KS B ISO 18437-4:2014 Mechanical vibration and shock — Characterization of the dynamic mechanical properties of visco-elastic materials — Part 4: Dynamic stiffness method
This standard specifies the complex dynamic elastic moduli (Young's modulus, shear and bulk moduli, and loss coefficients for their tensile, shear and compressive deformations respectively) of polymeric materials (such as rubber, viscous polymers and rigid plastics) over a wide frequency and temperature range. This is a method for calculating , and the direct measurement is dynamic stiffness using signals from sensors attached to the specimen. The signals from these sensors are proportional to the dynamic force acting on the specimen and the strain rate of the specimen caused by that force. The range of measurement frequency depends on the size of the specimen, the accuracy required for dynamic elastic modulus measurement, the stiffness of the vibrator, and the specimen stiffness. relationship between the two and the resonance characteristics of the specimen fixture used. The methods described in this standard can be applied under any static preload applied to the specimen (including specimens with nonlinear properties that vary with static load), but It is used under small dynamic (acoustic) strains where the linearity of is not distorted. Although preload dependent, the dynamic elastic modulus relationship is unique.?
KS B ISO 18437-4:2014 history
2019KS B ISO 18437-4:2019 Mechanical vibration and shock — Characterization of the dynamic mechanical properties of visco-elastic materials — Part 4: Dynamic stiffness method
2014KS B ISO 18437-4:2014 Mechanical vibration and shock — Characterization of the dynamic mechanical properties of visco-elastic materials — Part 4: Dynamic stiffness method