Microstructure Tensor Approach to the Inherent Anisotropic Behavior of Concrete in First-Mode Fracture Parameters: An Experimental Study

This study investigates the impact of concrete anisotropy on fracture parameters and mechanical behavior using three-point bending tests (TPBTS) on notched beam specimens oriented at ۰°, ۲۲.۵°, ۴۵°, ۶۷.۵°, and ۹۰°. Key parameters, including tensile strength (ft), fracture toughness (Kic), and fracture energy (GF), are evaluated using the boundary effect method (BEM) and the work of fracture method (WFM). The findings demonstrate that anisotropy significantly impacts the fracture parameters, with specimens cut at inclined angles exhibiting inferior mechanical properties compared to those cut at ۰° and ۹۰°. The lowest tensile strength occurs at ۲۲.۵°, while the minimum fracture energy is observed at ۴۵°. A concrete strength model incorporating microstructure tensors for anisotropic failure is proposed. This research aims to improve predictive models and design guidelines for structures by highlighting the importance of considering material orientation in experiments.

کلیدواژه ها:

Concrete Anisotropy ، Fracture Parameters ، Predictive Model