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boundary-value test

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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
... to estimate K Ic values. Roberts and Newton have written an excellent review of the subject ( Ref 31 ). The National Academy of Sciences has also published a review of a variety of techniques for estimating K Ic values from tensile, bend, and Charpy tests ( Ref 32 ). Because the objective here is to provide...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490059
EISBN: 978-1-62708-340-9
... transgranular fracture. In creep tests in which one or more of the recovery and softening processes become important, all three of the reactions described above determine together the shape of the creep curve. In addition, grain-boundary sliding and intercrystalline fracture may also begin to contribute...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
... words, at low temperatures, the grain boundaries are usually stronger than the grains themselves, while at high temperatures, the grains are stronger than the grain boundaries. An example of an intergranular fracture is shown in Fig. 15.12 for Inconel 751 that was stress-rupture tested at 730 °C (1350...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090001
EISBN: 978-1-62708-266-2
... when tested at a strain rate of 10 −6 in 1 N sulfuric acid (H 2 SO 4 ). On the other hand, in a test under similar conditions, rapid intergranular SCC resulted in nickel in which phosphorus was segregated to the grain boundaries. Using crack-tip chemistry modeling, it was shown that intergranular...
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Published: 01 October 2021
Fig. 7 (a) Schematic illustration of a grain boundary. (b) Hall-Petch data for Fe. Closed points are Vickers and nanoindentation hardness values divided by the Tabor factor of 3, while open points are yield strengths measured using compression or tension tests. The red dotted line is the best More
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
... tests are similar to the Charpy V-notch test. Only the geometry of the machined notch is different. However, since the notch is not as severe, the keyhole and U-notch tests generally yield higher values of toughness and lower transition temperatures. They are more appropriate when testing materials...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
... curve (point C in Fig. 2.1 ). The magnitude of strain at point D is an arbitrary amount of permanent strain that is considered admissible for general purposes. The value of this strain is 0.002, which is universally adopted by material testing engineers, and is known as the 0.2% offset...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060083
EISBN: 978-1-62708-343-0
... than some minimum cut-off value, the FEA could be repeated while incorporating the amount of inelasticity that had been measured in the uniaxial test. A few iterations may be necessary for purposes of accurately performing the partitioning process. Obtaining viable input information...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060049
EISBN: 978-1-62708-261-7
... strength determination requires a specimen that has been loaded to its 0.2% offset yield strength and unloaded so that it is 0.2% longer than before the test. The offset yield strength is often referred to in Great Britain as the proof stress, where offset values are either 0.1 or 0.5%. The yield strength...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230209
EISBN: 978-1-62708-298-3
...) mode and screw mode, respectively. The three modes are illustrated in Fig. 17.21 . Calculation of critical flaw sizes for beryllium yields values between 0.2 and 1 mm [ Pinto 1979b ]. Depending on the type of test, the value may refer either to the radius, the length, or half-length of the flaw...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060115
EISBN: 978-1-62708-355-3
... higher value of Young’s modulus, an iron component will deflect less than an “identical” copper or aluminum component that undergoes an equivalent load. In a tensile test, for example, the elastic tensile strains in 12.8 mm (0.505 in.) diam tensile bars of iron, copper, and aluminum loaded to 455 kg...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... occupies the major portion of the duration of the creep test, and the strain rate in this region for many creep-resistant materials is sufficiently constant to be considered as a steady-state creep rate. For these materials, the minimum creep rate is a steady-state value that can be empirically related...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040247
EISBN: 978-1-62708-300-3
... between the grain-boundary energy and the pinning effects of precipitates (precipitate size and spacing) is reached. Grain growth is characterized by compression tests with different postforging hold times. From the micrographs obtained from these tests, the microstructural evolution from partial...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060043
EISBN: 978-1-62708-343-0
... value. Final fracture, for materials subject to grain-boundary sliding, is frequently intercrystalline, and it occurs after relatively few cycles, compared to the other ways of imposing the same strain range. Fig. 3.2 Schematic illustration of creep-fatigue interaction when tensile creep...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030126
EISBN: 978-1-62708-282-2
... (0.004 in.) resulted in nickel in which sulfur was segregated to the grain boundary when tested at a strain rate of 10 −6 s −1 in 1 N sulfuric acid (H 2 SO 4 ). On the other hand, rapid intergranular SCC resulted in nickel in which phosphorus was segregated to the grain boundaries that was tested...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140039
EISBN: 978-1-62708-264-8
... hardness ranges of steels. See Ref 5.1 and 5.2 for further discussion of hardness testing. Table 5.3 presents information (adapted from ASTM standard E 140) listing HRC values measured on steel and the corresponding equivalent hardnesses of various other tests for steel. Remember...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... creep curves creep fatigue creep rupture testing creep strain cyclic loading deformation maps grain-boundary cracking CREEP is time-dependent deformation that occurs at high temperature relative to the melting point of metallic materials. The creep regime for metals is commonly regarded...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860269
EISBN: 978-1-62708-348-5
... / ∂ a Figure 8.2 Crack growth resistance curve and crack driving force curves in R -curve format ( McCabe and Heyer, 1973 ). K R and K are computed for the test specimen and structure, respectively, using the appropriate value of Y ( a + r y ) in Eq. 8.6 . In applying the R -curve...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090191
EISBN: 978-1-62708-266-2
... on the water side, and multiple branching cracks were observed. In contrast, only ductile, transgranular cracking was observed in post-irradiation mechanical tests performed in inert environments and at various temperatures and strain rates. Grain-boundary carbide precipitation was not observed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850410
EISBN: 978-1-62708-260-0
... field measurement. After each of these 20 values has been calculated, they are summed, yielding 947.2. This value is divided by N - 1, i.e., 19, and then the square root is taken to obtain a value of 7.06 for s . If the test data exhibit a normal distribution about the mean, plus or minus one...