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ASTM

Definition: ASTM (ASTM International, formerly the American Society for Testing and Materials) is a globally recognised standardisation organisation that develops technical standards for materials, testing methods and products. ASTM standards define requirements for chemical composition, mechanical properties and testing methods. They are particularly authoritative in the North American market.

Practical relevance: ASTM standards such as ASTM A516 (pressure vessel steel) or ASTM E1820 (fracture mechanics) are used internationally. They govern testing conditions, specimen geometries and acceptance criteria. In global projects, ASTM standards are frequently applied in parallel with EN or ISO standards.

Decision-making perspectives:

  • Technical decision-makers: Ensuring internationally comparable material and testing criteria.
  • Purchasing/project management: Contractually clear specification for export and US projects.
  • Science: Comparability of test results worldwide.
  • Insurance/law: Reference framework in international liability cases.

FAQ:

  • Where are ASTM standards mainly applied?
  • Primarily in the USA, but increasingly also in international industrial projects.

ASTM E1820 – Fracture Mechanics Testing

Definition: ASTM E1820 is a US testing standard for determining the fracture toughness of metallic materials. It describes procedures for determining parameters such as KIc, J-integral (JIc) and CTOD. The standard is central to the fracture mechanics assessment of components containing cracks.

Practical relevance: ASTM E1820 defines specimen geometries (CT, SENB), pre-cracking, loading rate and evaluation methods including R-curves. It is used in pressure equipment construction, in aviation and in the energy industry. Results feed into fitness-for-service analyses and service-life assessments.

Decision-making perspectives:

  • Technical decision-makers: Assessment of critical crack sizes and safety margins.
  • Purchasing/project management: Specification of fracture mechanics parameters in international projects.
  • Science: Comparison with ISO 12135 and validation of crack growth models.
  • Insurance/law: Verification of standard-compliant fracture toughness testing.

Typical testing or verification methods: CT and SENB specimens, J-R curves, CTOD determination.

FAQ:

  • Which parameters are determined according to ASTM E1820?
  • KIc, JIc and CTOD for assessing crack toughness.
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