Design Procedures of Composite Structures via Fuzzy Set Approach

SUMARY: The variability of properties in composite materials and structures is an origin of a scatter in failure loads. In the present paper we propose a non-stochastic description of uncertainity effects that allows us to evaluate lower and upper bounds of failure loads understood in the sense of buckling, FPF and delaminations. The vertex method is introduced and discussed herein to evaluate failure loads in a numerical manner. Then, we demonstrate the results of fatigue tension and four-pont bending tests being the introduction for buliding Fuzzy Knowledge Base. Some experimental results dealing with the acoustic emission analysis of fatigue tests are also shown here.