Document Type : Original Article
Authors
1
Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
2
1- Faculty Member, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
3
aerospace eng. Mechanic's department, Tarbiatmodares university, Tehran, Iran
10.22034/ijme.2023.418015.1840
Abstract
Nowadays, sandwich panels are used as light load-bearing structures in most aerospace structures and other industries. Smooth and uniform surfaces, excellent resistance to fatigue, low weight, and good energy absorption are the characteristics of honeycomb panels. In this article, to investigate the energy absorption and strength of sandwich panels with composite skin and the use of an elastomer layer as a layer between the composite skin and aluminum honeycomb core 5052 under quasi-static punch loading, using two mandrels with flat and spherical cross-section. The experimental form has been discussed. The failure modes in this test include wrinkling of the skin, separation of the adhesive layer between the plate and the core, tearing of the plate, crushing of the core of the sandwich panel outside the plate, bending of the core of the sandwich panel inside the plate, rupture of the core of the sandwich panel are classified. By examining the experimental results of the mandrel penetration test, it was determined that the strength and energy absorption of the sandwich panel increased by 20% using the elastomer layer, and the cohesion and adhesion of the skin of the sandwich panel to the core was greatly improved. Using the elastomer layer, in the three-point bending test, the displacement of the sample increased by 8.7 times until reaching the breaking force of the structure.
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