Study on the Influence of Embedded Sphere-Array on the Interface of Functional-Gradient Composite Plates Prepared Using Explosive Welding

doi:10.3901/JME.2025.24.075

Abstract

Abstract: Gradient composite plate structures have excellent synergistic advantages owing to their strength and toughness and have important application prospects in the fields of aerospace and national defense. The bonding interface performance is key to ensuring the mechanical properties of functional-gradient composite plates. In response to the demand for new functional structural materials, a technical approach for preparing functional-gradient composite plates with a sphere-array interlayer using explosive welding is explored. The static and dynamic parameters used in explosive welding process are within the welding window. The mechanism of wavy interface formation for a typical TA1/Q235 steel balls/Q235B functional-gradient composite plate is studied by combining experiment and numerical simulation methods. The fracture surfaces of the specimens, including the spheres, in the two types of mechanical tests exhibit ductile and quasi-cleavage fracturing. In impact toughness tests, the crack propagation direction extends directly towards the bonding interface in specimens with spheres protruding above the base plate; however, it extends perpendicularly through the interface and then into the flyer plate in specimens with non-protruding spheres. The experimental results and numerical simulation are in good agreement. A metallurgical bonding is formed on the top of the embedded spherical structure, and the middle and bottom of it are bonded by direct extrusion. The spherical structure protruding from the base plane hinders the bonding of the composite plate. In numerical simulation, the physical characteristics values of structure with spheres protruding at the interface after the spheres, such as collision velocity and pressure, are weaker than those of a structure with non-protruding spheres. The uneven plane aggravates the disturbance of the wavy interface, causing an increase in wavy amplitude and elongation of wavelength, and then a stable wavy interface will be re-formed.

Key words: explosive welding, sphere-array interlayer, mechanical properties, interface formation, numerical simulation

CLC Number:

TG156

CHEN Wei, HUANG Fenglei, ZENG Zhiheng, PI Aiguo. Study on the Influence of Embedded Sphere-Array on the Interface of Functional-Gradient Composite Plates Prepared Using Explosive Welding[J]. Journal of Mechanical Engineering, 2025, 61(24): 75-87.

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