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Science in China Series A: Mathematics

, Volume 44, Issue 5, pp 655–661 | Cite as

Effects of macroscopic bulk defects on the damping behaviors of materials

  • Zhonghua Ma
  • Fusheng Han
  • Jianning Wei
  • Junchang Gao
Article
  • 38 Downloads

Abstract

A large number of macroscopic pores or graphite participates were introduced into commercially pure Al and ZA27 alloy by infiltration process to comparatively study the influence of macroscopic defects on the damping behaviors of the materials. The mean diameter of the bulk defects is ( 1.0 ± 0.5) mm, and the volume fractions of pores and graphite particulates are in the range of 50%– 75% and 19%–94%, separately. It is shown that addition of a number of pores or graphite particulates can significantly improve the damping of commercially pure AI, due to the comprehensive effects of the macroscopic and microscopic defects. However, the pores have little effect on the damping capacity of high damping ZA27 alloy, and graphite particulates make the high temperature internal friction peak decrease. It is considered that graphite particulates may repress the intrinsic damping mechanism of ZA27 alloy.

Keywords

damping materials internal friction defects 

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Copyright information

© Science in China Press 2001

Authors and Affiliations

  • Zhonghua Ma
    • 1
  • Fusheng Han
    • 1
  • Jianning Wei
    • 1
  • Junchang Gao
    • 1
  1. 1.Laboratory of Internal Friction and Defects in Solids, Institute of Solid State PhysicsChinese Academy of SciencesHefeiChina

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