Overview
ISO 17340:2020 - Metallic materials - Ductility testing - High speed compression test for porous and cellular metals - defines standardized methods for measuring the high‑speed compressive behaviour of porous and cellular metallic materials (porosity ≥ 50 %) at room temperature. The standard covers test speeds from 0.1 m/s to 100 m/s (equivalent to initial strain rates of about 1 s−1 to 10^3 s−1 for a 100 mm specimen) and specifies both drop weight impact and servo‑type high‑speed compression methods to obtain compressive force and displacement data for evaluation of properties such as plateau stress and energy absorption.
Key topics and technical requirements
- Scope & test conditions
- Applies to porous/cellular metals with porosity ≥ 50 % at room temperature.
- Test speed range: 0.1–100 m/s (initial strain rate reference provided).
- Test methods
- Drop weight impact test: controls speed via drop height (weight, guide, absorber); addresses deceleration of the mass and possible need for initial velocity.
- Servo‑type high‑speed compression test: hydraulic/electric servo drive to follow a set test speed (includes approach length control).
- Testing machine components
- Weight, guide frame, pressing jig, load cell, displacement sensor, absorber; servo machines may include rupture pins or stoppers.
- Measurement & data
- Record compressive force and displacement at appropriate sampling frequency; Annex A gives guidance on filtering measurement data.
- Calculations include compressive stress/strain, stress‑strain curve, plateau stress (σ_pl), plateau end strain (e_ple), and energy absorption metrics.
- Calibration & conformity
- References calibration/verification standards such as ISO 376 and ISO 7500‑1 for force measuring systems.
- Specimen preparation
- Shapes, dimensions and preparation procedures are specified to ensure reproducible results; initial height is used to derive initial strain rate.
Applications and who uses it
- Automotive and transport engineers evaluating metal foams or energy‑absorbing components for crashworthiness.
- Materials scientists characterizing dynamic ductility and deformation behavior of cellular metals.
- Quality control and testing laboratories needing reproducible, standardized dynamic compression tests.
- Manufacturers of porous metals, structural foams, and lattice components who require performance data for design validation.
Related standards
- ISO 13314 - Compression test for porous and cellular metals (static)
- ISO 376 - Calibration of force‑proving instruments
- ISO 7500‑1 - Calibration and verification of static uniaxial testing machines
Keywords: ISO 17340:2020, high speed compression test, porous metals, cellular metals, ductility testing, drop weight impact test, plateau stress, energy absorption, initial strain rate.