The Effect Of Porosity On The Microstructural Damping Response Of A 6061 Aluminum Alloy

Item

Title
The Effect Of Porosity On The Microstructural Damping Response Of A 6061 Aluminum Alloy
Report Number
WL-TR-91-3078 Volume III, p. GDE-1 thru GDE-20
Creator
Zhang, J.
Gungor, M. N.
Lavemia, E. J.
Corporate Author
Department of Mechanical and Aerospace Engineering, University of California at Irvine
Westinghouse Science and Technology Center
Date
1991
Date Issued
1991-08
Extent
20
Identifier
ADA241313
Format
1 online resource
Abstract
There is a strong experimental evidence suggesting that the presence of pores or cavities in a microstructure may play an important role in the damping response of a material. The present paper reports on the results of a systematic study of the effects of micrometer-sized pores on the damping response of 6061 aluminum alloy. Spray atomization and deposition processing was selected for the present study as a result of its ability to produce a material with a pre-determined amount of non-interconnected, micrometer-sized pores or cavities. Furthermore, by using this synthesis approach, the amount and distribution of pores present in the material may be systematically altered through variations in the processing parameters. 6061 Al alloy was selected for the present study because it has been widely used in structural applications, and because its damping behavior has been studied previously. The damping measurements were accomplished on cantilever beam specimens by using the free vibration decay logarithmic decrement and the resonant vibration half band width techniques. The present results suggest that there is a correlation between the damping response of the material and the amount of porosity present in the microstructure. The damping capacity, logarithmic decrement o, of the as-spray deposited material increased from 1.8 to 2.9% as the amount of porosity increased from 4 to 10%. A correlation between the magnitude of the damping capacity and the average pore diameter was also noted. Overall, the damping response of the spray deposited materials is higher than that reported by other
investigators using the same alloy.
Description
There is a strong experimental evidence suggesting that the presence of pores or cavities in a microstructure may play an important role in the damping response of a material. The present paper reports on the results of a systematic study of the effects of micrometer-sized pores on the damping response of 6061 aluminum alloy. Spray atomization and deposition processing was selected for the present study as a result of its ability to produce a material with a pre-determined amount of non-interconnected, micrometer-sized pores or cavities. Furthermore, by using this synthesis approach, the amount and distribution of pores present in the material may be systematically altered through variations in the processing parameters. 6061 Al alloy was selected for the present study because it has been widely used in structural applications, and because its damping behavior has been studied previously. The damping measurements were accomplished on cantilever beam specimens by using the free vibration decay logarithmic decrement and the resonant vibration half band width techniques. The present results suggest that there is a correlation between the damping response of the material and the amount of porosity present in the microstructure. The damping capacity, logarithmic decrement o, of the as-spray deposited material increased from 1.8 to 2.9% as the amount of porosity increased from 4 to 10%. A correlation between the magnitude of the damping capacity and the average pore diameter was also noted. Overall, the damping response of the spray deposited materials is higher than that reported by other
investigators using the same alloy.
Distribution Classification
1
Distribution Conflict
No
DTIC Record Exists
No
Illinois Tech Related
No
Photo Quality
Complete
Report Availability
Full text available
Type
article
Is Part Of
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)
Media
articleGDE

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Items with "Has Part: The Effect Of Porosity On The Microstructural Damping Response Of A 6061 Aluminum Alloy"
Title Class
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)