ASTM E2948-22 PDF
Standard Test Method for Conducting Rotating Bending Fatigue Tests of Solid Round Fine Wire
Standard Test Method for Conducting Rotating Bending Fatigue Tests of Solid Round Fine Wire
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 10
- Дата публикации:
- 1 февраля 2022 г.
- Издание:
- E2948
- ICS:
- 77.140.65
SIGNIFICANCE AND USE 5.1 A method for obtaining fatigue strain (stress) at a specific life is of interest to the wire manufacturer, designer and consumer. The method is useful in production control, material acceptance and determination of the fatigue strain (stress) of the wire at a specific fatigue life, that is, fatigue strength. Rotating bending fatigue testing of small diameter solid round wire is possible by looping a specimen of predetermined length through an arc of 90° to 180°. The bending strain (stress) is determined from the geometry of the loop thusly formed. The methodology is capable of high frequency testing provided the temperature of the test article is constant and there is no adiabatic heating of the wire. A constant temperature can be maintained by immersing the specimen in a constant temperature fluid bath or test media. This makes it practical to quickly test a sufficient number of specimens to provide a statistical frequency distribution or survival probability distribution of fatigue life at a given strain (stress). Fatigue life information is useful to ascertain wire in-service durability and to assess, for example, the effects of melt practice and cold work processing. SCOPE 1.1 This test method is intended as a procedure for the performance of rotating bending fatigue tests of solid round fine wire to obtain the fatigue strength of metallic materials at a specified life in the fatigue regime where the strains (stresses) are predominately and nominally linear elastic. This test method is limited to the fatigue testing of small diameter solid round wire subjected to a constant amplitude periodic strain (stress). The methodology can be useful in assessing the effects of internal material structure, such as inclusions, in melt technique and cold work processing studies. However, there is a caveat. The strain, due to the radial strain gradient imposed by the test methodology, is a maximum at the surface and zero at the centerline. Thus the test method may not seek out the “weakest link,” largest inclusions, that govern uniaxial high cycle fatigue life where the strain is uniform across the cross section and where fatigue damage initiates at a subsurface location (1-5).2 Also, pre-strain, which can influence fatigue life, is not included in this test method. Note 1: The following documents, although not specifically mentioned, are considered sufficiently important to be listed in this test method: ASTM STP 566 Handbook of Fatigue Testing ASTM STP 588 Manual on Statistical Planning and Analysis for Fatigue Experiments ASTM STP 731 Tables for Estimating Median Fatigue Limits (6-8) 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM E2948-22, titled Standard Test Method for Conducting Rotating Bending Fatigue Tests of Solid Round Fine Wire, establishes a consistent procedure for assessing the fatigue behavior of small-diameter metallic wires. This test method evaluates the fatigue strength of fine round wires when subjected to cyclic rotating bending strains (stresses), under conditions where material behavior is nominally linear elastic. The standard is widely used in wire production control, material acceptance, and research into materials processing or structural integrity.
Key Topics
- Rotating Bending Fatigue Testing: The method specifies procedures for rotating bending fatigue tests, applicable to round fine wires with diameters typically up to 1.60 mm (0.063 in.).
- Test Types: It details both non-guided and guided rotating bending fatigue test setups, allowing the selection of the most appropriate system depending on strain levels, material properties, and test objectives.
- Measurement and Detection: Fatigue cycles are counted until wire fracture occurs, utilizing electrical, optical, or laser fracture detection systems.
- Environmental Control: Emphasizes the need for temperature stability through fluid immersion or environmental chambers to prevent adiabatic heating, particularly during high-frequency testing.
- Reporting and Precision: The methodology requires documentation of test configuration, specimen geometry, environmental conditions, cycles to failure, and statistical fatigue data, in line with ASTM guidance on precision and repeatability.
- Limitations: The test method is ideally suited for cases where surface strain dominates fatigue life. It may not capture subsurface-initiated cracks typical in uniaxial high-cycle fatigue.
Applications
- Production Quality Control: Helps wire manufacturers monitor process consistency and material quality by quickly generating fatigue life data for statistical process control.
- Material Acceptance: Used by engineers and purchasers to verify that wire products meet required fatigue strength criteria for end-use applications.
- Materials Design and Research: Supports research into the effects of internal material structure, inclusions, melt techniques, or cold working on fatigue performance.
- Service Life Prediction: Provides valuable input for predicting the durability and maintenance intervals of wire components in practical applications, such as medical devices, springs, cables, and electronic contacts.
Common industries and applications include:
- Medical Device Manufacturing (e.g., surgical wires and implants)
- Automotive and Aerospace Engineering
- Electrical and Electronic Components
- Precision Instrumentation
Related Standards
Several ASTM documents complement or are referenced by ASTM E2948-22, enhancing the robustness and applicability of fatigue testing procedures:
- ASTM E468: Practice for Presentation of Constant Amplitude Fatigue Test Results for Metallic Materials
- ASTM E177: Practice for Use of the Terms Precision and Bias in ASTM Test Methods
- ASTM E691: Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- ASTM E739: Practice for Statistical Analysis of Linear or Linearized Stress-Life (S–N) and Strain-Life (ε–N) Fatigue Data
- ASTM F562: Specification for Wrought 35Cobalt-35Nickel-20Chromium-10Molybdenum Alloy for Surgical Implant Applications
- ASTM STP 566, 588, 731: Handbooks and guides for fatigue testing, statistical planning, and fatigue limit estimation
- ANSI B4.1: Standard Limits and Fits, especially for bushing clearance.
Practical Value
ASTM E2948-22 is an essential international standard that delivers a reliable rotating bending fatigue test method for fine round wires. Its consistent procedures, environmental controls, and clear reporting requirements equip manufacturers, designers, and quality engineers with actionable data to optimize material selection, production processes, and product performance. The standard enhances confidence in material durability and provides a scientific foundation for understanding and improving the fatigue life of metallic wire products.
Keywords: rotating bending fatigue, fine wire testing, fatigue strength, ASTM E2948-22, metallic wire durability, material acceptance, production control, guided fatigue testing, statistical fatigue analysis.
Технические детали
- Технический комитет
- E08 - Fatigue and Fracture
- SKU
- ASTM E2948-22
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