Chimani, C. M. (1998). Micro- and macromechanical models for hybrid, selectively reinforced structures [Dissertation, Technische Universität Wien]. reposiTUm. https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-11446
Based on research in the field of micromechanics of materials in the present work numerical simulation techniques get employed and developed making it feasible to investigate the thermo-elasto-plastic behavior of selectively reinforced light metal structures. An overview of selected micromechanical methods for the analytical and numerical description of heterogeneous materials is followed by an examination whether these methods, especially the Mori-Tanaka method, give reliable results modeling composites containing curved fibers, as found e.g. in circumferentially reinforced axisymmetric composites. To model the thermo- mechanical behavior of selectively, circumferentially reinforced axisymmetric structures, two modeling techniques are employed for comparison, the incremental Mori-Tanaka approach and a hexagonal cell tiling approach. The stress distribution after cooling down from the manufacturing temperature is studied on the macro and micro level. Free edge effects occurring at intersections of material interfaces are studied in terms of the bimaterial wedge problem. Rules for an optimized interface design axe derived. Introducing a micromechanical embedding technique that explicitly accounts for the micro scale heterogeneity, it is found, that the singular solution predicted when homogeneous material descriptions are used, disappears for several important applications.