J8
Multiscale - Composites

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15:35
conference time (CEST, Berlin)
Modelling of 3D-Woven Composites Performance to Support the Virtual Design Process
26/10/2021 15:35 conference time (CEST, Berlin)
Room: J
V. Kotov (ESI, RUS); P.A. Khilov, A.V. Pakhomenkov, K.R. Pyatunin (PJSC UEC-Saturn, RUS); J. Bartošek, J. Pokorný (ESI MECAS, CZE); D. Huehn, S. Müller (ESI, DEU)
V. Kotov (ESI, RUS); P.A. Khilov, A.V. Pakhomenkov, K.R. Pyatunin (PJSC UEC-Saturn, RUS); J. Bartošek, J. Pokorný (ESI MECAS, CZE); D. Huehn, S. Müller (ESI, DEU)
There is today a massive trend in weight reduction and improvement of performance of individual components in aerospace industry, and it calls for implementation of new sophisticated materials like 3D woven composites. 3D composites offer high mechanical performance for generally loaded structures and its implementation for many heavily loaded parts is logical step to investigate. However, the complex architecture of the reinforcement makes challenging the design and manufacturing process using existing simulation tools. Note also that the traditional trial-and-error approach suffers from an additional drawback resulting from the very large number of different types of local behaviours found in a 3D composite structure. This contribution presents a comprehensive approach to simulate the mechanical performance of a 3D woven composite structure. The presented approach is implemented into dedicated software tool created for automatic assessment of a woven composite design in predefined scenarios: quasi-static tests or impact tests. The developed tool is based on automatized multi-scale approach, which enables to generate homogenized material parameters for structure areas with similar weaving patterns used for the design of a structure. The Multi-scale methodology is based on following approaches: homogenization at the micro-scale level of the roving characteristics; homogenizations at the meso-scale level on representative volume elements of the 3D-composites and final assignation of the various sets of material data to the corresponding sections over the complete composite part. This methodology makes possible to fully account for local variations in the structure stiffness / strength across a 3D woven composite part. Component tests, which were used for validation of the methodology, will be also presented. There were tested samples of various thicknesses and weaving patterns in configuration of tensile test, compression test, shear test and also drop tests with spherical impactor. The tests configurations were respected via prepared FE models and material model was generated via multiscale scale approach. There was also compaction process considered during representative volume segments generation.
3D-Woven composite material; mechanical performance; Multi-scale-modeling; Micro-scale; Meso-scale; Macro-scale; Computer simulation; Fiber volume content
15:55
conference time (CEST, Berlin)
From Nano Modeling to Macro Modeling in the Service of the Functionalization of Composites
26/10/2021 15:55 conference time (CEST, Berlin)
Room: J
P. Dewailly (IPC, FRA)
P. Dewailly (IPC, FRA)
Last years, composite materials for transport is increasingly deployed through their functionalization. The integration of nanofillers in composite materials makes it possible to meet the need for de-icing, self-curing and self sensing. The difficulty is to be able to model physical phenomena which take place at multiple scales. Multi-scale modeling allows a better understanding of phenomena from nano to macro and allows the deployment of these technologies at the scale of industrial parts. As part of the European MASTRO project, IPC is implementing simulations from the nano scale to the micro scale (Abaqus + Digimat) in order to validate the multi-scale approach making it possible to provide the input material data to the macro scale. Electrical modeling at the nano scale presents problems for a finite element solution (electron tunneling effect) and moreover requires a lot of computation time. This is why an analytical code has been developed in parallel in order to obtain the homogenized electrical conductivity values more quickly at the nano scale. This application was developed in python in order to be integrated into a web service. The homogenized data of electrical conductivity, thermal conductivity and mechanical properties allowed the implementation of electro-thermal (Joule effect) and electro-mechanical (piezo resistive effect) modeling. These models have been validated on laboratory scale demonstrators in order to be deployed on industrial demonstrators. The modeling of the Joule effect with slaving of the electric field as a function of temperature has been deployed on an automobile demonstrator in order to validate a system allowing de-icing. In parallel, the modeling of the curing of thermoset composite materials was carried out by coupling an electro-thermo-mechanical model (Abaqus) to a curing model (Digimat) taking into account the variation in mechanical properties according to curing and temperature in order to obtain the distortions of the part resulting from the process.
Multi-scale homogenization, nanofillers, Joule effect, piezoresistivity effect, curing effect, multiphysics simulations
16:15
conference time (CEST, Berlin)
RVE Micromechanical Based Material Property Predication with Randomly Distributed Inclusions
26/10/2021 16:15 conference time (CEST, Berlin)
Room: J
W. He, J. Li, P. Verma (Dassault Systèmes, USA)
W. He, J. Li, P. Verma (Dassault Systèmes, USA)
This paper focuses on a Finite Element (FE) based approach with micromechanical RVE (Representative Volume Element) method for predicting nonlinear material properties for three-dimensional (3D) composite materials with randomly distributed inclusions. Assuming the RVE is uniformly repeated over the domain of an entire structure, the effective constitutive properties of the RVE will characterize the entire domain as well. A 3D RVE generator is developed to facilitate automatically one or multiple types of material inclusions that are randomly distributed inside the RVE. The RVE geometry are symmetric on each pair of two opposite boundary faces - totally 3 pairs of a cubic RVE. To achieve fast virtual tests, an automatic meshing method is developed and employed to generate a complete periodically symmetric mesh for the RVE to serve a rigorous homogenization compute process for various configurations of the RVE with different inclusion distributions. This procedure can easily apply to RVEs with different randomly distributions of inclusions to generate meshes. Analysis procedures are defined with respect to loading cases based on far-field solution to obtain local solution fields from finite element analysis. Different cases of the interfaces between inclusions and matrix are investigated in this study: perfectly bonded and debonded using interfacial damage initiation and evolution with cohesive behaviors. In the computational study, a new Abaqus iterative solving technology is used to solve the large models with high performance than direct solving algorithm. Using a rubber material as an industrial application of this developed solution, the calibrated nonlinear material properties from RVE virtual test results are applied in a steady-state rolling analysis of a tire traveling at a ground velocity of 10.0 km/hr on a flat rigid road surface. The results of rubber material with hard inclusions predict differences in the free rolling equilibrium solutions and the contact pressure distribution between the tire and the road comparing with the results without inclusions.
RVE generator, Random inclusion distribution, automatic periodically symmetric mesh, iterative solving, nonlinear material property Modsim
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