DISCUSSION ON PLANE STRAIN CONSOLIDATION BY FINITE ELEMENTS

THIS DISCUSSION IS CONCERNED WITH TWO ASPECTS OF THE PAPER: (1) THE FINITE ELEMENT SOLUTION TECHNIQUE USED AND (2) THE EFFECT OF A NONUNIFORM FINITE ELEMENT MESH. THE FINITE ELEMENT METHOD OF ANALYSIS PRESENTED BY THE AUTHORS USES A FINITE ELEMENT METHOD FOR THE EFFECTIVE STRESS-STRAIN AND PORE PRESSURE ANALYSIS. THESE PORE PRESSURES ARE THEN USED TO ESTIMATE THE VOLUME CHANGE OR FLOW. HOWEVER, THE EFFECTIVE STRESS-STRAIN AND FLOW PROBLEMS ARE COUPLED AND A RIGOROUS FINITE ELEMENT SOLUTION REQUIRES THIS COUPLING TO BE TAKEN INTO ACCOUNT. SANDHU AND WILSON HAVE OBTAINED A FINITE ELEMENT SOLUTION IN THE COUPLED FORM. THE CONSOLIDATION PROBLEM IS SIMILAR TO THE TRANSIENT HEAT FLOW PROBLEM IN SOLID MECHANICS. THE TRANSIENT HEAT FLOW PROBLEM IS A COUPLED STRESS AND TEMPERATURE PROBLEM AND CHARLWOOD HAS APPLIED THE FINITE ELEMENT METHOD TO SOLVE THIS PROBLEM IN THE COUPLED FORM FOR BOTH ELASTIC AND ELASTIC-PLASTIC CONSTITUTIVE RELATIONS. HOWEVER, THE AUTHORS TECHNIQUE IS VERY SIMPLE AND APPEARS TO GIVE GENERALLY GOOD AGREEMENT WITH CLOSED FORM SOLUTIONS. REGARDING THE INFLUENCE OF A NONUNIFORM FINITE ELEMENT MESH, THE WRITERS HAVE FOUND THAT SIGNIFICANT ERRORS CAN ARISE IN ESTIMATING THE INITIAL EXCESS WHERE THE MESH IS UNIFORM, THE AUTHORS SHOW CLOSE AGREEMENT WITH CLOSED FORM SOLUTION. HOWEVER, IN FIGURE 11 WHERE THE ELEMENT SIZE AND SHAPE CHANGES THROUGHOUT THE REGION, THE RESULTS OBTAINED DIFFER SOMEWHAT FROM THE CLOSED FORM SOLUTION. THE WRITERS WOULD LIKE TO SUGGEST THAT THE MAIN REASON FOR THIS DISCREPANCY IS THE MESH USED. /AUTHOR/

  • Supplemental Notes:
    • Vol 97, No SM 5, PROC PAPER 8083, PP 808-809, 1 FIG, 3 REF
  • Authors:
    • Finn, W D
    • Byrne, P M
  • Discussers:
    • BUCHER, F
  • Publication Date: 1971-5

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Filing Info

  • Accession Number: 00236032
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 8 1971 12:00AM