Department of Mechanical Engineering, UET Lahore (KSK-Campus).Lab Manual EXPERIMENT NO. 7 Objective: To find out the horizontal and vertical deflection of a Semi circular beam loaded by vertical load, using the Curved Bar Apparatus. Apparatus: Curved Bar Apparatus, Weight, Semi circular beam apparatus, Dial gauge, Vernier Caliper. Mechanics of Materials-II

Summary of Theory: Beams/ Types Curved bars / deflection of curved bars Derivation of formulae

Procedure: Adjust the Semi circular bar .Attach two dial gauges for finding vertical as well as horizontal deflection, load the bar for no. of times by an equal amount of 1N each time and note the corresponding readings from dial gauges attached to the apparatus, for vertical and horizontal deflection. Multiply those observations with the least count of the dial gauges and note out the final deflections i.e. &v and &h. Graph: On graph plot the deflection against load for horizontal & vertical deflection for the theoretical & practical results. Draw the best fit straight lines through the points.

Observations & Calculations: Radius of curved bar = R = Width of the bar = b = Thickness of the bar = d = Modulus of Elasticity = E= Moment of Inertia= I=

Department of Mechanical Engineering, UET Lahore (KSK-Campus).

Sr. No.

LOAD

W (N)

Dial Gauge Reading

Experimental Deflection (mm)

Theoretical Deflection (mm)

H1 2 3 4 5 6 7 8 9 10

V

H

V

H=3

V==

7WR /4EI WR3/2EI

Name: _________________________ Date: Report:

Reg. # 2008-ME-_________

The laboratory report should contain the following: 1. Plot of curve between Load and Deflection as shown above. 2. Hand calculations showing all results under procedure above. 3. Derivation of formulae. 4. A discussion / comments of factors affecting the results of the experiment. 5. Practical Applications