The Engineering Analysis group focuses on experimental, computational and consulting services in the areas of reliability assessment and possible optimization of machinery according to customer requirements, research and development of ductile fracture criteria and their implementation into FEM codes and an assessment of residual stresses.
Following services can be offered to those interested:
- computational analysis of stress and strain, the assessment of safety, reliability, and possible optimization of structures,
- numerical simulation of selected technological operations,
- analysis of the dynamics of rotor systems,
- computational and experimental analysis of noise, vibration and modal properties of mechanical structures,
- experimental stress analysis using resistive strain gages and optical methods under the static and dynamic loads of machine parts and systems, including the determination of residual stresses,
- research and development of mechatronic systems.
The Ductile fracture group focuses on the prediction of ductile fracture of polycrystalline metallic materials under the monotonic loading. The focus follows the development of damage in the body, either through the simple phenomenological criteria, or by the continuum damage mechanics. The research involves the development of ductile fracture criteria, design of specimens and procedures for calibration, and actual calibration of models and their use for prediction of the cracks.
The activities of the Simulation of forming operations builds on the previous theme of ductile fracture, which extends to models of the cyclic plasticity of metals, especially for the (extremely) low-cycle loading. These models are particularly useful for the simulations of technological operations, such as cutting, extrusion, shaping, machining of metal semi-finished products or straightening of long semi-finished products.
The Residual stress group deals with the theoretical aspects and practical implementation of measuring the residual stresses using the hole-drilling method, especially in situations that are still problematic for various reasons. These include the correct determination of errors of estimated residual stresses when there was a plastic deformation around the hole, when the hole was eccentric according to the centre of the strain gauge rosette, possibly when there was inaccurate knowledge of material characteristics.
prof. Ing. Jindřich Petruška, CSc.
doc. Ing. Tomáš Návrat, Ph.D.
Ing. Lubomír Houfek, Ph.D.