ASTM E606/E606M-12
Standard Test Method for Strain-Controlled Fatigue Testing

Standard No.
ASTM E606/E606M-12
Release Date
2012
Published By
American Society for Testing and Materials (ASTM)
Status
Replace By
ASTM E606/E606M-19
Latest
ASTM E606/E606M-21
Scope

Strain-controlled fatigue is a phenomenon that is influenced by the same variables that influence force-controlled fatigue. The nature of strain-controlled fatigue imposes distinctive requirements on fatigue testing methods. In particular, cyclic total strain should be measured and cyclic plastic strain should be determined. Furthermore, either of these strains typically is used to establish cyclic limits; total strain usually is controlled throughout the cycle. The uniqueness of this test method and the results it yields are the determination of cyclic stresses and strains at any time during the tests. Differences in strain histories other than constant-amplitude alter fatigue life as compared with the constant amplitude results (for example, periodic overstrains and block or spectrum histories). Likewise, the presence of nonzero mean strains and varying environmental conditions may alter fatigue life as compared with the constant-amplitude, fully reversed fatigue tests. Care must be exercised in analyzing and interpreting data for such cases. In the case of variable amplitude or spectrum strain histories, cycle counting can be performed with Practice E1049 .

Strain-controlled fatigue can be an important consideration in the design of industrial products. It is important for situations in which components or portions of components undergo either mechanically or thermally induced cyclic plastic strains that cause failure within relatively few (that is, approximately <105) cycles. Information obtained from strain-controlled fatigue testing may be an important element in the establishment of design criteria to protect against component failure by fatigue.

Strain-controlled fatigue test results are useful in the areas of mechanical design as well as materials research and development, process and quality control, product performance, and failure analysis. Results of a strain-controlled fatigue test program may be used in the formulation of empirical relationships between the cyclic variables of stress, total strain, plastic strain, and fatigue life. They are commonly used in data correlations such as curves of cyclic stress or strain versus life and cyclic stress versus cyclic plastic strain obtained from hysteresis loops at some fraction (often half) of material life. Examination of the cyclic stress–strain curve and its comparison with monotonic stress–strain curves gives useful information regarding the cyclic stability of a material, for example, whether the values of hardness, yield strength, ultimate strength, strain-hardening exponent, and strength coefficient will increase, decrease, or remain unchanged (that is, whether a material will harden, soften, or be stable) because of cyclic plastic straining (1). The presence of time-dependent inelastic strains during elevated temperature testing provides the opportunity to study the effects of these strains on fatigue life and on the cyclic stress-strain response of the material. Information about strain rate effects, relaxation behavior, and creep also may be available from these tests. Results of the uniaxial tests on specimens of simple geometry can be applied to the design of components with notches or other complex shapes, provided that the strains can be determined and multiaxial states of stress or strain and their gradients are correctly correlated with the uniaxial strain data.

1.1 This test method covers the determination of fatigue properties of nominally homogeneous materials by the use of test specimens subjected to uniaxial forces. It is intended as a guide for fatigue testing performed in support of such activities as materials research and development, mechanical design, pro......

ASTM E606/E606M-12 Referenced Document

  • ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
  • ASTM E1012 Standard Practice for Verification of Specimen Alignment Under Tensile Loading
  • ASTM E1049 Standard Practices for Cycle Counting in Fatigue Analysis
  • ASTM E111 Standard Test Method for Young''s Modulus, Tangent Modulus, and Chord Modulus
  • ASTM E112 Standard Test Methods for Determining Average Grain Size
  • ASTM E1245 Standard Practice for Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic Image Analysis
  • ASTM E132 Standard Test Method for Poisson''s Ratio at Room Temperature
  • ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
  • ASTM E1823 Standard Terminology Relating to Fatigue and Fracture Testing
  • ASTM E209 Standard Practice for Compression Tests of Metallic Materials at Elevated Temperatures with Conventional or Rapid Heating Rates and Strain Rates
  • ASTM E3 Standard Practice for Preparation of Metallographic Specimens
  • ASTM E337 Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
  • ASTM E384 Standard Test Method for Microindentation Hardness of Materials
  • ASTM E399 Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials
  • ASTM E4 Standard Practices for Force Verification of Testing Machines
  • ASTM E466 Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials
  • ASTM E467 Standard Practice for Verification of Constant Amplitude Dynamic Forces in an Axial Fatigue Testing System
  • ASTM E468 Standard Practice for Presentation of Constant Amplitude Fatigue Test Results for Metallic Materials
  • ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
  • ASTM E739 Standard Practice for Statistical Analysis of Linear or Linearized Stress-Life (S-N) and Strain-Life (949;-N) Fatigue Data
  • ASTM E8/E8M Standard Test Methods for Tension Testing of Metallic Materials
  • ASTM E83 Standard Practice for Verification and Classification of Extensometer
  • ASTM E9 Standard Test Methods of Compression Testing of Metallic Materials at Room Temperature

ASTM E606/E606M-12 history

Standard Test Method for Strain-Controlled Fatigue Testing


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