Comparison of the nonlinear elastic behavior of auxetic lattice architectures (Poster)

Mechanical metamaterials are man-made materials which derive their unusual properties from the geometry of their microstructure rather than their constituents. Auxetic metamaterials (materials with a negative Poisson’s ratio) exhibit mechanical properties in the (quasi) static regime that are potentially promising for impact protection, given...

Auxetic metamaterials for impact protection

This work investigates the impact protection properties of auxetic metamaterial lattices for impact velocities between 40 and 100 m/s, in a 1D impact scenario. After successful previous experiments and simulations with lower impact velocities and nylon samples, we now investigate whether or not the auxetic properties of such metamaterial are...

Modelling impact behavior of auxetic meta-materials using geometrically nonlinear lattices

An object-oriented geometric engine design for discontinuities in unfitted/immersed/enriched finite element methods

In this work, an object-oriented geometric engine is proposed to solve problems with discontinuities, for instance, material interfaces and cracks, by means of unfitted, immersed, or enriched finite element methods (FEMs). Both explicit and implicit representations, such as geometric entities and level sets, are intro duced to describe...

An interface-enriched generalized finite element formulation for locking-free coupling of non-conforming discretizations and contact

We propose an enriched finite element formulation to address the computational modeling of contact problems and the cou pling of non-conforming discretizations in the small deformation setting. The displacement field is augmented by enriched terms that are associated with generalized degrees of freedom collocated along non-conforming interfaces...

Efcient computation of states and sensitivities for compound structural optimisation problems using a Linear Dependency Aware Solver (LDAS)

Real-world structural optimisation problems involve multiple loading conditions and design constraints, with responses typi cally depending on states of discretised governing equations. Generally, one uses gradient-based nested analysis and design approaches to solve these problems. Herein, solving both physical and adjoint problems dominates...

Future Blades - how will we develop the wind turbine blades of 2040

Expecting a 27MW Horizontal-Axis Wind Turbines (HAWT) platform to be the norm for wind turbines in 2040, the blades will have to be around 145m long. This will require a robust blade design, taking into account all inherent uncertainties of the design, production, testing, and operation to accurately predict lifetime and obtain reliable...

Optimization and redesign of a structurally loaded fused filament fabrication component: Numerical and experimental validation - Preprint -

Additive manufacturing provides the possibility to manufacture parts on demand and offers tremendous form freedom compared to traditional manufacturing methods. However, Fused Filament Fabrication (FFF) is not yet widely used for highly structurally loaded parts, as their strength is hard to control and to predict. In this work we aim to analyze...

Computational modeling of metamaterials for impact protection (Poster)

Mechanical metamaterials are man-made materials which derive their unusual properties from the geometry of their microstructure rather than their constituents/composition. Auxetic metamaterials (so-called negative Poisson’s ratio materials) have been demonstrated to exhibit a number of mechanical properties in the (quasi) static regime that are...

Exploring additional solutions for freedom mechatronics

Metamaterials is a rapidly developing field of research. It offers the prospect of material properties that do not exist in regular materials and which might be useful for overcoming hurdles in current mechatronic system design. Stimulated by the progress in additive manufacturing (AM) that has enabled fabrication of materials with complex...