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Adhesive test results are based on material testing procedures outlined here:
Material Testing for Adhesives
Load rate used for Universal Testing Machine (UTM) was 0.5 mm/min.
Summary / Conclusions
Adhesive testing has found that surface preparation techniques have a profound effect on the adhesive’s strength. Degreasing provides a 46.55% stronger bond than using no surface preparation technique. Abrasion provides a 64.78% stronger bond than using no surface preparation technique.
Adhesive testing has also found that thorough and proper preparation of adhesive joints greatly influences whether it will result in utter failure or a superior bond.
Visual examination found that specimens with an excess amount of adhesives applied to it corresponded with specimens with better performance.
Raw Data
Refer to the file “Adhesive Testing Data.xls” for the raw data outputted from the Universal Testing Machine
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Specimen | Max Shear Stress (MPa) | Comments |
|---|---|---|
None 1 | 3.227076 | Suspicion of poor specimen preparation |
None 2 | 15.00324693 | |
None 3 | 3.51152 | Suspicion of poor specimen preparation |
Degrease 1 | 7.364299 | |
Degrease 2 | 1.401875 | Suspicion of poor specimen preparation |
Degrease 3 | 3.46305 | |
Abrade 1 | 5.961373 | |
Abrade 2 | 4.618917913 | |
Abrade 3 | 9.213191 |
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Surface Preparation | Average Max Shear Stress (MPa) |
|---|---|
None | 7.247280977 |
Degrease | 4.076408 |
Abrasion | 6.597827304 |
Table #3: Modified average max shear stress of each surface preparation technique excluding anomalies
Surface Preparation | Average Max Shear Stress (MPa) | Samples Included |
|---|---|---|
None | 3.369298 | None 1, None 3 |
Degrease | 5.4136745 | Degrease 1, Degrease 3 |
Abrasion | 6.597827304 | Abrade 1, Abrade 2, Abrade 3 |
Table #4: Percentage difference of surface preparation techniques compared to none based on Table #3 calculations
Surface Preparation | Percentage Difference (%) |
|---|---|
Degrease | 46.55318003 |
Abrasion | 64.78356007 |
Graphs of Single Lap Shear Test:
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