Calculation of the phase velocity of Lamb waves in plate composite structures
Project description
Displam
Displam is a legacy Fortran-based program for the calculation of the phase velocity of Lamb waves of plate composite structures.
Installation from source requires an active open source fortran compiler (gfortran). Intel Fortran is not yet supported.
Downloading
Use GIT to get the latest code base. From the command line, use
git clone https://gitlab.dlr.de/fa_sw/displam displam
If you check out the repository for the first time, you have to initialize all submodule dependencies first. Execute the following from within the repository.
git submodule update --init --recursive
To update all refererenced submodules to the latest production level, use
git submodule foreach --recursive 'git pull origin $(git config -f $toplevel/.gitmodules submodule.$name.branch || echo master)'
Installation
Displam can be installed directly using pip
pip install displam
or from source using poetry. If you don't have poetry installed, run
pip install poetry --pre --upgrade
to install the latest version of poetry within your python environment. Use
poetry update
to update all dependencies in the lock file or directly execute
poetry install
to install all dependencies from the lock file. Last, you should be able to use Displam as a CLI tool:
displam <Input file>
If you omit the input file name displam will try to read the input data from a file named sample.inp. An output file disp.txt and a log file log.txt will be created.
Output
The output file contains the dispersion data for the problem defined in the input file. A header line is followed by one record per line. Each record consists of the following data:
1. fd/(MHz*mm) - frequency * plate thickness
2. cp/(km/sec) - phase velocity
3. w/(1/�sec) - circular frequency
4. k/(1/m) - wave number
5. mode - wave mode ('S' for symmetric, 'A' for antisymmetric
and 'H' for quasi-horizontal shear mode)
6. uu0 - uu2 - complex displacement vector at the upper surface of
the laminate
7. ul0 - ul2 - complex displacement vector at the lower surface of
the laminate
The columns are seperated by tab-characters. You can open the output file with Excel or any text editor.
Example
Copy and paste the following text up to the end of this file to a new text file to use it as a sample input file as explained under Installation
#
# Input file for displam
#
############################################################### File format ###
#
# Input is parsed line by line. Everything after a '#' character is ignored,
# so it's possible to append comments to input lines. Empty lines are
# ignored. White space separates keywords and input parameters and may be
# entered as spaces or tabs. Lines may not be longer than 1000 characters
# (excluding comments).
#
# The following four sections must be present in this file. Each section is
# initiated with its keyword in capital letters in an otherwise empty line.
#
# LAYUP - stacking sequence of the plate
# WAVE - wave propagation parameters
# RANGE - parameter ranges for circular frequency and phase velocity
# MATERIAL - material database
#
# The format of the input lines in each section is explained in the comments
# above each section.
############################################################# LAYUP section ###
#
# The layers of the stacking sequence are specified from top to bottom
# of the laminate. Three parameters must be specified per line:
#
# 1. material id string as specified in the MATERIAL section
# 2. layer thickness in mm
# 3. layer orientation in degrees
#
# A layer orientation of 0 degree means that the 1-direction of local (layer
# material) and global (laminate) direction coincide.
#
LAYUP
cfrp_generic 0.250 0.
titanium 0.500 90.
cfrp_generic 0.250 0.
############################################################## WAVE section ###
#
# pa - angle of wave propagation w.r.t. global coordinates in degrees.
# ia - angle of incident wave w.r.t. transverse axis in degrees.
# 90.0 is horizontal (in-plane) incident wave.
WAVE
pa 0.01
ia 90.00 # values other than 90� are not validated yet
############################################################# RANGE section ###
#
# cp - 3 values for start, end, and number of increments for phase velocity.
# Unit of phase velocity is in km / s.
# fq - 3 values for start, end, and number of increments for frequency.
# Unit of frequencies must be MHz.
RANGE
cp 0.1 14.0 200 # unit is km/s
fq 0.1 3.0 200 # unit is MHz
########################################################## MATERIAL section ###
#
# Each line starts with an identification string of up to 12 alphanumeric
# characters and '_'. It is followed by the number of independent stiffness
# constants (nsc) and the density in g / cm^3.
#
# Transversely isotropic (nsc = 5) and orthotropic (nsc = 9) materials are
# supported. After the density the stiffness parameters must be specified
# in GPa for Young's and shear moduli in the following order
#
# transversely isotropic E1, E2, G12, G23, nu12
# orthotropic E1, E2, E3, G12, G23, G31, nu12, nu23, nu31
#
# The 3-direction is the out-of-plane direction.
#
MATERIAL
# 123456789012 nsc rho stiffness coefficients
alu 5 2.70 69.9 70.1 26.30 26.20 0.33
titanium 5 4.50 115.9 116.1 43.95 43.85 0.32
cfrp_generic 5 1.55 150.0 9.00 5.00 4.00 0.30
cfrp_rose 5 1.58 123.9 11.256 6.73 3.81 0.31
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