OBJECTIVETo measure the height of the block Rotate to

OBJECTIVETo find shear stress, shear strain and shear modulus of a rubber blockAPPARATUS Cussons Rubber Block Apparatus Vernier Callipers Dial Indicator Measuring Tape Weights Weight HangerTHEORYShear StressA shear stress, often denoted ?, is the component of stress coplanar with a material cross section. Shear stress arises from the force vector component parallel to the cross section.The expression that gives the value of shear stress is as follows:?=F/Awhere?=Shear StressF=Force AppliedA=Area of Cross Section Parallel to Force.Shear StrainShear strain is the ratio of the change in deformation to its original length perpendicular to the axes of the member due to shear stressThe expression that gives the value of shear strain is as follows?=?l/lwhere?=Shear Strain?l=Change in Lengthl=Original Length.Shear ModulusIn materials science, shear modulus or modulus of rigidity, denoted by G, is defined as the ratio of shear stress to the shear strain.Formula to calculate shar modulus is given asG=?/?Dial Indicator & its usesA dial test indicator, also known as a lever arm test indicator or finger indicator, is a small range dial indicator. A test indicator measures the deflection of the arm, the probe does not retract but swings in an arc around its hinge point.The purpose of a dial indicator is to measure changes in dimensions not visible to the human eyes. The angular deflection in the lever arm is correlated to a linear change in dimension.The dial indicator used in this experiment has a least count of 0.01 mmPROCEDURE Measure the thickness of the rubber block Use measuring tape to measure the height of the block Rotate to screw to position the pointer the value of zero. Add 0.5 kg to the hanger and note the value on the gauge. Keep adding 0.5 kg until total of 2.5 kg have been loaded. Note the gauge reading after every addition of 0.5 kg Start unloading the mass by removing 0.5 kg and noting down the gage reading, until there is no mass supportedCalculate the average of loading and unloading values.


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