Computational Structural Mechanics

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Our group is developing original mechanical models and more efficient numerical methods to design optimised structures.

We implement optimisation engines based on mathematical programming as well as evolutionary algorithms in combination with our own numerical tools for solving real-world engineering problems. Their complexity can be elegantly represented by knowledge-based CAD parametric-associative models, thereby facilitating the solution processes.

Research Projects

Structural Response and Manufacturing Methods of Corrugated Laminates

Our research addresses the understanding and modelling of the peculiar structural response of corrugated laminates with high corrugation amplitude, where the periodic corrugation shape consists of circular segments, as well as questions of kinematic and material processing aspects in view of the undercuts of the corrugation pattern. The modelling needs for the structural behavior include the mapping of transverse shear stiffness for homogenized substitute plates.
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Hyperelastic Hybride Membrane For Biomimetic Blood Propulsion

This project is dealing with the development of an implantable single-ventricular pump based on a hyperelastic hybrid membrane. The objective is to develop a pump with focus on the minimization of in-plane deformation and wall shear stress (WSS) in the actuating hyperelastic hybrid membrane.
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New Analysis Methods for Corrugated Laminates

Our research addresses questions of the understanding of the mechanical behavior, the mechanical modeling, and design of corrugated laminates made from fiber-reinforced plastics. New mechanical and structural models are developed for accurately analyzing and efficiently simulating the structural response of corrugated laminates.
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Research Projects - Concluded  

Stress state and behavior of multidirectional laminated tube test specimens composed of unidirectional (UD) laminas

The work will contribute to a new sheet of "Luftfahrttechnisches Handbuch" (LTH). Read More

Lightweight RF Power Cables with High Phase Stability

The objective of this activity is to design, manufacture and test radio-frequency (RF) cables for space applications with excellent phase stability and with a significant reduction in the overall weight compared to current cables. This will become critical in the new generation of telecom cables.
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Sensitivity-Based Optimization of Laminated Composite Structures with a New Parameterization Concept

New methods for optimization of eigenfrequencies and buckling loads of space structures made from laminated composites will be developed. The new "Ghost-Layers" concept allows to obtain gradient information to find solutions to the inherently discrete design optimization problem. Read More

Mechanics and Structural Properties of Corrugated Laminates with Extreme Anisotropy

The anisotropy of composite materials, and of plates made thereof, is greatly surpassed by the geometry-caused anisotropy of corrugated laminates. The project focuses upon understanding of the mechanics of corrugated laminates, derives substitute plate models, and explores application aspects. Read More

Cost Efficient Advanced Leading Edge Structure 2 (COALESCE2)

The quest for lower manufacturing costs of airplane wing leading edges requires new design principles and materials. We will apply our know-how in aerospace structural design optimization with Evolutionary Algorithms to identify solutions meeting all critical design criteria.
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Integration of an optimization software for composite aerospace structures into the design phase of the development process

Goal of the project is to develop software for the automated preliminary process and the optimization of laminated composite space structures. Subsequently, this software should be included in the development process of Oerlikon Space AG. Read More

Unified Topology and Shape Design Optimization of Composite Structures with Evolutionary Algorithms

The project focuses on a method enabling the computational optimization of topology, shape and laminate attributes of composite structures. The geometry is represented with splines whereas the attributes are hold in a graph. An Evolutionary Algorithm is adapted to work on this new representation.
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Impact of uncertainties and interactions on mass estimation in a multidisciplinary environment

The goal of this project is the reliable weight estimation of a commercial aircraft structures by using a multidisciplinary process environement.
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Maximum-Strength Design of Bonded Joints

Development and validation of numerical optimisation methods to design optimum onserts.
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Mechanical Model and Finite Shell Element for Interlaminar Stresses in Moderately Thick Curved Laminates

Shell elements calculating both interlaminar shear and normal stress are not yet available in FEM-codes. Project is investigating a new model to determine the exact solution to for the through-the-thickness distribution of the out-of-plane displacement and interlaminar normal stress distribution.
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FELyX - the Finite Element Library eXperiment

FELYX is an object oriented Finite Element library written in C++.

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Investigation of failure onset at free edges of composite materials

Failure due to the free edge effect in laminated composites is investigated. Quasi-periodic failure patterns, observed in experiments, shall be described as a combination of interacting mechanical phenomena and failure events. They shall be predicted by appropriate strength and toughness criteria.

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Interlaminar stresses in doubly curved laminates

Sintered Load Introduction Elements for Lightweight Structures

This joint project at the Hochschule für Technik Rapperswil, at the Hochschule Ravensburg-Weingarten, and at the Centre of Structure Technologies deals with the design, simulation, manufacturing and testing of sintered load introduction elements for lightweight structures.
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Design-Entity and Genotype Handling in Evolutionary-Algorithm Based Structural Optimization

Structural Optimization is of great practical interest. This project addresses new strategies for the handling of variable-length genotypes. The new handling strategies can open up the design space, increasing the probability of discovering unexpected design solutions.
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Parametric-associative CAE methods in aircraft pre-design

The aim of the project is to improve accuracy, efficiency and the flexibility of current pre-design methods in the aircraft construction with the help of modern Computer Aided Design and Engineering (CAD/CAE) systems and methodologies.
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FLEXBOND: Dimension of Elastic Adhesive Bondings

The aim of this project is to dimension elastic adhesive bondings with simultaneous consideration of large deformations. Adhesives are increasingly used in modern day assembly operations.
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Optimization of Laminated Composite Structures

The project deals with the structural optimization of load-carrying components made of fiber-reinforced composite materials.
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Development of High Performance CFRP Motorcycle Rims by Using Innovative Evolutionary Optimization Strategies

The project realizes competitive lightweight CFRP rims for GP1 racing motorcycles. A low mass inertia is of central significance for the performance.

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Design-Entity based Structural Optimization with Evolutionary Algorithms

There is worldwide an increasing need for improving design solutions at lower development costs and time. In this context this project is investigating novel encoding schems in conjonction with evolutionary design optimisation of Structural parts.
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ODeMeCoS - Optical Device for Measuring Complex Structures

The aim of this project was the development and experimental in-depth study of an accurate, reliable and easy-to-use optical measurement device to examine the deformation behaviour of complex shaped structures made from advanced materials.
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Iterative Solution Methods for Sequential Processes

Damage progression simulation solves a sequence of systems of equations which differ from each other only by the effects of a damage increment. Direct solution of the virgin-structure equations provides a preconditioner for solving the sequence of system equations by iterative solution techniques.
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INCOMPRO - Intelligent Composite Products

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