... is a semi-analytical methodology based on the load separation approach and uses load-line displacement (LLD) for single edge notched bend (SENB) specimens or compact tension (CT) specimens. This method has been extensively utilized to develop J-R curves using SENB and CT specimens for various steels...

... Fracture resistance of ductile materials is often characterized by a J-R curve, and measured using the fracture toughness testing standard ASTM E1820 (Standard Test Method for Measurement of Fracture Toughness). The recommended elastic unloading compliance method or resistance curve test...

.... Fracture toughness J-R curve tearing instability segregation Zr-2.5%Nb pressure tube Journal of ASTM International, Vol. 5, No. 7 Paper ID JAI101132 Available online at www.astm.org K. Kapoor,1 N. Saibaba,1 B. P. Kashyap,2 and A. V. Ramana Rao1 Tearing Crack Growth and Fracture Micro-Mechanisms...

... Single specimen J-R curve testing for X80 pipeline steel was conducted using single edge notched bend (SENB) and single edge notched tension (SENT) specimens with various crack lengths. Test data indicate that the J-R curves for this steel are strongly constraint dependent. To facilitate...

... obtained clearly show that MC(T) samples exhibit lower fracture toughness properties, both in terms of initiation of ductile tearing (according to various test standards) and resistance to ductile crack propagation (J-R curve). The reduction of tearing resistance might be attributed to work hardening...

... in nitrogen UHMWPE were exposed to an accelerated oxidative challenge in the laboratory. The tensile mechanical properties and crack growth resistance curves (J-R curves) determined for oxidative aged melt-annealed highly crosslinked UHMWPE were either equivalent or superior to the oxidative aged conventional...

... Typical ASTM fracture testing determines the J -integral resistance ( J-R ) curve or fracture toughness ( J IC ) based on specimens with high-constraint geometry such as those specified in ASTM E 1737-96. A three-term asymptotic solution with two parameters, J and A 2 (a constraint...

... In this paper a mechanistic rationale for the fracture process is applied to the CVN impact test so that the J-R curve fracture toughness could be estimated for materials that have only a CVN energy value as the fracture toughness characterization. The method assumes that the fit to the J-R...

... For integrity assessment of reactor vessels it is desirable to obtain elastic-plastic fracture mechanics properties of the vessel material and evaluate how such properties evolve during operation. The J-R curve provides a direct evaluation of these properties. As surveillance capsules normally...

... and could be the mechanisms that contributed to the cyclic degradation. In addition to the laboratory tests, finite element analyses were performed on a cyclic C(T) specimen to verify the ASTM E 1152 procedure used and to calculate the cyclic J-R curves. fracture toughness cyclic effects ductile...

... different welded systems were constructed with the mismatch ranging between -36% to +47% and various weld joint profiles to sculpt fusion zone widths between 2 and 13 mm at the crack tip. Instrumented tension tests were utilized to characterize weldment strength behavior, while single-edge bend J-R curve...

... A prototype alternating-current potential drop (ACPD) measurement technique has been developed for quasistatic and dynamic J-R curve testing. This well-known technique has classically been used in fatigue crack growth testing, but may find its niche in dynamic testing of conducting materials...

... of ductile tearing, and an accurate expression of the material J-R curve, determined from fractography. The model provides a rationale for the different fracture behaviour of a material over the whole range of temperature, from fully stable J-R behaviour at high temperature down to brittle fracture under...

... Two new experimental approaches are presented in this study to develop J-R curves: (1) from displacement versus crack length without load measurement and (2) from displacement alone without load and crack length measurement. The approaches are new applications of the method of normalization...

... This study examined the effect of specimen size on J-R curves for reactor pressure vessel (RPV) steels. Overall comparisons for monolithic materials (base plate and forging) indicated that no significant size effect is apparent, using standard formulations for the J -integral within commonly...

... Recent J-R curve testing of A302-B plate has shown significant specimen size effects. If the J-R curves of a material are dependent on size and the larger the size, the lower the J-R curve, serious questions as to the usability of J-R curve information from nuclear reactor pressure...

... The method of normalization is used in a new inverse way to develop J-R curves from test records that contain only load-versus-crack length values with no measure of displacement. These data may represent a special case where measurement of crack length is easier experimentally than...

... In this paper the impact of recent changes in ASTM Test Method for J Ic , a Measure of Fracture Toughness (E 813) are evaluated. J Ic was determined from a large number of J-R curves using both the 1981 and the 1987 versions of ASTM E 813. The value of J Ic is usually from 10 to 15...

... The method of normalization has been used to develop J-R curves for metallic materials based only on analysis of load and displacement pairs in a ductile fracture test record. This method eliminates the need for crack length monitoring equipment. It not only provides a method for more easily...

... deflection was observed. The decrease in J Q was comparable to that observed previously in uniformly prestrained specimens. elastic-plastic fracture test methods J-R curve residual stress steels prestrained specimens Andrea D. Gallant, 1 Isa Bar-On, ~ and.Floyd R. Tuler ~ Effect...