Specifies a bending vibration method for determing the damping properties and complex modulus of homogenous and laminated plastics especially intended for acoustical insulation. The test is performed on bars or stoilps which are either vertically arranged, one end being clamped, or are supported horizontally by thin threads in two vibration nodes. The specien is submitted to forced vibrations in a freqency range between about 100 and 1000 Hz. From the resonance curve the storage modulus and the loss factor shall be calculated.
Số hiệu tiêu chuẩn
ISO 6721
Tên tiêu chuẩn
Plastics; Determination of damping properties and complex modulus by bending vibration
Ngày phát hành
1983-09-00
Tiêu chuẩn tương đương
BS 4618-5.4 (1972-09-15), NEQ * NF T51-117 (1984-10-01), IDT
Thay thế bằng
ISO 6721-1 (1994-11) * ISO 6721-3 (1994-11) * ISO 6721-4 (1994-11) * ISO 6721-7 (1996-06) * ISO 6721-10 (1997-08)
Từ khóa
Determination * Mechanical properties * Plastics * Properties * Test specimens * Testing * Tests * Vibration * Damping capacity