An In Situ Impact Dynamics Instrument With Synchronous Identification of Optical and Acoustic Signals

The accurate determination of failure thresholds and real-time identification of failure modes of materials during impact remain major challenges. The current lack of scientific instruments that can integrate multiple in situ monitoring functions limits the ability to reveal material structural changes under impact conditions. In this article, a novel in situ impact dynamics instrument with synchronous identification of optical and acoustic signals was proposed. Through the integration of high-speed imaging, acoustic emission detection, and dynamic force measurement technologies, the real-time synchronous identification of the optical-acoustic-force signals of materials was realized during the impact process, which involved high-resolution, high-speed imaging, and nondestructive testing functions. Therefore, the evolution laws of material properties, transient mechanical behavior, and deformation damage mechanisms under impact conditions could be effectively investigated based on the proposed instrument. Furthermore, through impact tests of unnotched, U-notched, and V-notched 6061-T6 aluminum alloy specimens, the ability of the instrument to identify the optical-acoustic-force signals in real time and simultaneously obtain the impact dynamics performance under impact conditions is verified.