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Acta Armamentarii ›› 2023, Vol. 44 ›› Issue (12): 3783-3792.doi: 10.12382/bgxb.2023.0349

Special Issue: 爆炸冲击与先进防护

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Design of Layered Metal Embedded Stress Sensing Structure and Testing of Microstructure and Properties in Ultrasonic Additive Manufacturing

WANG Yu, BAI Shule, WANG Ziqi, LIU Bin*(), FENG Li, ZHAO Wenjuan, HAO Junhui   

  1. School of Materials Science and Engineering, North University of China, Taiyuan 030051, Shanxi, China
  • Received:2023-04-18 Online:2023-12-30
  • Contact: LIU Bin

Abstract:

A diaphragm type layered metal embedded stress sensing structure is proposed to address the issues of low accuracy and difficulty in detecting the internal stresses in metal structures using traditional patch testing. Material selection and structural design are carried out from aspects of the thickness of diaphragm layer and the material of diaphragm. Ultrasonic additive manufacturing is used to manufacture Cu/Al layered diaphragm structures. The mutual diffusion, phase composition, and microstructure of the diaphragm/substrate interface after ultrasonic consolidation are studied. Finite element impact simulation is used to simulate the strain of traditional patch structures and the layered embedded stress sensing structures obtained from manufacturing, Strain testing is conducted on layered embedded stress sensing structures to investigate the strain response effect of layered metal embedded stress sensing structures. The research results indicate that the shape of diaphragm designed by the diaphragm layer is a circular membrane, of which the film material is a pure copper with a film diameter of 20mm and a film thickness of 0.1mm. After ultrasonic additive manufacturing of Cu film/Al matrix, a small amount of Cu atoms diffuse towards the Al layer without generating new intermetallic compounds, forming a mechanically bonded toothed morphology. The results of impact simulation and strain testing both indicate that the strain response effect of the embedded stress sensing structure is more accurate than that of the traditional patch structure.

Key words: structural design, ultrasonic additive manufacturing, interface research, impact simulation

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