Metallurgical and Materials Transactions A

, Volume 40, Issue 2, pp 486–493 | Cite as

Acoustic Effects on Cyclic-Tension Fatigue of Al-4Cu-1Mg Alloy by Ultrasonic Shear Wave Methods

Article
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Abstract

Cyclic-tension fatigue of aluminum alloy Al-4Cu-1Mg has been determined by usage of vertically-polarized shear wave (SV) reflection and horizontally-polarized shear wave (SH) transmission methods. Internal friction measured by SV method begins to increase rapidly from normalized fatigue ratio of about 0.5, showing dominating interaction of movable dislocations with the waves, as viscoelastic effect. Propagation time and logarithmic damping ratio in the SH method decrease with an increase of the fatigue degree, due to a shift of residual stress as the acoustoelastic effect. The logarithmic damping ratio shows better correlation with the residual-stress shift than the propagation time because acoustic velocity is considered to be significantly affected by pile-up dislocation.

Keywords

Fatigue Residual Stress Internal Friction Acoustic Velocity Fatigue Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2008

Authors and Affiliations

  1. 1.Institute for Materials ResearchTohoku UniversitySendaiJapan
  2. 2.Central Research InstituteToyama Industrial Technology CenterTakaokaJapan

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