Beam Deflection and Strain Concentration (week 10)

Beam Deflection and Strain Concentration (week 10) - Beam...

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Beam Deflection and Strain Concentration Alex Fidalgo Stevens Institute of Technology 11/10/10 Design Laboratory III E-231 Section J Group 2 I pledge my honor that I have abided by the Stevens Honor System._______________________ Objective: The objective of this experiment was to determine the shear force (total load) from strain measurements taken along a loaded beam, verify the linearity of strain along the beam’s axis, and confirm the shear force and moment relationships by comparing two different stress determinations. Other objectives of this experiment was to demonstrate the existence of stress and strain concentration in the vicinity of a geometric discontinuity (i.e. a hole) in a cantilever beam and determine the stress concentration factor K t . Procedure: Part A 1. The caliper was used to measure the width(b) and thickness(h) of the uniform beam. 2. The micrometer was raised, and the beam was clamped into the Flexor. The micrometer was lowered so it contacted the beam. 3. The caliper was used to measure and record the distance from the point of load application to each strain gage. 4. The red wires were connected from the beam to Flexor binding post 5 and 6. 5. The signal wires from gages 1, 2 and 3 were connected to binding posts 1, 2, and 3 respectively. 6. Wires 5 and 6 were connected from the Flexor cable to any of the INPUT posts on the signal-conditioning unit.
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7. Wire 1 was connected from the Flexor cable to the other INPUT post on the signal conditioning unit. 8. The OUTPUT posts of the signal-conditioning box were connected to the multimeter terminals set to 2 volts DC. 9. The signal-conditioning unit was connected to the 120V AC-power outlet. 10. The multimeter was turned on, followed by the signal-conditioning unit.
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