3. Qualification of corner joints
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This is done by means of mechanical tests. It primarily concerns leaf assemblies that are fastened to one of their vertical edges. Three types of properties are currently estimated:
the torque to obtain 1˚ angular variation around the nominal position of 90˚ ;
the residual deformation at the end of this measurement;
the breaking couple.
The method is as follows:
The sample comprises ten leaf frames. They are cut roughly in the middle of their four sides and marked.
After conditioning at 20 ˚C and 65% relative humidity, they are divided into four batches of ten test tubes:
low-iron assemblies ;
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Qualification of corner joints
Corner joint technology
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