ISO 18437-3:2005

Overview

ISO 18437-3:2005 specifies the cantilever shear beam method for laboratory determination of the dynamic mechanical properties of visco‑elastic (resilient) materials used in vibration isolators. The method uses a fixed‑end cantilever shear beam to avoid clamping‑induced errors (no rotational motion at ends) and is applicable to shock and vibration systems from a fraction of a hertz up to about 20 kHz. Results (complex Young’s modulus, loss factor, etc.) support design, selection, modelling and quality control of vibration‑isolation materials and products.

Key topics and technical requirements

• Test principle: sinusoidal shear excitation of a beam specimen with fixed ends (cantilever shear mode) to obtain frequency‑dependent modulus and damping.
• Linearity requirement: measurements assume linear vibrational behaviour at the test strain magnitudes; checks include measuring modulus over a range of input levels.
• Time–temperature superposition: measurements at multiple temperatures (typically stepped by ~5 °C with control ~±0.5 °C) are shifted along the frequency axis to extend the usable frequency range.
• Measured quantities: complex Young’s modulus (real and imaginary parts) and loss factor (tan δ).
• Essential equipment:
  • Electro‑dynamic vibration generator (typical range 0.3–30 Hz; force >10 N; amplitude ≈100 µm)
  • Force measurement (calibrated; uncertainty <0.5 % typical)
  • Non‑contact displacement transducer (eddy‑current or optical; uncertainty <0.5 %)
  • Rigid clamping/end blocks and drive shaft to ensure fixed‑fixed deformation mode
  • Environmental chamber for temperature control and conditioning
  • Computer for data acquisition, calibration and analysis
• Procedures covered: specimen preparation and mounting, conditioning, calibration, measurement runs, temperature cycling, data presentation and test reporting.

Applications

• Design and optimization of vibration isolators, mounts and shock absorbers
• Selection of visco‑elastic materials for acoustics and vibration control (structure‑borne, airborne, fluid‑borne)
• Theoretical computation and modelling of vibration transfer through isolators
• Product development, supplier data sheets and quality control testing of resilient components
• Assessing low‑frequency vibration transmission that affects humans, equipment or structures

Who uses this standard

• Vibration and acoustics engineers
• Materials scientists and test laboratories
• Manufacturers and suppliers of vibration isolators, mounts and damping materials
• Product development and quality assurance teams in automotive, aerospace, industrial machinery and building‑isolation sectors

Related standards

• ISO 18437-2 (Resonance method)
• ISO 6721-1, ISO 4664-1, ISO 10112, ISO 10846-1, ISO 23529 (referenced guidance on terminology, specimen prep and dynamic testing)

Keywords: ISO 18437-3:2005, cantilever shear beam, visco‑elastic materials, dynamic mechanical properties, vibration isolator testing, time‑temperature superposition, loss factor, Young’s modulus.