ISO 24213:2017 PDF

Metallic materials — Sheet and strip — Method for springback evaluation in stretch bending

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Title (English):

ISO 24213:2017

Metallic materials — Sheet and strip — Method for springback evaluation in stretch bending

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 11
Publication date:: June 7, 2017
Edition:: ISO IS 24213 edition 2 version 1
ICS:: 77.040.10

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Description (English):

ISO 24213:2017 specifies a method for evaluating the amount of springback of sheets of metallic materials known to exhibit large amounts of springback subjected to plane-strain stretch bending, which is a typical deformation mode generated in press-formed panels. By using this method, the amount of springback under stretch bending is evaluated accurately and quantitatively.

Technical details

Technical committee: ISO/TC 164/SC 2 - Ductility testing
SKU: ISO 24213:2017

Abstract

Overview

ISO 24213:2017 - "Metallic materials - Sheet and strip - Method for springback evaluation in stretch bending" defines a standardized laboratory method to quantitatively evaluate springback of metallic sheet and strip produced by plane‑strain stretch bending, a deformation mode typical in press‑formed panels. The standard enables consistent measurement of elastic recovery (springback) by comparing curvature under load and after removal of load, supporting material specification, die design, process control and finite‑element model calibration.

Key topics and requirements

Test principle: Measure curvature of a stretch‑bent specimen under load (punch contact) and after release; compute the amount of springback as the relative change in curvature.
Test specimen: Rectangular specimen (500 ± 10 mm long × 50 ± 1 mm wide); thickness equals original sheet thickness; cut orientation (parallel or perpendicular to rolling direction) agreed by parties.
Test apparatus: Stretch‑bending device with a semi‑cylindrical punch (radius (100 ± 1) mm typical). Figure and tool setup defined in the standard.
Loading and measurement:
- Apply calculated blank holding pressure (Annex A); maximum recommended blank holding pressure ≈ 2–3 % of material tensile strength.
- Control nominal tensile stress from measured punch penetration and force (Annex B).
- Measure radius of curvature after unloading using a dial gauge or optical probes; dial gauge accuracy 0.001 mm recommended and base width typically 20 mm (Annex C).
- Environmental/control conditions: ambient 10 °C to 35 °C (preferably 23 ± 5 °C).
Friction and lubrication: Minimize friction (recommended μ

Related standards

Other ISO standards

Overview

Key topics and requirements

Test principle: Measure curvature of a stretch‑bent specimen under load (punch contact) and after release; compute the amount of springback as the relative change in curvature.
Test specimen: Rectangular specimen (500 ± 10 mm long × 50 ± 1 mm wide); thickness equals original sheet thickness; cut orientation (parallel or perpendicular to rolling direction) agreed by parties.
Test apparatus: Stretch‑bending device with a semi‑cylindrical punch (radius (100 ± 1) mm typical). Figure and tool setup defined in the standard.
Loading and measurement:
- Apply calculated blank holding pressure (Annex A); maximum recommended blank holding pressure ≈ 2–3 % of material tensile strength.
- Control nominal tensile stress from measured punch penetration and force (Annex B).
- Measure radius of curvature after unloading using a dial gauge or optical probes; dial gauge accuracy 0.001 mm recommended and base width typically 20 mm (Annex C).
- Environmental/control conditions: ambient 10 °C to 35 °C (preferably 23 ± 5 °C).
Friction and lubrication: Minimize friction (recommended μ

ISO 24213:2017 PDF

Technical details

Abstract

Overview

Key topics and requirements

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