GAMM2025

Session

S06.2: Material modelling with non-metals

S06.2

10 Apr 2025, 08:30

Lecture and Conference Centre

Conveners

S06.2: Material modelling with non-metals: S06.2.01

• Vu Ngoc Khiêm

S06.2: Material modelling with non-metals: S06.2.02

• Daniel Juhre
• Vu Ngoc Khiêm

S06.2: Material modelling with non-metals: S06.2.03

• Daniel Juhre
• Dominik K. Klein

S06.2: Material modelling with non-metals: S06.2.04

• Vu Ngoc Khiêm
• Daniel Juhre

Description

The section focuses on constitutive modelling of natural and artificial materials subject to elastic and inelastic deformation processes. The aim is to compare new constitutive models formulated on both the phenomenological and the micromechanics basis to determine their validity by comparison of simulations with experiments. A wide range of open problems will be considered in the section, like multi-scale modelling of heterogeneous materials, implementation of constitutive models in numerical applications, and the virtual testing of structural systems.

155. Exploring the effects of thermal aging on filled and unfilled natural rubber compounds with a perspective of SIC modelling

Ondrej Farkas

10/04/2025, 08:30

Elastomers are renowned for their ability to undergo significant deformations and recover their original shape when the acting forces are removed. However, prolonged exposure of this type of polymer to heat, UV light or chemicals can alter the original elastic material structure and therefore be the reason for a pronounced decrease of material performance. Given the importance of lifetime...

156. Data-driven modeling of strain-induced crystallization based on physics-augmented neural networks

Konrad Friedrichs

10/04/2025, 08:50

The mechanical behavior of elastomers, such as natural rubber, is significantly influenced by intrinsic reinforcement effects occurring at large strains, namely strain-induced crystallization (SIC). The outstanding fracture resistance of the material is essentially attributed to the presence of this effect, which makes it interesting for a wide variety of applications. Common constitutive...

157. Efficiency enhancement strategies on the concept of representative directions applied to the dynamic flocculation model for filled elastomers

Mascha Niemeyer

10/04/2025, 09:10

Damping elements made of elastomers are often used in dynamic systems such as vehicles or centrifuges. Numerical simulation methods in general and multi-body simulation (MBS) in particular are applied to predict loads and kinematic quantities in these technical systems. This requires knowledge of mass, damping and stiffness properties. Therefore, the modeling of elastomer components is...

159. Comparative Analysis of Homogenization Techniques for Interphase Modeling in Elastomer Blends

Marc Ulrich

10/04/2025, 09:30

This study focuses on a detailed investigation of the material behavior of rubber blends composed of natural rubber (NR) and styrene-butadiene rubber (SBR) within the frequency domain. The goal is to analyze the specific properties of these blends to understand the significance of the phase transition between the individual phases of the two components. Due to the immiscibility of the two...

158. The Self-Heating of Rubber Elements in Vibration Absorber Systems

Esmat Niksirat

10/04/2025, 09:50

CANCELLED
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The self-heating of rubber is a less understood topic with only a few publications in the scientific area. Vibration absorber systems are constructed to avoid the movement of machines, vehicles and other devices. If vibration absorbers include rubber elements the vibration energy can be transferred into heat by the dissipation of the material. This publication concentrates...

160. Modeling rate-dependent damage effects in soft biological tissue

Maximilian P. Wollner

10/04/2025, 14:00

It is generally accepted that soft biological tissue shows inelastic material behavior, such as viscoelasticity and loss of stiffness after primary loading, akin to the Mullins effect in rubber. Recently, there has been experimental evidence suggesting a coupling of these rate-dependent and damage-related effects in porcine thoracic aorta [1]. Two observations in favor of this hypothesis are...

161. Relaxation Effects in Thermo-Visco-Elastic Materials

Frederik Hille

10/04/2025, 14:20

In recent years polymer materials experienced a high amount of interest for their exceptional suitability within lightweight engineering applications. To model their thermomechanical behavior it is crucial to sufficiently capture relaxation effects in mechanical as well as caloric quantities [1]. Possible approaches to handle these effects within a thermodynamically consistent framework are...

162. Viscoplastic modeling of shotcrete 3D printing

Quoc Tuan La

10/04/2025, 14:40

In recent years, Additive Manufacturing in Construction (AMC) has been gradually transforming the industry by offering a faster and more efficient way to build with concrete. Unlike traditional methods that rely on molds, AMC deposits material layer by layer, allowing new possibilities for custom designs and complex shapes. AMC also digitalizes the construction process, which helps reduce...

163. Modeling of the Visco-Plastic Compaction Behavior of Crushed Salt Based on Micromechanical Deformation Mechanisms

Ann-Kathrin Gartzke

10/04/2025, 15:00

Crushed Salt is used as a backfill material for closing nuclear waste repositories, with the advantage that this is a residual material of e.g. salt mining. As backfill it has different functions such as mechanical stabilization, heat transport and sealing. Numerical simulations play a crucial role for the long-term assessment of these safety functions and in enhancing our understanding of...

164. Modelling Material Behavior and Quantifying Recovery Strain in 4D Printed Shape Memory Polymers

Henrik Hembrock

10/04/2025, 15:20

In recent years, 4D printing has gained significant attention in the material modeling community. Unlike classical 3D Fused Deposition Modeling (FDM), 4D printing incorporates the dimension of time to the printing process. Recent publications have focused on characterizing printed materials, predicting their time-dependent behavior, and investigating the influence of infill patterns on the...

165. Aspects of a multiplicative viscoelastic material model for ice

Marvin Koßler

10/04/2025, 15:40

This study presents a thermodynamically consistent framework for modeling the viscoelastic behavior of ice under finite deformations, capturing its complex time-dependent mechanical response. A multiplicative decomposition of the deformation gradient into an elastic and viscous component is employed, reflecting the material's ability to accommodate both reversible and irreversible...

166. Neural networks meet hyperelasticity: On benefits and limits of polyconvexity

Dominik K. Klein

10/04/2025, 16:30

In this contribution, we present formulations for hyperelastic physics-augmented neural network (PANN) constitutive models that fulfill the polyconvexity condition. Polyconvex constitutive models are based on energy potentials which are convex functions in certain deformation measures. From a material modelling perspective, polyconvexity is desirable as it ensures a materially stable behavior...

167. Data-driven statistical learning of polymeric data

Vu M. Chau

10/04/2025, 16:50

The modeling of non-metals presents significant challenges due to the complex mechanical behavior of such materials. For instance, the constitutive parameters of polymers are often calibrated using homogeneous experimental data, which are typically oversimplified. Moreover, even when these models successfully replicate homogeneous experimental results, there have been no mathematical...

168. Data-driven statistical learning of textile reinforcements

Vu Ngoc Khiêm

10/04/2025, 17:10

Textile reinforcements offer numerous advantages over conventional materials, including net-zero emissions, net-zero waste, durability, and design flexibility, rendering them ideally suited for aerospace, automotive, marine, and defense sectors. Nevertheless, understanding and predicting the mechanical behavior of textile reinforcements, especially in complex scenarios like when fibers slide...

169. A Data-Driven Constitutive Model for Compressible Polymers

Hüsnü Dal

10/04/2025, 17:30

Compressible polymeric foams exhibit highly non-linear mechanical behaviour, predominantly influenced by their porosity and cellular architecture. Classical constitutive models, limited by fixed mathematical formulations, often fail to accurately describe this complexity. In contrast, data-driven constitutive modelling offers a flexible and robust alternative for capturing the intricate...

170. Parameter identification of a cold-box sand with a micromorphic continuum

Alexander Börger

10/04/2025, 17:50

This work is concerned with the modeling of a cold-box sand, a composition of sand grains and a resin binder. To this end, experiments are performed which show the following characteristics: localization phenomena in form of a shear band, softening behaviour in the force-displacement curve, asymmetric behaviour for compression and tension. For this complex material a micromorphic continuum is...

171. Numerical Analysis of the Forming Process for the Design of Tailored Fibre-Reinforced Thermoplastic Laminates

Philipp Kabala

10/04/2025, 18:10

Fibre-reinforced thermoplastic composites are increasingly employed in structural applications due to their short production cycles, high recyclability, and excellent specific strength and stiffness. The production of three-dimensional shell-like structures involves the thermoforming of fibre-reinforced thermoplastic laminates (FRTPLs). This draping of the fibres within the melted polymer...

172. Improved modelling of the microstructure around through-thickness reinforcements in composite laminates

Albrecht Radtke

11/04/2025, 08:30

The layered structure of composite laminates makes them susceptible to delamination. To counteract this, translaminar reinforcements can be introduced, which can slow down or stop crack propagation by bridging. Through-thickness reinforcements such as z-pins and stitching threads displace fibers of the laminate laterally during insertion. As a result, eye-shaped resin zones without fiber...

173. Investigation of Solution Accuracy in PFEM Simulations Using (Semi-)Analytical Benchmark Problems

Antaeus Bettmann

11/04/2025, 08:50

The simulation of large topological changes, such as those occurring in Cone Penetration Testing (CPT) and vibratory pile driving, still poses significant challenges in computational soil mechanics. Severe mesh distortions render classical approaches like the Finite Element Method (FEM) unsuitable, emphasizing the need for alternative methodologies. The Particle Finite Element Method (PFEM)...

174. Numerical modeling of soft interpenetrating composites with tunable anisotropy

Agata Mrozek-Czajkowska

11/04/2025, 09:10

Interpenetrating phase composites (IPC) are a class of materials with two continuous phases. The combination of a soft and stiff skeletal phase results in a combination of both properties, known e.g. from fiber-reinforced composites. We investigate composites made of 3D fiber networks in a hyperelastic silicone matrix for IPC, which exhibit strong, nonlinear mechanical behavior and energy...

175. A material model accounting for elasto-plasticity at finite deformations for paper and paperboard

Lilian Aurora Ochoa Ontiveros

11/04/2025, 09:30

Anisotropic elasto-plasticity, sensibility to temperature and moisture, wrinkling and damage occurrence are some of the phenomena needed to analyse for a better insight on the performance of a material. Due to this complex material behavior, the usage of certain materials, like paper and paperboard, has been hindered. These materials are highly sustainable and are mostly used in the packaging...

177. Phase field simulation of precipitation hardened ferroelectric material

Matthias Bohnen

11/04/2025, 09:50

Precipitation hardening is a heat treatment well known to enhance the mechanical properties of metals by introducing precipitation particles in the microstructure. However, this technique can also be applied to ferroelectric crystals, as recent studies have shown [2,3]. As an alternative to doping, it effectively reduces domain wall mobility as well as heat dissipation and by that enhancing...

176. Aspects of a multiplicative viscoelastic material model for ice

Marvin Koßler

154. Thermodynamically regularized computation of strain-induced crystallization

Mahmood Jabareen