(EXAM 3) MAE 1351 – UTA QUESTIONS & ANSWERS 100% CORRECT!!

boundary conditions - ANSWER-The constraints and loads added to the boundaries of a finite element model. center-of-mass (centroid): - ANSWER-The origin of the coordinate axes for which the first moments are zero. constraint - ANSWER-A boundary condition applied to a finite element model to prevent it from moving through space. density - ANSWER-The mass per unit volume for a given material. displacement: - ANSWER-A change in the location of points on an object after it has been subjected to external loads Finite Element Analysis - ANSWER-An advanced computer based design analysis technique that involves subdividing an object into several small elements to determine stresses, displacements, pressure fields, thermal distributions, or electromagnetic fields. mechanical stress - ANSWER-Developed force applied per unit area that tries to deform an object. mesh - ANSWER-The series of elements and nodal points on a finite element model. moment-of-inertia - ANSWER-The measure of an object's ability to resist rotational acceleration about an axis radius-of-gyration - ANSWER-The distance from an axis where all of the mass can be concentrated and still produce the same moment-of-inertia. reverse engineering - ANSWER-: A systematic methodology for analyzing the design of an existing device. What are some of the mass properties that can be computed for a CAD model? - ANSWER-Density, Mass, Volume, Surface area, Center-of-mass or centroid, principle aces-of-inertia and principle moments-of0inertia, radius-of-gyration What is a moment-of-inertia? - ANSWER-IT IS A MEASURE OF THE BODY'S PROPERTY TO RESIST CHANGE IN ITS STEADY ROTATION ABOUT THE AXIS. IT DEPENDS ON THE BODY'S MASS AND ITS DISTRIBUTION AROUND THE AXIS Is it easier to spin a wheel with a large diameter or a small diameter? - ANSWER-a wheel with a large diameter will be harder to accelerate to a desired rotation rate than a wheel with a small diameter. so its easier to spin a wheel with a small diameter