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Moment of inertia is the property of a deformable body that determines the moment needed to obtain a desired curvature about an axis. Moment of inertia depends on the shape of the body and may be different around different axes of rotation. Moment-curvature relation: E: Elasticity modulus (characterizes stiffness of the deformable body) : curvature
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The moment of inertia of an area about an axis is equal to the moment of inertia of the area about a parallel axis passing through the centroid plus the product of the area and the square of the perpendicular distance between the axes.
Center of Gravity and Moment of Inertia: First and second moment of area and mass, radius of gyration, parallel axis theorem, product of inertia, rotation of axes and principal M. I., Thin plates, M.I. by direct method (integration), composite bodies.
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Moment of inertia of a homogeneous body is obtained from double or triple integrations of the form. I. 2 = ρ ∫ r dV. For bodies with two planes of symmetry, the moment of inertia may be obtained from a single integration by choosing thin slabs perpendicular to the planes of symmetry for dm.
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Area moments of inertia are a measure of the distribution of a two-dimensional area around a particular axis. Fundamentally, the portions of a shape which are located farther from the axis are more important than the parts which are closer.
The most straightforward approach is to use the definitions of the moment of inertia (10.1.3) along with strips parallel to the designated axis, i.e. horizontal strips when you want to find the moment of inertia about the \(x\) axis and vertical strips for the moment of inertia about the \(y\) axis.
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Feb 5, 2024 · Introduction to engineering mechanics: statics, for those who love to learn. Concepts include: particles and rigid body equilibrium equations, distributed loads, shear and moment diagrams, trusses, method of joints and sections, & inertia.
