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Lab #1 Report due TODAY

Lab #1 Report due TODAY. Individual Data Processing and Individual Write Up Lab #1 Report is due TODAY by midnight Answer Multiple Choice Questions ONLINE TODAY by midnight Answer Student Survey ONLINE TODAY by midnight

uriah-wright
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Lab #1 Report due TODAY

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  1. Lab #1 Report due TODAY • Individual Data Processing and Individual Write Up • Lab #1 Report is due TODAY by midnight • Answer Multiple Choice Questions ONLINE TODAY by midnight • Answer Student Survey ONLINE TODAY by midnight • Submit the Lab Report #1 in the drawer labeled “MECE204 - Strength Lab” under Mech. Engg. Mail Folders

  2. Tensile Testing: Objectives • Learn elastic and plastic behavior of metallic materials in monotonic tension • Learn the use of Tinius Olsen 120 kips UTS and clip-on extensometer • Conduct tensile testing experiment on 1018 steel and 2024 aluminum alloy • Determine quantitatively elastic and tensile mechanical properties • Determine qualitatively the material’s failure mode • Become familiar with ASTM E-8 Standard • Submit a professional lab report with abstract, data, graphs, and discussion • Answer multiple-choice questions and student survey ONLINE using MyCourses

  3. Tensile Properties • Quantitative determination of • Elastic Modulus, E • Proportional Limit, PL • 0.2% Offset Yield Strength, Y • Tensile Strength, TS • % Elongation to Failure, %f • Modulus of Toughness, Atotal • Qualitative study of Failure

  4. P P B r P F B Stress and Strain (a) Tension-Test Specimen (b) Cross-Section at B Figure 1.1 Tension-test Specimen (a) Axially Loaded and (b) Cross-Section at B

  5. s , psi su sf sy Plastic Region Yield Region Elastic Region e , in/in Engineering Stress-Strain Curve Non-uniform Plastic Deformation Uniform Plastic Deformation Elastic Deformation Figure 1.3 Stress-Strain Diagram, Labeled

  6. Actual Experimentation

  7. 0.2% Offset Yield Strength

  8. Modulus of ResilienceModulus of Toughness

  9. Necking begins at maxima

  10. Shape of Necked Region

  11. Engineering vs. True Stress-Strain Engineering Stress = e = P / A0 True Stress = t = P / Ai Engineering Strain = e =  / L0 = (Li – L0) / L0 implies Li = L0 * (1 + e) Assume volume is constant until necking: A0*L0 = Ai*Li  Ai = A0/(1+e) True Stress = t = P / Ai = P (1 + e) / A0 = e (1 + e) True Strain = t =  (dL)/L = Ln(Li / L0) = Ln (1 + e)

  12. Comparison

  13. Ductile vs. Brittle Failure

  14. Fracture Surfaces

  15. Testing Equipment • Universal Testing Machine (UTM) • Tension, Compression and Flexure • Monotonic Static Tension Test • Single direction, Load increased slowly • Crosshead Motion • Motor-driven Screw • Hydraulically-driven Crosshead • ASTM Standards: E8

  16. Testing Methods • Displacement Control • Open loop, Most Common • Load Control • Close Loop Feedback, Expensive • Strain Control • Close Loop Feedback, Expensive

  17. Data Sheet

  18. Data Sheet (continued)

  19. Demonstration Perform the tensile testing experiment on 1018 Cold Rolled Steel

  20. Data Sheet (continued)

  21. Lab #1 Report due TODAY • Individual Data Processing and Individual Write Up • Lab #1 Report is due TODAY by midnight • Answer Multiple Choice Questions ONLINE TODAY by midnight • Answer Student Survey ONLINE TODAY by midnight • Submit the Lab Report #1 in the drawer labeled “MECE204 - Strength Lab” under Mech. Engg. Mail Folders

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