A theoretical calculation of the pressures on and the deformation of the beams is developed. In a first approximation the beam is assumed to be completely rigid and in a second approximation the elasticity of the barrel and flanges is taken into account.
The results, developed on several types of yarn and on beams of various shapes and forms, are compared with experimental data obtained during a series of tests by the I.D.I. of Turin, Italy, on beams during use.
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