LAMPROP(5) Contributed Software Manual LAMPROP(5)NAMElamprop — 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 lay‐
ers (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 fol‐
lowing 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 trans‐
verse 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obtain, they have been replaced by values derived from the matrix,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 fol‐
lowing 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 val‐
ues, 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 ori‐
ented.
[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 ALSOlamprop(1)
Stephen W. Tsai, Theory of composites design, Think Composites, 1992.
A.T. Nettles, Basic Mechanics of Laminated Plates, NASA, 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/
BSD February 24, 2014 BSD
