Accession Number:

ADA125714

Title:

Diagnosis of Fracture Damage in Simple Structures: A Modal Method.

Descriptive Note:

Technical rept.,

Corporate Author:

NEW MEXICO UNIV ALBUQUERQUE BUREAU OF ENGINEERING RESEARCH

Report Date:

1982-10-01

Pagination or Media Count:

58.0

Abstract:

The present paper explores a method to locate fracture damage in a structure, and to estimate the intensity of the damage. It is noted that when fracture damage occurs in a structure, the modal frequencies of the damaged structure will shift. The perturbations in individual modal frequencies are governed uniquely by the intensity of the damage and its location in the structure. Consequently, when the frequency spectrum of an unflawed structure is available, field measurement of the structural response after a major event could lead to an estimate of intensity and location of its damage. The existence of a crack renders an overall softening effect in the compliance of the structure. The reduction in stiffness can be quantified by the location and the intensity of the crack. With such a model, the diagnosis of the fracture damage is fundamentally a structural identification.

Subject Categories:

  • Theoretical Mathematics
  • Civil Engineering
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE