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عنوان فارسی مقاله:
نقشه برداری المان محدود برای شبکه های FE ناسازگار سازه های کامپوزیت
عنوان انگلیسی مقاله:
Finite element mapping for incompatible FE meshes of composite structures
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Finite element analysis (FEA) is a common instrument to design and analysis composite structures. Several engineering simulation packages are available in specific engineering fields for mechanical, thermo-mechanical or fluid dynamics analyses. A multidisciplinary FEA of composite structures is important for a realistic simulation of structural behavior. The multidisciplinary FEA consider a combination of different approaches for process and structural simulation and can use shell, plate, beam or solid element theories. The mesh and element diversity makes it difficult to combine different approaches and to analyse effects of manufacturing effects and defects [1–3]. Several strategies were developed to transfer FE data between shell element meshes [4,5] or between shell and solid element meshes [6]. Approaches for a data transfer between different simulations for fluid dynamics and structural simulations of metal components have been presented [7,8,9,10]. In the analysis of composite structures, process simulations are less integrated into structural simulations.The manufacturing chain of composites includes i.e. preforming, impregnation and curing processes. The manufacturing processes are simulated with several finite element (FE) packages based on shell and solid element meshes, where FE and meshing strategies are depending on the engineering problems. A preforming step can be done with a draping, a braiding or an automated fiber placement (AFP) process. Composite materials do not fit exactly a desired geometry during a draping process and can produce wrinkling material defects [11]. FE based draping simulations can reproduce out-of-plane wrinkling and shear behavior of composite materials. Such simulations use separated meshes per composite ply [12] with material parameters and contact definitions. Results of these simulations are represented on a deformed mesh geometry compared to the designed geometry. Therefore, the draping mesh is incompatible with a structural mesh where a shell element mesh based on the designed geometry is used for all layers. If the source and the target meshes have different FE geometries then the produced mapping errors are more relevant for the next analysis steps. The main challenge here is to map the fiber orientations of the source mesh as vectors into a new reference coordinate system and reproduce manufacturing effects and defects of materials. The different source reference coordinate systems are used in applications such as structural simulationsbased on process data or process simulations based on measuring data [13]. Commercial software packages [14–18] implemented different solutions in this field. A main limitation of these solutions is that these packages transfer fiber orientation values from kinematic draping simulations. Kinematic draping approaches are geometry or energy based and the results are represented on the same FE geometry as a structural FE geometry. A kinematic draping approach is used for a first estimation of a draping behavior. On the other hand, FE- or mechanically based draping simulations are used for more realistic behavior estimations. The existing commercial mapping solutions cannot be extended with other software packages. However, it is important to use a software-independent mapping solution for a multidisciplinary analysis of composite structures to understand a composite material behavior with different simulation approaches.
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کلمات کلیدی:
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