@phdthesis{Shlychkova2023, author = {Shlychkova, Darita}, title = {Lightweight structured steel members : properties and application}, issn = {1611-5023}, doi = {10.26127/BTUOpen-6531}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-65311}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {This thesis is dedicated to the structured sheet metals topic. Structured sheet metals are semi-finished products with the honeycomb (cell) shape, made by cold forming of the flat sheets. They represent an innovative technology in the field of lightweight construction. In recent years, this technology has undergone dynamic development what gives to researchers possibilities to improve the level of knowledge about structured sheets metals properties and explore new application fields for them. The structuring improves basic properties, such as stiffness, compared to the flat sheet material. Due to these advantages, the use of structured sheet metals offers enormous innovation potential for efficient lightweight construction in many industrial sectors such as aerospace, rail transport technology, architectural products. Structured sheets have already been implementing in lighting technology, in the manufacture of household appliances and even in automotive industry. So that, the question arises if it possible to apply this kind of material successfully in other areas such as building industry. This work contains an overview of the lightweight constructions historical development and stiffening elements in the steel industry, also the creation process of structured sheet metals, manufacturing investigated specimens, further bending tests, numerical simulations, analysis and comparison of resulting data and possible further use of lightweight beams with structured sheet elements as a building construction. In this work beams compound of structured and flat plates are investigated. Steps of structured plates manufacturing process are described: hydroforming, point- and laser welding and bending. As a result, lightweight beams of two main shapes are manufactured: C- and square sectioned. There are four types of beams for each of the shapes are investigated. Every type has same geometrical dimensions, but thicknesses vary. The series of laboratory tests with created beams under load is made. Three- and four-points bending tests are chosen for that. This work also presents numerical analysis based on conducted experiments: buckling and global non-linear behavior of specimens by use of the software package ABAQUS/CAE are obtained. The behavior of the beams with structured and flat sheets under load is analyzed and the comparison of parameters such as load bearing capacity and stiffnesses is made. Finally, in addition to laboratory and simulations, parametric modelling is done. Also, based on parametric calculations, the proposal for calculation the beams stiffness for with higher thicknesses is given. It allows to predict the behavior of beams with structured sheets with different thicknesses without manufacturing and conducting the expensive and time-taking laboratory experiments. In conclusion, the recommendations for the simplifying of manufacturing process and for the improving of the beams stiffnesses are given.}, subject = {Lightweight constructions; Sandwich members; Structured sheet metals; Leichtbau; Sandwichelemente; Strukturierte Bleche; Leichte Stahltr{\"a}ger; Tr{\"a}ger; Blech; Strukturiertes Blech; Belastung; Tragverhalten; Steifigkeit}, language = {en} }