A STUDY OF THE DAMPING CHARACTERISTICS OF HONEYCOMB SANDWICH CONSTRUCTION

Abstract

Damping characteristics of honeycomb sandwich construction are studied experimentally. Tests are made on a series of constant section cantilever beams with aluminum alloy facings and cores. The beams have equal depths, but have a range of core heights varying from 0 (solid beam) to 0.8 of the beam depth. The resonant amplification factor in forced vibration and the logarithmic decrement in free vibration are found for the fundamental mode. A theoretical analysis is performed, based on the hypothesis that the specific energy dissipation varies as some power (the damping exponent) of the maximum cyclic stress. Experimental results show qualitative agreement with predicted effects of core height variation. Amplitude dependence of observed damping indicates that the damping exponent is between two and three. Measured natural frequencies agree well with calculated values.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1962
Accession Number
AD0482374

Entities

People

  • Eugene R. Van Hoof

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Autonomy
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Accelerometers
  • Aluminum
  • Cantilever Beams
  • Frequency
  • Honeycomb Cores
  • Materials
  • Measurement
  • Modulus Of Elasticity
  • Resonance
  • Resonant Frequency
  • Sandwich Construction
  • Shear Modulus
  • Shear Stresses
  • Steady State
  • Strain Gages
  • Test Methods
  • Vibration

Fields of Study

  • Physics

Readers

  • Structural Dynamics.