Study on Quasi-Static Uniaxial Compression Properties and Constitutive Equation of Spherical Cell Porous Aluminum-Polyurethane Composites

Quasi-static uniaxial compression properties and the constitutive equation of spherical cell porous aluminum-polyurethane composites (SCPA-PU composites) were investigated in this paper. The effects of relative density on the densification strain, plateau stress and energy absorption properties of the SCPA-PU composites were analyzed. It is found that the stress-strain curves of SCPA-PU composites consist of three stages: The linear elastic part, longer plastic plateau segment and densification region. The results also demonstrate that both the plateau stress and the densification strain energy of the SCPA-PU composites can be improved by increasing the relative density of the spherical cell porous aluminum (SCPA), while the densification strain of the SCPA-PU composites shows little dependence on the relative density of the SCPA. Furthermore, the applicability of three representative phenomenological models to the constitutive equations of SCPA-PU composites are verified and compared based on the experimental results. The error analysis result indicates that the Avalle model is the best model to characterize the uniaxial compression constitutive equation of SCPA-PU composites.

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Cyclic response of spherical cell porous aluminum alloy-polyurethane composites

Materials Research Express ◽

10.1088/2053-1591/ab4ca7 ◽

2019 ◽

Vol 6 (11) ◽

pp. 115532

Author(s):

Haiying Bao ◽

Aiqun Li

Keyword(s):

Aluminum Alloy ◽

Spherical Cell ◽

Cyclic Response ◽

Porous Aluminum ◽

Polyurethane Composites

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Compressive properties at elevated temperatures of porous aluminum processed by the spacer method

Journal of Materials Research ◽

10.1557/jmr.2005.0415 ◽

2005 ◽

Vol 20 (12) ◽

pp. 3385-3390 ◽

Cited By ~ 11

Author(s):

Masataka Hakamada ◽

Tatsuho Nomura ◽

Yasuo Yamada ◽

Yasumasa Chino ◽

Hiroyuki Hosokawa ◽

...

Keyword(s):

Activation Energy ◽

Relative Density ◽

Stress Exponent ◽

Elevated Temperatures ◽

Chemical Compositions ◽

Compressive Properties ◽

Homogeneous Microstructure ◽

Plateau Stress ◽

Porous Aluminum

Compressive properties at 573–773 K of porous aluminum produced by the spacer method were investigated and compared with those of bulk reference aluminum with the same chemical compositions. The stress exponent and activation energy for deformation at elevated temperatures in the porous aluminum were in agreement with those in the bulk reference aluminum. In addition, the plateau stress of the porous aluminum was comparable to the stress of the bulk reference aluminum upon compensation by the relative density. Therefore, it is conclusively demonstrated that the mechanism of deformation at elevated temperatures in the porous aluminum is the same as that in the bulk reference aluminum. This is likely due to the homogeneous microstructure in the porous aluminum produced by the spacer method.

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The Dependence of the Energy-Absorption Capacity of Metal Hollow Sphere Materials on their Relative Density

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.340-341.389 ◽

2007 ◽

Vol 340-341 ◽

pp. 389-396

Author(s):

T.X. Yu ◽

D. Karagiozova ◽

Z.Y. Gao

Keyword(s):

Yield Strength ◽

Relative Density ◽

Uniaxial Compression ◽

Hollow Sphere ◽

Absorption Capacity ◽

Material Density ◽

Plateau Stress ◽

Energy Absorbing ◽

The Relationship ◽

Theoretical Analyses

Experimental, numerical and theoretical analyses are carried out to obtain the relationship between the stress and relative density of metal hollow sphere (MHS) materials during their large plastic deformation in order to estimate the energy absorbing capacity of these materials under uniaxial compression. Based on a numerical parametric analysis empirical functions of the relative material density are proposed for the elastic modulus, yield strength and ‘plateau’ stress for FCC packing arrangement. Analytical stress-strain dependences are suggested for the yield strength and material strain hardening properties as functions of the relative density of MHS materials under uniaxial compression.

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Mechanical Properties of Functionally Graded Porous Aluminum Consisting of Pure Aluminum and Al-Mg-Si Aluminum Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.741.1 ◽

2017 ◽

Vol 741 ◽

pp. 1-6

Author(s):

Yoshihiko Hangai ◽

Tomoaki Morita ◽

Takao Utsunomiya

Keyword(s):

Aluminum Alloy ◽

Pure Aluminum ◽

Strain Curve ◽

High Energy ◽

Functionally Graded ◽

Compression Tests ◽

Stress Strain ◽

Plateau Stress ◽

Porous Aluminum ◽

Compression Properties

Porous aluminum can potentially satisfy both the lightweight and high-energy-absorption properties required for automotive components. In this study, functionally graded porous aluminum consisting of pure aluminum and Al-Mg-Si A6061 aluminum alloy was fabricated by a sintering and dissolution process. It was found that functionally graded porous aluminum with the same pore structures but different types of aluminum alloy can be fabricated. By performing compression tests on the fabricated functionally graded porous aluminum, it was found that its stress-strain curve initially exhibited a relatively low plateau stress similar to that of uniform porous pure aluminum. Thereafter, the stress-strain curves exhibited a relatively high plateau stress similar to that of the uniform porous A6061 aluminum alloy. Namely, it was found that the compression properties of porous aluminum can be adjusted and optimized by selecting the appropriate type of aluminum alloy.

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Fabrication of Two Layers Porous Aluminum Varying Porosity by Friction Powder Sintering Process and Its Compression Properties

Journal of the Japan Institute of Metals and Materials ◽

10.2320/jinstmet.j2016017 ◽

2016 ◽

Vol 80 (6) ◽

pp. 390-393 ◽

Cited By ~ 2

Author(s):

Yoshihiko Hangai ◽

Ayano Ishihara ◽

Takao Utsunomiya ◽

Osamu Kuwazuru ◽

Nobuhiro Yoshikawa

Keyword(s):

Sintering Process ◽

Porous Aluminum ◽

Compression Properties ◽

Powder Sintering

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Manufacturing of porous aluminum 2024 alloy samples with impressive compression properties

Materials Research Express ◽

10.1088/2053-1591/ab10af ◽

2019 ◽

Vol 6 (7) ◽

pp. 076509 ◽

Cited By ~ 1

Author(s):

Sadeem Abbas Fadhil ◽

Mohsen A Hassan ◽

A S M A Haseeb ◽

Harith I Jaafar ◽

Ekram Atta Al-Ajaj ◽

...

Keyword(s):

Porous Aluminum ◽

Compression Properties ◽

2024 Alloy

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Effect of Compressive Stress on Longitudinal Wave Speed in Cementitious Material

Thermal Hydraulic Problems, Sloshing Phenomena, and Extreme Loads on Structures ◽

10.1115/pvp2002-1156 ◽

2002 ◽

Author(s):

Mary L. Hughes ◽

C. Allen Ross ◽

Voncile L. Ashley

Keyword(s):

Constitutive Equation ◽

Longitudinal Wave ◽

Uniaxial Compression ◽

Wave Speed ◽

Constitutive Relations ◽

Damage Parameter ◽

Primary Objective ◽

Compression Tests ◽

Depth Of Penetration ◽

Longitudinal Wave Speed

The Air Force has been interested for some time in the development of computer codes that accurately predict the penetrator trajectory created when munitions are fired into concrete and geomaterial targets, as well as the resulting depth of penetration. Recent work has focused on experimental research performed to determine quasistatic, dynamic, unconfined and confined material properties for development of an elastic/viscoplastic constitutive equation. This constitutive equation has shown some promise in predicting stress and strains but lacks a consistent damage parameter to predict damage or fractures exhibited by the target material during experimental impact tests. Current damage level predictors that employ a scalar damage parameter are not sufficient to predict the directional damage or fracture that occurs in simple uniaxial compression tests of concrete and geomaterials. Tensorial or directional damage parameters coupled with constitutive relations are necessary for better understanding and accurate prediction of damage exhibited when munitions impact concrete and geomaterials. The primary objective of the study described herein was to identify, quantify and characterize damage parameters associated with certain constitutive responses of cementitious and geologic materials. To that end, longitudinal wave speed and biaxial strain data were collected simultaneously on a series of grout cubes as they were being loaded to failure in uniaxial compression. The results of these tests, and a comparison to existing related data [1, 2] are presented.

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Anisotropic linear elastic parameter estimation using error in the constitutive equation functional

Proceedings of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rspa.2016.0213 ◽

2016 ◽

Vol 472 (2192) ◽

pp. 20160213 ◽

Cited By ~ 8

Author(s):

Shyamal Guchhait ◽

Biswanath Banerjee

Keyword(s):

Constitutive Equation ◽

Elastic Parameter ◽

Linear Elastic ◽

Explicit Material ◽

New Strategy ◽

Minimization Procedure ◽

Parameter Identification Problems ◽

Anisotropic Elastic ◽

Necessary Constraints ◽

Constitutive Tensor

A modified error in the constitutive equation-based approach for identification of heterogeneous and linear anisotropic elastic parameters involving static measurements is proposed and explored. Following an alternating minimization procedure associated with the underlying optimization problem, the new strategy results in an explicit material parameter update formula for general anisotropic material. This immediately allows us to derive the necessary constraints on measured data and thus restrictions on physical experimentation to achieve the desired reconstruction. We consider a few common materials to derive such conditions. Then, we exploit the invariant relationships of the anisotropic constitutive tensor to propose an identification procedure for space-dependent material orientations. Finally, we assess the numerical efficacy of the developed tools against a few parameter identification problems of engineering interest.

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