By D. Yogi Goswami
This moment version of the CRC guide of Mechanical Engineering covers each very important element of the topic in a single unmarried quantity. It offers a reference for the practising engineer in undefined, executive, and academia, with proper historical past and updated info at the most crucial themes of contemporary mechanical engineering. those subject matters comprise smooth production and layout, robotics, machine engineering, environmental engineering, economics and undertaking administration, patent legislation, bioengineering, and verbal exchange and data platforms. the ultimate bankruptcy and appendix offer information about actual homes and mathematical and computational tools.
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Additional info for The CRC Handbook of Mechanical Engineering (2nd Edition) (Handbook Series for Mechanical Engineering)
Sample text
Distributed Forces The most common distributed forces acting on a body are parallel force systems, such as the force of gravity. These can be represented by one or more concentrated forces to facilitate the required analysis. Several basic cases of distributed forces are presented here. The important topic of stress analysis is covered in mechanics of materials. Center of Gravity The center of gravity of a body is the point where the equivalent resultant force caused by gravity is acting. fm Page 21 Thursday, August 5, 2004 10:16 AM 1-21 Mechanics of Solids where x, y, z are the coordinates of an element of weight dW, and W is the total weight of the body.
Positive answers indicate assumed directions of unknown forces were correct, and vice versa. 24 Method of sections in analyzing a truss. fm Page 20 Thursday, August 5, 2004 10:16 AM 1-20 Chapter 1 Space Trusses A space truss can be analyzed with the method of joints or with the method of sections. For each joint, there are three scalar equilibrium equations, ΣFx = 0, ΣFy = 0, and ΣFz = 0. The analysis must begin at a joint at least one force is known and no more than three forces are unknown. The solution must progress to other joints in a similar fashion.
30) where s = displacement of a body in the direction of the vector F. For a displacement along an arbitrary path from point 1 to 2, with dr tangent to the path, U= ∫ 2 1 F ⋅ dr = ∫ (F dx + F dy + F dz) 2 1 x y In theory, there is no work when: • A force is acting on a fixed, rigid body (dr = 0, dU = 0). • A force acts perpendicular to the displacement (F · dr = 0). 31) where θ = angular displacement (radians) in the same plane in which the couple is acting. In a rotation from angular position α to β, U= β β α α ∫ M ⋅ dθ = ∫ ( M x d θ x + M y dθ y + M z d θ z ) Virtual Work The concept of virtual work (through imaginary, infinitesimal displacements within the constraints of a system) is useful to analyze the equilibrium of complex systems.
