Watch: Friction testing on an osteochondral coreTissue testing · 3:46
Friction testing on an osteochondral core
A demonstration of friction testing on an osteochondral core.
Test configurations
Friction
Friction tests determine the ease of two surfaces to slide against each other when subjected to a contact force. Two main phenomenons are generally observed during these tests: static and kinetic friction. Static friction is the force preventing an object from moving from rest, while kinetic friction is the force acting between two surfaces when they are already in motion. Using the vertical stage to apply a normal force and the other stages to apply either rotational or translational movements, the software developed by Biomomentum allows you to easily determine the coefficient of friction and the forces involved in the tests. The purposes of friction testing cover a large field of interests. For example, testing the effectiveness of a new type of lubricant or comparing the surface properties of two samples.
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FAQ
How does the "Sinusoid" model works?
This feature is used to obtain the Frequency, Amplitude and Offset of a sinusoidal signal. A blue line displays the theoretical sinusoid with the Frequency, Amplitude and Offset obtained (Figure 1). The values of the Frequency, Amplitude and Offset are indicated in the "Results" field. The units vary according to the graph’s axes.
This feature can also be used for sinusoidal stimulus-response analysis. Sinusoidal stimulus shall be selected on the x-axis and the sinusoidal response on the y-axis. The Modulus is the ratio of the response Amplitude over the stimulus Amplitude. The Phase is the phase difference between the response and the stimulus. The Modulus’ is computed as the Modulus*Cos(Phase) and the Modulus” is computed as the Modulus*Sin(Phase). A blue line displays the theoretical sinusoidal stimulus-response with the Frequency, Modulus and Phase obtained (Figure 2). The values of the Modulus and Phase are indicated in the “Results” field. The units vary according to the graph’s axes.
One use for this feature would be to compute material properties by multiplying the Modulus obtained by the appropriate geometric factors. For example, the Young’s Modulus can be obtained during uniaxial compression or tension on cylindrical sample with t/pi*r2 as the geometric factor, t is the thickness and r is the radius of the sample.
Mach-1 Analysis – Sinusoid – Example for stimulus-response analysis