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Stochastic cracking of composites with micromechanical formulation of crack bridges



Title: Stochastic cracking of composites with micromechanical formulation of crack bridges
Author(s): R. Rypl, R. Chudoba, M. Vořechovský and J. Hegger
Paper category : conference
Book title: 2nd International RILEM Conference on Strain Hardening Cementitious Composites (SHCC2-Rio)
Editor(s): R.D. Toledo Filho, F.A. Silva, E.A.B. Koenders and E.M.R. Fairbairn
ISBN: 978-2-35158-120-9
e-ISBN: 978-2-35158-121-6
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 269 - 276
Total Pages: 8
Nb references: 9
Language: English


Abstract: Brittle-matrix composites (BMC) loaded in tension exhibit strain hardening behavior. A number of simplified analytical models has been developed in the past to effectively capture the fragmentation process of BMC starting from the elastic range, over the gradual evolution of matrix cracks up to the point of the saturated crack density and/or the failure of the weakest crack bridge.
In the present paper the model formulation is decomposed into two parts: On the microscopic scale the debonding problem is solved a-priori for a single representative crack bridge including local effects in the material structure (short fiber orientation, irregular penetration by the matrix into a multifilament yarn structure, etc.). The crack-bridge model delivers a load dependent profile of the strain transferred between the reinforcement and the matrix that is further included in the fragmentation model of the composite. The mesoscopic simulation of the fragmentation process includes a numerical integration which evaluates the overall strain and a simulation of random fields to reflect the varying tensile strength of the matrix.


Online publication: 2012-01-25
Publication type : full_text
Public price (Euros): 0.00