A vertical load of 1500 lb is to be exerted to one end of a rotating 10-in. long aluminum beam attached to a wall at the opposite end (in a bending geometry). The bar must survive for at least 10 cycles. What is the minimum diameter of the bar? (Figure 1) 120 Tool steel 100,000 cycle fatigue life at 90,000 psi applied stress 100- Figure 1 80- Endurance limit = 60,000 psi 60 - 40- Aluminum alloy 20- 0. 104 105 106 107 108 Number of cycles Applied stress (ksi)
Theory and Design for Mechanical Measurements
Measurement is a term that refers to analyzing a manufactured component regarding the degree of accuracy for dimensions, tolerances, geometric profile, roundness, flatness, smoothness, etc. Measurement always involves comparing the manufactured component or the prototype with a standard specimen whose dimensions and other parameters are assumed to be perfect and do not undergo changes with respect to time.Precisely in mechanical engineering the branch that deals with the application of scientific principles for measurements is known as metrology. The domain of metrology in general deals with various measurements like mechanical, chemical, thermodynamic, physical, and biological measurements. In mechanical engineering, the measurements are limited to mechanical specific such as length, mass, surface profile, flatness, roundness, viscosity, heat transfer, etc.
Basic principles of engineering metrology
Metrology is described as the science of measurement, precision, and accuracy. In other words, it is a method of measurement based on units and predefined standards.
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