Dynamic crack mechanism model place in the designing of the buildings

¹ Milton Friedman University, 1039 Budapest, Kelta str. 2., Hungary
² Óbuda University, Bánki Donát Faculty of Mechanical and Safety Engineering, 1081 Budapest Népszínház str. 8, Hungary

^* Corresponding author: nyikes.zoltan@uni-milton.hu

Abstract

The materials that we use always have some defects. Under static, cycling or dynamic load the materials as a function of the crack size and load environment can initiate a fracture. The crack mechanism depends on several factors, like material properties, crack type and the stress kind. The traditional fracture mechanics theories suggest several solutions to predict the crack-grow and the fracture. The fracture mechanism theories are well known in the case of the elastic-plastic behaviour materials and also for the brittle materials under different strain like a high cycle and low cycle fatigue load. These theories are supported by test results. Several researchers evaluated different test methods for determining the fracture toughness on the base of crack-grow behaviour by dynamic tests and determining dynamic fracture toughness. The paper brings the results of the brick blast resistance under the blast load. Damage level was detected as a function of the test setup parameters. The bricks were pre-cracked before the test. The results show that the fracture can be guided by the pre-cracking and decrease the blast affected damage.