The effect of manufacture process on material properties of laminated composite cylinders using non-destructive technique

¹ Institute of Materials and Structures, Riga Technical University, Kipsalas Street, 6A, LV-1048 Riga, Latvia
² Institute of Mechanics for Materials, University of Latvia, Aizkraukles Street, 23, LV-1006, Riga, Latvia
³ D un D Centrs, Ziemelu Street, 23, LV-1021, Riga, Latvia

^* Corresponding author: andrejs.kovalovs@rtu.lv

Abstract

This paper presents a comparative investigation of the effect of hand lay-up to manufacture of composite structure on the elastic constants of composite cylindrical shells. Non-destructive technique for detection of elastic constants in laminated composite cylinders were applied. This technique based on numerical-experimental method that included experimental testing and numerical modelling. Experimental testing includes determination of natural frequencies in composite cylinders fixed at the ends. Composite construction fixed by upper end on the special test bench to realize clamped-free boundary conditions. 48 piezo sensors were glued on the outer surface of composite shells to measure strains during testing. Data received during experiments were converted in modal parameters using ARTEMIS software. By minimizing the error functional between the numerical and experimental data of the natural frequencies, the properties of laminated composite materials were obtained. It can be seen that elastic constants of the five composite shells have insignificant differences in values and be successfully applied for numerical calculation in further.