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precracked specimen testing

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Published: 01 January 2017
Fig. 17.25 Classification of precracked specimens for SCC testing. Asterisks denote commonly used configurations. Source: Ref 17.26 More
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Published: 01 August 1999
Fig. 17 Crack propagation rates in stress-corrosion tests using precracked specimens of high-strength 2 xxx series aluminum alloys, 25 mm thick, double antilever beam, T-L (S-L) orientation of plate, wet twice a day with an aqueous solution of 3.5% NaCl, 23 °C. Source: Ref 13 More
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Published: 01 August 1999
Fig. 21 Classification of precracked specimens for SCC testing. Asterisks denote commonly used configurations. Source: W, depth of specimen, a , depth of notch plus crack. Source: Ref 19 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090367
EISBN: 978-1-62708-266-2
... strain, plastic strain, and residual stress responses. It also describes the difference between smooth and precracked specimens and how they are used, provides information on slow-strain-rate testing and how to assess the results, and discusses various test environments and procedures, including tests...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870219
EISBN: 978-1-62708-299-0
... 47) and ferrous alloys. It sets forth the environmental conditions of the test and the means for controlling them. This practice applies only to tests in which the specimens are accessible to the surrounding air under conditions that permit drying. It does not cover tests in which specimens...
Image
Published: 01 January 2017
Fig. 17.38 Effects of beam deflection rate on stress-corrosion crack velocity in precracked cantilever bend specimens of a carbon-manganese steel. Tested in a carbonate-bicarbonate solution at 75 °C (165 °F) and at a potential of −650 mV (SCE). Source: Ref 17.58 More
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Published: 01 July 1997
Fig. 13 Macrograph of the fracture surface of a crack tip opening displacement test specimen removed from the 1.07 m (42 in.) X-65 steel pipe. The regions of the surface shown correspond with the notch, precrack, stable crack growth, fast fracture, and overload zones. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090443
EISBN: 978-1-62708-266-2
... practice for making and using precracked double beam stress corrosion specimens. Specific Environments ASTM G142: Test method for determination of susceptibility of metals to embrittlement in hydrogen containing environments at high pressure, high temperature or both. ASTM G35: Practice...
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Published: 01 December 2015
Fig. 2 Stress-corrosion cracking (SCC) defect tolerance parameter ( K ISCC /σ y ), where K ISCC is the threshold SCC intensity factor and σ y is yield stress versus hardness for carbon steel weldments in three environments. Data are derived from published tests on precracked specimens More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.9781627082662
EISBN: 978-1-62708-266-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780211
EISBN: 978-1-62708-281-5
... a desired, stable crack growth extension, Δ a , and is then unloaded. Polymer specimens are then removed from the test frame and fractured in liquid nitrogen. (This last step deviates from ASTM E 1737, which specifies that the specimens be fatigued first.) The precrack, stable crack growth and freeze...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930163
EISBN: 978-1-62708-359-1
... are in the preparation of the test specimen and precracking. Three positions of the notch tip are specified: the weld metal, the fusion line, and the HAZ. Three orientations of the notch tip are allowed. One of the important areas in the preparation of the test specimen is the fatigue precracking. The crack path...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610101
EISBN: 978-1-62708-303-4
.... 18 . The most common Charpy test uses a V-notched specimen. Three others are the Charpy keyhole test, Charpy U-notch test, and the precracked Charpy test. The Charpy keyhole and U-notch tests are similar to the Charpy V-notch test. Only the geometry of the machined notch is different. However...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870099
EISBN: 978-1-62708-299-0
..., which has had over 30 years of experience in military aircraft with no record of SCC problems. Typical data on 2 xxx alloys are shown in Fig. 17 . Fig. 17 Crack propagation rates in stress-corrosion tests using precracked specimens of high-strength 2 xxx series aluminum alloys, 25 mm thick...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860269
EISBN: 978-1-62708-348-5
... ASTM E 399 compact specimen for fracture toughness testing. The specimens are precracked by fatigue cycling to an initial relative crack length of a / W ≃ 0.5. Precracking loads are limited to low values to keep the plastic zone size at the crack tip small; the fatigue loads must...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540169
EISBN: 978-1-62708-309-6
... on the basis of solid mechanics, but must be obtained experimentally. It is not yet clear just how complex a property C is. In order to obtain C experimentally, it is first necessary to obtain a mathematics expression for , in terms of crack dimensions, geometry of the test specimen, modulus...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240221
EISBN: 978-1-62708-251-8
... transition criteria. Source: Ref 6 Several variations on the basic Charpy test specimen are shown in Fig. 13.10 . The most common Charpy test uses a V-notched specimen. Three others are the Charpy keyhole test, Charpy U-notch test, and the precracked Charpy test. The Charpy keyhole and U-notch...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090095
EISBN: 978-1-62708-266-2
... specimens ( Ref 4.83 ) and precracked fracture mechanics specimens ( Ref 4.27 ). In the fracture mechanics tests ( Ref 4.27 ), the ferritic grades Remanit 4522 and Remanit 4575 were fully resistant to chloride SCC at stress-intensity levels of 60 MPa m ( 55  ksi in . ) in 22% NaCl...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090043
EISBN: 978-1-62708-266-2
... hydrogen demonstrates how hydrogen, regardless of the source, can cause the embrittlement. In general, increased pressure will promote embrittlement by gaseous hydrogen ( Ref 2.90 , 2.91 ). This effect is evident for precracked steels and is sometimes not observed in tests using smooth specimens ( Ref...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490021
EISBN: 978-1-62708-340-9
... with the crack is unloaded. For a test specimen, the crack is introduced by fatiguing at a low ΔK level. As the crack undergoes loading, the following sequence of events takes place: (1) sharp precracking is present; (2) blunting of the initial crack occurs; (3) blunting increases with increasing load; (4) crack...