ISO 18437-4:2008 PDF

Scope: This part of ISO 18437 specifies a direct method for measuring the complex dynamic moduli of elasticity (the Young, shear and bulk moduli, and their respective loss factors corresponding to the tensile, shear and all compressive strains) for polymeric (rubbery and viscous polymers, as well as rigid plastics) materials over a wide frequency and temperature range. Measurements are performed by the dynamic stiffness method, which uses electric signals from sensors attached to a test piece. These signals are proportional to the dynamic forces acting on the test piece and the strains in the test piece due to the effect of these forces. The measurement frequency range is determined by the size of test piece, the accuracy required on the dynamic modulus measurements, the relationship between the stiffness of the oscillation generator and the stiffness of the test piece, and by the resonance characteristics of the test fixture used. The method presented in this part of ISO 18437 allows measurement under any static pre-load allowed for the test piece (including the test piece having the non-linear characteristics under different static loads), but under small dynamic (acoustic) strains, i.e., in limits where the linear properties of the test piece are not distorted. Depending on the pre-load conditions, the relation between the moduli is unique.

ISO 18437-4:2008 Referenced Document

ISO 10112 Damping materials; graphical presentation of the complex modulus
ISO 10846-1 Acoustics and vibration - Laboratory measurement of vibro-acoustic transfer properties of resilient elements - Part 1: Principles and guidelines*， 2008-08-01 Update
ISO 2041 Mechanical vibration, shock and condition monitoring - Vocabulary*， 2018-10-01 Update
ISO 23529 Rubber - General procedures for preparing and conditioning test pieces for physical test methods*， 2016-11-01 Update
ISO 4664-1 Rubber, vulcanized or thermoplastic — Determination of dynamic properties — Part 1: General guidance*， 2022-07-01 Update
ISO 472 Plastics — Vocabulary — Amendment 1: Additional items*， 2018-10-31 Update
ISO 483 Plastics - Small enclosures for conditioning and testing using aqueous solutions to maintain the humidity at a constant value
ISO 6721-1 Plastics — Determination of dynamic mechanical properties — Part 1: General principles*， 2019-04-29 Update
ISO 6721-4 Plastics — Determination of dynamic mechanical properties — Part 4: Tensile vibration — Non-resonance method*， 2019-05-02 Update
ISO 6721-6 Plastics — Determination of dynamic mechanical properties — Part 6: Shear vibration — Non-resonance method*， 2019-04-17 Update

2008 ISO 18437-4:2008 Mechanical vibration and shock - Characterization of the dynamic mechanical properties of visco-elastic materials - Part 4: Dynamic stiffness method