METHOD FOR SELECTING AN INTERCALAR FOR A VIBRO-ACOUSTIC DAMPER, INTERCALAR FOR A VIBRO-ACOUSTIC DAMPER AND GLAZING COMPRISING SUCH AN INTERCALAR

摘要

The invention relates to a method for selecting a viscoelastic plastic interlayer comprising two outer layers and a central layer and intended to be incorporated between two glass sheets of a glazing unit, the method comprising the following steps: - first and second second elements intended to constitute respectively the central layer and the outer layers, - the shear modulus G 'of the first and second elements is measured, - the material of the second element is selected only if G' ≥ 3.10 Pa at 20 ° C and between 100 Hz and 240 Hz, the thickness h of the first element is fixed such that h ≤ 0.3 mm and g = G '/ h is between 8.10 Pa / m and 2.67 × 10 Pa / m at 20 ° C. and between 100 Hz and 240 Hz. The invention makes it possible to optimize the damping of the second and third natural frequencies of a vehicle windshield without making the windshield heavier.