Research of Fiberglass Destruction Process by Acoustic Emission Method

Abstract

The task of this paper is a study of fiberglass structural defects accumulation and destruction process kinetics under load in conditions of uniaxial tension by analyzing the parameters of acoustic emission signals. The fiberglass type Etal T-210 T11 GVS9 was selected as a test material samples of which were made in the vacuum-compression impregnation apparatus. Test samples were performed under conditions of uniaxial stretching. Simultaneously with a load chart recording continuous recording of acoustic emission signals was conducted. Control the following parameters of acoustic emission signals were performed: peak amplitude of the signals, a total count of the signals, a counting rate and a total energy of the signals. It was found that at different stages of fiberglass loading the different events are clearly distinguished, identification of which is uniquely performed by analyzing the parameters of acoustic emission signals. The accumulation of defects and failure of fiberglass under load is a complex multistage process the main stages which are micro plastic shifts in the matrix, cracking in the matrix, a break adhesive bonds between the matrix and the reinforcing element, the gap of separate filler pieces of formation, and ultimately, the main crack fracture leading to loss of integrity of the sample material. The method of uniaxial stretching of structural polymeric materials in combination with the method of acoustic emission can be efficiently used to study deformation and fracture processes, as well as to establish limiting characteristics for different classes of materials.