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Research Papers: Materials and Fabrication

Crack Initiation Process for Semicircular Notched Plate in Fatigue Test at Elevated Temperature

[+] Author and Article Information
Bopit Bubphachot

 Mahasarakham University, Klantaravichai, Mahasarakham 44150, Thailandbopit.b@msu.ac.th

Osamu Watanabe1

 University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japanwatanabe@kz.tsukuba.ac.jp

Nobuchika Kawasaki

 Japan Atomic Energy Agency, Oarai, Ibaraki 311-1393, Japankawasaki.nobuchika@jaea.go.jp

Naoto Kasahara

 University of Tokyo, Hongo, Tokyo 113-8656, Japankasahara@n.t.u-tokyo.ac.jp

1

Corresponding author.

J. Pressure Vessel Technol 133(3), 031403 (Apr 04, 2011) (8 pages) doi:10.1115/1.4002539 History: Received September 14, 2009; Revised September 05, 2010; Published April 04, 2011; Online April 04, 2011

Crack initiation and propagation process of fatigue test in semicircular notched plates at elevated temperature were conducted under strain-controlled condition in order to study the crack initiation/propagation/coalescence process and load decrease in structure having stress concentration. Test specimens made of SUS304 stainless steel are tested at 550°C and the geometry of the semicircular notched plate specimens are changed by diameter size of the circular notch in both of single-notched specimens and double-notched specimens. Photographs in all cycles were recorded to investigate crack initiation/propagation/coalescence as a function of number of applied cycle. The typical crack process is predicted by using the simplified method, namely, stress redistribution locus method as well as Neuber’s formula.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Geometry and dimension of test specimens (mm)

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Figure 2

Experimental setup for flange-type specimen

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Figure 3

Photographed directions for crack Initiation and propagation

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Figure 4

History of tensile load of D1 model

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Figure 5

Crack on curved surface for D1-2 model

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Figure 6

Crack on curved surface for D1-4 model

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Figure 7

Crack on curved surface for D1-6 model

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Figure 8

Measurement of number of crack as a function of cycle number for D1-4 model

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Figure 9

History of number of occurred crack for D1-4 model and definitions of typical cycle number

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Figure 10

History of load and crack number versus cycle number

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Figure 11

Normalized history of load and crack number versus cycle number

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Figure 12

Crack on curved surface and crack tip of D2-4 model from both of width and thickness directions

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Figure 13

Opening angle of crack occurrence on curved surface at failure cycle Nf

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Figure 14

Comparison between the measured CCD observation cycle number NIII and the predicted cycle Nc from load-cycle curve (0.3% and 0.5% strain amplitude)

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Figure 15

Comparison between the measured CCD observation Nc′ and the predicted cycle Nc from load-cycle curve (0.3% and 0.5% strain amplitude)

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Figure 16

Comparison between the measured CCD observation cycle number NIII and the cycle number of crack run to the edge Nc′ (0.3% and 0.5% strain amplitude)

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Figure 17

Strain estimated by SRL method

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Figure 18

Fatigue test of strain and failure cycle relation by SRL method with reduction factor κ=1.6

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Figure 19

Effects of reduction factor of Neuber’s law

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