Dariusz Kurpisz
Poznan University of Technology, Poland
Title: The modeling of selected mechanical properties of plastic materials under influence of complex external load state
Biography
Biography: Dariusz Kurpisz
Abstract
One of the most important and widely used materials are plastic materials. Hence, the knowledge on the behaviour and especially mechanical properties of this type of materials, plays an important role in their strength assessment. Very important is here the practical possibility of the prediction of material behaviour under the influence of complex load state, where useful and very important are the strain energy based methods of mechanical properties modelling of material. Such type of approach to the modelling were used among others in [4] and [5].
In the current paper basing on phenomenological approach and interpretation of mechanical experimental characteristics, the strain energy model of plastic material under complex load state in range of elastic deformations, will be introduced. The strain energy density function which is a density of the work of stress components for along deformation path , defined in the form: will be applied for determination of material stability assumption due to the possibility of the appearing of plastic flow.
All theoretical investigations will be illustrated on the example of two types of plastics materials in three-axial state of stress.