This thesis presents the software program for multilayer structural elements design. The main users of the software should be bachelor and master students of mechanical technology department and their professors as well. The program can be successfully applied for computations of mechanical characteristics of the real (industrial) problems. This program is able to choose the multilayer structural elements type and its mechanical and geometrical parameters. While the program is running the user can watch the calculated values of the parameters, plots of the main dependencies and explanations of main operations being performed with the program variables. The algorithm of the program assumes that the model multilayer structural elements is idealized, i.e. uniaxial stretching, which is simple and quite adequate. The program is developed for training purposes, so the algorithm used is idealized and not sophisticated but preserving the main features of multilayer structural elements calculation. There is given a comparison of the program with the similar one calculating two materials composite developed by foreign researchers. The program calculates three most often used multilayer structural elements structures (there is no limit of the amount of layers). The presented original program is written in Microsoft programming language Visual Basic 6 and can be used on computers running Windows 9x/Me/Xp.

Baigiamajame magistro darbe tirta popieriaus paviršiaus ir mechaninių savybių kaita spausdinant fleksografiniais dažais ir keičiant dažų sluoksnio storį. Tyrimams buvo pasirinktos šešios kreidinio ir nekreidinio popieriaus rūšys. Buvo tirtos šių mechaninių ir paviršiaus savybių kaita: spalvinės charakteristikos, atsparumas tempimui ir pailgėjimas, atsparumas lankstymui, PPS šiurkštumas, trinties savybės, popieriaus sugertis. Buvo nustatyta, kad fleksografiniai dažai didina popieriaus šiurkštumą, trūkio jėga ir atsparumas lankstymui visada yra didesni išilgine popieriaus kryptimi, atsparumas tempimui nepriklauso nuo dažų sluoksnio storio, o atsparumas lankstymui mažėja. Darbą sudaro 6 dalys: įvadas, literatūros apžvalga, tyrimo metodika, tyrimų rezultatai ir jų aptarimas, išvados ir siūlymai, literatūros sąrašas. Darbo apimtis – 83 psl. teksto be priedų, 82 iliustracijos, 1 lentelė, 28 bibliografinių šaltinių. / In the Master thesis were investigated the change of the surface and mechanical properties during flexo printing with different ink thickness. 6 papers coated and uncoated grades were tested. Following properties were investigated: colour properties, tension strength and elongation, folding strength, PPS roughness and friction properties. It was found that flexographic ink increases paper PPS roughness, tensile strength and folding resistance is higher in the machine direction in all cases, tensile strength does not depend on the ink thickness and folding resistance becomes smaller. Master thesis includes 6 chapters: introduction, publications review, experimental methods, results and discussion, conclusions and recommendations, references. Master thesis consists of 83 p. (without appendixes), 82 fig., 1 table, and 28 references.