SEDL / STP / STP821-EB / STP34449S

Computer-Controlled Fatigue Crack Growth Rate Testing on Bend Bars in a Corrosive Environment

Fabis, TR
Research Engineer (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), Laboratory Supervisor (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), and Manager (Metallurgy Department), Westinghouse R&D Center, Pittsburgh, Pa.

Liaw, PK
Research Engineer (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), Laboratory Supervisor (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), and Manager (Metallurgy Department), Westinghouse R&D Center, Pittsburgh, Pa.

Ceschini, LJ
Research Engineer (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), Laboratory Supervisor (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), and Manager (Metallurgy Department), Westinghouse R&D Center, Pittsburgh, Pa.

Leax, TR
Research Engineer (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), Laboratory Supervisor (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), and Manager (Metallurgy Department), Westinghouse R&D Center, Pittsburgh, Pa.

Landes, JD
Research Engineer (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), Laboratory Supervisor (Materials Testing & Evaluation Department), Senior Engineer (Metallurgy Department), and Manager (Metallurgy Department), Westinghouse R&D Center, Pittsburgh, Pa.

Pages: 14    Published: Jan 1984

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Abstract

Automated fatigue crack growth experiments were conducted on a 304 stainless steel in air and wet hydrogen at 654 kPa. The tests were performed using three-point bend specimens in the frequency range from 0.1 to 10 Hz.

Results show that the fatigue crack propagation rate in the hydrogen gas environment can increase with decreasing frequency. For ΔK-values higher than 22 MPam, the crack growth rate data in wet hydrogen at 10 Hz are 40% higher than those encountered in the ambient environment. The crack growth rates developed in the constant ΔK tests are in good agreement with those in the decreasing and increasing ΔK tests in both air and wet hydrogen environments.