EXPERIMENTAL DETERMINATION OF RESIDUAL STRESSES IN AN ORTHOTROPIC MATERIAL

A SIMPLE, ACCURATE, COMPUTERIZED TECHNIQUE HAS BEEN DEVELOPED AND EXPERIMENTALLY VERIFIED TO COMPUTE, TABULATE, AND PREPARE A GRAPHICAL DISPLAY OF THE RESIDUAL STRESS DISTRIBUTION IN TWO ORTHOGONAL DIRECTIONS OF AN ISOTROPIC OR ORTHOTROPIC STRUCTURE. THE EQUATIONS TAKE INTO ACCOUNT DIFFERENT VALUES OF YOUNG'S MODULUS AND POISSON'S RATIO IN THE TWO ORTHOGONAL DIRECTIONS OF THE MATERIAL. PROVISIONS FOR THE INCLUSION OF THESE PROPERTIES HAVE NOT BEEN FOUND IN A SURVEY OF THE LITERATURE PUBLISHED TO DATE. STRAIN GAGE MEASUREMENTS ARE MADE ON THE TWO OPPOSITE SURFACES OF AN ELEMENT BEFORE AND AFTER BEING CUT FROM THE STRUCTURE, AND LINEAR STRESSES ARE COMPUTED FROM THE VALUES OF THE RELEASED STRAINS. THE NON-LINEAR RESIDUAL STRESS DISTRIBUTION ACROSS THE ELEMENT IS DETERMINED BY REMOVING LAYERS OF MATERIAL FROM ONE SIDE. THICKNESS AND STRAIN READINGS ARE TAKEN BEFORE AND AFTER REMOVAL OF EACH LAYER. THESE DATA PLUS POISSON'S RATIOS AND THE ELASTIC MODULI IN TWO ORTHOGONAL DIRECTIONS BECOME THE INPUT TO A FORTRAN IV PROGRAM WHICH COMPUTES, TABULATES, AND PREPARES A GRAPHICAL DISPLAY OF THE LINEAR, NONLINEAR, AND TOTAL RESIDUAL STRESSES. EXPERIMENTAL RESULTS SHOW THAT THE MINIMUM LENGTH AND WIDTH OF THE SPECIMEN MUST BE APPROXIMATELY TWO TIMES ITS THICKNESS TO LEAVE THE NONLINEAR RESIDUAL STRESSES IN THE SPECIMEN ESSENTIALLY UNDISTURBED. A LITERATURE SURVEY OF THE VARIOUS TECHNIQUES WHICH HAVE BEEN USED IN THE PAST TO DETERMINE RESIDUAL STRESSES IS INCLUDED WITH COMMENTS AS TO THEIR ADVANTAGES AND DISADVANTAGES. /JM/

• Supplemental Notes:
  • Vol 2, No 4, PP 719-748, 16 FIG, 2 TAB, 30 REF
• Authors:
  • Frick, R E
  • Gurtman, G A
  • Meriwether, H D
• Publication Date: 1967-12

Media Info

• Serial:
  • Journal of Materials
  • Publisher: American Society for Testing and Materials (ASTM)

Subject/Index Terms

• TRT Terms: Computers; Deformation curve; Equations; Graphics; Materials; Modulus of elasticity; Orthogonality; Orthotropic; Pavement layers; Poisson ratio; Residual stress; Strain gages; Strain measurement; Thickness
• Uncontrolled Terms: Graphical analysis
• Old TRIS Terms: Poissons ratio
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216656
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 9 1994 12:00AM