ISO 26843:2015
Metallic materials - Measurement of fracture toughness at impact loading rates using precracked Charpy-type test pieces

Standard No.
ISO 26843:2015
Release Date
2015
Published By
International Organization for Standardization (ISO)
Latest
ISO 26843:2015
Scope
This International Standard specifies requirements for performing and evaluating instrumented precracked Charpy impact tests on metallic materials using a fracture mechanics approach. Minimum requirements are given for measurement and recording equipment such that similar sensitivity and comparable measurements are achieved. Dynamic fracture mechanics properties determined using this International Standard are comparable with conventional large-scale fracture mechanics results when the corresponding validity criteria are met. Because of the small absolute size of the Charpy specimen, this is often not the case. Nevertheless, the values obtained can be used in research and development of materials, in quality control, and to establish the variation of properties with test temperature under impact loading rates. Fracture toughness properties determined through the use of this International Standard may differ from values measured at quasistatic loading rates. Indeed, an increase in loading rate causes a decrease in fracture toughness when tests are performed in the brittle or ductile-to-brittle regimes; the opposite is observed (i.e. increase in fracture toughness) in the fully ductile regime. More information on the dependence of fracture toughness on loading (or strain) rate is given in Reference [1]. In addition, it is generally acknowledged that fracture toughness also depends on test temperature. For these reasons, the user is required to report the actual test temperature and loading rate for each test performed. In case of cleavage fracture of ferritic steels in the ductile-to-brittle transition region, variability can be very large and cannot be adequately described by simple statistics. In this case, additional tests are required and the analysis is to be performed using a statistical procedure applicable to this type of test, see for example Reference [2]. NOTE Modifications to the analytical procedures prescribed in Reference [2] might be necessary to account for the effect of elevated (impact) loading rates.

ISO 26843:2015 Referenced Document

  • ASTM E1820-15 Standard Test Method for Measurement of Fracture Toughness*2024-04-20 Update
  • ASTM E1921-15 Standard Test Method for Determination of Reference Temperature, To, for Ferritic Steels in the Transition Range
  • ISO 12135:2002 Metallic materials - Unified method of test for the determination of quasistatic fracture toughness
  • ISO 14556:2015 Metallic materials - Charpy V-notch pendulum impact test - Instrumented test method
  • ISO 148-1:2009 Metallic materials - Charpy pendulum impact test - Part 1: Test method
  • ISO 148-2:2008 Metallic materials - Charpy pendulum impact test - Part 2: Verification of testing machines
  • ISO 26203-2:2011 Metallic materials - Tensile testing at high strain rates - Part 2: Servo-hydraulic and other test systems
  • ISO 3785:2006 Metallic materials - Designation of test specimen axes in relation to product texture

ISO 26843:2015 history

  • 2015 ISO 26843:2015 Metallic materials - Measurement of fracture toughness at impact loading rates using precracked Charpy-type test pieces
Metallic materials - Measurement of fracture toughness at impact loading rates using precracked Charpy-type test pieces



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