Author(s):
1. Aleksandar Radaković, State University of Novi Pazar, Serbia
2. Dragan Milosavljevic, Faculty of Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Srbija 2IMW Ins, Serbia
3. Gordana Bogdanovic, Faculty of Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Srbija 2IMW Ins, Serbia
4. Ljiljana Veljović, Faculty of Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Srbija 2IMW Ins, Serbia
5. Srbislav Aleksandrovic, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia

Abstract:
ABSTRACT. Second-order failure criteria in stress field are recommended for the analysis of unidirectional and multidirectional composite materials. Such an approach is easy to use because the coefficients of failure criteria represent the components of stress tensors. Equations and introduced transformations can be successfully used. The combination of experimental results and numerical results obtained in the software package Matlab proved to be very productive. As known five out of six components of strength tensor necessary for defining failure criteria are easy to determine, while the sixth component is very difficult to determine. The criteria of boundary behavior of the material, based on tensor-polynomial functional, differ in the manner of determining the interaction components of strength tensor. Numerical results have considerably contributed in this respect, because, based on the obtained characteristics of the material, the envelope that was created defines the allowed stress in the laminate. In the present paper receiving the failure envelopes takes into consideration the influence of shear stress according to number of authors. The laminate is modeled by first-order deformation theory. The paper observes the possibility of failure in each laminate layer for various loading values and ratio of shear stress to shear strength of the material.

Key words:
Second-order failure criteria,Failure envelope,Shear stress,Laminates,Stress tensor

Date of abstract submission:
16.02.2013.

Conference:
DEMI 2013