CDS v2.0 - Composite Design and Simulation Software LIMS ...

CCM has been creating unique
design and analysis software solutions
for composite structures for more than
two decades. The software is continuously
upgraded to reflect new research
findings as well as to capitalize on
advances in computing technology.
Software applications such as CDS2.0,
LIMS and MAT162 are used extensively
by researchers at UD-CCM and industrial
sponsors to predict material properties
and behavior during processing and well
as study failure of composites under
dynamic loading.
CDS v2.0 - Composite
Design and Simulation
Software
The newest release of our structural
design tool: CDS2.0 builds upon previous
versions with integrated parametric
design and analysis of composite laminates
and cylinders, material ranking,
drag and drop functionality with standard
spreadsheet import and export. The
software consolidates UD-CCM’s current
composite solid mechanics applications
into a single environment that conducts
effective property predictions,
plate and cylinder analysis
with integrated material
property management, as
well as thermal and process
simulation, all with
real time results.
The materials database
structure has been updated
to allow easy drag-anddrop,
sorting, duplication
and export in multiple formats.
Users can plot sorted
Ashby and tabular data to
easily compare and rank
properties, including
mechanical and physical
properties, micromechanics
parameters, cure
kinetics, and damage and failure properties,
as well as non-linear and MAT162
(LS-DYNA) properties. The user can
modify properties “on the fly” and see
laminate effective properties, stresses,
strains, and progressive failure in real
time. The new parametric design features
allow users to directly compare and
rank properties for multiple micromechanics
or laminate solutions.
CDS2.0 is available to industrial consortium
members through consortium
agreements tailored to program requirements
and duration of contracts.
Demonstration versions of
the CDS suite can be made
available to potential members
with training workshops
at CCM. The software
is PC based and can
run on non-networked PC’s
running Windows® NT, XP
or 7.
To learn more about
CDS2.0, visit
http://www.ccm.udel.
edu/CDS/
LIMS - Liquid Injection
Molding Simulation
Liquid Injection Molding Simulation
(LIMS) is a software tool that simulates
the mold filling stage of liquid composite
molding processes such as resin
transfer molding (RTM), vacuum assisted
resin transfer molding (VARTM) and
related processes by modeling flow
through porous media by the finite element/control
volume method. It provides
a cost-effective way to verify and optimize
mold design by providing a
“virtual” mold filling process to reduce
or eliminate time- and resource-consuming
trial-and-error manufacturing
approaches. In addition, LIMS has been
successfully used to design and simulate
an intelligent or adaptive filling process
that utilizes sensors mounted on the part
and controllable injection hardware,
either as a stand-alone program or as a
simulation engine for other programs.
The simulation allows the user to
monitor flow progression, pressure distribution,
and resin flow rates during the
mold filling process. Various inlet
parameters, including injection and vent
locations, can be changed during the virtual
filling to emulate real injection hardware
limitations and infusion control
algorithms.
© 2010 University of Delaware, All Rights Reserved Find us on the web at https://www.ccm.udel.edu

Center for Composite Materials | 201 Composites Manufacturing Science Lab | University of Delaware | Newark, DE 19716-3144
A number of other effects, such as racetracking--the
tendency for resin to flow
much faster around corners—and placement
of the distribution media in
VARTM type processes can be easily
modeled via a user-friendly graphical
interface called LimsUI. By point and
click, LimsUI allows the user to effortlessly
modify the material and injection
parameters, run simulations, view the
simulation results, create racetracking
channels and distribution media layers,
and change or add injection and vent
locations.
LIMS also has a built-in scripting
which allows the user to tailor the simulation
to address many special issues.
Scripts can access the parameters during
the simulation and modify them as
needed. It is even possible to modify the
material data during the simulation. This
allows the user to simulate complex filling
schemes such as those using adaptive
controls. Finally, for those interested
in utilizing the simulation engine in their
own program--for example, for the purpose
of optimization--there is a slave
version and dynamically linkable library
that can be included in the user program.
Currently, LIMS is supported for the
Windows XP (32- and 64-bit) environment
and later, and the simulation
engine ports for UNIX are also available.
To learn more about LIMS, visit
http://www.ccm.udel.edu/Pubs/techbriefs/LIMS.pdf
MAT162 in LS-DYNA:
Progressive Damage
Modeling of
Composites
In collaboration with Materials
Sciences Corporation, CCM has developed
a progressive composite damage
model (pCDM) for uni-directional (UD)
and plain-weave (PW) fabric composites,
known as MAT162 and implemented
in LS-DYNA. MAT162 is the stateof-the-art
in three-dimensional high
strain rate progressive damage modeling
of UD and PW composites using solid
elements and was developed on the
foundation of earlier the orthotropic
composite models MAT02 and MAT59.
Based on Hashin's theory, five quadratic
failure criteria for UD composites and
seven failure criteria for PW composites
are defined to model different composite
damage modes—for example, matrix
cracking, delamination, fiber tensionshear,
fiber compression, fiber shear, and
composite crush. MAT162 has the capability
of modeling the post-damage softening
behavior of composites as well as
simulating the material degradation that
occurs with various damage modes.
MAT162 requires a series of softening
and rate parameters in addition to
elastic constants and strength properties.
CCM has developed a series of model
experiments to determine these parameters
by conducting a series of parametric
simulations of quasi-static punch shear,
dynamic punch shear, and ballistic experiments.
CCM is now developing pCDM
for 2D and 3D fabric composites of various
weaving architectures. In order to
bridge the gap from micro- to meso- to
macro-mechanics based damage model,
CCM will incorporate different failure
theories in different scales.
MAT162 progressive damage is now
available in explicit FEA code LS-Dyna;
however, the codes are being implemented
in ABAQUS for implicit and structural
analysis.
To learn more about MAT162, visit
http://www.ccm.udel.edu/Tech/
MAT162/Intro.htm
Technical Contacts
John Tierney
CDS
Phone: 302.831.0548
yarlagad@udel.edu
Pavel Simacek
LIMS
Phone: 302.831.6454
psimacek@udel.edu
Bazle Gama
MAT 162
Phone: 302.831.0248
gama@udel.edu
© 2010 University of Delaware, All Rights Reserved Fax: 302.831.8525 Find us on the web at http://www.ccm.udel.edu