Flaw identification from forced vibration testing

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5792902

Rogers, J. D.; Hollingshead, J. R.

A continuous system approach to the vibration characteristics of a symmetrically slotted beam has been developed. The beam was modelled as a Bernoulli-Euler beam with a reasonable stress distribution associated with the slots. The equation of motion was developd and resonant frequencies obtained from Rayleigh's Quotient. An experimental study of an aluminum beam with symmetrical slots was performed. The resonant frequency and apparent mass (a measure of damping) were measured. Reasonably good correlation in natural frequencies between theory and experiment was obtained. The reduction in natural frequency was a more sensitive indicator of damage than was the increase in damping. 7 refs., 7 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5792902
• Report Number(s): SAND-87-1360C; CONF-880220-7; ON: DE88002641
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420500* -- Engineering-- Materials Testing
ALUMINIUM
DEFECTS
DIFFERENTIAL EQUATIONS
EIGENVALUES
ELEMENTS
ENERGY
EQUATIONS
EQUATIONS OF MOTION
KINETIC ENERGY
MECHANICAL VIBRATIONS
METALS
PARTIAL DIFFERENTIAL EQUATIONS
POTENTIAL ENERGY
STRESS ANALYSIS
STRUCTURAL BEAMS
TESTING