ASTM E606/E606M-21 PDF

Full title and description

Standard Test Method for Strain-Controlled Fatigue Testing — ASTM E606/E606M-21. This standard provides procedures, specimen recommendations, test-control practices, and data-reporting requirements for uniaxial, strain-controlled fatigue testing of nominally homogeneous metallic materials (gauge-section specimens), intended for materials research, design, quality control and failure analysis.

Abstract

ASTM E606/E606M-21 specifies a method to determine fatigue properties under strain-controlled cyclic loading. It focuses on measurement and control of total and plastic strain, use of appropriate specimen geometries and extensometry, reporting of hysteresis data and cyclic stress–strain behavior, and treatment of hold times and environmental conditions. The procedure supports low-cycle and other strain-controlled testing where inelastic strains are significant.

General information

• Status: Active standard (current edition E606/E606M-21).
• Publication date: 2021 (current edition approved in mid‑2021 and published/updated in 2021; designation E606/E606M-21).
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: Mechanical testing of metals; ICS code listed as 77.040.10 (mechanical testing / fatigue testing).
• Edition / version: E606/E606M-21 (2021 edition).
• Number of pages: 16 pages (typical published PDF length).

Scope

This test method covers determination of fatigue properties of nominally homogeneous materials using uniform‑gage, uniaxial specimens subjected to strain‑controlled cyclic loading. It is limited to specimen testing (not full‑scale components), applies when time‑dependent inelastic strains are on the same order or less than time‑independent inelastic strains, and may be used at a range of temperatures and controlled environments provided these conditions are reported. The test method is intended primarily for strain‑controlled testing (low‑cycle and related tests) but contains guidance that can be useful for some force- or stress‑controlled tests.

Key topics and requirements

• Strain‑controlled cycling: procedures for controlling total strain and determining cyclic plastic strain components.
• Specimen geometry: recommended uniform‑gage and hourglass specimen recommendations and dimensional guidance for consistent axial alignment and gage measurement.
• Measurement and instrumentation: use and calibration of extensometers, transducers, and data acquisition to capture hysteresis loops and cyclic stress–strain response.
• Test control and reporting: constant‑amplitude cycling, optional hold times, frequency/strain‑rate considerations, and required data reporting (hysteresis loops, cycle counts, failure criteria, environment, temperature).
• Units and conversions: separate treatment of SI and inch‑pound units (each system is a standard on its own; avoid mixing values across systems without careful conversion).
• Data analysis: extraction of cyclic stress–strain curves, fatigue life (cycles to failure) definitions, and guidance on interpretation for design and material comparisons.
• Applicability limits: applies to specimens and uniaxial tests; exercise caution when extending results to complex components or multiaxial states.

Typical use and users

Used by materials researchers, metallurgists, fatigue laboratories, test‑house personnel, and design engineers in industries such as aerospace, automotive, power generation (including nuclear), and heavy machinery. Typical applications include low‑cycle fatigue characterization, development of cyclic constitutive relationships, validation of life‑prediction models, process and material quality control, and failure analysis.

Related standards

Commonly referenced companion or related standards and practices include ASTM E466 (force‑controlled constant‑amplitude axial fatigue tests), ASTM E8/E8M (tensile testing), ASTM E1049 (cycle counting), ASTM E1150 (definitions of terms relating to fatigue), and international equivalents such as ISO/GOST/GB standards on strain‑controlled fatigue testing (for example ISO 12111 / national translations). The E606 document itself lists multiple related ASTM standards for specimen preparation, instrumentation, and reporting.

Keywords

strain‑controlled fatigue, low‑cycle fatigue, cyclic strain, hysteresis loop, plastic strain, extensometer, fatigue life, cyclic stress‑strain curve, specimen geometry, fatigue testing protocol.

FAQ

Q: What is this standard?

A: ASTM E606/E606M-21 is the ASTM standard test method that defines procedures and reporting for uniaxial, strain‑controlled fatigue testing of metallic specimens. It establishes how to control and measure cyclic strains, collect hysteresis data, and report fatigue properties.

Q: What does it cover?

A: It covers specimen selection and geometry recommendations, instrumentation and extensometry, test control (strain amplitudes, rates, hold times), data acquisition and required reporting (hysteresis loops, cyclic stress–strain data, number of cycles to failure), and applicability limits (specimen testing, uniaxial strain control). It does not cover full‑scale component testing.

Q: Who typically uses it?

A: Materials and fatigue test laboratories, R&D teams in aerospace, automotive and power industries, mechanical design engineers, and failure‑analysis specialists who need standardized, repeatable strain‑controlled fatigue data.

Q: Is it current or superseded?

A: The current edition is E606/E606M-21 (2021). It is the active edition of the practice as published by ASTM International; earlier editions (for example 2012/2019 versions) have been superseded by the 2021 designation. Users requiring the official, definitive text should refer to the ASTM publication for the formal document and any errata.

Q: Is it part of a series?

A: It is part of ASTM Committee E08 activity on fatigue and fracture and is commonly used alongside other ASTM test methods and practices for fatigue and mechanical testing (E466, E8/E8M, E1049, E1150, etc.). These related standards form the suite of test methods used for comprehensive fatigue characterization.

Q: What are the key keywords?

A: Strain‑controlled fatigue, low‑cycle fatigue, cyclic plastic strain, hysteresis, extensometer, fatigue life, cyclic stress‑strain, specimen gage section.