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sisvu:academicYear 2008 (xsd:int)
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sisvu:description Objectives of a course is to prepare students to be able to handle all those engineering problems dealing with fracture and fatigue. During this course students will enhance their understanding of basic concepts and increase their ability to solve a lot of different engineering problems of an interdisciplinary nature Strain gages in deformation measurements, types of strain-gages, working principle, connection of gages (Wheatstone bridge). Strain gages rosette, principal strain and stress calculation for two-dimensional problems Time varying measurements, data acquisition and reduction. Mesurements in situ. Design of sensors for measurement of different physical quantities (force, torque, pressure, acceleration) based on strain gages. Mid-term exam Photoelasticity, photoelastic model in polariscope, isoclinic and isochromes determination, compensation Construction of stress trajectories, separation of principal stresses (numerically and experimentally) Model similarity in stress measurements Movement, velocity and acceleration measurement, the principle of piezoelectric, inductive and capacitance sensors. Vibrations measurements, sensors, data acquisition and reduction. Signal analysis Modal analysis. Determination of structural damping. Fast Fourier transformation (FTT). Measuring signal presentation. Other measurements in mechanics: measurement of body geometry with 3D scanner, moment of inertia measurement. Residual stress measurement, determination of fractomechanical characteristics of materials. Final exam (en)
sisvu:description Uvod u eksperimentalnu mehaniku. Principi mjerenja u mehanici krutih i deformabilnih tijela. Mjerenje deformacija elektrootporničkim tenzometrima, vrste tenzometara, princip rada, spajanje tenzometara (Wheatstoneov most). Tenzometrijske rozete, proračun glavnih deformacija i naprezanja kod dvoosnog stanja naprezanja. Dinamička mjerenja, prikupljanje podataka mjerenja i njihova analiza uz pomoć računala. Mjerenje naprezanja na konstrukcijama u pogonu. Osjetnici za mjerenje drugih mehaničkih veličina (sila, momenata, tlaka, ubrzanja) bazirani na tenzometrima. Prvi kolokvij iz eksperimentalne mehanike Metoda fotoelasticimetrije, ponašanje fotoelastičnog modela u polariskopu, određivanje izoklina i izokroma, metode kompenzacije. Konstrukcija trajektorija naprezanja, separacija glavnih naprezanja (numerički i eksperimentalno). Modelska sličnost kod mjerenja naprezanja. Mjerenje pomaka, brzina i ubrzanja: vrste osjetnika, princip rada piezoelektričnih, induktivnih i kapacitivnih osjetnika. Mjerenje vibracija, osjetnici za mjerenje vibracija, prikupljanje, obrada i analiza signala mjerenja. Modalna analiza. Određivanje prigušenja sistema. Brza Fourierova transformacija (FTT). Prikaz rezultata mjerenja. Ostala mjerenja u mehanici: mjerenje geometrije tijela pomoću 3D scanera, mjerenje momenata tromosti. Mjerenje zaostalih naprezanja, određivanje fraktomehaničkih karakteristika materijala Drugi kolokvij iz eksperimentalne mehanike (hr)
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