User:Alicia Rasines Mazo/Notebook/CHEM-582 Experimental Chemistry II/2015/04/03

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Tasks for April 3

  • To finish adhesive test

Adhesive strength test on epoxy samples

  • Placed weight at a distance of 9.5 cm from adhesion site

In the previous lab session weights were placed at different distances from adhesion site for weights if 1-10 lb. The nail only dislodges at the furthest site (i.e. 9.5 cm away from adhesion site). Nail one broke after applying 8lb.

  • Nail 2: Applied 1,2,3...,9 lb for 2 min each
    • The adhesive broke after 4.85 s with weight of 10 lb.
  • τ=rsinθ
  • τ=(0.095 m)(4.535 kg)(9.8 N/kg)=
  • Nail 3: 1,2,3,4,5,6 lb each for 2 min
    • The adhesive broke after 2.5 s at 7 lb.
  • Nail 4: 1,2,3,4,5 lb each applied for 2 min
    • The adhesive broke after 18 s at 6 lb.