2. A close -coiled helical spring having 12 coils must absorb 200 joules of energy and support a load of 10 kN without the shear stress exceeding 220mPa. If G= 80 GPA determine the wire diameter and the mean coil diameter. [22mm,92mm]
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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![2. A close -coiled helical spring having 12 coils must absorb 200 joules of energy and support a
load of 10 kN without the shear stress exceeding 220mPa. If G= 80 GPA determine the wire
diameter and the mean coil diameter. [22mm,92mm]
3. a) In the composite spring shown, Spring 1 has a mean coil diameter of 36 mm. Determine the
wire diameter of spring 2 if it has a mean coil diameter of 24mm and the maximum shear stress
in the two springs is to be the same. [2.82mm]
WWWW
20.25N
Spring 2
Spring 1
b) If G=80 GPa and points A and B moved through 14mm and 19,94mm respectively determine:
i. the number of coils in each spring [12; 10]
ii. the effective stiffness of the composite spring / 1.02KN/m]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F448942be-30a8-4a16-8a0d-9a7c9f4daa9f%2Fafa2bdec-95a9-45cb-91ce-301c61e2706f%2Fax6qp8h_processed.jpeg&w=3840&q=75)
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