ISO 20975-1:2023 PDF

Scope: This document specifies methods for determining the through-thickness properties (i.e. strength, modulus of elasticity, Poisson’s ratio and strain-to-failure) of fibre-reinforced plastic composites using either rectangular prism and/or waisted block specimens. The methods are suitable for use with a variety of aligned and non-aligned, continuous, and discontinuous fibre formats, with both thermoset and thermoplastic matrices, ranging from 20 mm to 40 mm in thickness. Three specimen types are described in this document. These are: — Type I - fixed rectangular cross-section along length of specimen. It is the preferred specimen for determining elastic properties. — Type II - waisted rectangular cross-section, variable cross-section along length of specimen. It is only suitable for determining tensile strength values and is the preferred specimen for highly anisotropic and thermoplastic materials. — Type III - waisted rectangular cross-section, fixed cross-section along the gauge-length of specimen. It is used to provide both elastic and strength property data and is the preferred specimen for generating a full stress-strain response. Specimen types I and II are also suitable for use with unreinforced plastics but are unsuitable for use with rigid cellular materials and sandwich structures containing cellular materials. Two testing modes are covered: — Method A – Tension — Method B – Compression

ISO 20975-1:2023 Referenced Document

ISO 2602 Statistical interpretation of test results; estimation of the mean; confidence interval
ISO 291 Plastics - Standard atmospheres for conditioning and testing
ISO 5893 Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of traverse) — Specification — Amendment 1
ISO 7500-1 Metallic materials - Calibration and verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Calibration and verification of the force-measuring system

2023 ISO 20975-1:2023 Fibre-reinforced plastic composites — Determination of laminate through-thickness properties — Part 1: Direct tension and compression tests