Geongsang National University Mechatronics Laboratory

Chi Hyoung Kim

Impact and Sound Absorption of Impact and Sound Absorption of Porous Aluminum and Magnesium AlloyPorous Aluminum and Magnesium Alloy

Mechatronics Lab & iMechatronics Lab & i-cube center Joint Project-cube center Joint Project

School of Nano and Advanced Materials EngineeringSchool of Nano and Advanced Materials Engineering

School of Mechanical EngineeringSchool of Mechanical Engineering

MRSKOREA

MMaterials aterials RResearch esearch SSociety of ociety of KKoreaorea

2/11Geongsang National University Mechatronics Laboratory

Chi Hyoung Kim

AgendaAgenda

• Introduction

• Experimental MethodExperimental Method

• Material for ExperimentExperiment

• Results - Sound Absorption

• Equation for Damping ratio

• Results – Vibration-Absorption

• Conclusion

3/11Geongsang National University Mechatronics Laboratory

Chi Hyoung Kim

IntroductionIntroduction

• A compound metal of foaming Magnesium is possible using a foaming agent.A compound metal of foaming Magnesium is possible using a foaming agent.

• Magnesium is lighter and stiffer than Aluminum.Magnesium is lighter and stiffer than Aluminum.

• Foaming aluminum-alloy has sound-absorption and vibration-absorption.Foaming aluminum-alloy has sound-absorption and vibration-absorption.

• The comparison and analysis of quality is necessary between Al and Mg so The comparison and analysis of quality is necessary between Al and Mg so

that Mg has competitive.that Mg has competitive.

• This present time, Al is applied from the research which it sees consequently, This present time, Al is applied from the research which it sees consequently,

in field of Mg more. It could be applied with the material which is excellent.in field of Mg more. It could be applied with the material which is excellent.

• In order to evaluate a quality basic it used 2 branch methods and it measured In order to evaluate a quality basic it used 2 branch methods and it measured

the quality of material quality of the aluminum and Magnesium.the quality of material quality of the aluminum and Magnesium.

– Tube MethodTube Method

– FFT AnalyzerFFT Analyzer

4/11Geongsang National University Mechatronics Laboratory

Chi Hyoung Kim

Experimental MethodExperimental Method

Tube Method

• The sound-absorbing characteristic test used Tube Method and it tested the aluminum and the MagnesThe sound-absorbing characteristic test used Tube Method and it tested the aluminum and the Magnesium forming metal. ium forming metal. It gave Air gap 10,30,50mm and it measured the sound-absorbing effect.It gave Air gap 10,30,50mm and it measured the sound-absorbing effect.

• The test used the machine and the vibration measured how many diminish quickly using FFT AnalyzerThe test used the machine and the vibration measured how many diminish quickly using FFT Analyzer(Ono Sokki C5-5200). F(Ono Sokki C5-5200). For the comparison of the metal and also the Ingot of the AM60 tested together.or the comparison of the metal and also the Ingot of the AM60 tested together.

FFT Analyzer (Ono Sokki C5-5200)

5/11Geongsang National University Mechatronics Laboratory

Chi Hyoung Kim

Material for ExperimentMaterial for Experiment

Fig.1. Photographs of Specimen for Impact and Sound Absorption Test. a) Aluminum Foam, b) AM60 Foam (Mg) , c) AM60 Ingot (Mg)

aa bb cc

Material Foaming

agentManufacturing process

aPure

AluminumCa

TiH2

Pure aluminum ten until 680 after fusing, it added 2% Ca, it accomplished and it increased a period agitation work and viscosity.After the work is over, at once, it added the TiH2 and agitated( 점증 ) during 60 seconds.Foaming inside the blast furnace(용광로 ) and cooling in the air.

b AM60Ca

CaCO3

Approximate process advanced as the aluminum similarly. Magnesium AM60 ten until 750, it advanced foaming with CaCO3 2%. The foaming was 30 seconds.

c AM60 - Ingot was made from AM60 after fusing the Magnesium and solidify.

6/11Geongsang National University Mechatronics Laboratory

Chi Hyoung Kim

Results - Sound AbsorptionResults - Sound Absorption

• The recording low frequency sound-absorbing characteristic where the measurement result Air gap The recording low frequency sound-absorbing characteristic where the measurement result Air gap will be big became larger. will be big became larger. • The highest point from each condition almost to be near 1. Sound-absorbing characteristic quite is The highest point from each condition almost to be near 1. Sound-absorbing characteristic quite is superior.superior.

Comparison of sound absorption coefficient with a) AM60 b) Pure AlComparison of sound absorption coefficient with a) AM60 b) Pure Al

7/11Geongsang National University Mechatronics Laboratory

Chi Hyoung Kim

Equation for Damping ratioEquation for Damping ratio

Quality factor and bandwidthQuality factor and bandwidth

8/11Geongsang National University Mechatronics Laboratory

Chi Hyoung Kim

Results – Vibration-AbsorptionResults – Vibration-Absorption

Pure Al

0

10

20

30

40

50

60

70

0 1000 2000 3000 4000 5000 6000 7000

Hz

dBE

U/E

U

AM60

(10)

0

10

20

30

40

50

60

0 1000 2000 3000 4000 5000 6000 7000

Hz

dB

EU

/EU

Mg-soild

- 20

- 10

0

10

20

30

40

50

60

0 1000 2000 3000 4000 5000 6000 7000

Hz

dB

EU

/EU

0.63 %4922AM60 Ingot

0.83 %2888AM60

0.72 %3244Pure

Al

Damping ratio Damping ratio (ξ)(ξ)

Natural frequency Natural frequency (Hz)(Hz)

Natural Frequency and Damping ratioNatural Frequency and Damping ratio

Damping ratio of Magnesium Forming metal was higher than Aluminum. (0.11%)Damping ratio of Magnesium Forming metal was higher than Aluminum. (0.11%)

9/11Geongsang National University Mechatronics Laboratory

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Modal Analysis which uses ANSYSModal Analysis which uses ANSYS

Mg-soild

- 20

- 10

0

10

20

30

40

50

60

0 1000 2000 3000 4000 5000 6000 7000

Hz

dB

EU

/EU

10/11Geongsang National University Mechatronics Laboratory

Chi Hyoung Kim

ConclusionConclusion

• The objective of the test is to measure a quality and to compare blow.The objective of the test is to measure a quality and to compare blow.

• Currently foaming Magnesium which are used wide industries and foaCurrently foaming Magnesium which are used wide industries and foaming aluminum research which are applied and actively advanced.ming aluminum research which are applied and actively advanced.

• It evaluates a Magnesium application characteristic.It evaluates a Magnesium application characteristic.

– Sound-absorbing characteristic of Magnesium Forming metal quite is supSound-absorbing characteristic of Magnesium Forming metal quite is superior in the result of Sound Absorption.erior in the result of Sound Absorption.

– Damping ratio of Magnesium Forming metal was higher than Aluminum Damping ratio of Magnesium Forming metal was higher than Aluminum in the result of Vibration-Absorption .in the result of Vibration-Absorption .

• Consequently there is a necessity which will research quality, light weiConsequently there is a necessity which will research quality, light weight and the quality of high-in-tensity of Magnesium Forming Metal.ght and the quality of high-in-tensity of Magnesium Forming Metal.

• In the future the more many research is necessary.In the future the more many research is necessary.

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Chi Hyoung Kim

Q & AQ & A

Thank youThank you