Current evaluation procedures for toughness measurements, such as the J-integral and the crack tip opening displacement (CTOD), focus primarily on single-specimen estimation schemes which essentially relate the plastic contribution to the strain energy with J based upon a plastic η-factor. This work addresses the significance of the η-factor on estimation procedures for J in pin-loaded and clamped single edge notch tension (SE(T)) specimens using load-displacement records. Very detailed non-linear finite element analyses for plane-strain models provide the evolution of load with increased load-line displacement and crack mouth opening displacement to define the applied load as a separable function dependent upon crack geometry and material deformation. The analyses reveal that η-factors based on load-line displacement (LLD) are very sensitive to plasticity changes at locations remote from the crack-tip region. In contrast, η-factors based on crack mouth opening displacement (CMOD) appear less affected by remote crack-tip plasticity. Overall, the present results provide a strong support to use η-based procedures in toughness measurements for clamped SE(T) fracture specimens.
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ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
July 18–22, 2010
Bellevue, Washington, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-49255
PROCEEDINGS PAPER
Significance of the Plastic Eta Factor in J Estimation Procedures for Tensile SE(T) Fracture Specimens Available to Purchase
Henrique S. S. Carvalho,
Henrique S. S. Carvalho
University of Sa˜o Paulo, Sa˜o Paulo, SP, Brazil
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Claudio Ruggieri
Claudio Ruggieri
University of Sa˜o Paulo, Sa˜o Paulo, SP, Brazil
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Henrique S. S. Carvalho
University of Sa˜o Paulo, Sa˜o Paulo, SP, Brazil
Claudio Ruggieri
University of Sa˜o Paulo, Sa˜o Paulo, SP, Brazil
Paper No:
PVP2010-25031, pp. 991-1000; 10 pages
Published Online:
January 10, 2011
Citation
Carvalho, HSS, & Ruggieri, C. "Significance of the Plastic Eta Factor in J Estimation Procedures for Tensile SE(T) Fracture Specimens." Proceedings of the ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B. Bellevue, Washington, USA. July 18–22, 2010. pp. 991-1000. ASME. https://doi.org/10.1115/PVP2010-25031
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