Assessment of Geometry Independent Fracture Resistance Characteristics Based on Local Approach

Abstract:

The influences of stress triaxiality on ductile fracture have been emphasized to explain the geometry independent fracture resistance characteristics of specimens and structures during past two decades. For the estimation of this material behavior, two-parameter global approach and local approach can be used as case by case manner. Recently, the interests for the local approach and micro-mechanical damage model are increased again due to progress of computational environments. In this paper, the applicability of the local approach has been assessed through a series of finite element analyses incorporating both modified GTN model and Rousselier model. The ductile crack growth behaviors are examined to guarantee the transferability on different sizes and geometries of C(T) specimens and SE(T) specimens. The material fitting constants are determined from calibration of tensile tests and numerical analyses results, and used to simulate the fracture behaviors of typical specimens. Then, a comparison is drawn between the numerically estimated crack resistance curves and experimentally determined ones. The comparison results show a good agreement and the two damage models are regarded as promising solutions for ductile crack growth simulation.

• Periodical: Key Engineering Materials (Volumes 297-300)
• Pages: 2403-2409
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.297-300.2403
• Online since: November 2005
• Authors: Yoon Suk Chang, T.R. Lee, Jae Boong Choi, Young Jin Kim
• Keywords: Ductile Fracture, Fracture Resistance Curve, Local Approach, Micro-Mechanical Modeling

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