THE DYNAMICS OF A BUCKLING PROCESS

DYNAMIK EINES KNICKVORGANGES

THE EFFECTS OF REACTION FORCES ARISING BECAUSE OF THE ACCELERATED LATERAL EVASIVE MOVEMENTS OF STRUCTURAL PARTS, GIVE RISE TO CHARACTERISTIC DIFFERENCES IN THE FORCE-DEFORMATION CURVE IN THE QUASI-STATIC AND DYNAMIC DEFORMATION OF THE CAR BODY. THEORETICAL AND EXPERIMENTAL STUDIES SHOW THAT IN THE CASE OF THE BUCKLING OF A STRUT, THESE FORCES CAN BE UP TO 10% HIGHER THAN THOSE WHICH COULD BE EXPECTED FROM THE "EULER" BUCKLING LOADS (BECAUSE OF A TOGGLE EFFECT). MODELLING OF THE MATERIAL BEHAVIOUR AS WELL AS THE HYPOTHESES, BOTH THAT THE BUCKLING FORM WILL TAKE THE SHAPE WHICH WILL GIVE THE SMALLEST ENERGY OF DEFORMATION, AND THAT THE INITIAL DISTURBANCES (IN THE FORM OF AN INITIAL DEFORMATION OF THE STRUT), ARE PROPORTIONAL TO THE WAVE LENGTHS OF THE BUCKLING SHAPE, HAVE BEEN SHOWN TO BE REASONABLE AND RELIABLE AND ARE SUPPORTED BY EXPERIMENTAL STUDIES. THE INFLUENCES OF THE DEFORMATION VELOCITY AND THE MAGNITUDES OF THE INITIAL DEFORMATION ARE DEMONSTRATED. THE RITZ-GALERKIAN METHOD IS AN AID IN THE THEORETICAL ANALYSIS, AS ARE HIGH SPEED FILMS AND A FORCE MEASUREMENT DEVICE IN EXPERIMENTAL STUDIES. WHERE THE STRUT DOES NOT BUCKLE LOCALLY, EQUIVALENT STRUT LENGTHS CAN BE CALCULATED FROM THE CHARACTERISTIC VALUES OF THE MATERIALS AND FROM THE CROSS SECTIONAL DATA.

Language

  • German

Media Info

  • Pagination: 49-56
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01300316
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD
  • Created Date: Nov 21 2010 7:47AM