Experimental and Model Based Mechanical Behaviour of Materials
The division Experimental and Model Based Mechanical Behaviour of Materials is engaged with experimental investigation and numerical simulation of the deformation, damage and failure behaviour of materials under complex thermo-mechanical loadings. The aim is to develop methods to enable systems, structures and components to be reliably designed and used.
Mechanical material tests are conducted under various conditions, including realistic service conditions (e.g. complex multi-axial stresses, different media, crack propagation under thermo-mechanical fatigue), enabling the collection of realistic data on ageing and damage processes. Optimised testing programs are developed for this purpose to keep the number of tests low.
The models employed use efficient numerical algorithms to minimise calculation time. Phenomenological and micromechanical models are employed to describe deformation and damage processes.
Fields of expertise
- Thermo-mechanical characterisation of engineering materials as well as stress and lifetime assessment of components using advanced experimental and numerical methods
- Range of materials: Steel, heat-resistant cast iron, polycrystalline and single crystalline nickel-based alloys, titanium aluminides, ceramics, fibre-reinforced composites with metallic and ceramic matrices
- Loading spectrum: single/multi-axial; monotonic/cyclic ; isothermal/non-isothermal
- Numerical implementation of complex deformation and damage models for stress analysis using commercial finite element software
- Experimental investigation and numerical simulation of deformation and failure under complex thermo-mechanical loading
- Enhancement and adaptation of new methods of thermo-mechanical material testing
- Enhancement and application of deformation and damage models to simulate material inelasticity and damage evolution
- Development of numerical models to describe the effects of various media
- Simulation of crack propagation
- Programming of subroutines for material and damage models in FE software
- Inelastic 3D FE analyses
Range of services/technical equipment
- Tension/compression testing
- Low cycle fatigue (LCF)
- Thermo-mechanical fatigue (TMF)
- Axial-torsional testing
- Creep/stress rupture testing
- Crack propagation measurement at high temperatures
- Hardness testing
- Resonance method for determining elastic modulus
- Determining parameters of material models
- Determining elastic constants of anisotropic materials
- Development of user-defined material subroutines (FEM)
- Development of deformation models
- Representation of failure mechanisms
- Development of lifetime assessment rules
The laboratory is accredited according to DIN ISO 17025 and Nadcap.
Publications of the division