The Simulation of Flood and Relaxation Using Burgers Visco-Elastic Model

The ideal viscous-elastic continuous medium presents both elastic and viscous properties which can be pointed out using flood and relaxation experiments. The flood is the phenomenon of slow, progressive viscous-elastic medium deformations, when the test-piece is submitted to a constant load, which cause a tensile stress in the material. In the first moment an instant elastic strain under the action of this load, then a plastic strain occurs, which in time tends to a limit value called delayed strain. The phenomenon of relaxation of force means the progressive decrease of the load applied to the test-piece, respectively, the tensile stress, after the specific strain occured in the test-piece, keeping the strain constant. The present paper presents the results of flood and relaxation simulation using BURGERS visco-elastic model, which were both analitical obtained and using the simulation medium MATLAB SIMULINK