Determination of concrete fracture parameters using inverse analysis: Influence of the tensile softening model

Determination of concrete fracture parameters using inverse analysis: Influence of the tensile softening model

Paper in proceedings (conference paper)

The paper is focused on the identification of selected mechanical fracture parameters of concrete. An inverse analysis based on an artificial neural network is used for this purpose. In this approach the laboratory measurements are matched with the results gained by reproducing the same test numerically. The identification of mechanical fracture parameters is carried out from the records of three-point bending and wedge-splitting tests performed using three specimen sizes. The ATENA software is employed for the numerical simulation of the fracture tests. The material model with the exponential and bilinear tensile softening law is selected to govern the gradual evolution of localized damage. The obtained parameters are finally analyzed and discussed in terms of their dependence on the size of the initial uncracked ligament. The results show that both tensile softening models are able to capture the behavior of the specimens in the softening phase reasonably well. The tensile softening model does not affect the modulus of elasticity values but has a slight effect on the tensile strength and fracture energy. For the latter two parameters, both models detected the influence of specimen size on their values.

The paper is focused on the identification of selected mechanical fracture parameters of concrete. An inverse analysis based on an artificial neural network is used for this purpose. In this approach the laboratory measurements are matched with the results gained by reproducing the same test numerically. The identification of mechanical fracture parameters is carried out from the records of three-point bending and wedge-splitting tests performed using three specimen sizes. The ATENA software is employed for the numerical simulation of the fracture tests. The material model with the exponential and bilinear tensile softening law is selected to govern the gradual evolution of localized damage. The obtained parameters are finally analyzed and discussed in terms of their dependence on the size of the initial uncracked ligament. The results show that both tensile softening models are able to capture the behavior of the specimens in the softening phase reasonably well. The tensile softening model does not affect the modulus of elasticity values but has a slight effect on the tensile strength and fracture energy. For the latter two parameters, both models detected the influence of specimen size on their values.

Inverse analysis, mechanical fracture parameters, numerical simulation, size effect, exponential and tensile softening model

Inverse analysis, mechanical fracture parameters, numerical simulation, size effect, exponential and tensile softening model

ŠOMODÍKOVÁ, M.; LIPOWCZAN, M.; LEHKÝ, D.

2024

13.01.2023

Elsevier

Procedia Structural Integrity

Materials Structure & Micromechanicas of Fracture

2452-3216

Procedia Structural Integrity

43

1

Kingdom of the Netherlands

258

263

6

https://www.sciencedirect.com/science/article/pii/S2452321622008319

http://hdl.handle.net/11012/213711

1-s2.0-S2452321622008319-main