ASTM E740/E740M-23 PDF
Name in English:
St ASTM E740/E740M-23
Name in Russian:
Ст ASTM E740/E740M-23
Original standard ASTM E740/E740M-23 in PDF full version. Additional info + preview on request
Full title and description
ASTM E740/E740M-23 — Standard Practice for Fracture Testing with Surface‑Crack Tension Specimens. This practice describes the design, preparation, and fracture testing of surface‑crack tension (SCT) specimens to determine residual strength for specimens containing semi‑elliptical or circular‑segment fatigue cracks in one surface under continuously increasing tensile force.
Abstract
This standard practice specifies procedures for producing and testing SCT specimens used in fracture mechanics evaluations. It addresses specimen geometry, crack preparation, test setup, loading conditions (monotonic tensile loading), and the measurement and reporting of residual strength related to surface cracks. Cyclic and sustained loadings are excluded; the focus is on strength measurement as a function of crack size and specimen thickness.
General information
- Status: Active (current edition).
- Publication date: November 15, 2023.
- Publisher: ASTM International.
- ICS / categories: Mechanical testing of metals — fracture mechanics / metals testing (ICS code commonly referenced: 77.040.10).
- Edition / version: E740/E740M-23 (current revision of E740/E740M series).
- Number of pages: 9 pages.
Scope
This practice covers the design, preparation, and fracture testing of surface‑crack tension (SCT) specimens for determining residual strength of materials containing surface fatigue cracks. It applies to monotonic, continuously increasing tensile loading and excludes cyclic (fatigue) or sustained load tests. The measured quantity is dependent on crack geometry (semi‑elliptical or circular‑segment), crack dimensions, specimen thickness, and material properties; guidance is provided for specimen geometry, crack sizing, test setup, and reporting.
Key topics and requirements
- Definitions and geometry of surface‑crack tension (SCT) specimen designs (dimensions, notch and crack shapes).
- Procedures for creating and measuring semi‑elliptical or circular‑segment surface fatigue cracks.
- Test fixture and alignment requirements for monotonic tensile loading of SCT specimens.
- Test control and data acquisition: load application, displacement/strain measurement, and failure detection.
- Calculation and reporting of residual strength as a function of crack dimensions and specimen thickness.
- Limitations: excludes cyclic and sustained loading protocols; intended for residual strength determination under monotonically increasing force.
Typical use and users
Used by materials engineers, fracture mechanics researchers, quality and test laboratories, and manufacturers evaluating the residual strength of metallic components with surface cracks. Typical applications include component integrity assessment, validation of repair methods, material comparisons, and research into crack‑growth/strength behavior where surface cracks are present.
Related standards
Preceding and related documents include earlier editions of ASTM E740 and E740/E740M (for example E740-03 and E740/E740M-03(2016)). The practice is maintained under ASTM Committee E08 on Fatigue and Fracture (subcommittee E08.07 on Fracture Mechanics) and complements other fracture‑mechanics standards addressing compact tension (CT), single‑edge notch tension (SENT), and fatigue crack growth test methods.
Keywords
surface‑crack tension, SCT, fracture testing, residual strength, surface crack, semi‑elliptical crack, circular‑segment crack, fracture mechanics, tensile test, ASTM E740/E740M-23.
FAQ
Q: What is this standard?
A: It is ASTM E740/E740M-23, a Standard Practice that provides procedures for fracture testing of surface‑crack tension specimens to determine residual strength under monotonic tensile loading.
Q: What does it cover?
A: The practice covers SCT specimen design, crack preparation (semi‑elliptical or circular‑segment surface fatigue cracks), test fixturing and alignment, load application under continuously increasing force, measurement and reporting of residual strength, and limitations (it excludes cyclic and sustained loadings).
Q: Who typically uses it?
A: Materials and mechanical engineers, fracture mechanics researchers, test laboratories, and manufacturers that need to evaluate the residual strength of components or materials containing surface cracks.
Q: Is it current or superseded?
A: It is the current ASTM edition (E740/E740M-23), published November 15, 2023, and replaces earlier editions of E740/E740M.
Q: Is it part of a series?
A: Yes — it belongs to the ASTM E740/E740M series of fracture‑mechanics practice documents and is maintained by ASTM Committee E08 (Fatigue and Fracture), subcommittee E08.07 (Fracture Mechanics). It complements related ASTM fracture and fatigue test standards (CT, SENT, fatigue crack growth methods).
Q: What are the key keywords?
A: Residual strength; surface‑crack tension; SCT; surface crack; semi‑elliptical crack; circular‑segment crack; fracture testing; fracture mechanics; tensile loading.