SYMPOSIA PAPER Published: 01 January 1974
STP33131S

Fracture Under Combined Modes in 4340 Steel

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An experimental investigation was conducted to study the inter- action of combined modes of loading on crack instability in the presence of the opening and sliding modes of stress intensity factors (KI and KII), the opening and tearing modes of stress intensity factors (KI and KIII), and all three modes of stress intensity factors (KI, KII, and KIII). Through-cracked and surface-cracked flat and round specimens, and round notched bar specimens fabricated from high strength 4340 steel were used for the investigation. The results are evaluated to determine fracture criteria under the combined modes of KI and KII, KI and KIII and KI, KII, and KIII for the 4340 steel. These results are compared with the results of other investigators obtained for different materials. For the combined Mode I-II tests, it was found that the presence of KII can have a significant effect on KI at which fracture occurs and vice versa. For the combined Mode I-III tests, it was found that the application of KIII up to about 70 percent of KIIIc has little effect on KI at which fracture occurs. Similarly, the application of KI up to about 70 percent of KIc has little effect on KIII at which failure occurs.

Author Information

Shah, RC
Research and Engineering Division, Boeing Aerospace Company, Seattle, Wash.
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Details
Developed by Committee: E08
Pages: 29–52
DOI: 10.1520/STP33131S
ISBN-EB: 978-0-8031-4645-7
ISBN-13: 978-0-8031-0361-0