GAMM2025

Session

S03: Damage and fracture mechanics

S03

8 Apr 2025, 08:30

Lecture and Conference Centre

Conveners

S03: Damage and fracture mechanics: S03.01

• Martha Kalina

S03: Damage and fracture mechanics: S03.02

• Andreas Ricoeur

S03: Damage and fracture mechanics: S03.03

• Markus Kaestner

S03: Damage and fracture mechanics: S03.04

• Fadi Aldakheel

S03: Damage and fracture mechanics: S03.05

• Abedulgader Baktheer

S03: Damage and fracture mechanics: S03.06

• Fadi Aldakheel

Description

Failure of materials and structural components is an important issue as long as man-made constructions exist. The section focuses on damage mechanics and fracture mechanics for all kinds of solid materials and structures. It aims at bringing together related original research covering experimental observations, modeling approaches and numerical techniques. Moreover, material failure is a complex process, which may be considered on different length scales ranging from atomistic scale up to macro scale of engineering structures. Since failure behavior of materials strongly depends on loading situations, contributions addressing static, dynamic and multi-axial failure are welcome as well as fatigue problems.

26. Sideways Cracks in Elastomers: Experimental Insights & Phase-Field Modelling

Miguel Angel Moreno-Mateos

08/04/2025, 08:30

We explore experimentally and computationally an unconventional class of fractures in elastomers: sideways cracks. Under certain conditions, a crack propagates in a (sideways) direction parallel to the loading direction rather than perpendicularly in the (forward) direction of the notch. Then, the crack arrests, and the material ahead of the crack can be further deformed enabling giant...

27. Uncertainties in phase-field fracture simulations of simple experiments

Silu Zhang

08/04/2025, 08:50

The phase-field approach to fracture is a widely recognized effective method for simulating crack initiation and propagation. The standard phase-field method is based on the crack propagation model formulated by Francfort and Marigo (1998), which is based on energy minimization and was later regularized by Bourdin et al. (2000). This study compares simple experiments with phase-field...

28. A geometrically exact phase field approximation of cohesive fracture

Jörn Mosler

08/04/2025, 09:10

Cohesive zone models provide a promising framework for modeling nonlinear fracture processes. Unlike brittle fracture, where the crack energy remains constant, cohesive zone models assume that the energy depends on the crack opening. This dependency gives rise to a traction-separation law, which describes the traction as a function of the crack opening.
In the finite element approximation of...

29. A phase-field fracture model of nearly incompressible hyperelastic material based on a mixed formulation

Le Zhang

08/04/2025, 09:30

Hyperelastic materials play a crucial role in current applications due to their unique properties, especially their flexibility, stretchability, and resilience based on incompressibility. However, the incompressibility constraint is an unavoidable challenge in the modeling of most hyperelastic ma- terials, and makes it even more challenging to successfully explain or reproduce crack...

30. Phase-field modeling for failure behavior of polymer fiber-reinforced high-performance concrete using the Schapery viscoelastic model

Marcos Andre Margalho de Barros

08/04/2025, 09:50

Concrete and cement-based materials are known to describe a brittle failure. Thus, fiber reinforcement is used to enhance the post-cracking properties of the material. In this regard, the polymer fibers arise as an environmentally friendlier alternative to steel fibers. However, the effect of their characteristic viscoelastic behavior on the performance of fiber-reinforced concrete requires...

31. An extended phase-field method for the efficient simulation of fracture processes

Stefan Löhnert

08/04/2025, 10:10

During the last years, the phase-field method for fracture has gained a lot of attention. It has become the most frequently used method for the simulation of quasi-static and dynamic fracture processes for brittle and ductile materials. Its biggest advantages are the simplicity of the implementation and the fact that it can capture crack propagation, branching, coalescence and initiation...

32. Three-dimensional simulation of crack initiation in ice shelves at pinning points

Rabea Sondershaus

08/04/2025, 16:30

Ice shelves are large floating plates of ice in the ocean that are still connected to the inland ice of a glacier. Due to elevations in the bathymetry, the ice shelf can be partially grounded. These areas are called pinning points and satellite images show that cracks often form at these locations.

To better understand the crack formation, three-dimensional fracture simulations are carried...

33. A 2D Approach to Predict the High-Cycle Fatigue Life of Clinched Joints

Chin Chen

08/04/2025, 16:50

Clinching, as a versatile joining process capable of bonding different sheet materials, is widely used in the automotive industry to meet the demand for lightweight structures. Consequently, understanding and improving the fatigue strength of clinched joints is of significant importance. Accurate fatigue life prediction during the design phase can help reduce costs and minimize safety...

34. Dynamic fracture with thin structures and bond-associated peridynamics

Kai Partmann

08/04/2025, 17:10

Peridynamics is a nonlocal continuum mechanics formulation widely used for modeling fracture phenomena. The standard peridynamic models, introduced by Silling in 2000, are particularly effective in modeling damage and fracture under large deformations. However, these models have significant discretization errors in elastic modeling due to nonlocality and surface effects, especially in thin...

35. Assessment of the debonding failure in multilayer structures using a closed-form analytical model

Wilfried Becker

08/04/2025, 17:30

In mechanical engineering, aerospace engineering, and civil engineering there are many situations where multilayer structures are applied. This can, for instance, be the overlap region of an adhesive joint, a local patch reinforcement on a substrate, or a substrate with a protective layer. Under given mechanical or thermal loading due to the dissimilar material properties typically stress...

36. An explicit finite element solver for a dynamic formulation of gradient-enhanced damage

Lennart Sobisch

08/04/2025, 17:50

Explicit finite element solvers are commonly used for the simulation of sophisticated industrial processes. These methods are particularly beneficial in scenarios characterised by high strain rates, complex contact interactions, or rapid failure processes, making them indispensable for simulating manufacturing operations such as forming processes or impact loading. To capture the localisation...

37. Simulation of crack surface friction within the phase-field method

Leonie Koch

08/04/2025, 18:10

Cracks and the associated frictional forces that arise under combined compressive and shear loads at the crack surfaces can significantly impact the material behaviour, which is particularly relevant if the load direction changes after the formation of the cracks.

The phase-field method is a powerful method for the simulation of cracks and their propagation, enabling automatic handling of...

38. Phase-field modelling of ductile fatigue fracture

Martha Kalina

10/04/2025, 08:30

Phase-field modelling of fatigue fracture has been approached by many different models in recent years. Yet due to the high number of load cycles involved, computational time remains one of the main challenges, especially for fracture in ductile materials such as metals.
In this contribution, we revisit our efficient phase-field model for fatigue fracture [1] with a simplified consideration...

39. A Fracture Criterion for the Prediction of Complex Fracture Patterns and Fragmentation in Tempered Glass

Anas Kanan

10/04/2025, 08:50

Fragmentation of tempered glass is a dynamic fracture process that is continuously fed by internal residual stresses, where uninterrupted crack propagation, branching, merging of cracks, and formation of fragments take place in a glass pane until complete failure. The simulation of those complex crack patterns using fracture approaches and the finite element method can be challenging, due to...

40. Anisotropic brittle damage models at finite strains

Tim van der Velden

10/04/2025, 09:10

Anisotropic damage models are required to fulfill the damage growth criterion and to yield mesh-independent results in structural simulations. The former can be achieved by a proper design of the elastic free energy and the latter by a suitable regularization, e.g. by a gradient-extension. Here, we compare the performance of different elastic strain energy formulations for anisotropic damage...

41. A Regularized Continuum Damage Model Based on Endurance Surfaces for Fatigue Prediction

Klas Feike

10/04/2025, 09:30

Controlling damage evolution in the context of fatigue plays a key role in extending the number of operational cycles. A major challenge lies in accurately capturing the material response and loading conditions. This work particularly aims at the numerical prediction of fatigue in quasi-brittle materials. Such simulations are relevant to complement experiments by completing and extending the...

42. An analytical and numerical approach for the description of damage-free disassembly of joined CFRP structures

Janko Kreikemeier

10/04/2025, 09:50

Bonded CFRP structures offer advantages over conventionally manufactured structures due to their potential processing speeds, pre-equipment capabilities, reparability, and maintenance friendliness. Fundamentally, an as-yet untapped potential lies in the ability for damage-free debonding and rebonding, enabling structural components to be repurposed for new applications at the end of their...

43. Predicting fatigue lifetime of high-strength concrete using physics-informed neural networks

Abedulgader Baktheer

10/04/2025, 14:00

Accurate lifetime prediction of concrete structures under fatigue loading is vital, particularly in scenarios involving nonuniform loading histories where load sequencing critically influences structural durability. Addressing this complexity requires advanced modeling approaches capable of capturing the intricate relationship between loading sequences and fatigue life [1,2]. Traditional...

44. Autoencoder based non-intrusive model reduction of damage simulations

Tim Brepols

10/04/2025, 14:20

Damage simulations play a critical role in assessing structural integrity and understanding material failure under various conditions. However, their computational cost is often a significant challenge, especially in scenarios requiring repeated simulations such as design optimization, uncertainty quantification, and real-time decision-making. Traditional model reduction techniques such as the...

45. A 'Capriccio light' approach to study the capabilities of multiscale fracture simulations of thermoplastics

Eva Maria Richter

10/04/2025, 14:40

Simulating fracture and especially the fracture of thermoplastics still proves to be difficult. It yet remains unclear what exactly happens at a molecular and atomistic level when thermoplastics fail, which is rooted in the multiscale nature of the problem. Before profound multiscale simulations based on the “Capriccio” method as a multiscale domain-decomposition approach can be set up,...

46. Predictability of fracture mechanical quantities based on chemically specific multiscale simulations

Sebastian Pfaller

10/04/2025, 15:00

Accurate prediction of fracture mechanical quantities based on the atomistic and molecular structure of matter has the capability to provide a deeper understanding of failure processes and can open new approaches to material design. However, many challenges exist towards this ambitious goal particularly for amorphous materials – mostly rooted in the tremendous difference in length and time...

47. A Mixed Three-Field Variational Formulation for Phase-Field Fracture Modeling of Elastomer Materials

Nima Noii

10/04/2025, 16:30

Understanding the fracture mechanism of elastomeric materials is essential for ensuring the reliability and durability of numerous engineering applications. Rubbers, which exhibit large elastic deformations and energy-dissipative behavior, are susceptible to crack initiation and propagation under monotonic and cyclic loading. So, this work presents a mathematical formulation of the mixed...

48. Configurational forces for mixed-mode crack loading and growth analysis with the virtual element method

Kevin Schmitz

10/04/2025, 16:50

The virtual element method (VEM) is a modern discretization scheme for the numerical solution of boundary value problems on polytopal grids. It has proven to be an efficient alternative to the Finite Element Method (FEM) in recent years and is most prominently known for offering considerable flexibility in the meshing process. In the context of numerical applications of fracture mechanics, one...

49. Analysis of dynamically loaded cracks with the virtual element method

Philipp Wappler

10/04/2025, 17:10

Cracks in elastic materials represent an extreme form of notches which, due to high local stress concentrations at their tips, tend to grow even under moderate external loads. This growth can compromise the integrity of technical or natural structures and potentially leads to failure. Highly dynamic loads, such as impacts, further exacerbate this process and may result in catastrophic...

50. Determination of the Effective Crack Resistance in Porous Materials Using a Fracture Phase-Field Model

Alexander Schlüter

10/04/2025, 17:30

This work focuses on the simulation-based determination of the effective crack resistance in het- erogeneous—and specifically porous—materials. We follow the approach of Hossain et al. [1] for a numerical experiment that enables the identification of effective crack resistance as a material parameter. Displacement boundary conditions corresponding to a steadily growing crack on the macroscopic...

52. Mechanical Behavior and Damage Evolution in Additively Manufactured Spinodoid

Vishal Sreenivasa

10/04/2025, 17:50

The main aim of this research is to study the mechanical behavior and damage evolution of additively manufactured spinodoid metamaterials under quasi-static loading. Additive manufacturing (AM) is a transformative method that constructs parts layer-by-layer from a digital 3D model, enabling the creation of complex geometries and reducing costs associated with assembly. Spinodoid metamaterials...

51. A Stochastic Phase-Field Approach for Ductile-Like Fracture of Rubber-Like Materials

Bülent Efe Tanış

10/04/2025, 18:10

The classical phase-field approach [1] assumes a homogenized distribution of the critical energy release rate, which leads to catastrophic failure and brittle fracture [2,3]. However, experiments on the fracture behaviour of rubber-like materials imply the existence of a ductile-like progressive failure mechanism [4,5]. The sensitivity of the material parameters governing elastic mechanical...

53. A gradient-enhanced JH2 model for dynamic simulations of concrete structures

Sjard Mathis Rosenbusch

11/04/2025, 08:30

Concrete structures subjected to impact and blast loads experience complex failure mechanisms that are challenging to simulate accurately. Local constitutive models formulated using plasticity with softening are commonly used for this purpose. The softening behavior is typically represented by a scalar damage field, which scales the yield surface to capture the degradation of material...

54. Numerical Model of Crack Propagation in Elasto-Plastic Material Using Griffith and Cohesive Zone Models

Jarosław Rusin

11/04/2025, 08:50

This study presents the development and implementation of a numerical model to analyze crack propagation in elasto-plastic materials using Griffith's criterion and cohesive zone models (CZM). The research focuses on bridging the gap between classical fracture mechanics and advanced micromechanical approaches to predict material failure under complex stress states. By integrating these...

55. Proposing a Linear Failure Index for the Christensen Criterion for Use in Finite Element Analyses

Mathis Hach

11/04/2025, 09:10

The failure criterion proposed by Christensen is a two-parameter failure criterion with two sub-criteria [1]. The criterion applies to all isotropic non-porous materials ranging from ductile materials like aluminum over polymers and cast iron to brittle materials like concrete or rocks. It contains the von Mises criterion as the limit case for ideally ductile materials and the Rankine...

56. Simulation study of direct-shear test on FRP-to-concrete bonded joints

Iwona Jankowiak

11/04/2025, 09:30

In the study some results of numerical analyses performed on FRP-to-concrete bonded joints for direct-shear tests are presented. These results will support better preparation for experiments planned on real-scale elements.
Externally bonded fiber-reinforced polymer (FRP) materials have been for years widely used as an alternative method to traditional techniques of strengthening of concrete...

57. Numerical Method for Determining Material Stability Loss During Large Deformation

Jacek Jackiewicz

11/04/2025, 09:50

Material instability is often associated with the loss of ellipticity for the constitutive equations of the considered material. Determining when ellipticity is lost using the acoustic tensor is a bit complicated. For each load increment value of the updated Lagrangian formulation, the algorithm must assess the tangent modulus tensor at each point in the material. Accordingly, the...

58. Wavelet-based random finite element analysis of dynamically loaded steel girders

Anna Knitter-Piątkowska

11/04/2025, 10:10

The main objective of this work is to analyze damage detection in certain steel lattice structures using the Discrete Wavelet Transform (DWT) [1]. A structural response signal of a considered structure may be considered as a discrete set of static or dynamic displacements, which can be processed further using this DWT. It allows for high accuracy and high-resolution estimation of possible...