Matrix Syntactic Foam

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4172 ◽  
Author(s):  
Chenhao Qian ◽  
Chen Liang ◽  
Ziyang He ◽  
Weixi Ji
Keyword(s):  
Energy Absorption ◽  
Impact Energy ◽  
Syntactic Foam ◽  
Aluminum Matrix ◽  
Peak Stress ◽  
Impact Response ◽  
Syntactic Foams ◽  
Layer Number ◽  
Failure Propagation ◽  
The Impact

This work experimentally investigates the effect of layered structure on the static and impact response of a new layered syntactic foam developed for impact energy absorption. The layered syntactic foam had the same density of 1.6 g/cm3 and the same components of 50% large spheres (L) and 50% small spheres (S) with different structures from two layers to five layers. The impact response and energy absorption were investigated by drop-weight impact tests. Under static loading, more layers led to higher yield stress and lower energy absorption. There were three types of progressive failures of layered syntactic form under impact loading. The failure propagation was examined and found to be dependent on the layer number and impact energy. Interestingly, layered syntactic foam absorbed more energy than both of its components in terms of ductility. The ductility of layered syntactic foam decreased with the increase in layer number. The peak stress of layered syntactic foam increased with the increase in layer number. Two-layered syntactic foam LS had the highest ductility under 60 J/g impact, as well as an energy absorption of 35 J/g, compared to other layered syntactic foams. Specifically, its component L had a ductility under 70 J/g and an energy absorption of 25 J/g, while component S had a ductility under 10 J/g and an energy absorption of 10 J/g.

The effect of structural parameters on quasi-static compression performance of bi-directional trapezoid honeycomb

2021 ◽  
pp. 002199832110095
Author(s):  
Youdong Xing ◽  
Siyi Yang ◽  
Zhongfang Li ◽  
Wan Ma ◽  
Yukun An
Keyword(s):  
Cell Size ◽  
Energy Absorption ◽  
Structural Parameters ◽  
Great Influence ◽  
Honeycomb Structure ◽  
Stress Plateau ◽  
Static Compression ◽  
Compression Performance ◽  
Quasi Static Compression ◽  
Cell Thickness

A porous material –Bi-directional Trapezoid Honeycomb (BDTH) which is different from the traditional honeycomb structure, has same energy absorption properties in the Y and Z directions was studied. The structural parameters (cell size, cell thickness) have a great influence on the compression performance. 3 kinds of cell size ( a) and 4 kinds of cell thickness ( t0) totally 7 kinds of BDTH were manufactured. The quasi-static compression test was carried out with experiment and numerical simulation, and the results were obtained. The effects of material deformation modes and energy absorption are analyzed. Next, based on Gibson-Ashby theory, the relationship between density, initial peak stress, plateau stress, densification strain and the ratio of t0/a were deduced.

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