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Research Phase of Material Testing
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The purpose of material testing is to compare the performance of the adhesives produced from our manufacturing ability to the provided technical data sheets. This allows us to have a more realistic understanding of the strength of the adhesive and the quantity of adhesive spent to bond parts together.
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In terms of the adhesive, EA E-120HP has been chosen, there were examined to have two properties and their standards that were viable for material testing. The first property was the tensile strength (ISO 527-3) for the properties of the cured material. Literature on the testing standard was found, but this test involved manufacturing an adhesive film sample which seemed difficult and irrelevant to our application. The second property was the lap shear strength (ISO 4587) for the performance of the cured material. Literature could not be found on this testing standard and therefore research on an ASTM equivalent (D1002) and generic adhesive overlap shear strength test was found.
Plan for Adhesive Material Testing
will probably need to make a test jig hmmm
[To be researched]
Adhesive Assembly Plan
Will need to design jigs and clamps to apply adhesive and parts together while curing.
The material testing will feature a single lap shear strength test which is a common and economic for testing overlap shear strength. This test is heavily similar to ISO 4587 (used in the TDS) and D1002 (the ASTM equivalent)
Table #1: Material, Curing Process, and Lap Shear Strength given from EA E-120HP Technical Data Sheet
Material | Curing Process | Lap Shear Strength (MPa) |
Aluminum (acid etched) | Cured for 2 hrs at 65 deg C | 13.7 |
Steel (grit blasted) | Cured for 12 hours @ 65 deg C | 30 |
Aluminum (acid etched & abraded), 0.1 to 0.2 mm gap | 33 | |
Aluminum (anodised) | 14 | |
Stainless steel | 23 | |
Polycarbonate | 6.9 | |
Nylon | 2.3 | |
Wood (Fir) | 11.3 |
Single Lap Shear Test: (D1002, ISO 4587)
Specimen Preparation:
Two rectangular sections that are 25 mm wide, 100 mm long and 1.6 mm thick
An overlap length of 25 mm.
Fixture is used to ensure correct overlap and accurate alignment of the adherend.
Equipment:
Testing can be conducted using standard tension/compression mechanical test equipment
Should ask the university about the use of a universal testing machine (UTM) which is used to test tensile strength and compressive strength of materials.
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