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Journal Articles

Observation of initiation and propagation crack of perforated plate at elevated temperature

Bubphachopt, B.*; Watanabe, Osamu*; Kawasaki, Nobuchika; Kasahara, Naoto

Nihon Kikai Gakkai 2007-Nendo Nenji Taikai Koen Rombunshu, Vol.1, p.689 - 690, 2007/09

This study reports the real-time observation results on fatigue phenomena of the perforated plate and the half circular- hole notched plate made of SUS 304 stainless steel at elevated temperature. The crack initiates on the surface from the hole-side in the thickness direction and the crack initiates from the mid-surface along the thickness direction. After the crack initiation, it propagates and coalesces to fail finally. The number of micro or mini crack is summarized as a function of applied cyclic number.

Journal Articles

Creep-fatigue strength evaluation of perforated plate at elevated temperature using stress redistribution locus method

Bubphachopt, B.*; Watanabe, Osamu*; Kawasaki, Nobuchika; Kasahara, Naoto

Proceedings of 2007 ASME Pressure Vessels and Piping Division Conference/8th International Conference on Creep and Fatigue at Elevated Temperatures (PVP 2007/CREEP-8) (CD-ROM), 9 Pages, 2007/07

This study investigates the effects of creep behavior on fatigue strength of the perforated plate at elevated temperature, when SRL (Stress Redistribution Locus) method is applied for the perforated plate. The creep-fatigue test is carried out by using the specimens made of SUS304 stainless steel at the temperature of 550$$^{circ}$$C. The trapezoidal wave having tensile hold time at peak strain is assumed. The geometry of the perforated plate specimens are changed in the same manner of the fatigue test by number of holes and diameter size of the hole. The linear damage rule for fatigue and creep is assumed, and the comparison between the experimental results and SRL method evaluation at the Coffin diagram will be made. Both of the load and displacement are measured in all the cyclic history of the loadings to clarify the relation between crack initiation/propagation and the load decrease from the direct observation of crack at the holes side.

Journal Articles

Fatigue strength evaluation of perforated plate at elevated temperature using stress redistribution locus method

Watanabe, Osamu*; Bubphachopt, B.*; Kawasaki, Nobuchika; Kasahara, Naoto

Proceedings of 2007 ASME Pressure Vessels and Piping Division Conference/8th International Conference on Creep and Fatigue at Elevated Temperatures (PVP 2007/CREEP-8) (CD-ROM), 9 Pages, 2007/07

This study reports the effects of geometry on fatigue strength of the perforated plate at elevated temperature when SRL (Stress Redistribution Locus) Method is applied for the perforated plate with stress concentration. The test specimens made of SUS304 stainless steel are carried out by keeping temperature to be 550$$^{circ}$$C. The geometry of the perforated plate specimens are changed systematically by the number of holes and diameter size of the hole, where one or two holes are placed along the width direction, and the diameter is set to be from 2 mm to 8 mm. Both of the load and displacement are measured in all the cyclic history of the loadings to study the relation between crack initiation/propagation and the load decrease from the direct observation of crack at the holes side.

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