Modelling of Discrete Crack Propagation

2009 ◽  
Author(s):  
P.O. Bouchard ◽  
F. Bay ◽  
Y. Chastel ◽  
J.L. Chenot ◽  
I. Tovena
Keyword(s):  
Crack Propagation ◽  
Discrete Crack

Computer Simulation of Discrete Crack Propagation

2003 ◽  
Vol 14 (1) ◽  
pp. 9-22 ◽  
Author(s):  
Ioannis Mastorakos, ◽  
Lazaros K. Gallos, ◽  
Elias C. Aifantis,
Keyword(s):  
Computer Simulation ◽  
Crack Propagation ◽  
Discrete Crack

Finite element analysis of intermediate crack debonding in fibre reinforced polymer strengthened reinforced concrete beams

2018 ◽  
Vol 45 (10) ◽  
pp. 840-851 ◽  
Author(s):  
Michael Cohen ◽  
Agostino Monteleone ◽  
Stanislav Potapenko
Keyword(s):  
Reinforced Concrete ◽  
Crack Propagation ◽  
Damage Mechanics ◽  
Rate Of Change ◽  
Reinforced Concrete Beams ◽  
Element Analysis ◽  
Reinforced Polymer ◽  
Discrete Crack ◽  
External Reinforcement ◽  
Fibre Reinforced Polymer

The performance of the fibre reinforced polymer (FRP) to reinforced concrete (RC) interface is vital to ensure desired design capacity. Without proper understanding of the interfacial behaviour it is impossible to develop an effective, efficient, and rational bonding technique. This paper presents the results of a comprehensive numerical investigation aimed to assess and better understand the debonding behaviour caused by different types of intermediate flexural crack distributions in FRP–RC strengthened beams. The model is based on damage mechanics modelling of concrete, a bilinear bond–slip relationship with softening to represent the interface, and a discrete crack approach to simulate crack propagation. The model also highlights how crack propagation and debonding is affected by the rate of change of moment. It is shown that the variation of crack spacing and rate of change of moment can significantly affect debonding crack propagation and strain development in the internal and external reinforcement, which directly influences debonding load.

Numerical Modelling and Analysis of Ductile Crack Propagation in Blanking Process Using Modified Nodal Release Method

2007 ◽  
Vol 344 ◽  
pp. 201-208
Author(s):  
Bernd Arno Behrens ◽  
Kanwar Bir Sidhu
Keyword(s):  
Crack Propagation ◽  
Crack Extension ◽  
Crack Tip ◽  
Slight Modification ◽  
Ductile Crack ◽  
Crack Trajectory ◽  
Fine Mesh ◽  
Discrete Crack ◽  
Release Method ◽  
Blanking Process

Ductile fracture processes for discrete crack propagation using nodal release approach is well established for modelling crack in metal sheet. In this method, the crack is assumed to initiate or propagate along the element edges; hence, a new crack is implemented in the FE mesh. In Blanking process, the crack trajectory is unknown; therefore a very fine mesh is required to simulate a realistic crack propagation using the nodal release method. Consequently, the nodal release method has to be modified in which first the direction of crack extension is calculated and then, accordingly, the local element topology near the crack-tip is modified such that the nodes of elements are moved to predicted crack-tip in order to accommodate the crack extension. The advantage of this method is that it is possible to model the predicted crack with only slight modification in the local mesh near to the crack tip. However, it is necessary to transfer history variables from old local elements of previous increment to the new local elements of the current increment at the vicinity of crack-tip. But this method can lead to slight loss of accuracy to predict the subsequent crack extension due to interpolations. However, the advantage of this method is that remeshing can be either completely eliminated or reduced to a greater extend during the simulation. Therefore, in this paper, modified nodal release method for modelling ductile crack propagation in blanking process with the uncoupled damage approach is presented, and is further implemented in commercial FE software - MSC.Marc® together with predefined user-subroutines

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