Simulation of Aluminium Foam Compressive Properties

2010 ◽  
Vol 97-101 ◽  
pp. 3033-3037
Author(s):  
Ming Juan Zhao ◽  
Long Zhi Zhao ◽  
De Ying Li ◽  
Xiao Qing Zuo ◽  
Jian Sheng Lu
Keyword(s):  
Plastic Deformation ◽  
Compressive Strength ◽  
Yield Strength ◽  
Aluminum Foam ◽  
Metal Foam ◽  
Compressive Yield Strength ◽  
Compressive Behavior ◽  
Compressive Properties ◽  
Al Foam ◽  
Simulation Results

In this paper, the simulation of the commpress properties of Al foam was investigated by finite element methods. The simulation results show that the compressive yield strength of Al foam is consistent with the theoretical model of Gibson and Ashby. The yield strength of Al foam decrease with the increase of porosity, and the yield strength decreases significantly with the increase of porosity. The density of Al foam is proportional to the compressive strength. At a certain porosity, the ratio of sample size and the aperture have an extremely important effects on compressive behavior of aluminum foam. When 4 ≤ D / d <8, with the increase of the ratio of D / d, the plastic deformation plateau and the compressive strength of metal foam is increasing ; on the contrary ,when the ratio> 8, with the increase of the ratio, the plastic deformation plateau is decreasing, the compressive strength keeps constant.

scholarly journals Compressive strength and thermal properties of spark plasma sintered Al-Al2O3 nanocomposite

2018 ◽  
Vol 50 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Nouari Saheb ◽  
Muhammad Khan
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Yield Strength ◽  
Coefficient Of Thermal Expansion ◽  
Testing Machine ◽  
Thermal Constant ◽  
Compressive Properties ◽  
Plasma Sintering ◽  
Spark Plasma

In this work, compressive and thermal properties of aluminum, milled aluminum, and Al-10Al2O3 composite processed via ball milling (BM) and spark plasma sintering (SPS) were investigated. The microstructural features of powders and sintered samples were characterized using optical and scanning electron microscopy. A universal testing machine was used to determine the compressive properties of the consolidated samples. The thermal conductivity and coefficient of thermal expansion of the developed materials were characterized using a hot disc thermal constant analyzer and a dilatometer, respectively. The Al-10Al2O3 composite possessed hardness of 1309.7 MPa, yield strength of 311.4 MPa, and compressive strength of 432.87 MPa compared to hardness of 326.3 MPa, yield strength of 74.33 MPa, and compressive strength of 204.43 MPa for aluminum. The Al-10Al2O3 composite had thermal conductivity value 81.42 W/mK compared to value of 198.09 W/mK for aluminum. In the temperature range from 373 K to 723 K, the composite had lower CTEs ranging from 10 ? 10?6 to 22 ? 10?6/K compared to 20 ? 10?6 to 30 ? 10?6/K for aluminum.

scholarly journals The Overall Effects of AlN Nanoparticle Addition to Hybrid Magnesium Alloy AZ91/ZK60A

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Muralidharan Paramsothy ◽  
Jimmy Chan ◽  
Richard Kwok ◽  
Manoj Gupta
Keyword(s):  
Magnesium Alloy ◽  
Yield Strength ◽  
Failure Strain ◽  
Hot Extrusion ◽  
Longitudinal Direction ◽  
Tensile Yield Strength ◽  
Compressive Yield Strength ◽  
Compressive Properties ◽  
Nanoparticle Distribution ◽  
Magnesium Alloy Az91

A hybrid magnesium alloy nanocomposite containing AlN nanoparticle reinforcement was fabricated using solidification processing followed by hot extrusion. The nanocomposite exhibited similar grain size to the monolithic hybrid alloy, reasonable AlN and intermetallic nanoparticle distribution, nondominant(0 0 0 2)texture in the longitudinal direction, and 17% higher hardness than the monolithic hybrid alloy. Compared to the monolithic hybrid alloy, the nanocomposite exhibited higher tensile yield strength (0.2% TYS) and ultimate tensile strength (UTS) without significant compromise in failure strain and energy absorbed until fracture (EA) (+5%, +5%, −14% and −10%, resp.). Compared to the monolithic hybrid alloy, the nanocomposite exhibited unchanged compressive yield strength (0.2% CYS) and higher ultimate compressive strength (UCS), failure strain, and EA (+1%, +6%, +24%, and +6%, resp.). The overall effects of AlN nanoparticle addition on the tensile and compressive properties of the hybrid magnesium alloy is investigated in this paper.

Single sample method for assessing the Baushinger effect

2020 ◽  
Vol 86 (7) ◽  
pp. 55-58
Author(s):  
A. D. Khvan ◽  
D. V. Khvan ◽  
A. A. Voropaev
Keyword(s):  
Plastic Deformation ◽  
Stress State ◽  
Yield Strength ◽  
Bauschinger Effect ◽  
Calculated Data ◽  
Compressive Yield Strength ◽  
Special Device ◽  
Compression Tests ◽  
Traditional Procedure

The Bauschinger effect is one of the fundamental properties of most metal alloys exposed to plastic deformation under non-monotonic loading. Development of the methods for quantifying this effect is one the important issues of the theory of plasticity. Calculation of the parameter characterizing the aforementioned effect is required for determination of the stress state in plastically deformable blanks upon pressure metal treatment. The value of the parameter (determined in standard tensile tests followed by subsequent compression of samples) is defined by the ratio of the conditional yield strength of the sample under compression to the value of the preliminary tensile stress. A series of cylindrical samples (~10 pcs.) is usually taken for tensile-compression tests. According to the traditional procedure, long-size standard specimens are pre-stretched to various degrees of plastic deformation. After that short specimens are cut out from those specimens for compression tests to determine the conditional compressive yield strength with a tolerance of 0.2% for plastic deformation. Such a procedure is rather time consuming and expensive. We propose and develop a new single-model method for estimating the Bauschinger effect which consists in testing of a single long-size specimen for tension followed by compression of the specimen in a special device providing deformation of a previously stretched specimen without flexure under conditions of a linear stress state. The device was designed, manufactured and underwent the appropriate tests. The device contains supporting elements in the form of conical-shaped sectors that prevent flexure of a long cylindrical specimen upon compression, a ratio of the working part length to diameter ranges from 5 to 10. The results of experimental determination of the parameter β characterizing the indicated effect are presented. The results of comparing the values of the parameter β determined by the developed and traditional methods revealed the possibility of determining the parameter β using the proposed method. To reduce the complexity of performing tests related to determination of the parameter β we approximated it in the form of an exponent as a function of the magnitude of plastic deformation and determine the only one value of β0 under plastic deformations exceeding 0.05. In this regard, β0 can be considered a new characteristic of the material. The calculated data are in good agreement with the experimental results. The values of β0 are determined for a number of studied steel grades.

Quasi-Static Compressive Characteristics of Cu-Containing Closed-Cell Aluminum Foams

2017 ◽  
Vol 748 ◽  
pp. 173-180
Author(s):  
Jing Wang ◽  
Zan Zhang ◽  
Jian Ding ◽  
Chuan Rong Qiu ◽  
Xing Chuan Xia ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Compressive Strength ◽  
Aluminum Foam ◽  
Pure Aluminum ◽  
Aging Treatment ◽  
Compressive Properties ◽  
Aluminum Foams ◽  
Commercially Pure ◽  
Closed Cell ◽  
Heat Treated

Closed-cell aluminum foam with different percentages of Cu was prepared by melt foaming method.The effect of Cu element on the quasi-static compressive properties of aluminum foam was investigated, both under as-cast and heat-treated conditions. The results showed that Cu element distributed in cell wall matrix mainly in the forms of Al-Cu solid solutions and AlCu3, Al6.1Cu1.2Ti2.7 intermetallics. Meanwhile, Cu-containing foams possessed much higher compressive strength than the commercially pure aluminum foams. Additionally, proper heat treatment could further improve the yield strength of Cu-containing foams and the effect of aging treatment was more obvious than the homogenizing heat treatment under the present conditions and the reasons were discussed.

Enhancement of Collapse Resistance of UOE Pipe Based on Systematic Exploitation of Thermal Cycle of Coating Process

2008 ◽  
Author(s):  
Andreas Liessem ◽  
Johannes Groß-Weege ◽  
Steffen Zimmermann ◽  
Gerhard Knauf
Keyword(s):  
Plastic Deformation ◽  
Thermal Treatment ◽  
Yield Strength ◽  
Thermal Cycle ◽  
Compressive Yield Strength ◽  
Coating Process ◽  
Cold Plastic Deformation ◽  
Production Route ◽  
Collapse Strength ◽  
Collapse Resistance

The present paper discusses recent results of an ongoing study on the effect of thermal treatment on collapse strength of cold formed pipes, for instance those following the UOE production route. It has been recognized that thermal treatment as encountered during thermal cycle of pipe coating processes may compensate the reduction of compressive yield strength owing to cold plastic deformation induced during forming. This effect has been systematically analyzed. Enhancement of collapse resistance exploiting the thermal cycle of coating process was studied based on experimental evidence, Finite Element simulations as well as theoretical analysis. It is herein shown that appropriate thermal treatment manifests itself positively with respect to compressive yield strength, leading to significantly improved collapse pressures. As a result fabrication factors of one and even higher may be applicable.

The Effect of Boron on the Microstructure of Ni2 AITi.

1988 ◽  
Vol 133 ◽  
Author(s):  
S. R. Schuon ◽  
V. Rehzets
Keyword(s):  
Compressive Strength ◽  
Yield Strength ◽  
Room Temperature ◽  
Single Phase ◽  
Strengthening Mechanism ◽  
Crack Deflection ◽  
Compressive Yield Strength ◽  
Nominal Composition ◽  
Dispersion Strengthening ◽  
Strengthening Factor

ABSTRACTIngots with a nominal composition of Ni–34a/o Al–15a/o Ti + O.Ow/o B, 0.05w/o B, 0.1w/o B or 0.3w/o B were prepared and compression tested at a strain rate of 1.7 x 10–7/s at room temperature, 650°C, 870°C, and 1000°C in air. Alloys were single-phase Ni2 AITi and borides were contained in all compositions containing boron. The compressive yield strength and the ultimate compressive strength of NA2AITi containing boron is strongly affected by the type and distribution of borides. The formation of TiB2 at 0.3w/o B increased the strength at room teperature, 650°C, 870°C, ang 1000°C, while formation of a TiB-Ni2 AITi eutectic at 0.05w/o and 0.lw/o B decreased strength at all temperatures. Crack deflection by TiB2 is an important strengthening mechanism at room temperature and 650°C. However, at 1000°C, dispersion strengthening may be an important strengthening factor.

In Situ Formation of Ti Matrix Composites Reinforced Nanometric TiC by Powder Metallurgy Technique

2014 ◽  
Vol 1061-1062 ◽  
pp. 100-103
Author(s):  
Chun Ming Wang ◽  
Si Yu Gao ◽  
Su Fen Xiao ◽  
Yun Gui Chen
Keyword(s):  
Compressive Strength ◽  
Powder Metallurgy ◽  
Yield Strength ◽  
Preparation Method ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
Compressive Properties ◽  
In Situ Formation ◽  
Tic Nanoparticles

In-situ formation of nanometric TiC reinforcements based on Ti matrix composites were researched by a novel preparation method, which including glucose polymers coating and powder metallurgy. The results showed that TiC nanoparticles were homogeneously distributed in Ti matrix, and the as-sintered Ti-TiC composites displayed excellent compressive properties which ultimate compressive strength was 2500 MPa, yield strength was 1450 MPa and strain to fracture was 53 %.

The effect of plastic deformation on mechanical properties of aluminium matrix composites reinforced with 2D crystals

2020 ◽  
Vol 111 (8) ◽  
pp. 632-638
Author(s):  
Jaroslaw Wozniak ◽  
Mateusz Petrus ◽  
Marek Kostecki ◽  
Tomasz Cygan ◽  
Andrzej Olszyna
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Yield Strength ◽  
Physical And Mechanical Properties ◽  
Compressive Yield Strength ◽  
Multilayer Graphene ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
2D Crystals

Abstract In this study, AA6061 matrix composites reinforced with multilayer graphene and MoS2 were analyzed. The composites were prepared by powder metallurgy using the spark plasma sintering and spark plasma texturing methods. Microstructure, physical and mechanical properties were investigated and compared with unreinforced AA6061 sinter and AA6061 sheet plate. The results showed that the application of spark plasma texturing positively influences the relative density and compressive yield strength of AA6061 matrix composites. Moreover, in composites with MoS2, significant differences in compressive yield strength between the centre and the edge of the sintered compacts were noticed. These differences are related to the formation of the MoAl12 phase as a result of the temperature gradient generated in the graphite die during sintering by the spark plasma texturing.

Compressive Properties of Hot-Rolled Mg-Zr-Ca Alloys for Biomedical Applications

2011 ◽  
Vol 197-198 ◽  
pp. 56-59 ◽  
Author(s):  
Ying Long Zhou ◽  
Dong Mei Luo ◽  
Wang Yu Hu ◽  
Yun Cang Li ◽  
Peter D. Hodgson ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Biomedical Applications ◽  
Compressive Modulus ◽  
Human Bone ◽  
Compressive Yield Strength ◽  
X Ray Diffraction ◽  
Compressive Properties ◽  
X Ray ◽  
Hot Rolled ◽  
Compressive Tests

This paper investigated the microstructures and compressive properties of hot-rolled Mg-Zr-Ca alloys for biomedical applications. The microstructures of the Mg-Zr-Ca alloys were examined by X-ray diffraction analysis and optical microscopy, and the compressive properties were determined from compressive tests. The experimental results indicate that the hot-rolled Mg-Zr-Ca alloys with 1% Ca are composed of one single a phase and those alloys with 2% Ca consist of both Mg2Ca and a phase. The hot-rolled Mg-Zr-Ca alloys exhibit typical elongated microstructures with obvious fibrous stripe, and have much higher compressive strength and lower compressive modulus than pure Mg. All the studied alloys have much higher compressive yield strength than the human bone (90~140 MPa) and comparable modulus with the human bone, suggesting that they have a great potential to be good candidates for biomedical applications.

“Recoil” Compressive Strength Test and the Evolution of Compressive Behavior in PAN-Based Carbon Fibers

1993 ◽  
Vol 305 ◽  
Author(s):  
Hao Jiang ◽  
S. Damodaran ◽  
A. S. Abhiraman ◽  
P. Desai ◽  
S. Kumar
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Carbon Fibers ◽  
Shear Failure ◽  
Relative Rate ◽  
Fracture Morphology ◽  
Test Results ◽  
Compressive Behavior ◽  
Compressive Properties ◽  
Compressive Strength Test

AbstractThe compressive properties of PAN-based carbon fibers were measured with the tensile recoil method. The recoil fracture morphology was also examined. In addition to the axial compression, flexure during recoil affects the test results. Compressive failure may be caused by shear failure and/or bending buckling of the microfibrils/fibrils. Study of the evolution of compressive and other mechanical properties discloses that, in general, the compressive strength bears a similar tendency to the tensile strength and torsion modulus up to the carbonization temperature of 1500 °C. However, the relative rate of evolution is different. To some extent, the bending buckling mechanism may relate to the structural units which govern the tensile strength.

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