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Adhesion: Bonds and Forces

E3 Teacher Summer Research Program. Texas A&M University. Adhesion: Bonds and Forces. Jose Treviño David Leppo. Motivation. Why are adhesives important? Important part of everyday items and cutting edge technology. Allows for objects to be bonded without damaging them.

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Adhesion: Bonds and Forces

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  1. E3 Teacher Summer Research Program Texas A&M University Adhesion: Bonds and Forces Jose Treviño David Leppo

  2. Motivation Why are adhesives important? Important part of everyday items and cutting edge technology. Allows for objects to be bonded without damaging them. What are some common applications?

  3. Applications Flexible Displays Oil Filters Oil Filters Flexible Solar Panels Coated Containers Everyday Electronics Aluminum Siding Automotive Electronics

  4. Tension Shear Adhesive Homogeneous Heterogeneous What properties are the focus of project?

  5. Shear / Tensile Test in the Lab Applies Tensile or Shear Stress Depends on the orientation of the material

  6. Simple Adhesive Test for the Class How do we test adhesive strengths? Measure maximum shear force Measure maximum tensile force Determine catastrophic failure point Presents need for two simple test rigs How do we capture attention of students?

  7. Crazy Scenarios • Stilt House • Build house on stilts • Use adhesives to bond materials • Flood region: impact on adhesive • Mars Bridge • Use adhesive to build bridges • Low supplies on Mars

  8. Crazy Scenarios • Adhesive to hold protective foam on space shuttle • Need strong, non-corrosive adhesive • Use least amount possible • How will you test its strength? • Suspended Underwater Platform • Buoyancy • Waterproof adhesive • Water pressure

  9. Conceptual Shear Test Rig Measure the failure limit of shear forces on adhesion. Measure the cross sectional area of adhesion. Load Adhesion

  10. Shear Force Test Rig

  11. Data Collection (Shear) Comparing force at failure point and cross sectional area.

  12. Max Shear Force vs Area

  13. TAKS Objectives: Mathematics 9-11 • Obj. 3: The student will demonstrate an understanding of linear functions. • Obj. 8: The student will demonstrate an understanding of the concepts and uses of measurement and similarity. • Obj. 10: The student will demonstrate an understanding of the mathematical processes and tools used in problem solving.

  14. Conceptual Tensile Test Rig Measure the failure limit of tensile forces on adhesion. Measure the cross sectional area of adhesion. Load Adhesion

  15. Load Magnets Alternative Tensile Test - Magnets • Use magnets instead of adhesion • Faster testing • Cleaner • Better Results

  16. Test Rig for Tensile Test (Magnets)

  17. Data Collection (Normal) Comparing force at failure point and cross sectional area.

  18. Max Tensile Force vs. Area

  19. Force vs Cross-Sectional Area Large cross-sectional area means more bonds to break. The larger the cross-section, the larger the force required to cause failure.

  20. Results Bonds should have constant strength regardless of cross-sectional area. Imperfections and non-uniformities in a material can cause deviations in the measured values of strength What kind of relationship exists between max force and area? Why is it important to know linear relationships exist?

  21. Cost of Materials

  22. QUESTIONS

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