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crack-trajectory
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Mixed mode fracture in reinforced concrete with low volume fraction of steel fibers
, Article International Journal of Engineering, Transactions B: Applications ; Volume 24, Issue 1 , February , 2011 , Pages 1-18 ; 1728-144X (ISSN) ; Zakeri, I ; Shahvari, F. V ; Sharif University of Technology
Materials and Energy Research Center
2011
Abstract
An investigation into the mixed mode fracture of steel fiber reinforced concrete (SFRC) beams with one percent volume fraction of steel fiber is presented. A series of notched beams with different notch depths and locations are tested under three-point bending. The test results for apparent fracture toughness, crack trajectories, and fracture energy are presented. The crack paths for SFRC and plain concrete beams are compared. The apparent fracture toughness values were more scattered for SFRC than for plain concrete. The load-deflection curves were used to obtain the fracture energy. To this end, two methods were utilized for center notched beams, and the results were comparable to each...
Phase field approach for nanoscale interactions between crack propagation and phase transformation
, Article Nanoscale ; Volume 11, Issue 46 , 2019 , Pages 22243-22247 ; 20403364 (ISSN) ; Levitas, V. I ; Farrahi, G. H ; Javanbakht, M ; Sharif University of Technology
Royal Society of Chemistry
2019
Abstract
The phase field approach (PFA) for the interaction of fracture and martensitic phase transformation (PT) is developed, which includes the change in surface energy during PT and the effect of unexplored scale parameters proportional to the ratio of the widths of the crack surface and the phase interface, both at the nanometer scale. The variation of these two parameters causes unexpected qualitative and quantitative effects: shift of PT away from the crack tip, "wetting" of the crack surface by martensite, change in the structure and geometry of the transformed region, crack trajectory, and process of interfacial damage evolution, as well as transformation toughening. The results suggest...