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Simulation taking into consideration local fiber orientation provides even more accurate results

News International-French

11 Apr 2012

The "integrative simulation" takes fiber orientation in part design into account. Optimum design is of major significance for components that are subject to high loads. During the filling process, fibers in the melt are oriented locally; a fact that has considerable effects on local material properties.

The local degrees of orientation and fiber directions that arise are however often not taken into consideration in common calculation methods. Ticona applies the integrative simulation, e.g. in the design of glass fiber reinforced sunroof mounts.


With the integrative simulation, Ticona is using a calculation method to ensure that glass fiber reinforced components are designed more effectively than with quasi-isotropic linear material models for structural analysis. The field of application for fiber-reinforced thermoplastic polymers is constantly increasing, in particular in parts exposed to high loads. Cost and time factors are issues that have played a significant role in increasing the relevance of computer-aided engineering (CAE) in part design in the past years. Standard procedures, based on the finite-element method are frequently used. These numeric methods provide information on the components' behavior under load. But the influence of the fiber orientation of reinforced thermoplastics is considerable and not taken into account in common methods, a factor which plays a significant role for components subject to high or extreme loads. During the mold filling phase of the injection molding process the fibers are oriented differently in the melt and influence the properties of the subsequent molded part.


Consideration of flow orientation
Unlike standard FE calculation methods, the integrative simulation approach takes the influence of the local fiber orientation in the component as well as the elastic-plastic behavior of the matrix materials. Anisotropic material models are used for this method. These models are based on stress/strain curves that are determined on specimens of the specified material in the main orientation direction of the glass fibers, at a 45° angle and perpendicular to the main direction. The results for the fiber directions are transferred after the mold filling simulation via so-called "mapping" to the structural analysis illustrates that the integrative simulation provides more accurate results than common linear isotropic calculations methods.


Integrative simulation - an efficient method
The integrative simulation is an effective procedure for the optimal design of fiber-reinforced component development. The method is particularly suitable for short-fiber reinforced materials and offers major advantages in material savings and cost in complex parts. With the application of the "integrative simulation” Ticona displays consulting competence in the design of components and underscores its position as a provider of overall solutions in the field of material, component design and processing.


About Ticona and Celanese
Ticona, the engineering polymers business of Celanese Corporation, produces and markets a broad range of high performance products, and posted net sales of $1,298 million in fiscal 2011. Ticona employs more than 1,700 individuals at production, compounding and research facilities in the USA, Germany, Brazil and China.



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