Influence of the Foam Morphology on the Mechanical Behavior of Flow‐Through Foam Filters During Filtration Processes

Abstract

Artificial foam structures are used in all kinds of applications, for example, in filters, where non‐metallic inclusions are filtered out of the molten metal. The flow‐through of the fluid leads to a mechanical loading, which is influenced by the flow velocity, the viscosity of the fluid, the foam morphology, and the shape of the filter. Analytical and numerical approaches are being used to study the influence of different parameters on the mechanical response and the impact on local stresses at the foam struts. Finite element models of the foams are used to evaluate the homogenized stiffness tensor and to determine maximal local stresses in dependence of the macroscopic strain. On the macroscopic filter scale, an orthotropic Mindlin plate model is deployed. The results are compared with a FE2‐simulation.

Fracture‐Resistant and Thermally Insulating Ultrahigh‐Temperature Carbide Foams

“…The macropore size and distribution largely govern the material's mechanical behavior and thermal conduction. Lange et al [ 39 ] studied the influence of foam morphology on the mechanical behavior via finite‐element models. Hence, the distribution of the macropores has been reported by taking measurements of the Feret's diameter for each particle using ImageJ.…”

Efficient monolithic solution of FE2 problems

“…The flow through melt acts like a volume force from a mechanical viewpoint. Details can be found in [26]. On the macro scale an axis symmetric model with linear, fully integrated Abaqus elements CAX4 at large deformations are used, whereby the contact between filter and coating is described by Coulomb friction with µ = 0.3.…”

“…The RVE and its mesh is taken from [26] (parameters: k = 0.75, ϱ rel = 0.20). The material behavior is represented through a hypo elastic creep model in strain hardening form.…”

Computer‐Aided Design of Metal Melt Filters: Geometric Modifications of Open‐Cell Foams, Effective Hydraulic Properties and Filtration Performance

“…related to the probability of the contact to the strut walls. The permeability and the Forchheimer coefficients, on the contrary, characterize the pressure drop behavior, which plays an important role in determining the mechanical stability of the filters [14] and may affect the achievable casting rates or the operation costs for a given filtration process. Furthermore, the filtration performance is assessed by evaluating the filtration coefficient for the initial stage.…”