RELATION BETWEEN DEVELOPMENT OF DEFECTS IN MATERIALS AND ACOUSTIC EMISSION

This article presents a theoretical model for the description of discrete acoustic emission caused by a developing microscopic defect in a stressed material. The development of the defect is described by temporal and spatial variation of the elastic constant. The elastodynamic phenomenon following these variations is described by a one-dimensional scalar field of displacement. As the basis for theoretical treatment, Green's function formalism and the born approximation are applied. In spite of the crude approximations, the model shows how the generation, propagation and detection of acoustic emission bursts can be described in common, and how acoustic emission analysis can be compared with ultrasonic defectoscopy. For this purpose the properties of acoustic emission generated by microscopic defects are discussed in more detail.(a) (TRRL)

  • Corporate Authors:

    IPC Science and Technology Press Limited

    IPC House, 32 High Street
    Guildford, Surrey  England 
  • Authors:
    • Grabec, I
  • Publication Date: 1980-1

Media Info

  • Features: References;
  • Pagination: p. 9-12
  • Serial:
    • Ultrasonics
    • Volume: 18
    • Issue Number: 1
    • Publisher: Butterworth Scientific Limited

Subject/Index Terms

Filing Info

  • Accession Number: 00311800
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jul 22 1980 12:00AM