Estimation of Fracture Toughness J_IC by Miniature Specimen Hydraulic Bulge Test

Abstract:

The fracture toughness tests and a new miniature specimen technology named hydraulic bulge test (HBT) of 3Cr1Mo1/4V at four service time were carried out. Four J-R resistance curves by single-specimen method with one inch CT specimens were obtained to compute the J_IC. Different definitions of equivalent fracture strain according to the section morphologies of HBT testing specimens were compared, and fracture energy of miniature specimens with three different thicknesses (0.4mm, 0.5mm and 0.6mm) were also calculated. Results showed that the typical HBT load-deflection curve can be divided into four sections like SPT curve. Equivalent fracture strain and fracture energy E_HB can be chosen as two fracture parameters for the HBT specimen. Ductile fracture toughness J_IC can be related approximately linearly to both the equivalent fracture strain and fracture energy E_HB.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 753-757
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.753
• Online since: June 2017
• Authors: Le Le Gui*, Tong Xu, Bin An Shou, Han Kui Wang, Jing Xiang
• Keywords: Equivalent Fracture Strain, Fracture Energy, Fracture Toughness, Hydraulic Bulge, Miniature Specimen

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