STABILITY, TENACITY AND PROPAGATION OF CRACKS IN STEEL WIRES AND BARS

STABILITE, TENACITE, PROPAGATION DES FISSURES DANS LES FILS ET BARRES EN ACIER

THIS REPORT PRESENTS THE CALCULATION OF THE FAILURE PARAMETERS OF A PLANE DEFECT (TRANSVERSE SURFACE CRACK) FOR A GIVEN STRESS WHEN THE SAMPLE IS SUBJECTED TO TENSILE STRESSES, PURE BENDING STRESSES OR UNIFORM LATERAL LOADING. STEEL IS ASSIMILATED TO AN ELASTIC MEDIUM IN WHICH THE STRESS INTENSITY FACTOR K AND INDEX I VARY ALONG THE FRONT OF THE CRACK. PARAMETERS K, INDEX I AND G (CRACK PROPAGATION FORCE) HAVE BEEN CALCULATED BY MEANS OF A PROGRAM BASED ON THE INTEGRAL EQUATION METHOD. TWO APPROACHES WERE USED UTILIZING - (1) EITHER THE DISPLACEMENT OR (2) THE POTENTIAL ENERGY; THE CONVERGENCE OF THE TWO METHODS WAS VERIFIED. CALCULATIONS WERE MADE OF: (A) THE VARIATION OF K INDEX I ALONG THE FRONT OF THE CRACK AS A FUNCTION OF THE GEOMETRY OF THE LATTER AND THE MOST PROBABLE PROGRESSIVE EVOLUTION OF THE DEFECT; AND (B) THE VARIATION OF THE PROPAGATION OF THE CRACK FORCE AS A FUNCTION OF ITS GEOMETRY. CALCULATION RESULTS WERE VERIFIED EXPERIMENTALLY FOR THE CASE OF TENSILE STRESSES, ON SAMPLES 12 MM IN DIAMETER WITH NOTCHES VARYING IN SHAPE AND DIMENSIONS.

Language

  • French

Media Info

  • Pagination: 81P
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01290015
  • Record Type: Publication
  • Source Agency: Institut Francais des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)
  • Files: ITRD
  • Created Date: Nov 21 2010 2:02AM