Skip to content

Week 2

In this week I specified testing procedure and necessary tools for testing adhesive quality.

Bond strength test (tensile strength)

Tensile strength test is one of the common ways to test bonding strength of adhesives. Our goal is test maximum tensile strength which is the maximum strength divided per surface area (perpendicular to the tension force direction) that object (adhesive) can withstand before failure.

Suggested Tools

  • Clamp stand
  • Slotted weight
  • Digital weighing balance
  • MDF Specimens

Fab Lab focuses on designing necessary tools instead of purchasing them. Clamp stand and testing MDF specimens are designed in Fab Lab and printed using CNC machine.

Clamp Design

Clamp stand is used to hold testing specimens. Fusion 360 is used to design it.

Project sketches and save them in DXF format. DXF is 2D vector format. DXF files are sent to special software which converts them to gcode format. gcode format is what machine understand.

Cutting design using CNC machine

Final design

click here to download f3d

click here to download stl file

click here to download dxf base file

click here to download dxf pole file

click here to download dxf holder file

MDF specimens design

Tasting specimens are also designed in fusion 360. These specimens are attached together using casein adhesive.

Shapes are splitted after using offset plane and split body tools because, fusion had a software bug and saving dxf after projection was not possible.

click here to download f3d

click here to download stl file

click here to download dxf specimen 1 file

click here to download dxf specimen 2 file

Testing specimens on clamp stand

Water resistant test

In this test normal water from tap will be used. Distilled water won’t be needed since this testing procedure focuses on real case scenario.

Fire test

Lighter will be used to heat samples of adhesives to check if material is flammable.

Moisture test

If material is effected by water it is suggested to do moisture test. This test will be done in a room (i.e., bathroom) at different humidity levels (i.e., 0-20-50-80 %). Air humidifier and hygrometer will be used to take measurement.

Last update: August 8, 2021