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  • software for torsional analysis

    The following announcement appeared in the December 1993 issue of the
    ASB newsletter. It briefly describes some software for calculating
    areal and torsional properties of cross sections.

    Marc Levenston

    ************************************************** *****************

    To facilitate more accurate interpretation of whole bone torsion
    tests, we have developed a FORTRAN package (VA-TWIST) to calculate
    areal and torsional properties of an arbitrary bone cross section.
    VA-TWIST solves for the actual torsional properties of the bone
    section, eliminating the need for "equivalent" circular or elliptical
    approximations of the cross section (which can result in errors in
    excess of 40 % for maximum shear stresses). VA-TWIST computes the
    centroidal location (X, Y), area (A), moments and product of inertia
    (Ix, Iy, Ixy, J), principal moments of inertia (I1, I2), torsion
    constant (K) and the distribution of shear stresses throughout the
    cross section.

    VA-TWIST accepts digitized descriptions of the outer (periosteal) and
    inner (endosteal) contours of a cross section, automatically generates
    a finite element mesh, and solves a finite element problem for the
    torsional properties. Alternatively, the user can provide a
    pre-defined mesh for more complicated geometries (e.g., a section with
    several holes). VA-TWIST will run on most workstations, PC
    compatibles or Macintosh computers which have a FORTRAN compiler.

    A copy of the source code and documentation can be obtained by sending
    an electronic mail message to:

    levenston@roses.stanford.edu

    Alternatively, a Macintosh formatted diskette should be sent to:

    Marc E. Levenston
    Rehabilitation Research and Development Center (153)
    Palo Alto VA Medical Center
    3801 Miranda Avenue
    Palo Alto, CA 94304-1200
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