JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 32

software

A unique approach to modelling composite materials and structures
Even though a notable rise in the practical use of composite materials can be observed in the automotive industry, the simulation of composite structures still poses a challenge. DIGIMAT offers a unique approach to stand up to this challenge.
DR. JAN SEYFARTH, DR. ROGER ASSAKER E-XSTREAM ENGINEERING

By

final performance of the composite part.

thermal and strain rate dependency, and failure.

The simulation challenge 32

T

jec composites magazine / No66 July - August 2011

he complexity of structural design in the automotive industry is growing. One of the challenges is the need to develop greener vehicles with a minimum CO2 footprint while improving safety, quality and performance. The reduction in CO2 emissions can be achieved via different technologies, in combination with lightweight structures. The optimum use of high-performance composite materials is a key enabler for the design of lightweight vehicles.

Composites in the automotive industry

Composites cover a large variety of materials where a matrix phase is reinforced by one or more inclusion phases such as fibres and/or other fillers. Composites based on thermoplastic or epoxy matrices are commonly combined with short, long or continuous fibres. Depending on the type of material, automotive parts are processed via injection moulding, draping or other technologies. These parameters result in a high level of complexity. The material’s microstructure is directly influenced by the processing conditions. Changes in the microstructure affect the physical properties of the material and thus the

This complexity poses a special challenge to the simulation engineer. Only a good solution to the question of how to best describe these parts in computations can ensure the satisfactory design of automotive parts. Computer-aided engineering (CAE) has been used to reduce the time and cost of vehicle design and manufacturing for many years. However, most CAE processes, tools and even engineering mindset have been optimized for and targeted to anisotropic materials that are homogeneous like steel. There is a lack of description of heterogeneous composite materials on the simulation market. Different kinds of properties need to be tackled for these materials, such as mechanical stiffness,

The composite solution
A predictive solution showing excellent correlation with the experimental response is based on multi-scale modelling techniques taking into account the influence of material’s microstructure on the material and part response. This technology is implemented in the DIGIMAT software. A new type of material model based on micromechanics is offered to simulation engineers. These models are capable of using local microstructure information provided through processing simulation, calculating the correct nonlinear, strain rate and/or temperature-dependent material response and communicating this to the finite element analysis (FEA) solver (see Figure 1).

Fig. 1: Micromechanical material models are sensitive to fibre orientation. Based on injection moulding simulation, this can be used to predict the local stiffness of the part (courtesy of Renault)



Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011

Cover
Edito
Point of view: Products for thermoplastic reinforcement
Contents
Agenda of Events
COMPANY & BUSINESS
- In Brief
- Aeronautics
APPLICATIONS
- Sports and leisure
- Civil engineering
MARKET
- Glass fibre
- Human Resources
- South America
- Sustainability
FEATURE AUTOMOTIVE
- Vessel
- Prepreg
- Software
- Thermoplastic
- Biocomposites
- High Performance
RESEARCH & DEVELOPMENT
- Process
- Environment
TECHNOLOGY & INNOVATIONS
- CNC
- Multiaxial
- Thermoplastic
- Traceability
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Cover
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 2
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Edito
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Point of view: Products for thermoplastic reinforcement
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 5
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Contents
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 7
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Ad1
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Ad2
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - In Brief
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Aeronautics
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 11
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Sports and leisure
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 13
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Civil engineering
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 15
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Glass fibre
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 17
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 18
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Human Resources
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - South America
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 21
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Sustainability
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 23
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 24
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 25
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Vessel
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 27
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 28
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Prepreg
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 30
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 31
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Software
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 33
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Thermoplastic
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 35
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 36
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 37
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 38
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 40
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 41
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 42
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 43
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 44
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 45
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - High Performance
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 47
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Process
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 49
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Environment
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 51
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 52
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - CNC
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 54
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 55
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Multiaxial
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Thermoplastic
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 58
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Traceability
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 60
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Index
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - In the world
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 63
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 64
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