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Engineering

Mechanical Engineering

B D

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter8: Computer Numerical Control

Section8.4: Cnc Turning: Setup And Operation

Problem 2RQ: MDI stands for _________ ___________ ________.

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Concept explainers

Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.

Question

A symmetrical framework consisting of three
pin-connected bars is loaded by a force P (see figure).
The angle between the inclined bars and the horizontal
is α = 52°. The axial strain in the middle bar is
measured as 0.036.
Determine the tensile stress in the outer bars if
they are constructed of a copper alloy having the following
stress-strain relationship:
σ = 18,000ε/(1 + 300ε) 0 ≤ ε ≤ 0.03 (σ= ksi)

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