ISO 12135:2016
Metallic materials - Unified method of test for the determination of quasistatic fracture toughness

Standard No.

ISO 12135:2016

Release Date

2016

Published By

International Organization for Standardization (ISO)

Status

Be replaced

Replace By

ISO 12135:2021

Latest

ISO 12135:2021

Scope

This document specifies methods for determining fracture toughness in terms of K, δ, J and R-curves for homogeneous metallic materials subjected to quasistatic loading. Specimens are notched, precracked by fatigue and tested under slowly increasing displacement. The fracture toughness is determined for individual specimens at or after the onset of ductile crack extension or at the onset of ductile crack instability or unstable crack extension. In some cases in the testing of ferritic materials, unstable crack extension can occur by cleavage or ductile crack initiation and growth, interrupted by cleavage extension. The fracture toughness at crack arrest is not covered by this document. In cases where cracks grow in a stable manner under ductile tearing conditions, a resistance curve describing fracture toughness as a function of crack extension is measured. In most cases, statistical variability of the results is modest and reporting the average of three or more test results is acceptable. In cases of cleavage fracture of ferritic materials in the ductile-to-brittle transition region, variability can be large and additional tests may be required to quantify statistical variability. Special testing requirements and analysis procedures are necessary when testing weldments and these are described in ISO 15653 which is complementary to this document. When fracture occurs by cleavage or when cleavage is preceded by limited ductile crack extension, it may be useful to establish the reference temperature for the material by conducting testing and analysis in accordance with ASTM E1921.[2]

ISO 12135:2016 Referenced Document

• ASTM E1820-15 Standard Test Method for Measurement of Fracture Toughness*， 2024-04-20 Update
• ASTM E1921-16 Standard Test Method for Determination of Reference Temperature, To, for Ferritic Steels in the Transition Range*， 2024-04-20 Update
• ISO 15653:2010 Metallic materials - Method of test for the determination of quasistatic fracture toughness of welds
• ISO 3785:2006 Metallic materials - Designation of test specimen axes in relation to product texture
• ISO 7500-1:2015 Metallic materials - Calibration and verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Calibration and verification of the force-measuring system
• ISO 9513:2012 Metallic materials - Calibration of extensometer systems used in uniaxial testing

ISO 12135:2016 history

• 2021 ISO 12135:2021 Metallic materials - Unified method of test for the determination of quasistatic fracture toughness
• 2016 ISO 12135:2016 Metallic materials - Unified method of test for the determination of quasistatic fracture toughness
• 2008 ISO 12135:2002/Cor 1:2008 Metallic materials — Unified method of test for the determination of quasistatic fracture toughness TECHNICAL CORRIGENDUM 1
• 2002 ISO 12135:2002 Metallic materials - Unified method of test for the determination of quasistatic fracture toughness