Florian Gutknecht

Florian Gutknecht
Technische Universität Dortmund | TUD · Institute of Forming Technology and Lightweight Components

About

12
Publications
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67
Citations

Publications

Publications (12)
Article
Full-text available
Background Many metals exhibit a stress overshoot, the so-called cross-hardening when subjected to a specific strain-path change. Existing tests for sheet metals are limited to an equivalent prestrain of 0.2 and show varying levels of cross-hardening for identical grades. Objective The aim is to determine cross-hardening at large strains, relevant...
Article
Full-text available
For many metals, a transient variation of the yield stress can be observed when changing the orientation of a load-path. Such behavior affects the manufacturing process itself, e.g. by increasing forming forces, altered material properties or springback of the manufactured components. Hence, the aim of this work is to develop a novel experimental s...
Article
Full-text available
The evolution of damage in geared components manufactured from steel sheets was investigated, to analyse the influence of damage caused by the sheet-bulk-metal forming. Due to the inhomogeneous and multi-axial deformation in the investigated parts, different aspects such as the location-dependent shape and size of voids are analysed by means of var...
Article
Shear-cutting is one of the most important manufacturing processes involving sheet metal. The local pressure on the tools as well as the sliding speed between tools and work piece are much larger in shear cutting than in typical forming processes such as deep-drawing. This makes the prediction of tool life more critical in a shear-cutting simulatio...
Chapter
In sheet-bulk metal forming processes the hardening behavior of the material depends on the sequence of deformation steps and the type of deformation. Loading path changes induce transient hardening phenomena. These phenomena are linked to the formation and interaction of oriented dislocation structures. The aim of this study is to investigate the...
Article
The paper presents numerical and microstructural investigations on a punching process of 2 mm thick steel sheets. The dual phase steel DP600 and the mild steel DC04 exhibit different damage and fracture characteristics. To distinguish the void development and crack initiation for both materials, interrupted tests at varied punch displacements are a...
Article
Full-text available
Shear cutting is still the most preferred process in industry for separation of sheets. An enhanced fully-coupled Lemaitre model is applied for the description of the material behaviour. The local damage model considers the influence of shear and compression-dominated stress states on the propagation of damage. A time-efficient approach for paramet...
Article
Full-text available
Metal polymer sandwich sheets consist of materials with drastically different mechanical properties. Due to this fact and because of high local gradients in the cutting zone during the blanking process, traditional process strategies and empirical knowledge are difficult to apply. A finite-element simulation of the shear cutting process is used to...
Article
The increasing interest in modelling local deformations and damage evolution within materials with complex microstructures led to an increasing demand for efficient numerical methods. A method designed to study damage evolution within the microstructure should be able to deal with complex geometries and to capture system sizes that are large enough...
Conference Paper
Calculation of continuous fibre-reinforced-plastics (FRP) for aircraft and automobile applications is usually conducted by using Classical Laminate Theory (CLT), in which inhomogeneous composite plies are considered as homogeneous material. For representing the elastic behaviour of FRPs the CLT-method is well suited. However, plastic and damage beh...

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Projects

Project (1)
Project
Analysis of Load History Dependent Evolution of Damage and Microstructure for the Numerical Design of Sheet-bulk Metal Forming Processes