ISO 10275-2020 PDF

Full title and description

ISO 10275:2020 — Metallic materials — Sheet and strip — Determination of tensile strain hardening exponent. This International Standard specifies a laboratory method to determine the tensile strain hardening exponent (n) for flat metallic products (sheet and strip), including treatment for materials showing serrated (Portevin–Le Chatelier) behaviour to ensure reproducible results.

Abstract

This standard defines the test procedure and the calculation method used to obtain the tensile strain hardening exponent n from tensile test data taken in the plastic range where the stress–strain curve is continuous and monotonic. For materials with serrated work-hardening behaviour, the standard describes an automatic determination approach (linear regression of log true stress vs. log true plastic strain) to improve reproducibility.

General information

• Status: Published
• Publication date: 19 August 2020 (Edition 3, 2020-08)
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 77.040.10 — Mechanical testing of metals
• Edition / version: Edition 3 (2020)
• Number of pages: 10 (ISO main document; national/adopted versions such as EN/BSI may include additional national foreword material and appear with more pages, e.g., ~18 pages).

Scope

ISO 10275:2020 applies to flat metallic products (sheet and strip) and specifies a method for determining the tensile strain hardening exponent n from tensile test results. The method is intended for the portion of the stress–strain curve in the plastic region that is continuous and monotonic; it also provides guidance for materials with serrated stress–strain curves (Portevin–Le Chatelier effect) using an automatic/logarithmic-regression approach to obtain reproducible n values.

Key topics and requirements

• Definition and significance of the tensile strain hardening exponent (n) for sheet and strip metals.
• Specification of tensile test conditions and selection of the plastic-range portion of the stress–strain curve to be used for n determination.
• Data transformation and calculation method: linear regression of log(true stress) vs. log(true plastic strain) to derive n.
• Procedures to handle serrated (Portevin–Le Chatelier) behaviour to improve reproducibility of automated determinations.
• Requirements for reporting test results and any deviations from the prescribed method.

Typical use and users

Used by materials testing laboratories, metallurgical and mechanical testing engineers, sheet/strip manufacturers, quality control and R&D departments, and standards/qualification bodies. Typical applications include material characterization, process development, product specification, and comparative studies of work-hardening behaviour.

Related standards

ISO 10275:2020 is applied alongside general tensile-testing standards and product-specific test methods. A commonly referenced companion is the ISO series for tensile testing of metallic materials (for example ISO 6892‑1 for tensile testing at room temperature), which defines tensile-test machine requirements, specimen shapes and general test procedures used to generate the data for n determination. National and regional adoptions (EN, BS, etc.) may also exist.

Keywords

tensile strain hardening exponent; strain hardening; sheet; strip; metallic materials; tensile test; Portevin–Le Chatelier; work hardening; log–log regression; material characterization.

FAQ

Q: What is this standard?

A: ISO 10275:2020 is an International Standard that specifies a laboratory method to determine the tensile strain hardening exponent (n) for sheet and strip metallic products.

Q: What does it cover?

A: It covers the selection of the plastic portion of the stress–strain curve, the calculation procedure (commonly via linear regression of logarithmic true stress vs. true plastic strain), handling of serrated stress–strain behaviour, and required reporting of results.

Q: Who typically uses it?

A: Materials test laboratories, manufacturers of sheet/strip metals, mechanical and metallurgical engineers, QA/QC teams, and researchers use this standard to quantify work-hardening behaviour and to support material specifications.

Q: Is it current or superseded?

A: ISO 10275:2020 is the current edition published in 2020; it replaces earlier editions including ISO 10275:2007. National/adopted versions (EN/BS/other) may exist in parallel.

Q: Is it part of a series?

A: It is a standalone test-method standard focused on the strain hardening exponent for sheet and strip, but it is commonly used together with broader tensile-testing standards (for example the ISO 6892 series) and with product- or industry-specific test methods and EN/BS adopted documents.

Q: What are the key keywords?

A: Tensile strain hardening exponent, strain hardening, sheet, strip, tensile test, work hardening, Portevin–Le Chatelier, true stress, true plastic strain, log–log regression.