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Simulation of mechanical tests on SHCC by fem with stochastic fields

Title: Simulation of mechanical tests on SHCC by fem with stochastic fields
Author(s): M. Přinosil and P. Kabele
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: 61 - 68
Total Pages: 8
Nb references: 4
Language: English

Abstract: Tensile behavior of fiber reinforced strain hardening cementitious composites (SHCC) is usually characterized by means of direct tensile or bending tests. However, characteristics obtained from these tests are largely influenced by the particular setup of the experiments, such as size of specimen, boundary conditions, method of specimen preparation (casting, sawing), etc. In our previous work [1], we demonstrated that these phenomena can be qualitatively reproduced by the finite element method (FEM) with stochastic fields representing the composite’s inhomogeneous mesostructure. In the present work we perform a parametric study to investigate the effects of selected parameters of the numerical model on the SHCC characteristics obtained in virtual tensile tests. The essence of these effects is discussed. Optimum parameters giving the best fit to experimental results for a particular specimen series are chosen. However, it is found that when these parameters are used to predict response of specimens produced and stored at different conditions, the computed tensile strain capacity may not match that obtained experimentally. This is attributed to different mesostructure of the specimens used for calibration and those whose response was predicted. It is finally concluded that stochastic FEM should be used with care if quantitative prediction of tensile behavior of SHCC is sought. On the other hand, with parameters calibrated against result of a physical experiment, the method provides a very useful insight into the SHCC tensile behavior.

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

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