ISO 18437-1:2012

Overview

ISO 18437-1:2012 - Mechanical vibration and shock - Characterization of the dynamic mechanical properties of visco‑elastic materials - Part 1: Principles and guidelines - defines the fundamental principles for laboratory determination of the dynamic mechanical properties (elastic modulus, shear modulus, bulk modulus, loss factor and Poisson ratio) of isotropic visco‑elastic resilient materials used in vibration isolators. It explains the measurement concepts that underpin Parts 2–5 (resonance, cantilever shear beam, dynamic stiffness and Poisson‑ratio methods), and helps users select the appropriate test method for design, development and quality control.

Key topics and requirements

• Scope and applicability: Applies to isotropic resilient materials used in vibration isolators to reduce vibration, shock and noise transmission (including audio and low‑frequency vibration affecting humans, structures or sensitive equipment).
• Measured properties: Complex Young’s modulus (E* = E′ + iE″), loss factor (tan δ), shear and bulk moduli, and Poisson ratio.
• Measurement principles: Overview of three mechanical test approaches:
  • Resonance method - transmissibility of a bar specimen between driver and mass (typical specimen ~100 mm long; equipment: electrodynamic driver, accelerometers, FFT analyser).
  • Cantilever shear beam method - driven flexural response of a clamped beam (force and displacement measurement).
  • Dynamic stiffness method - input force vs. displacement/velocity measurement of a resilient element.
• Conditions for valid results: Linear vibrational behaviour at small strain amplitudes, uniform interface distribution, and negligible fluid–structure interaction (note: open‑cell foams can show air–solid coupling at higher frequencies).
• Supporting topics: specimen conditioning, time–temperature superposition, linearity checks and guidance for selecting the appropriate part of ISO 18437 for specific frequency, temperature and preload ranges.
• Typical test equipment: electro‑dynamic drivers, force sensors, displacement or acceleration transducers, environmental chambers, dual‑channel spectrum analysers and data acquisition systems.

Applications and users

ISO 18437-1 is used by:

• R&D and acoustics engineers designing vibration isolators, mounts and resilient supports.
• Test laboratories performing dynamic mechanical analysis of rubber, elastomers and other visco‑elastic materials.
• Manufacturers and material suppliers providing product data and quality control certificates.
• Structural and mechanical engineers performing theoretical vibration transfer and finite‑element modelling where accurate material dynamic properties (including Poisson ratio) are required.

Practical outcomes include optimized material selection, validated isolator design, improved noise and shock mitigation, and consistent product data for procurement and compliance.

Related standards

• ISO 18437-2 to ISO 18437-5 (specific methods)
• ISO 6721-1, ISO 4664-1 (dynamic mechanical testing principles)
• ISO 10846-2 (dynamic stiffness of resilient supports)
• ISO 23529, ISO 472, ISO 2041 (specimen conditioning and vocabularies)

Keywords: ISO 18437-1, visco‑elastic materials, dynamic mechanical properties, loss factor, elastic modulus, vibration isolators, resonance method, cantilever shear beam, dynamic stiffness.