University of Tabriz Journal of Civil and Environmental Engineering 2008-7918 42 66 2012 05 21 Estimating Fracture Eenergy of Concrete Using Artificial Neural Networks Estimating Fracture Eenergy of Concrete Using Artificial Neural Networks 1 8 3426 FA Hasan Afshin Faculty of Civil Engineering, Sahand University of Technology N. Ali Choupani Faculty of Mechanical Engineering, Sahand University of Technology Hadi Fathipour Azar Mining Engineering, Sahand University of Technology Journal Article 2015 04 26 Artificial neural networks (ANNs) Fracture mechanics Concrete https://ceej.tabrizu.ac.ir/article_3426_b6051f16dd0d21dc43f989c633106b1b.pdf