The Instron 3342 universal testing machine is a versatile low-load tensile tester that ACG has used extensively for characterisation of both fibre strength/strength distribution and of interfacial strength between fibres and polymers. It has a maximum load capacity of 0.5 kN or a smaller load cell of 10 N. Interfacial strength testing is achieved using a specially designed microbond testing rig, manufactured in-house.
Microbond interfacial test
The inset picture shows the experimental set up of the microbond test, used to measure interfacial shear strength between a fibre and polymer droplet. A stereo microscope and micrometers are used to position the shear blades close to the fibre, just above the polymer droplet. The testing machine pulls the microbond sample with the fibre and polymer droplet up and the force to separate the fibre from the droplet is recorded until debond occurs.
The Testometric M250-2.5CT is used by the ACG exclusively for testing of single reinforcement fibres and fibre bundles. It can be equipped with either a 2.5 kN or 5 N load cell. Both load cells are supplied with pneumatic grips allowing quick and easy changing of samples.
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No. 1 2014 most downloaded original research paper from Composites Part A