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Title
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The Effect Of Porosity On The Microstructural Damping Response Of A 6061 Aluminum Alloy
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Report Number
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WL-TR-91-3078 Volume III, p. GDE-1 thru GDE-20
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Creator
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Zhang, J.
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Gungor, M. N.
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Lavemia, E. J.
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Corporate Author
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Department of Mechanical and Aerospace Engineering, University of California at Irvine
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Westinghouse Science and Technology Center
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Date
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1991
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Date Issued
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1991-08
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Extent
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20
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Identifier
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ADA241313
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Format
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1 online resource
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Abstract
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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.
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Description
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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.
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Distribution Classification
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1
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Distribution Conflict
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No
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DTIC Record Exists
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No
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Illinois Tech Related
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No
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Photo Quality
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Complete
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Report Availability
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Full text available
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Type
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article
articleGDE