THE PHOTOELASTIC DETERMINATION OF THE STRESSES IN VIBRATING CANTILEVERED BEAMS

A METHOD OF DETERMINING THE DYNAMIC STRESSES IN VIBRATING CANTILEVERED BEAMS USING PHOTOELASTICITY IS PRESENTED. THE BASIC PRINCIPLES OF PHOTOMECHANICS AND THE OPTIC-STRESS LAWS ARE USED. A HIGH-INTENSITY STROBE LIGHT IS TIMED WITH THE FREQUENCY OF VIBRATION SO THAT THE BEAM IMAGE APPEARS TO BE STATIONARY. DATA ARE RECORDED WITH A CAMERA AND ANALYZED TO PROVIDE AN EXPERIMENTAL SOLUTION. THE THEORETICAL SOLUTION IS DERIVED FROM THE BERNOULLI-EULER EQUATION OF MOTION. TWO BASIC TYPES OF BEAMS WERE INVESTIGATED, AN ALUMINUM BEAM COATED WITH A BIREFRINGENT MATERIAL TO SIMULATE AN ACTUAL STRUCTURAL MEMBER AND A BIREFRINGENT MODEL THAT WAS DYNAMICALLY SIMILAR TO THE ALUMINUM BEAM. THE FEASIBILITY OF EXTENDING THE TECHNIQUE TO MORE COMPLICATED SHAPES IS SUGGESTED. THE EXPERIMENTAL RESULTS AND FEASIBILITY OF THE CONCEPT ARE VERIFIED BY CLOSE CORRELATION WITH THE ANALYTICAL SOLUTION. /AUTHOR/

  • Availability:
  • Supplemental Notes:
    • Vol 11, No 6, PP 284-288
  • Authors:
    • Mathews, C B
    • Cutchins, M A
  • Publication Date: 1971-6

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Filing Info

  • Accession Number: 00209493
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 6 1971 12:00AM