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them to reduce errors and automate design for maximum productivity. The appliance of these templates and
KBE features is supported by an assistant software system which manages the template catalogues und guides
the user through the design process. Hence, CADSTRUCTURAS offers design templates with embedded knowledge,
which encapsulate geometry and design know-how for maximum re-use of high lift device elements. After
that, the assistant software creates interactively intelligent features, parts and assemblies in order to ensure
design compliance with established standards by capturing, managing and sharing corporate knowledge in
rule bases and leverage it across the enterprise.
KBE and CAD result in automated goal driven designs. It accelerates more design alternatives, exploration and
optimization of high lift devices and its structure elements for better design in less time through the interactive
capture of optimization intent, such as cost, weight and material. In addition KBE and CAD ensure design consistency
and quality with rule-based design validation according to standards and best practices. At the end,
the benefits for Airbus using CADSTRUSTURAS besides using CADAERAS for aero design (CAD Aero Assistant)
and CADKINAS for kinematic design (CAD Kinematic Assistant) are reduced costs, higher quality and shorter
design cycle time.
Title: State of the art of composites material simulation
Authors: Dr A. Mete
MSC Software GmbH
Time: November 3, 2009 5:40 pm
Room: Candela
Study of Progressive damage, Fracture, Delamination of composite structures and a methodology to share Native
Geometry and LayUp data between CAD and CAE will be described. The objective of this paper is to show
the advanced composite FEM simulation capability based on innovative tools available with the MSC Software
technology. SimXpert the fully integrated multidiscipline simulation environment is able to manage the Simulation
Process of the advanced composite analysis technologies. Two progressive failure analysis available in MD
Nastran, the MSC‘s multidiscipline solver (MD), to ensure the highest levels of accuracy on composite structures.
Predict the failure of laminated composite structures during critical damage events from local damage such
as matrix cracks, fiber breakage, fibermatrix debonds, and delaminations under normal operating conditions
which may contribute to their failure. The ability to predict the initiation and growth of such damage is essential
for predicting the performance of composite structures and developing reliable, safe designs which exploit the
advantages offered by composite materials. With this approach is possible to ‘track’ the failure modes in detail
for every load step till the final failure of the composite structures.
MD Nastran Composite Simulation Methods includes:
• PFA (Progressive Failure Analysis): Progressive failure analysis predicts the damage initiation, growth,
and final failure of 2D and 3D composite laminated. Available for ‘classic’ failure criteria like Hill, Tsai-Wu
Hoffman and for new available failure criteria like Puck and Hashin, Hashin-tape, Hashin-fabric as well.
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• Adv. PFA (Progressive Failure Analysis): Micromechanical’s material library, evaluation and damage
evolution is fully integrated in MD Nastran. Based on Micromechanical properties (Fiber and Matrix) MD
Nastran and the available Micromechanical Failure Criteria evaluate the structural and material response
including degradation of material properties due to initiation and growth of damage. Is possible analyze
not only traditional 2-D tape and fabric laminate layups, but also 3-D weaves and braids. Over 20 Micro
Mechanical Failure Criteria available with MD Nastran Adv. PFA analysis including failure mechanisms in
honeycomb composite structures such as Wrinkling, Crimping and Dimpling.
• Cohesive Element: The cohesive element formulation, available in MD Nastran, can be used to simulate
delamination phenomena. It is an energetic method that determines delamination initiation and
propagation. Used by special interface elements with different cohesive material models based on
different energy laws depending from the matrix characteristics. Available for 2D and 3D FEM model.
• VCCT (Virtual Crack Closure Techniques): The VCCT is the fracture mechanics approach for studying
delamination and crack initiation and growth. Available in MD Nastran it is used for calculating the
energy release rate of single or multiple cracks. The results will be obtained for each crack separately.
Each crack consists of a crack tip grid for shells and a crack front for solids.
• Breaking glued contact: A powerful tool to evaluate delamination based on a stress criteria. Release
　
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