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Nonlinear analysis of reinforced concrete structures
Král, Petr ; Salajka, Vlastislav (referee) ; Hradil, Petr (advisor)
The aim is to design and evaluate nonlinear beams analysis, which will be subjected by four – point bending. Nonlinear analysis will be performed and evaluated on three beam models, the first of which will be made from plain concrete, the second of which will be made from reinforced concrete with reinforcement bars in the domain of tensile stress and the third of which will be made from reinforced concrete with reinforcement bars in domains of tensile and compressive stress. The thesis will be included formation of appropriate FE models, performance of nonlinear calculations with using nonlinear material model from a library of nonlinear material models multiPlas in the programming environment of software ANSYS and subsequent evaluation of results. Evaluation of results will consist from evaluation of nonlinear beams analysis and from evaluation of beams analysis according to ČSN EN 1992 – 1 – 1 without reinforcement bars and with reinforcement bars in these variants, next from comparison of nonlinear beams analysis with a beams analysis according to ČSN EN 1992 – 1 – 1 and finally from evaluation of the yield condition, which will be applied to the beams.
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Experiments in directional distortional hardening—determination of mechanical properties of the S355J0 grade structural steel
Parma, Slavomír ; Ciocanel, C. ; Seiner, Hanuš ; Hrubý, Zbyněk
In order to carry out comprehensive experiments in the research of directional distortional hardening phenomenon, some basic mechanical properties of S355J0 structural steel are determined. Particularly, attention is payed to the determination of elastic properties of the material, determination of anisotropy of the material induced by the manufacturing technology of specimens, and determination of elasto-plastic behavior of the material. Elastic properties of the material are measured via an ultrasound method, elasto-plastic behavior is analyzed from the tensile and torsional testing. Conclusions of the report are intended for design and evaluation of the comprehensive experiments mentioned.
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Book of Abstracts: 17th International Conference on the Strength of Materials
Dlouhý, Antonín ; Kunz, Ludvík
The Book of Abstracts covers twelve exciting scientific topics addressed by the International Conference on the Strength of Materials 17 (ICSMA 17). Eight excellent plenary speakers were selected based on the discussion and vote within the International Committee of ICSMA. The topics include not only traditional areas like cyclic or high temperature deformation and scale-bridging modeling but also still growing subjects of nano-micro scale experiments and the strength of biological systems. Moreover, the Local Organizing Committee, in cooperation with the Department of Materials Physics, Charles University in Prague, has decided to highlight the 80th anniversary of Prof. Pavel Lukáč, a brilliant international teacher and scientist. The thirteenth topic of the ICSMA 17 is thus dedicated to honour his contribution to materials research. Altogether, the Book presents 376 abstracts evenly distributed among the individual research areas that entered the scope of the conference.
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How predation risk affects the growth and development of dragonfly larvae?
PEROUTKA, Miroslav
Predation and prey responses to predators in aquatic environment are reviewed with emphasis on non-lethal effect of predators on prey life history, antipredator behavior and related mechanisms. The review focuses on dragonfly larvae and other groups of prey with complex life histories, mainly anurans. The review is complemented by laboratory experiments examining the effects of varied food availability and predation risk on a selected species of dragonfly, Sympetrum vulgatum.
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Functional trait plasticity in grassland plant species
HAVLÍK, Tomáš
Plant functional traits (plant height, aboveground biomass, R/S ratio, specific leaf area, leaf dry matter content, specific root length and arbuscular mycorrhizal infection) were measured for several grassland plant species growing under different soil fertility conditions in a greenhouse and a field experiments. Traits` response to nutrient addition and the differences in traits among species and between forbs and grasses were studied. Results from the greenhouse and the field experiment were compared.
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Modelling of nanoindentation of modern Nickel-based superalloys for turbofans
Hrubý, Zbyněk ; Plešek, Jiří ; Tin, S.
Stress and strain distribution underneath various types of indentors – spherical, conical, and Berkovich – can be provided by the finite element method. In the presented work, indentation of isotropic aluminium is introduced as a benchmark problem, in which plasticity and contact algorithms are tested. The knowledge obtained in this way passes on to the real-life indentation processes involving orthotropic materials such as FCC metals (Ni-based alloys) in the context of nonlinear continuum and finite strain elasto-plasticity, including homogenization approach on the material microscale.
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