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E1761-95 - Standard Guide for Recommended Formats for Data Records Used in Computerization of Fatigue and Fracture Data of Metals

This guide covers recommended formats for the recording of fatigue and fracture test data for inclusion in computerized material property databases. From this information, the database designer should be able to construct the data dictionary preparatory to developing a database schema. Not covered within the scope of this guide are guidelines for the identification of the materials themselves, or descriptions of the materials, or both. Those guidelines are covered in separate standards, such as Guides E1338 and E1339.

 

E1681-03 Standard Test Method for Determining a Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials

This test method covers the determination of the environment-assisted cracking threshold stress intensity factor parameters, KIEAC and KEAC, for metallic materials from constant-load testing of fatigue precracked beam or compact fracture specimens.

 

E1457-00 Standard Test Method for Measurement of Creep Crack Growth Rates in Metals

This test method covers the determination of creep crack growth rates in metals at elevated temperature using compact type, C(T), (see Fig. 1) specimens subjected to static or quasi-static loading conditions. The time rate of crack growth, a(t) or da/dt is expressed in terms of the magnitude of crack growth rate relating parameters, C*(t), Ct or K.

 

E1304-97 - Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials

This test method covers the determination of plane-strain (chevron-notch) fracture toughnesses, KIv or K IvM, of metallic materials. Fracture toughness by this method is relative to a slowly advancing steady state crack initiated at a chevron-shaped notch, and propagating in a chevron-shaped ligament (Fig. 1). Some metallic materials, when tested by this method, exhibit a sporadic crack growth in which the crack front remains nearly stationary until a critical load is reached. The crack then becomes unstable and suddenly advances at high speed to the next arrest point. For these materials, this test method covers the determination of the plane-strain fracture toughness, KIvj or KIvM, relative to the crack at the points of instability.

 

E1290-02e1 - Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement

This test method covers the determination of critical crack-tip opening displacement (CTOD) values at one or more of several crack extension events. These CTOD values can be used as measures of fracture toughness for metallic materials, and are especially appropriate to materials that exhibit a change from ductile to brittle behavior with decreasing temperature. This test method applies specifically to notched specimens sharpened by fatigue cracking. The recommended specimens are three-point bend [SE(B)] compact [C(T)], or arc-shaped bend [A(B)] specimens. The loading rate is slow and influences of environment (other than temperature) are not covered. The specimens are tested under crosshead or clip gage displacement controlled loading.

 

E1221-96 - Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels

This test method employs a side-grooved, crack-line-wedge-loaded specimen to obtain a rapid run-arrest segment of flat-tensile separation with a nearly straight crack front. This test method provides a static analysis determination of the stress intensity factor at a short time after crack arrest. The estimate is denoted K a. When certain size requirements are met, the test result provides an estimate, termed KIa, of the plane-strain crack-arrest toughness of the material.

 

E1049-85 - Standard Practices for Cycle Counting in Fatigue Analysis

These practices are a compilation of acceptable procedures for cycle-counting methods employed in fatigue analysis. This standard does not intend to recommend a particular method.

 

E740-03 Standard Practice for Fracture Testing with Surface-Crack Tension Specimens

This practice covers the design, preparation, and testing of surface-crack tension (SCT) specimens. It relates specifically to testing under continuously increasing force and excludes cyclic and sustained loadings. The quantity determined is the residual strength of a specimen having a semielliptical or circular-segment fatigue crack in one surface. This value depends on the crack dimensions and the specimen thickness as well as the characteristics of the material.

 

E739-91 - Standard Practice for Statistical Analysis of Linear or Linearized Stress-Life (S-N) and Strain-Life (?-N) Fatigue Data

This practice covers only S-N and ?-N relationships that may be reasonably approximated by a straight line (on appropriate coordinates) for a specific interval of stress or strain. It presents elementary procedures that presently reflect good practice in modeling and analysis. However, because the actual S-N or ?-N relationship is approximated by a straight line only within a specific interval of stress or strain, and because the actual fatigue life distribution is unknown, it is not recommended that (a) the S-N or ?-N curve be extrapolated outside the interval of testing, or (b) the fatigue life at a specific stress or strain amplitude be estimated below approximately the fifth percentile (P ≅ 0.05). As alternative fatigue models and statistical analyses are continually being developed, later revisions of this practice may subsequently present analyses that permit more complete interpretation of S-N and ?-N data.

 

E647-00 Standard Test Method for Measurement of Fatigue Crack Growth Rates

This test method covers the determination of fatigue crack growth rates from near-threshold to Kmax controlled instability. Results are expressed in terms of the crack-tip stress-intensity factor range ( K), defined by the theory of linear elasticity.

 

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