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LAMPROP(5)            DragonFly File Formats Manual (con)           LAMPROP(5)


NAME

     lamprop - This manpage documents the file format used by `$Revision:
     1.5.0 $' of the lamprop program.


DESCRIPTION

     The file format is very simple. Functional lines have either 'f', 'r',
     't', 'm' or 'l' as the first non-whitespace character. This character
     must immediately be followed by a colon ':'. All other lines are seen as
     comments and disregarded.

     This program assumes specific metric units. The units used below are
     important because the program internally calculates the thickness of
     layers (in mm) based on the volume fractions and densities of the fibers
     and resins.

     The 'f:' line contains a definition of a fiber. It must contain the
     following values, separated by whitespace:
     E1      Young's modulus in the fiber direction in MPa.
     v12     Poisson's constant (dimensionless).
     alpha1  Coefficient of Thermal Expansion in the fiber direction in 1/K.
     rho     Density of the fiber in g/cm3.
     name    Name that identifies the fiber. Every fiber in the input files
             should have a unique name.
     Usually, E1 and other properties in the fibre length direction are easily
     obtained from a fiber supplier. Previous versions of this program also
     required some properties perpendicular to the fiber to calculate
     transverse properties of the lamina. Since these values are very hard to
     obtain, they have been replaced by values derived from the matrix,
     according to Tsai(1992).

     The 'r:' line contains a definition of a resin. It must contain the
     following values, separated by whitespace:
     E      Young's modulus of the resin in MPa.
     v      Poisson's constant (dimensionless).
     alpha  CTE of the resin in 1/K.
     rho    Density of the resin in g/cm3.
     name   Name that identifies the resin. Every resin in the input files
            should have a unique name.

     The 't:' line starts a new laminate. It only contains the name which
     identifies the laminate. This name must be unique within the current
     input files.

     The 'm:' line chooses a resin for the laminate. It must appear after a
     't:' line, and before the 'l:' lines. It must contain the following
     values, separated by whitespace:
     vf    The fiber volume fraction for the laminate. This should be a number
           between 0 and 1.
     name  The name of the resin used in the laminate. This resin must have
           been declared previously with an 'r:' line.

     The 'l:' line defines a single layer (lamina) in the laminate. It must be
     preceded by a 't:' and a 'm:' line. It must contain the following values,
     separated by whitespace (optional items in square brackets):
     weight  The weight in g/m2 of the dry fibers.
     angle   The angle upwards from the x-axis under which the fibers are
             oriented.
     [Vf]    Optionally the layer can have a different fiber volume fraction.
     name    The name of the fiber used in this layer. This fiber must have
             been declared previously with an 'f:' line.


EXAMPLES

     The following is a sample input file for lamprop.

           Fiber definition
              E1     v12  alpha1   rho  naam
           f: 233000 0.2  -0.54e-6 1.76 Hyer's carbon fiber

           Matrix definition
              Em   v    alpha   rho name
           r: 4620 0.36 41.4e-6 1.1  Hyer's resin

           t: [0/90]s laminate
           This is a standard symmetric cross-ply laminate. It has fine extensional
           moduli in the fiber directions, but a very low shear modulus.
           m: 0.5 Hyer's resin
           l: 100  0 Hyer's carbon fiber
           l: 100 90 Hyer's carbon fiber
           l: 100 90 Hyer's carbon fiber
           l: 100  0 Hyer's carbon fiber

     Below are some typical values used by the author for different kinds of
     materials:
                 E1     v12     alpha1    rho    name
               124000   0.30    -2e-6     1.44   HM_aramid
               233000   0.20   -0.38e-6   1.80   T700SC (HS carbon)
               238000   0.20   -0.1e-6    1.77   STS5631 (HS carbon)
               238000   0.20   -0.1e-6    1.77   UTS5631 (HS carbon)
               640000   0.23   -1.1e-6    2.12   K63712 (UHM carbon)
                72400   0.33     5e-6     2.54   e_glass

     If anyone would be able to contribute additional material data, the
     author would be grateful.


SEE ALSO

     lamprop(1)

     Stephen W. Tsai, Theory of composites design, Think Composites, Dayton,
     USA, 1992.

     A.T. Nettles, Basic Mechanics of Laminated Plates, NASA, USA, 1994.


AUTHOR

     This manual and the lamprop software were written by Roland Smith
     <rsmith@xs4all.nl>.

     The latest version of this program is available at:
     http://rsmith.home.xs4all.nl/software/


LICENSE

     To the extent possible under law, Roland Smith has waived all copyright
     and related or neighboring rights to this manual. This work is published
     from the Netherlands. See
     http://creativecommons.org/publicdomain/zero/1.0/

DragonFly 6.5-DEVELOPMENT      February 24, 2014     DragonFly 6.5-DEVELOPMENT

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