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Man Pages


Manual Reference Pages  -  LAMPROP (5)

NAME

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

CONTENTS

Description
Examples
See Also
Author
License

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 Since these values are very hard to obtain, they have been replaced by values derived from the matrix, according to Tsai(1992).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:

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

SEE ALSO

lamprop(1)
.Rs
.Re
.Rs
.Re

AUTHOR

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

The latest version of this program is available at:
.Lk 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
.Lk http://creativecommons.org/publicdomain/zero/1.0/
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