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VIBRATION DAMPING CAPACITY OF
AZ91D MAGNESIUM ALLOYS
ZHANG Jin1 TAO Yanling2
SUN Zhifu1 FU Lijuan1 SHI Quan1
(1. School of Material Science and Engineering, Chongqing Institute of Technology,
Chongqing 400050;
2. Material Science and Engineering Center, Chemical Industry Press, Beijing 100029)
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Abstract: To
understand damping capacity of magnesium at different frequency and
amplitude of vibration, damping-frequency curves of AZ91D, AZ31,
aluminum alloy and steel are measured at room temperature. It reveals
that AZ91D has the best damping capacity among the mentioned four
materials and a damping peak is found at frequency 6 Hz. To know its
damping action in real use, the dynamic mechanical characteristics of
magnesium engine box cover and aluminum engine box cover are studied by
means of the experimental modal analysis technique. It is found that the
first and the second stages of modal damping ratio of magnesium engine
box cover are 17.6% and 41.3%, higher than the aluminum engine box cover
individually. The first and the second stages of the modal mass of
magnesium engine box cover are 45.0％ and 15.3%, higher than the aluminum
engine box cover individually. These reveal that magnesium alloys have
better shock absorption and better stability in appliance.
Key words: Magnesium alloy Damping
Experimental modal analysis
CLC No: TG146
重庆市科委重点攻关资助项目(2002032—7228). Received 20051010, received in revised form 20060708
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