ASTM E2248-25 PDF
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St ASTM E2248-25
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Ст ASTM E2248-25
Original standard ASTM E2248-25 in PDF full version. Additional info + preview on request
Full title and description
ASTM E2248-25 — Standard Test Method for Impact Testing of Miniaturized Charpy V-Notch (MCVN) Specimens. This standard specifies procedures, apparatus, specimen dimensions, and measurement/recording requirements for performing notched-bar impact tests on miniaturized Charpy V‑notch specimens used when standard Charpy (CVN) specimens cannot be prepared.
Abstract
Provides a method for conducting impact tests on miniaturized Charpy V‑notch specimens, including apparatus description, inspection and calibration requirements, specimen preparation, testing procedures, and statements on precision and bias. The standard notes that MCVN results are not directly comparable to full‑size CVN results without established correlations and recommends instrumented testing (per E2298) where appropriate.
General information
- Status: Active (current version E2248-25).
- Publication date: 2025 (active/updated — last updated May 16, 2025).
- Publisher: ASTM International.
- ICS / categories: 77.040.10 — Mechanical testing of metals.
- Edition / version: E2248-25.
- Number of pages: 7. (DOI: 10.1520/E2248-25).
Scope
This test method describes notched‑bar impact testing of metallic materials using Miniaturized Charpy V‑Notch (MCVN) specimens and associated apparatus, covering apparatus description, inspection and calibration, safety, sampling, specimen dimensions and preparation, test procedures, and precision/bias. It distinguishes MCVN from sub‑size Charpy specimens and stresses that MCVN data require correlation before direct comparison with standard CVN data.
Key topics and requirements
- Description of test apparatus and permitted machine adaptations for MCVN testing.
- Specimen geometry, notch preparation, and surface/finish requirements for miniaturized Charpy V‑notch specimens.
- Requirements for instrument calibration, inspection, and measurement/recording equipment to achieve sensitivity comparable to standard CVN tests.
- Guidance on instrumented impact testing (force vs. time and force‑displacement curves) with reference to Test Method E2298 for instrumented striker use.
- Advisory statements on interpretation: MCVN transition behavior and upper shelf energy require correlation to CVN results; MCVN data should be used within a fracture‑mechanics framework.
- Precision and bias established by interlaboratory studies (research reports supporting the precision statement).
Typical use and users
Used by metallurgical and mechanical testing laboratories, materials engineers, R&D groups, and failure‑analysis teams when material volume is limited, when specimens must be taken from thin product forms or in‑service components, or when reuse of broken halves is required. Common application areas include aerospace, petrochemical, power generation, and materials research where brittle/ductile transition behavior and impact resistance of ferritic metals must be characterized from small samples.
Related standards
Key related documents include Test Methods E23 (standard Charpy V‑notch test procedures and sub‑size specimen definitions) and Test Method E2298 (instrumented striker/force‑displacement instrumentation used with impact testing). Earlier versions of this method (E2248‑18, E2248‑15, etc.) are superseded by E2248‑25. The standard was developed by ASTM Committee E28 (subcommittee E28.07).
Keywords
Miniaturized Charpy, MCVN, impact test, Charpy V‑notch, instrumented impact test, E2248, E2298, lateral expansion, notch specimen, DBTT, upper shelf energy (USE), precision and bias, pendulum impact.
FAQ
Q: What is this standard?
A: ASTM E2248-25 is the ASTM test method for impact testing of Miniaturized Charpy V‑Notch (MCVN) specimens — a procedure for conducting and reporting notched‑bar impact tests on specimens smaller than standard Charpy specimens.
Q: What does it cover?
A: It covers apparatus and machine requirements (including permissible modifications), specimen dimensions and preparation, calibration and inspection, test procedures, recommended instrumentation (including reference to E2298), and statements on precision, bias, and interpretation of results (including the need for correlation to full‑size CVN data).
Q: Who typically uses it?
A: Materials testing labs, forensic/failure engineers, R&D and quality groups, and organizations needing impact data from limited or thin material samples — e.g., aerospace, power, pipeline/petrochemical, and materials research sectors.
Q: Is it current or superseded?
A: E2248-25 is the current (active) version of this standard (version -25, active/updated in 2025). Earlier iterations such as E2248-18 are superseded.
Q: Is it part of a series?
A: It is part of the ASTM E2248 family of test methods (previous editions) and is closely associated with other ASTM impact and instrumented impact standards, notably E23 (Charpy V‑notch baseline methods) and E2298 (instrumented impact testing). The document was developed under Committee E28 (subcommittee E28.07).
Q: What are the key keywords?
A: Miniaturized Charpy, MCVN, impact test, instrumented impact, Charpy V‑notch, DBTT, upper shelf energy, precision and bias, specimen dimensions.