Dynamic Compressive Strength of Aluminum Alloy Foams

2006 ◽  
Vol 326-328 ◽  
pp. 1653-1656
Author(s):  
Zhi Hua Wang ◽  
Hong Wei Ma ◽  
Long Mao Zhao ◽  
Gui Tong Yang
Keyword(s):  
Aluminum Alloy ◽  
Mechanical Response ◽  
Split Hopkinson Pressure Bar ◽  
Compressive Behavior ◽  
Hopkinson Pressure Bar ◽  
Open Cell ◽  
Plastic Strength ◽  
Split Hopkinson ◽  
Dynamic Compressive Strength ◽  
Pressure Bar

The dynamic compressive behavior of open-cell aluminum alloy foams with different length of specimens was investigated using the split Hopkinson pressure bar technique. Plastic strength was measured for aluminum alloy foam specimens having the three cell sizes but similar cell microstructure. Longer specimens exhibited lower mean strength and broader scattering of the strength values than the shorter ones. It can be observed that mechanical response of aluminum alloy foams appear to be dependent of the cell size for both the shorter and longer specimens.

Simultaneous effects of strain rate and temperature on mechanical response of fabricated Mg–SiC nanocomposite

2019 ◽  
Vol 54 (5) ◽  
pp. 659-668 ◽  
Author(s):  
K Rahmani ◽  
GH Majzoobi ◽  
A Atrian
Keyword(s):  
Strain Rate ◽  
Mechanical Response ◽  
Split Hopkinson Pressure Bar ◽  
High Rate ◽  
Dynamic Tests ◽  
Hopkinson Pressure Bar ◽  
Compaction Temperature ◽  
Static Tests ◽  
Split Hopkinson ◽  
Pressure Bar

Mg–SiC nanocomposite samples were fabricated using split Hopkinson pressure bar for different SiC volume fractions and under different temperature conditions. The microstructures and mechanical properties of the samples including microhardness and stress–strain curves were captured from quasi-static and dynamic tests carried out using Instron and split Hopkinson pressure bar, respectively. Nanocomposites were produced by hot and high-rate compaction method using split Hopkinson pressure bar. Temperature also significantly affects relative density and can lead to 2.5% increase in density. Adding SiC-reinforcing particles to samples increased their Vickers microhardness from 46 VH to 68 VH (45% increase) depending on the compaction temperature. X-ray diffraction analysis showed that by increasing temperature from 25℃ to 450℃, the Mg crystallite size increases from 37 nm to 72 nm and decreases the lattice strain from 45% to 30%. In quasi-static tests, the ultimate compressive strength for the compaction temperature of 450℃ was improved from 123% for Mg–0 vol.% SiC to 200% for the Mg–10 vol.% SiC samples compared with those of the compaction at room temperature. In dynamic tests, the ultimate strength for Mg–10 vol.% SiC sample compacted at high strain rate increased remarkably by 110% compared with that for Mg–0 vol.% SiC sample compacted at low strain rate.

INFLUENCE OF THE BONE MORPHOLOGY ON MECHANICAL BEHAVIOR OF HUMAN SKULL FOR TWO STRAIN RATE CASES

2018 ◽  
Vol 18 (04) ◽  
pp. 1850046
Author(s):  
MANAF KARKAR ◽  
CHRISTOPHE MARECHAL ◽  
REMI DELILLE ◽  
GREGORY HAUGOU ◽  
FRANCOIS BRESSON ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Mechanical Response ◽  
Split Hopkinson Pressure Bar ◽  
Parietal Bone ◽  
Hopkinson Pressure Bar ◽  
Bone Morphology ◽  
Split Hopkinson ◽  
Micro Tomography ◽  
Human Skulls ◽  
Pressure Bar

Modeling the mechanical behavior of bone is very complex due to substantial variability of the mechanical response of bone. The objective of this study is to investigate the link between morphology of the human parietal bone and its mechanical behavior in compression with two different strain rates. Five formalin-preserved human skulls were used, and 10 specimens were taken from the parietal bone of each subject. The internal geometry of the osseous material was studied with a micro-tomography device. For mechanical testing, quasi-static (0.02 s–1) tests on a conventional compression machine and dynamic tests (1500 s–1) on a split Hopkinson pressure bar (SHPB) were conducted on 9 mm diameter samples. The results were used to examine relationships between the morphological parameters to find morphological correlations. Linkages between mechanical behavior and morphology of the human parietal bone were also analyzed to develop a behavior model based on micro-structure parameters as determined by micro-scanning.

INTEGRATED STUDY OF DYNAMICAL PROPERTIES OF AK4-1 ALUMINUM ALLOY

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1189-1194 ◽  
Author(s):  
A. M. BRAGOV ◽  
A. Yu. KONSTANTINOV ◽  
A. K. LOMUNOV ◽  
I. V. SERGEICHEV ◽  
A. R. FILIPPOV ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Equations ◽  
Split Hopkinson Pressure Bar ◽  
Experimental Studies ◽  
Dynamic Crack ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Failure Properties ◽  
Strength And Deformation ◽  
Pressure Bar

Results of experimental studies and numerical modeling of high strain rate of aluminum alloy AK4-1 (analog AU2GN) have been presented. Using Split Hopkinson Pressure Bar (SHPB) method stress-strain curves under compression and tension have been obtained. On the basement of these results appropriate parameters of some constitutive equations have been calculated. Strength and deformation material failure properties, dynamic crack resistance, dynamic friction factor for material pair aluminum-titanium have been obtained by carrying out of modificated SHPB tests. A verification of the constitutive equations has been realized by dynamic indentation method and modified Taylor test.

Experimental Research on Dynamic Mechanical Properties of 5083 Aluminum Alloy

2013 ◽  
Vol 535-536 ◽  
pp. 497-500 ◽  
Author(s):  
Zhi Wu Zhu ◽  
Guo Zheng Kang ◽  
Dong Ruan ◽  
Yue Ma ◽  
Guo Xing Lu
Keyword(s):  
Aluminum Alloy ◽  
Strain Rate ◽  
Split Hopkinson Pressure Bar ◽  
High Strength ◽  
Dynamic Mechanical Properties ◽  
Strain Rates ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
5083 Aluminum Alloy

5083 aluminum alloy was investigated with respect to its uniaxial dynamic compressive properties over a range of strain rates using the split Hopkinson pressure bar (SHPB). The dynamic stress-strain curves of this alloy were obtained for strain rates from 1000 s-1 to 6000 s-1. Effects of strain rate, the samples size and anti-impact capability were analyzed. The experimental results show that under impaction loading, 5083 aluminum alloy has a remarkable strengthening response to strain rate and size; in particular, the responded stress increases with increasing strain rate, which implies that this alloy has high strength and high anti-impact capability.

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