ISO 10113-2020 PDF

Full title and description

ISO 10113:2020 — Metallic materials — Sheet and strip — Determination of plastic strain ratio. This international standard specifies test procedures and calculation methods for determining the plastic strain ratio (r‑value, also called the Lankford coefficient) of flat metallic products (sheet and strip) to quantify normal and planar anisotropy for material qualification and forming applications.

Abstract

ISO 10113:2020 defines the method(s) to determine the plastic strain ratio of sheet and strip metallic materials. It gives definitions, test-piece orientations, three test procedures (manual, semi‑automatic and automatic), requirements for test equipment and calibration, calculation formulas for r, weighted average r and degree of planar anisotropy (Δr), and guidance on result reporting and sources of error.

General information

• Status: Published.
• Publication date: January 2020 (ISO edition 3 — published 2020‑01; a corrected version issued in November 2020).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.040.10 — Mechanical testing of metals.
• Edition / version: 3rd edition (ISO 10113:2020, corrected version 2020‑11).
• Number of pages: 24 pages (official ISO edition).

Scope

Specifies a method for determining the plastic strain ratio (r) of flat products — sheet and strip — made of metallic materials. The standard addresses specimen orientation relative to rolling direction, test procedures (manual, semi‑automatic, automatic), instrumentation and calibration requirements, calculation of r and derived parameters (weighted average r and Δr), and reporting requirements.

Key topics and requirements

• Definition of plastic strain ratio r = (true plastic width strain) / (true plastic thickness strain) and practical calculation using measured length/width changes and the constancy of volume assumption up to Ag (percentage plastic extension at maximum force).
• Three test procedures: manual (post‑test measurements), semi‑automatic (length extensometer) and automatic (simultaneous length and width extensometers) to ensure comparable results.
• Specified specimen orientations (commonly 0°, 45° and 90° to the rolling direction) and formulas for weighted average r (r_m = (r0 + 2·r45 + r90)/4) and degree of planar anisotropy Δr = (r0 + r90 − 2·r45)/2.
• Instrument and test-machine requirements and calibration references (tensile machine compliance per ISO 6892‑1 and extensometer calibration per ISO 9513).
• Reporting requirements, annexes on error analysis and international symbol comparisons to support consistent interpretation and use in material qualification and forming simulations.

Typical use and users

Used by materials testing laboratories, steel and non‑ferrous sheet producers, automotive and appliance manufacturers, forming/process engineers and R&D groups to quantify normal and planar anisotropy for deep drawing, stamping and simulation input (material models). Test houses use the standard to produce comparable r‑values for quality control, specification compliance and forming simulations.

Related standards

Normative and related documents frequently cited with ISO 10113 include ISO 6892‑1 (tensile testing at room temperature), ISO 9513 (calibration of extensometer systems), and related test methods for formability (for example ASTM E517 covers plastic strain ratio tests in a different jurisdiction). Regional/adopted versions exist (e.g., EN ISO 10113:2020 / national adoptions).

Keywords

plastic strain ratio, r‑value, Lankford coefficient, sheet, strip, anisotropy, r0, r45, r90, r_m (average r), Δr (planar anisotropy), tensile test, extensometer, ISO 6892‑1, ISO 9513.

FAQ

Q: What is this standard?

A: ISO 10113:2020 is an international standard that specifies methods to determine the plastic strain ratio (r‑value) of metallic sheet and strip, providing definitions, test procedures, calculation formulas and reporting rules.

Q: What does it cover?

A: It covers specimen orientation, three test procedures (manual, semi‑automatic, automatic), instrumentation and calibration requirements, calculation of r and derived parameters (weighted average and degree of planar anisotropy), and guidance on error analysis and symbols.

Q: Who typically uses it?

A: Materials testing laboratories, sheet/strip producers, automotive and appliance manufacturers, forming engineers, simulation specialists and researchers who need reliable r‑values for quality control, specification and forming-process design.

Q: Is it current or superseded?

A: Current — ISO 10113:2020 is the active (3rd) edition published in January 2020; it replaced ISO 10113:2006. A corrected version was issued in November 2020. Standards are subject to periodic review.

Q: Is it part of a series?

A: It is part of the family of ISO standards addressing mechanical testing and formability of metallic sheet (cross‑referenced with ISO 6892‑1, ISO 9513 and other sheet‑testing standards). Regional adoptions/EN versions exist (EN ISO 10113:2020).

Q: What are the key keywords?

A: plastic strain ratio, r-value, Lankford coefficient, anisotropy, sheet metal, tensile test, extensometer, r0 r45 r90, average r (r_m), planar anisotropy (Δr).