13th International Conference on Fracture June 16–21, 2013, Beijing, China -2- 2. The CMOD-Based Hybrid Approach The fundamental principle underlying the hybrid numerical and experimental approach remains similar to that of the conventional, multiple-specimen experimental approach proposed by Begley and Landes [6]. The procedure in the CMOD-hybrid approach follows similarly the hybrid approach, which relies on the P-LLD relations, proposed by the authors [7, 8], as illustrated in Figure 1. The numerical analyses of the hybrid approach generate a series of P-Δ curves from large-deformation, elastic-plastic analyses of multiple FE specimens with the same geometry, dimension and material, but different crack sizes. The experimental part of the hybrid approach produces the P-Δ curve for a fracture specimen with a growing crack. (a) (b) (c) Figure 1. Schematic description for the proposed CMOD-based hybrid approach to determine the ductile fracture resistance. Figure 1a illustrates the P-Δ curve obtained from the experimental specimen with the initial crack depth of a0 and those obtained from the FE models with crack sizes ranging from a1 to an. The intersection point between the experimental P-Δ curve and the numerical P-Δ curve defines a common loading and CMOD level in the FE specimen with a stationary crack and the experimental specimen with a growing crack. The crack extension (Δai ) in the experimental specimen assumes a
RkJQdWJsaXNoZXIy MjM0NDE=