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s its own way of. any ski on this point.
What is the stiffness distribution of a ski?
The stiffness distribution is the graph of the bending or torsion stiffness at any point on a ski. Here are some definitions to make it clearer:
The flexural stiffness How hard is it to bending a ski Symbol: El, measured in Nm2
Flexion of a ski (Source: Sooth Ski)
Torsional stiffine Symbol: GJ, measured in Nm
Torsion of a ski (Source: Sooth Ski)
Deformation
Why are we interested in the stiffness distribution ?
enough to Ic look at the average stiffness
How is the stiffness distribution measured?
To measure the distribution of stiffness in flexion of a ski, we apply a known force to the ski and we measure the deformation of the ski at any point.To measure the torsional stiffness distribution of a ski, a known torque is applied to the ski and the torsional deformation angle of the ski is measured at any point. A research group from the University of Sherbrooke supervised by Alexis Lussier-Desbiens has developed a machine that can measure these 2 parameters as well as the geometry and the camber of the ski in less than 2 minutes.Now operated by Sooth Skithis technology is the one that Ferreol uses to measure the mechanical properties of its skis
Case study: T. he Explo 96
Our design process allows us to reduce the number of prototypes necessary to arrive at the final concept.After drawing the geometry of a new prototype and making a first scale model, we choose the different materials and their configuration to obtain the desired flexural and torsional stiffness. Finally, we build a first prototype in our Beaupre facility to test it on the slopes of Mont-Sainte-Anne. Snow testing is the last step in the design cycle. It is at this stage that we must put aside the engineering and rely on the experience and evaluation of our testers. If the ski behaves as expected, the design is complete If not, adjustments will be necessary
In the case of the Explo 96,our testers indicated that the ski was aqile and easy to control, but that it would benefit from being more spirited and stable in bumps or variable terrain.So our designers decided to increase the front end stiffness (tip) of the ski to address this issue. The figure below shows the stiffness distributions of an early prototype of the Explo 96 (orange) and the final version (blue).
By increasing the front stiffness (tip) allows the skier to have a more aggressive stance (more weight forward) and increases the stability of the ski in bumps and variable terrain.However, by keeping a lower stiffness at the back (tai/) weallows the skier to exit the turn at any time and initiate a skillful skid to quickly control speed and direction The result? A spirited and agile ski that will perform just as well in tight glades as it will on firm snow. In short, if our designers had only looked at the average stiffness, it would have been impossible to do this analysis and optimize the behavior of the Explo 96.This is why measuring stiffness distributions is an important toolin our design proCeSS.
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