COMPOSITES

Our Mission:
The composite industry faces challenging questions:
➢ Does the new composite material improve my component?
➢ Does it combine sufficient stiffness with low weight?
➢ Do I understand the microscopic behavior of the composite for my component simulation?

GeoDict, the digital material laboratory, provides answers to such questions. It helps to avoid trial-and-error and to prototype only the most promising composites.

GeoDict’s material-CAE bridges the gap between process-CAE and structure-CAE. Compute composite material properties, e.g. for component simulations, on detailed 3D material models or μCT scans.

GeoDict’s accurate and quick computations run on standard hardware. Here, we analyze the material properties of an engine bearer. The component’s composite is PA 66 GF50 (polyamide, 50% glass-fibers).

composites

composites-m2m

▪ Workflow:
Structure import
The μCT scan is segmented into glass fibers and polyamide matrix using the image processing module ImportGeo. The fibers’ solid volume percentage is 30% (weight percentage 50%).

importgeo

Fiber structure analysis
The fiber structure of the composite is analyzed with FiberGuess: Fiber diameter: 8.56 +/- 1.9 μm

fiber-structure

Thermal conductivity analysis

Thermal conductivity of the composite is calculated with ConductoDict assuming conductivities 0.76 W/(mK) for glass and 0.33 W/(mK) for polyamide.

thermal-conductivity-analysis

Effective linear elastic properties

Effective linear elastic properties of the composite are simulated with ElastoDict, assuming Young’s modulus E = 86.9 GPa and Poisson ratio ? = 0.2 for the fibers (S2-Glass), and E = 3 GPa and v = 0.15 for the polyamide matrix. The Young’s modulus of the composite, parallel and perpendicular to the fibers is shown in Figure below.

effective-linear-elastic-properties

Thermal expansion tensor

Thermal expansion tensor of the composite is computed with ElastoDict, assuming 5e-06 1/K as linear thermal expansion coefficient of glass and 8e-05 1/K for polyamide.

Tensile experiment

A tensile experiment up to 5% strain in different loading directions is simulated. Consider matrix damage, modeled by an Abaqus UMAT in ElastoDict. Fiber breakage is not considered. The resulting strain-stress curves are shown in Figure below.

tensile-test-in-different-load-directions

Composite Design

Design of the composite is done with FiberGeo. Input parameters are fiber weight percentage, fiber diameter distribution, and fiber orientation. Models with different solid volume percentages are created and the influence of density variations on the elastic properties is studied.