Article ID Journal Published Year Pages File Type
770277 Engineering Fracture Mechanics 2014 22 Pages PDF
Abstract

•A new local crack propagation algorithm is developed to reduce mesh-induced directional bias.•The algorithm determines smooth curved crack paths within and across conventional continuum elements.•Furthermore, the algorithm includes the possibility to postpone the moment of crack path fixation.•Combined with a classical fixed smeared crack model a significant increase of mesh objectivity is obtained.•Specifically, quadratic elements show mesh independence and good agreement with experimental results.

This work presents a new local crack tracking technique to improve numerical simulations of localized fracture processes in quasi-brittle structures. The algorithm primarily focuses on reduction of mesh-induced directional bias by the determination of smoothly curved C1C1 – continuous crack paths within and across conventional continuum elements with quadratic displacement fields. The algorithm further enables to postpone the moment of crack path fixation.Combined with a classical smeared crack model, the proposed crack propagation algorithm is validated by sequentially linear analyses on tensile and mixed-mode plain concrete fracture tests. Specifically for quadratic elements the results show an increase of the mesh objectivity, and more realistic load–displacement and cracking behaviors are obtained.

Related Topics
Physical Sciences and Engineering Engineering Mechanical Engineering
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