Overview
ISO 22183:2023 - Plastics: Validation of force-time curves obtained from high-speed tensile tests - defines a practical procedure to validate dynamic force measurements from high-speed tensile testing of plastics. The standard focuses on identifying the natural oscillation spectrum of the force transducer + grip assembly and using the lowest significant resonance to assess whether measured force‑time curves are reliable. Once the system frequencies and the anticipated strain are known, the method also supports calculation of a theoretical maximum allowed test speed.
Key topics and technical requirements
- Natural oscillation measurement: Create a defined single centric impact on the grip using a striker; record the force-time response and extract the spectrum by FFT.
- Signal acquisition:
- Sampling rate: at least twice the highest frequency of interest; 100 kHz recommended.
- Measurement duration: capture the residual oscillations over about 5–12 ms.
- Perform three strikes and average spectra.
- FFT analysis:
- Use an appropriate time window (1.5 cycles after the impact peak is recommended for amplitude spectrum) and record window function.
- Normalize amplitudes and plot normalized intensity vs. frequency.
- Select the lowest relevant frequency (f_low) that shows a normalized intensity of 50% or more.
- Acceptance criteria:
- Minimum event time (related to f_low and required number of oscillation cycles) ensures an event (yield/break) is resolvable.
- Maximum allowed intensity: ratio of oscillation amplitude to maximum test force must be acceptable; large resonant amplitudes relative to F_max invalidate the curve.
- Practical setup requirements:
- Striker must be centric to ±5 mm (or report deviation).
- Impact level: residual oscillation peak >10% of full-scale of selected force range, ≥200 N, and ≥3× unloaded-state maximum.
- Document amplifier range, cut-off frequency, and acquisition parameters.
Applications and users
- Test laboratories validating high‑speed tensile data for plastics.
- Manufacturers of high‑speed tensile test machines and force transducers.
- Materials researchers studying high strain‑rate behavior of polymers.
- Quality control in automotive, aerospace, sports equipment and any industry where dynamic tensile properties of plastics are critical.
ISO 22183 helps determine whether force‑time measurements are free from resonant artifacts and supports selection of safe maximum test speeds.
Related standards (if applicable)
- Use ISO 22183 alongside established tensile testing and instrumentation standards and laboratory calibration procedures to ensure comprehensive test validity.