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striation spacings

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Published: 01 January 1987
Fig. 18 Relationship of fatigue striation spacings to their projected images. L T ′ : test line length; N: number of striations; ℓ t ; true striation spacing; ℓ means ′ : measured striation spacing in crack propagation direction. Primes indicate quantities More
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Published: 01 January 1987
Fig. 18 Local variations in striation spacing in a Ni-0.04C-21Cr-0.6Mn-2.5Ti-0.7Al alloy that was tested under rotating bending conditions. Compare with Fig. 17(b) . More
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Published: 01 January 1987
Fig. 25 Variations in fatigue striation spacing. (a) Spectrum-loaded fatigue fracture in a 7475-T7651 aluminum alloy test coupon showing an increase in striation spacing due to higher alternating stress. (b) Local variation in fatigue striation spacing in a spectrum-loaded 7050-T7651 aluminum More
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Published: 01 January 2002
Fig. 22 Geometric considerations for striation spacing measurements. L ′ T : test line length; N , number of striations; l t ; true striation spacing; l ′ meas measured striation spacing in crack propagation direction. Primes indicate quantities in projection More
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Published: 01 January 2002
Fig. 23 Correlation between striation spacing and fatigue life of permanent mold cast modified A356 aluminum alloy specimens tested at 0.5% strain amplitude More
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Published: 01 January 1996
Fig. 1 Correlation of fatigue striation spacing with Δ K normalized by Young's modulus ( E ) More
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Published: 01 January 1996
Fig. 11 Crack growth rate and striation spacing for an annealed iron tested in moist air. Source: Ref 72 More
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002352
EISBN: 978-1-62708-193-1
..., growth rates, and striation spacings of fatigue crack. The mechanisms of fatigue striation formation are also discussed. The fatigue crack growth in duplex microstructures and cyclic crack growth in polymers are reviewed. The article also describes the mechanisms and models of fatigue crack closure...
Series: ASM Handbook Archive
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001837
EISBN: 978-1-62708-181-8
... and surfaces. The applications of quantitative fractography for striation spacings, precision matching, and crack path tortuosity are also discussed. quantitative fractography scanning electron microscopes surface area surface roughness transmission electron microscopes THE PRINCIPAL OBJECTIVE...
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Published: 01 January 2024
Fig. 9 Fatigue failure of a Sikorsky S-61N helicopter pressurized rotor blade spar. (a) Details of the fatigue fracture surface indicating the phases of the spar fatigue life and the locations (arrows) of fractographs for striation spacing measurements. (b) Scanning electron microscope (SEM More
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Published: 15 January 2021
Fig. 32 Transmission electron fractograph of aluminum alloy laboratory spectrum loading fatigue test. Striation spacing varies according to loading, which consisted of ten cycles at a high stress alternating with ten cycles at a lower stress. The fracture surface exhibits bands of ten coarse More
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Published: 01 January 2002
Fig. 32 Transmission electron fractograph of aluminum alloy laboratory spectrum loading fatigue test. Striation spacing varies according to loading, which consisted of ten cycles at a high stress alternating with ten cycles at a lower stress. The fracture surface exhibits bands of ten coarse More
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Published: 01 January 1987
Fig. 625 TEM p-c replica of another area near C in Fig. 618 , showing a further increase in fatigue-striation spacing. A junction of two crack fronts is visible at lower right. Secondary cracks appear to have formed at some striations. 6500× More
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Published: 01 January 1987
Fig. 1050 Corrosion-fatigue fracture in a specimen of aluminum alloy 7075-T6 that, like the specimen in Fig. 1049 , was tested in a 3.5% NaCl solution while subjected to an applied electrical potential of −1.200 mV. Note the extremely large striation spacing; only two readily apparent More
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Published: 01 January 1987
Fig. 95 Changes in the principally fatigue-striated fracture appearance of a Ti-6Al-5Zr-0.5Mo-0.25Si alloy as a result of a 5-min dwell at maximum tensile stress. The changes included a local increase in the striation spacing after the dwell period (a); a change in the local fracture direction More
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Published: 01 January 2024
Fig. 8 Comparison of macroscopic fatigue crack growth rates and SEM-determined striation spacings for an aircraft aluminum alloy. STA, solution treated and aged. The data have been selected and replotted from Ref 42 . More
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Published: 01 January 2002
Fig. 46 Scanning electron micrographs of the fracture surfaces of Inconel 718 specimens tested at room temperature. (a) Δ K = 30 MPa m (27 ksi in. ), striation spacing ∼0.2 μm, and da / dN ∼ 0.1 μm/cycle. Arrow indicates direction of crack propagation. (b) Δ K = 14 MPa More
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Published: 01 January 1987
Fig. 97 Effect of one slow-fast cycle on the fracture appearance of an SUS 304 stainless steel that was fatigue tested in air at 600 °C (1110 °F). (a) Increase in fatigue striation spacing after the introduction of the slow-fast cycle at a half crack length = 0.97 mm (0.038 in.) (b More
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Published: 15 January 2021
Fig. 47 Scanning electron micrographs of the fracture surfaces of Inconel 718 specimens tested at room temperature. (a) Stress-intensity range (Δ K ) = 30 M P a m (27 ksi in .); striation spacing = ∼0.2 μm; and fatigue crack growth rate ( da / dN ) = ~0.1 μm/cycle. Arrow More
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 2024
DOI: 10.31399/asm.hb.v12.a0006848
EISBN: 978-1-62708-387-4
... correspondence between fatigue striations and cyclic load excursions, as demonstrated by Ryder ( Ref 19 ), is valid, there are some significant caveats: Striation spacings do not necessarily correspond to the macroscopic crack growth rates. At high growth rates, the striation spacings underestimate...