Using AE Signals to Investigate the Fracture Process in an Al-Ti Laminate.

Grzegorz Świt,Sebastian Lipiec,Ihor Dzioba,Tadeusz Pała,Aleksandra Krampikowska

doi:10.3390/ma13132909

Abstract

The paper describes tests conducted to identify the mechanisms occurring during the fracture of single-edge notches loaded in three-point bending (SENB) specimens made from an Al–Ti laminate. The experimental tests were complemented with microstructural analyses of the specimens’ fracture surfaces and an in-depth analysis of acoustic emission (AE) signals. The paper presents the application of the AE method to identify fracture processes in the layered Al–Ti composite using a non-hierarchical method for clustering AE signals (k-means) and analyses using waveform time domain, waveform time domain (autocorrelation), fast Fourier transform (FFT Real) and waveform continuous wavelet based on the Morlet wavelet. These analyses made it possible to identify different fracture mechanisms in Al–Ti composites which is very significant to the assessment of the safety of structures made of this material.

Highlights

Design requirements imposed on contemporary structural members frequently make it necessary to use materials that combine different strengths and mechanical properties
Signals indicates certain peculiarities of the fracture process in Al–Ti laminate specimens tested at two temperatures: T1 = 20 ◦ C and T2 = −50 ◦ C (Figure 2)
This paper presents a comprehensive study of the fracture process in an Al–Ti laminate prepared by explosion welding

Summary

Introduction

Design requirements imposed on contemporary structural members frequently make it necessary to use materials that combine different strengths and mechanical properties. Examples of such materials include composites, laminates, which may consist of several layers of materials with different strengths and mechanical properties, selected depending on the specific needs of the user. Various techniques and technologies are used during production to join different metallic materials in the laminates—adhesive bonding, high-temperature welding, friction welding [1,2,3,4] and, increasingly, explosion welding [5,6,7,8,9]. The least investigated and, at the same time, very important area, which frequently determines the strength

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Conclusion