Design Laboratory Equipment

There are two geared wheels; one wheel carries a big axle round which a string is wound to lift a load W. The second geared wheel (upper one) carries a pulley which a string is wound to carry the effort P.

Suppose the first geared wheel (with axle) has N1 teeth and the second geared wheel (with pulley) is given n revolutions the first geared wheel will take : n(N1/N2 ) revolutions. In that case distance moved by the effort is n x Circumference of the effort pulley and the distance moved by the load is: n(N1/N2) x circumference of the excel of first wheel.

Photoelasticity is an experimental method to determine the stress distribution in a material. The method is mostly used in cases where mathematical methods become quite cumbersome. Unlike the analytical methods of stress determination, photoelasticity gives a fairly accurate picture of stress distribution, even around abrupt discontinuities in materials. The method is an important tool for determining critical stress points in a material, and is used for determining stress concentration in irregular geometries.
The method is based on the property of birefringence, as exhibited by certain transparent materials. Birefringence is the phenomenon in which a ray of light passing through a birefringent material experiences two refractive indices. The property of birefringence (or double refraction) is observed in many optical crystals. Upon the application of stresses, photoelastic materials exhibit the property of birefringence, and the magnitude of the refractive indices at each point in the material is directly related to the state of stresses at that point. Information such as maximum shear stress and its orientation are available by analyzing the birefringence with an instrument called a polariscope.
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