13th International Conference on Fracture June 16–21, 2013, Beijing, China -9- (a) (b) (c) (d) Figure 6. Verification for the mixed-mode specimen: (a) the Mode I and Mode II fracture toughness versus the crack extensions for AM1; (b) the total fracture toughness versus the crack extension curves for AM1; (c) the Mode I and Mode II fracture toughness versus the crack extensions for AM5; and (d) the total fracture toughness versus the crack extension curves for AM5. 5. Summary and Conclusions The proposed CMOD-based hybrid method relies on a single experimental P-Δ curve and multiple numerical P-Δ curves to derive the fracture resistance curve for both the SE(B) specimen and the mixed-mode I and II specimen. The CMOD-based hybrid method simplifies the J-R curve testing procedure by eliminating the multiple unloading and reloading sequences, required to determine the specimen compliance and hence the crack size. The current CMOD-based hybrid method removes the dependence on the LLD, which requires careful instrumentation to prevent possible errors introduced by the indentation at the loading point. The close agreement between the J-R curves derived from the CMOD-based hybrid approach and those determined from the tests validates the proposed hybrid approach for both the SE(B) specimens and the mixed-mode I and II specimens. References [1] American Society for Testing and Materials, Standard test method for measurement of fracture toughness. ASTM E1820-11. West Conshohocken, PA, United States, 2011. [2] International Standard Organization. Metallic Materials-Unified Method of Test for the
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