Mixed-mode I/III fracture toughness of a ferritic/martensitic stainless steel

Conference · Fri Oct 01 00:00:00 EDT 1993

OSTI ID:10162586

Li, Huaxin ^[1]; Jones, R H; Gelles, D S ^[2]; Hirth, J P ^[3]

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1. Associated Western Univ., Richland, WA (United States)
2. Pacific Northwest Lab., Richland, WA (United States)
3. Washington State Univ., Pullman, WA (United States)

The critical J-integrals of mode I (J{sub IC}), mixed-mode I/III (J{sub MC}), and mode III (J{sub IIIC}) were examined for a ferritic stainless steel (F-82H) at ambient temperature. A determination of J{sub MC} was made using modified compact-tension specimens. Different ratios of tension/shear stress were achieved by varying the principal axis of the crack plane between 0 and 55 degrees from the load line. Results showed that J{sub MC} and tearing modulus (T{sub M}) values varied with the crack angles and were lower than their mode I and mode III counterparts. Both the minimum J{sub MC} and T{sub M} values occurred at a crack angle between 40 and 50 degrees, where the load ratio of {sigma}{sub i}/{sigma}{sub iii} was 1.2 to 0.84. The J{sub min} was 240 Kj/M{sup 2}, and ratios of J{sub IC}/J{sub min} and J{sub IIIC}/J{sub min} were 2.1 and 1.9, respectively. The morphology of fracture surfaces was consistent with the change of J{sub MC} and T{sub M} values. While the upper shelf-fracture toughness of F-82H depends on loading mode, the J{sub min} remains very high. Other important considerations include the effect of mixed-mode loading on the DBT temperature, and effects of hydrogen and irradiation on J{sub min}.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 10162586
• Report Number(s): PNL-SA-22493; CONF-931009-27; ON: DE94014492
• Resource Relation: Conference: Fall meeting of the Minerals, Metals and Materials Society: physical metallurgy and materials,Pittsburgh, PA (United States),17-21 Oct 1993; Other Information: PBD: Oct 1993
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
STAINLESS STEELS
FRACTURE PROPERTIES
CRACKS
360103
MECHANICAL PROPERTIES