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Beam Bending Lab

Beam Bending Lab. ENGR 1181 Lab # 6. Today's Learning Objectives. Students will gain experience creating force through applied loads and measuring the deflection of a cantilever beam using a dial caliper.

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Beam Bending Lab

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  1. Beam Bending Lab ENGR 1181 Lab # 6

  2. Today's Learning Objectives • Students will gain experience creating force through applied loads and measuring the deflection of a cantilever beam using a dial caliper. • Through hands-on experiments and calculations, students will become familiar calculations for and concepts regarding: • Stress • Strain • Young’s Modulus of Elasticity • Moment of Inertia

  3. Beam Bending Lab Apparatus

  4. Dial Indicator: Overview • This dial indicator is unloaded, and shows a reading of 0.989”, or -0.011” (yours will be close). It is negative because the plunger is not engaged. • There is a locking screw in the upper right that should stay tightened. • The bezel (front adjustable ring) should not be moved. The black marker must always ling up with the plunger.

  5. Dial Indicator: Set-Up • When the beam is placed against the plunger (needle at bottom of picture), the dial should move and is then “engaged”. • Your “zero weight” reading will not be exactly zero. • It is a starting point for all other measurements to be compared.

  6. Dial Indicator: Class Activity What are these readings? 0.119” 0.282”

  7. Beam Bending Lab Tasks • Your team of 4 is responsible for completing one lab memo. • During this lab, each group will divide into two groups of 2 to work more closely with the beam bending apparatus. • Measure Deflection (y-axis) versus Force (x-axis) for: • Aluminum Rectangular Beam • Copper Rectangular Beam • Copper Square Beam • “Unknown” Rectangular Beam

  8. Typical Data and Results

  9. Tips for Successful Lab • Make sure the beams are securely fastened, but without over-tightening. • Use dial caliper properly and follow instructions. • Make sure bezel is properly aligned. • Check numbers put in excel worksheet. Do they make sense?

  10. Important Takeaways • Learn how to properly use a dial caliper. • Understand the concept and formulas for stress, strain, Young’s Modulus, and Moment of Inertia. • Think about how material and shape configuration impacts design decisions. • Complete the group Lab Memo that includes Individual Recommendations & Conclusions– due in Lab 7B.

  11. Preview of Next Class • The next lab is a 3-part series involving Wind Turbines. • This will familiarize students with wind turbine design, efficiency calculations, power generation, and creative design. • Prepare for Lab 7A by reading the Wind Turbine Lab – Part A preparation material.

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